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Siemens Simatic S7 Series Manual

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  • Page 1 Siemens Simatic S7 Manuals and Guides Presented By: Siemens Supply For Product Needs Please Visit: http://www.siemenssupply.com/ OR email: sales@siemenssupply.com OR call: 1-800-793-0630 Siemens S7 Manuals Siemens Supply www.siemenssupply.com...

  • Page 2: Table Of Contents

    Table of Contents Introduction................2 PLCs..................4 Number.Systems...............8 Terminology................2 Basic.Requirements..............8 S7-200.Micro.PLCs..............20 Programming.a.PLC..............33 Discrete.Inputs/Outputs............4 Analog.Inputs.and.Outputs............48 Timers..................5 Counters..................58 High-Speed.Instructions............6 Specialized.Expansion.Modules..........65 Review.Answers..............72 Final.Exam................74...

  • Page 3: Introduction

    Introduction Welcome.to.another.course.in.the.STEP.series,.Siemens. Technical.Education.Program,.designed.to.prepare.our. distributors.to.sell.Siemens.Industry,.Inc..products.more. effectively..This.course.covers.Basics of PLCs.and.related. products.. Upon.completion.of.Basics of PLCs.you.should.be.able.to: •. Identify.the.major.components.of.a.PLC.and.describe. their.functions •. Convert.numbers.from.decimal.to.binary,.BCD,.and. hexadecimal •. Identify.typical.discrete.and.analog.inputs.and.outputs •. Identify.key.differences.of.the.various.S7-200.models •. Identify.the.types.of.expansion.modules.available.for. S7-200.PLCs •. Describe.the.types.or.programming.available.for.S7-200. PLCs •. Describe.the.operation.of.commonly.used.program. functions.such.as.timers.and.counters •. Identify.the.proper.manual.to.refer.to.for.programming.or. installation.of.an.S7-200.PLC This.knowledge.will.help.you.better.understand.customer. applications..In.addition,.you.will.be.better.able.to.describe. products.to.customers.and.determine.important.differences. between.products..You.should.complete.Basics of Electricity before.attempting.Basics of PLCs..An.understanding.of.many.
  • Page 4 Siemens.is.a.trademark.of.Siemens.AG..Product.names. mentioned.may.be.trademarks.or.registered.trademarks.of.their. respective.companies..Specifications.subject.to.change.without. notice.

  • Page 5: Plcs

    PLCs A.programmable logic controller (PLC),.also.referred.to.as. a.programmable controller,.is.the.name.given.to.a.type.of. computer.commonly.used.in.commercial.and.industrial.control. applications..PLCs.differ.from.office.computers.in.the.types.of. tasks.that.they.perform.and.the.hardware.and.software.they. require.to.perform.these.tasks..While.the.specific.applications. vary.widely,.all.PLCs.monitor.inputs.and.other.variable.values,. make.decisions.based.on.a.stored.program,.and.control. outputs.to.automate.a.process.or.machine..This.course.is. meant.to.supply.you.with.basic.information.on.the.functions. and.configurations.of.PLCs.with.emphasis.on.the.S7-200.PLC. family.. Motor Indicator Light SF/DI AG Pump Pushbutton Sensor Basic PLC Operation. The.basic.elements.of.a.PLC.include.input modules.or points,. a.central processing unit (CPU),.output modules.or.points,. and.a.programming device..The.type.of.input.modules.or. points.used.by.a.PLC.depends.upon.the.types.of.input.devices. used..Some.input.modules.or.points.respond.to.digital.inputs,. also.called.discrete.inputs,.which.are.either.on.or.off..Other.
  • Page 6 The.CPU.evaluates.the.status.of.inputs,.outputs,.and.other. variables.as.it.executes.a.stored.program..The.CPU.then.sends. signals.to.update.the.status.of.outputs.. Output.modules.convert.control.signals.from.the.CPU.into. digital.or.analog.values.that.can.be.used.to.control.various. output.devices. The.programming.device.is.used.to.enter.or.change.the.PLC’s. program.or.to.monitor.or.change.stored.values..Once.entered,. the.program.and.associated.variables.are.stored.in.the.CPU. In.addition.to.these.basic.elements,.a.PLC.system.may.also. incorporate.an.operator.interface.device.to.simplify.monitoring. of.the.machine.or.process. Central Processing Unit Input Output (CPU) Module Module Programming Operator Device Interface In.the.simple.example.shown.below,.pushbuttons.(sensors). connected.to.PLC.inputs.are.used.to.start.and.stop.a.motor. connected.to.a.PLC.output.through.a.motor.starter.(actuator).. No.programming.device.or.operator.interface.are.shown.in.this. simple.example. Motor Motor Starter Output SF/D IAG Inputs Start Stop Pushbutton Pushbutton...
  • Page 7 24 VAC Start Stop Advantages of PLCs. PLCs.not.only.are.capable.of.performing.the.same.tasks.as. hard-wired.control,.but.are.also.capable.of.many.more.complex. applications..In.addition,.the.PLC.program.and.electronic. communication.lines.replace.much.of.the.interconnecting.wires. required.by.hard-wired.control..Therefore,.hard-wiring,.though. still.required.to.connect.field.devices,.is.less.intensive..This.also. makes.correcting.errors.and.modifying.the.application.easier.. Some.of.the.additional.advantages.of.PLCs.are.as.follows: •. Smaller.physical.size.than.hard-wire.solutions. •. Easier.and.faster.to.make.changes. •. PLCs.have.integrated.diagnostics.and.override.functions. •. Diagnostics.are.centrally.available. •. Applications.can.be.immediately.documented. •. Applications.can.be.duplicated.faster.and.less.expensively. Siemens Modular PLCs. Siemens.SIMATIC PLCs.are.the.foundation.upon.which.our. Totally Integrated Automation (TIA).concept.is.based.. Because.the.needs.of.end.users.and.machine.builders.vary. widely,.SIMATIC.PLCs.are.available.as.conventional.modular. controllers,.embedded.automation.products,.or.as.PC-based. controllers.
  • Page 8 Modular SIMATIC controllers.are.optimized.for.control.tasks. and.can.be.adapted.to.meet.application.requirements.using. plug-in.modules.for.input/output.(I/O),.special.functions,.and. communications..Examples.of.products.in.this.category.include:. LOGO!,.S7-200,.and.S7-200.micro.automation.products,. S7-300.and.S7-400.modular.system.PLCs,.C7.combination. controller.and.panel,.and.ET.200.distributed.I/O.system.with. local.intelligence. SIMATIC S7-1200 SF/DIAG SIMATIC S7-1200 SIMATIC S7-200 LOGO! SIMATIC S7-400 SIMATIC S7-300 Other SIMATIC Controllers SIMATIC embedded automation products.are.available.in. a.microbox,.panel.PC,.or.multi-functional.PC-based.system.. All.products.utilize.rugged,.fan-free,.diskless.hardware. platforms.with.an.operating.system.optimized.for.each. platform..Examples.of.products.in.this.category.include:. Microbox.420-RTX,.Microbox.420-T,.Panel.PC.477-HMI/RTX,.and. WinAC.MP . SIMATIC PC-based controllers.are.available.as.software.that. can.run.on.standard.PC.systems.or.in.a.plug-in.card.(slot.PLC). for.increased.reliability..This.category.includes.WinAC.software.

  • Page 9: Number.systems

    Number Systems Because.a.PLC.is.a.computer,.it.stores.information.in.the.form. of.on.or.off.conditions.(.or.0),.referred.to.as.bits..Sometimes. bits.are.used.individually.and.sometimes.they.are.used. to.represent.numerical.values..Understanding.how.these. bits.can.be.used.to.represent.numerical.values.requires.an. understanding.of.the.binary number system. Decimal System. In.order.to.understand.the.binary.number.system,.it.is. first.useful.to.recall.some.of.the.basics.of.the.decimal number system..All.number.systems.have.the.same.three. characteristics:.digits,.base,.weight..For.example,.the.decimal. system.has.the.following.characteristics: Ten.digits. 0,.,.2,.3,.4,.5,.6,.7 ,.8,.9 Base. Weights. Powers.of.base.0.(,.0,.00,.000,..) Binary System. The.binary system.has.the.following.characteristics: Two.digits:. 0,. Base. Weights. Powers.of.base.2.(,.2,.4,.8,.6,..) The.binary.system.has.a.base.of.2.and.uses.only.two. characters,..and.0..Each.bit.is.associated.with.a.power.of.2. based.on.its.position.in.the.number..The.further.to.the.left,. the.higher.the.power.of.2..The.number.in.the.far.left-hand. column.is.referred.to.as.the.most significant bit.or.MSB.and. the.number.in.the.far.right-hand.column.is.referred.to.as.the.
  • Page 10 The.process.of.converting.a.binary.number.to.an.equal.decimal. value.is.as.simple.as.adding.the.equivalent.decimal.value. for.each.position.in.the.binary.number.where.a..is.shown.. Positions.with.a.0.do.not.add.to.the.number.value.. Decimal Value = 32 + 8 + 1 = 41 Bits, Bytes, and Words. Each.position.in.a.binary.number.is.called.a bit..The.number. of.bits.used.to.represent.numbers.varies.with.the.device.. However,.instructions.and.data.are.usually.grouped.in.bytes.and. eight.bits.make.up.one.byte..Two.bytes,.or.6.bits,.make.up.one. word. Byte Word Logic 0, Logic 1. While.PLCs.are.capable.of.sensing.and.generating.analog. values,.programmable.controllers.internally.use.signals.that.are. on.or.off..These.on.and.off.conditions.correspond.to.the.binary. values..and.0..For.example,.a.binary.0,.also.called.logic.0,.can. be.used.to.indicate.that.a.switch.is.off,.and.a.binary..(logic.). can.be.used.to.indicate.that.a.switch.is.on. Input 1 Logic 0 24 VDC Input 1 Logic 1...
  • Page 11 BCD. While.it.is.necessary.for.PLCs.to.use.binary.values,.humans. often.need.to.see.values.represented.in.decimal..As.a.result,. some.input.and.output.devices.provide.a.decimal.display.where. each.decimal.digit.corresponds.to.four.PLC.binary.inputs.or. outputs..The.most.common.system.used.by.input.and.output. devices.of.this.type.is.referred.to.as.binary-coded decimal (BCD). One.example.of.a.BCD.device.is.a.type.of.four-digit. thumbwheel.switch..Each.thumbwheel.digit.controls.four. PLC.inputs..This.means.that.for.a.four-digit.thumbwheel,.6. inputs.are.required..Because.each.thumbwheel.digit.only. needs.to.represent.decimal.values.from.0.through.9,.only.ten. corresponding.binary.values.are.required.for.each.digit.. Decimal 0 0 0 0 0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 0 1 0 1 0 1 1 0 0 1 1 1 0000...
  • Page 12 Review 1. Identify.each.of.the.following.blocks.in.a.basic.PLC. system: b. ______________ a. ______ c. ______ d. _______ e. _______ 2.. The.base.of.the.binary.number.system.is.___.. 3.. The.base.of.the.hexadecimal.number.system.is.___. 4.. Convert.the.decimal.number.0.to.each.of.the.following. number.types: Binary. . ____________ BCD. ____________ Hexadecimal. ____________...

  • Page 13: Terminology

    Terminology Developing.an.understanding.of.PLCs.requires.learning. some.basic.terminology..This.section.provides.an.overview.of. commonly.used.PLC.terms,.beginning.with.the.terms.sensor. and.actuator. Sensors Sensors.are.devices.that.convert.a.physical.condition.into.an. electrical.signal.for.use.by.a.controller,.such.as.a.PLC..Sensors. are.connected.to.the.input.of.a.PLC..A.pushbutton.is.one. example.of.a.sensor.that.is.often.connected.to.a.PLC.input..An. electrical.signal.indicating.the.condition.(open.or.closed).of.the. pushbutton.contacts.is.sent.from.the.pushbutton.to.the.PLC. Actuators. Actuators.are.devices.that.convert.an.electrical.signal.from.a. controller,.such.as.a.PLC,.into.a.physical.condition..Actuators.are. connected.to.the.PLC.output..A.motor.starter.is.one.example.of. an.actuator.that.is.often.connected.to.a.PLC.output..Depending. on.the.status.of.the.PLC.output,.the.motor.starter.either. provides.power.to.the.motor.or.prevents.power.from.flowing.to. the.motor. Discrete Input Discrete Output Actuator Sensor Central Input Processing Output Point Point Unit (CPU) Pushbutton Motor Motor Starter Discrete Inputs and Outputs. Discrete inputs and outputs,.also.referred.to.as.digital inputs.and.outputs,.are.either.on.or.off..Pushbuttons,.toggle.
  • Page 14 Analog Inputs and Outputs. Analog inputs and outputs.are.continuous,.variable.signals.. Typical.analog.signals.vary.from.0.to.20.milliamps,.4.to. 20.milliamps,.or.0.to.0.volts.. In.the.following.example,.a.level.transmitter.monitors.the.level. of.liquid.in.a.storage.tank.and.sends.an.analog.signal.to.a.PLC. input..An.analog.output.from.the.PLC.sends.an.analog.signal.to. a.panel.meter.calibrated.to.show.the.level.of.liquid.in.the.tank.. Two.other.analog.outputs,.not.shown.here,.are.connected.to. current-to-pneumatic.transducers.that.control.air-operated.flow- control.valves..This.allows.the.PLC.to.automatically.control.the. flow.of.liquid.into.and.out.of.the.storage.tank. Panel Level Meter Transmitter Central Analog Processing Analog Input Output Unit (CPU) Storage Tank CPU. The.central processor unit (CPU).is.a.microprocessor.system. that.contains.the.system.memory.and.is.the.PLC’s.decision- making.unit..The.CPU.monitors.inputs,.outputs,.and.other. variables.and.makes.decisions.based.on.instructions.held.in.its. program.memory.
  • Page 15 Ladder Logic Programming A.program.consists.of.instructions.that.accomplish.specific. tasks..The.degree.of.complexity.of.a.PLC.program.depends. upon.the.complexity.of.the.application,.the.number.and.type.of. input.and.output.devices,.and.the.types.of.instructions.used. Ladder logic (LAD).is.one.programming.language.used.with. PLCs..Ladder.logic.incorporates.programming.functions.that.are. graphically.displayed.to.resemble.symbols.used.in.hard-wired. control.diagrams.. The.left.vertical.line.of.a.ladder.logic.diagram.represents.the. power.or.energized.conductor..The.output.coil.instruction. represents.the.neutral.or.return.path.of.the.circuit..The.right. vertical.line,.which.represents.the.return.path.on.a.hard-wired. control.line.diagram,.is.omitted..Ladder.logic.diagrams.are.read. from.left-to-right.and.top-to-bottom..Rungs.are.sometimes. referred.to.as.networks..A.network.may.have.several.control. elements,.but.only.one.output.coil. Power Conductor Normally Open Contact Instructions Network 1 I0.0 I0.1 Q0.0 Output Coil Instruction Network 2 I0.4 Q0.0 I0.5 Statement List and While.ladder.logic.programs.are.still.common,.there.are.many.
  • Page 16 In.the.following.example,.the.program.segments.perform.the. same.function.. Statement List (STL) Function Block Diagram (FBD) Ladder Logic (LAD) Network 1 Network 1 Network 1 I0.0 I0.1 Q0.0 I0.0 I0.0 I0.1 Q0.0 I0.1 Q0.0 Network 2 Network 2 Network 2 I0.4 I0.4 Q0.0 I0.4 Q0.1 I0.5 I0.5 Q0.1 I0.5 In.addition.to.LAD,.STL,.and.FBD,.multiple.other.types.of.
  • Page 17 Memory Types and Size. Kilo,.abbreviated.k,.normally.refers.to.000.units..When.talking. about.computer.or.PLC.memory,.however,.k.means.024..This. is.because.of.the.binary.number.system.(2 =024)..k.can.refer. to.024.bits,.bytes,.or.words,.depending.the.context. Random Access Memory (RAM).is.memory.that.allows.data. to.written.to.and.read.from.any.address.(location)..RAM.is.used. as.a.temporary.storage.area..RAM.is.volatile,.meaning.that. the.data.stored.in.RAM.will.be.lost.if.power.is.lost..A.battery. backup.is.required.to.avoid.losing.data.in.the.event.of.a.power. loss.. Read Only Memory (ROM).is.a.type.of.memory.used.were. it.is.necessary.to.protect.data.or.programs.from.accidental. erasure..The.original.data.stored.in.ROM.can.be.read,.but. not.changed..In.addition,.ROM.memory.is.nonvolatile..This. means.that.information.will.not.be.lost.as.the.result.of.a.loss.of. electrical.power..ROM.is.normally.used.to.store.the.programs. that.define.the.capabilities.of.the.PLC. Erasable Programmable Read Only Memory (EPROM). provides.a.level.of.security.against.unauthorized.or.unwanted. changes.in.a.program..EPROMs.are.designed.so.that.data. stored.in.them.can.be.read,.but.not.easily.altered..Changing. EPROM.data.requires.a.special.effort..UVEPROMs.(ultraviolet. erasable.programmable.read.only.memory).can.only.be.erased. with.an.ultraviolet.light..EEPROM.(electronically.erasable. programmable.read.only.memory),.can.only.be.erased.
  • Page 18 Putting it Together. The.user.memory.of.a.PLC,.such.as.the.S7-200.PLC.shown.in. the.following.illustration,.includes.space.for.the.user.program.as. well.as.addressable.memory.locations.for.storage.of.data..The. amount.of.program.and.data.space.available.depends.on.the. CPU.model. User.program.space.stores.instructions.that.are.executed. repetitively.as.part.of.the.PLC.scan..The.user.program.is. developed.using.a.programming.device,.such.as.a.personal. computer.(PC).with.programming.software,.then.loaded.into.the. user.program.memory.of.the.PLC. A.variety.of.addressable.memory.locations.are.used.for.storage. of.data.that.is.available.to.the.user.program..Among.other. things,.this.includes.memory.locations.for.variable.data,.discrete. inputs.and.outputs,.analog.inputs.and.outputs,.timers,.counters,. high-speed.counters,.etc. Q0.0 I0.0 I0.1 I0.4 Q0.1 I0.5...

  • Page 19: Basic.requirements

    Basic Requirements Throughout.this.course.we.will.be.using.the.S7-200.PLC.for. specific.examples.of.PLC.concepts..The.S7-200.PLC.is.used. for.this.purpose.because.of.its.ease.of.use.and.wide-spread. application.. The.items.shown.in.the.following.illustration.are.needed.to. create.or.change.an.S7-200.PLC.program..The.program.is. created.using.STEP 7-Micro/WIN.programming.software,. which.runs.on.a.Windows-based.personal.computer.(Win2000,. Windows.XP ,.and.higher.operating.system).. A.special.cable.is.needed.when.a.personal.computer.is.used.as. a.programming.device..Two.versions.of.this.cable.are.available.. One.version,.called.an.RS-232/PPI Multi-Master Cable,. connects.a.personal.computer’s.RS-232.interface.to.the.PLC’s. RS-485.connector..The.other.version,.called.a USB/PPI Multi- Master Cable,.connects.a.personal.computer’s.USB.interface. to.the.PLC’s.RS-485.connector. Programming Device Software STEP 7 - Micro/WIN Programming Device Cable SF/DIAG S7-200 PLC...
  • Page 20 Review 2. Pushbuttons,.limit.switches,.and.relay.contacts.are. examples.of.devices.that.may.be.connected.to.PLC. ____________.inputs. 2.. Solenoids,.relay.and.contactor.coils,.and.indicator.lamps. are.examples.devices.that.may.be.connected.to.PLC. .___________.outputs. 3.. The._____.contains.the.system.memory.and.makes. decisions.based.on.instructions.stored.in.program. memory. 4.. ______._____.is.a.PLC.programming.language.that. incorporates.programming.functions.that.are.graphically. displayed.to.resemble.symbols.used.in.hard-wired. control.diagrams. 5.. _________.____.and.________._____.________.are.also. common.examples.of.ways.to.program.a.PLC. 6.. A.PLC.program.is.executed.as.part.of.a.repetitive. process.referred.to.as.a.____. 7 .. When.talking.about.computer.or.PLC.memory,.k.refers. to.______.bits,.bytes,.or.words. 8.. Software.that.is.burned.into.EPROM.is.called. ____________. 9.. An.RS-232/PPI.Multi-Master.cable.or.a.USB/PPI-Multi- Master.cable.may.be.used.to.connect.a.personal. computer.to.an.S7-200.PLC’s.__________.connector.

  • Page 21: S7-200.Micro.plcs

    S7-200 Micro PLCs The.S7-200.Micro.PLC.is.the.smallest.member.of.the.SIMATIC. S7.family.of.programmable.controllers.. Each.S7-200.central.processing.unit.(CPU).model.also.includes. input.and.output.points.in.the.same.housing.as.the.CPU. Inputs.and.outputs.(I/O).are.the.system.control.points..Inputs. monitor.field.devices,.such.as.switches.and.analog.sensors.. Outputs.control.other.devices,.such.as.motors.and.control. valves.. The.programming.port.is.the.connection.to.the.programming. device.and.also.provides.a.means.for.connecting.the.PLC.to. other.devices,.such.as.display.panels. SF/DIAG S7-200 Models. There.are.six.S7-200.CPU.types.(CPU 221,.CPU 222,.CPU 224,. CPU 224XP,.CPU 224XPsi,.and.CPU 226).and.two.power. supply.configurations.for.each.type.. Model Description Power Supply Input Types Output Types Comm Ports 221 D C /D C /D C 20.4-28.8 V D C 6 x 24 V D C 4 x 24 V D C...
  • Page 22 In.the.model.description,.the.first.term.following.the.CPU.type. indicates.the.power.supply.type,.the.second.term.indicates. the.input.type,.and.the.third.term.indicates.the.output.type.. For.example,.a.222.AC/DC/Relay.model.is.powered.from.an.AC. source,.has.DC.input.points,.and.relay.contact.output.points. S7-200 Features.. The.S7-200.family.includes.a.range.of.CPUs.which.provide. a.variety.of.features.to.aid.in.designing.a.cost-effective. automation.solution..The.accompanying.table.provides.a. summary.of.the.major.features,.many.of.which.are.covered.in. this.course..Note.that.the.CPU.224XPsi.has.0.current.sinking. digital.outputs,.but.its.other.features.are.the.same.as.for.the. CPU.224XP . Feature CPU 221 CPU 222 CPU 224 CPU 224XP CPU 226 CPU 224XPsi Memory Program (with run mode edit) 4096 Bytes 4096 Bytes 8192 Bytes 12288 Bytes 16384 Bytes Program (w/o run mode edit)
  • Page 23 Power Sources. Depending.on.the.CPU.model,.an.S7-200.CPU.is.powered.from. either.a.24.VDC.or.a.20.to.240.VAC.power.supply..For.example,. an.CPU.22.DC/DC/DC.model.is.powered.from.a.24.VDC.power. supply.and.a.CPU.222.AC/DC/Relay.model.is.powered.from.a. 20.or.240.VAC.power.supply. DC Voltage Source 24 VDC (Nominal Voltage) AC Voltage Source 120 to 240 VAC (Nominal Voltage) Mode Switch and Analog. Each.S7-200.CPU.has.a.mode switch.with.three.positions, Adjustment. RUN,.STOP,.and.TERM..When.the.mode.switch.is.in.the. RUN.position,.the.CPU.is.in.the.RUN.mode.and.executing.the. program,.unless.a.fault.has.occurred..When.the.mode.switch. is.in.the.STOP.position,.the.CPU.is.in.the.STOP.mode.and. not.executing.the.user.program..When.the.mode.switch.is.in. the.TERM.position,.the.programming.device.can.select.the. operating.mode.
  • Page 24 SF/DIAG Mode Switch Analog Adjustment 212-1BB23-0XB0 An.analog adjustment.is.available.to.increase.or.decrease. values.stored.in.special.memory..This.can.allow.a.variable.in.the. user.program.to.change.as.the.analog.adjustment.is.changed.. CPU.22.and.CPU.222.models.have.one.analog.adjustment.. CPU.224,.CPU.224XP ,.CPU.224.XPsi,.and.CPU.226.have.two. analog.adjustments. CPU Status Indicators. The.CPU status indicators.display.the.current.CPU.mode.. When.the.CPU.is.in.the.RUN.mode,.the.green.RUN indicator. is.lit..When.the.CPU.is.in.the.STOP.mode,.the.yellow.STOP indicator.is.lit..The.System Fault/Diagnostic (SF/DIAG) indicator.turns.red.for.a.system.fault.and.yellow.to.indicate. certain.diagnostic.conditions. I A G S F / D CPU Status Indicators The.I/O status indicators.represent.the.on.or.off.status.of. corresponding.inputs.and.outputs..For.example,.when.the.CPU.
  • Page 25 Optional Cartridges S7-200.CPUs.support.an.optional.memory cartridge.that. provides.portable.EEPROM.storage.for.the.user.program..The. cartridge.can.be.used.to.copy.a.program.from.one.S7-200.PLC. to.a.like.S7-200.PLC...Two.memory.cartridge.sizes.are.available,. 64k.and.256k.bytes. Two.other.cartridges.are.also.available..A.real-time clock with battery.is.available.for.use.on.the.CPU.22.and.CPU.222..(CPU. 224,.CPU.224XP ,.CPU.224XPsi,.and.CPU.226.have.a.real-time. clock.built.in.)..The.battery.provides.up.to.200.days.of.data. retention.time.in.the.event.of.a.power.loss..Another.cartridge.is. available.with.a.back-up battery only. S F/ D IA G...
  • Page 26 Inputs and Outputs Input.devices,.such.as.switches,.pushbuttons,.and.other. sensors.are.connected.to.the.terminal.strip.under.the.bottom. cover.of.the.PLC. Output Devices Local Output Points SF/DIAG SF/DIAG Local Input Points Input Simulator Input Devices A.convenient.method.of.testing.a.program.is.to.wire.toggle. switches.to.the.inputs..Input simulators.with.pre-wired.toggle. switches.are.available.for.use.with.S7-200.PLCs..Switches.are. wired.between.the.24.VDC.power.supply.(L+).and.the.inputs.. For.example,.the.switch.on.the.far.left.is.wired.between.the. first.input.(0.0).and.L+..When.the.switch.is.closed,.24.VDC.is. applied.to.the.input..When.the.switch.is.open,.0.VDC.is.applied. to.the.input.. Output.devices,.such.as.relays,.are.connected.to.the.terminal. strip.under.the.top.cover.of.the.PLC..When.testing.a.program,. it.is.not.necessary.to.connect.output.devices..The.LED.status. indicators.signal.if.an.output.is.active.
  • Page 27 An.optional.fan-out connector.allows.field.wiring.connections. to.remain.fixed.when.removing.or.replacing.a.CPU.22.or. CPU.222..The.appropriate.connector.slides.into.either.the.input,. output,.or.expansion.module.terminals. Field Wiring Optional Fan-out Connector for CPU 221 or CPU 222 Connector Posts CPU 224, CPU 224XP, and CPU 226 Removeable Terminal Strip CPU.224,.CPU.224XP ,.CPU.224XPsi,.and.CPU.226.do.not.have. an.optional.fan-out.connector..Instead,.their.terminal.strips.are. removable.. Super Capacitor. A.super capacitor,.so.named.because.of.its.ability.to.maintain a.charge.for.a.long.period.of.time,.protects.data.stored.in.RAM. in.the.event.of.a.power.loss.. The.RAM.memory.is.typically.backed.up.for.50.hours.on.the. CPU.22.and.CPU.222.and.for.00.hours.on.the.CPU.224,.CPU. 224.XP ,.CPU.224.XPsi,.and.CPU.226..
  • Page 28 Expansion Modules. S7-200.PLCs.are.expandable.by.adding.expansion.modules.. Expansion modules.with.inputs.and/or.outputs.are.connected. to.the.base.unit.using.a.ribbon.connector.. SF/DIAG The.ribbon.connector.is.protected.by.a.cover.on.the.base.unit.. Side-by-side.mounting.completely.encloses.and.protects.the. ribbon.connector. SF/DIAG Mounting. S7-200.PLCs.can.be.mounted.in.one.of.two.ways..A.DIN.clip. allows.installation.on.a.standard.DIN rail..The.DIN.clip.snaps. open.to.allow.installation.and.snaps.closed.to.secure.the. unit.on.the.rail..The.S7-200.can.also.be.panel.mounted.using. installation.holes.located.behind.the.access.covers. Din Rail...
  • Page 29 Available Expansion. Most.S7-200.expansion.modules.are.designed.to.provide. additional.I/O..However,.several.expansion.modules.are.available. to.support.communication.options,.positioning,.and.weighing. (SIWAREX.MS). CPU.22.comes.with.6.discrete.inputs.and.4.discrete.outputs. and.does.not.accept.expansion.modules. CPU.222.comes.with.8.discrete.inputs.and.6.discrete.outputs. and.accepts.up.to.2.expansion.modules. CPU.224,.CPU.224XP ,.and.CPU.224XPsi.come.with.4.discrete. inputs.and.0.discrete.outputs.and.accept.up.to.7.expansion. modules..Note:.The.digital.outputs.for.the.CPU.224XPsi.are. current.sinking. CPU.226..comes.with.24.discrete.inputs.and.6.discrete. outputs.and.accepts.up.to.7.expansion.modules. 6 Inputs, 4 O utputs C P U 221 N o E xpansion M odules (E M ) 8 Inputs, 6 O utputs C P U 222 U p to 2 E xpansion M odules 14 Inputs, 10 O utputs...
  • Page 30 I/O Numbering S7-200.inputs.and.outputs.are.labeled.at.the.wiring.terminations. and.next.to.the.status.indicators..These.alphanumeric.symbols. identify.the.I/O.address.to.which.a.device.is.connected..This. address.is.used.by.the.CPU.to.determine.which.input.is.present. and.which.output.needs.to.be.turned.on.or.off. I.designates.a.discrete.input.and.Q.designates.a.discrete. output..The.first.number.identifies.the.byte,.the.second.number. identifies.the.bit. Image.register.space.for.digital.I/O.is.always.reserved.in. increments.of.eight.bits.(one.byte)..If.a.module.does.not. provide.a.physical.point.for.each.bit.of.each.reserved.byte,. these.unused.bits.cannot.be.assigned.to.subsequent.modules. in.the.I/O.chain. Each.analog.I/O.point.is.associated.with.a.6-bit.word.in.the. S7-200.PLC.and.is.identified.by.AI.(for.analog.input).or.AQ. (for.analog.output).followed.by.a.W.(representing.a.word.of. memory).and.a.starting.byte.number..Analog.I/O.words.start.on. even-numbered.bytes.(such.as.0,.2,.or.4). Analog.I/O.points.are.always.allocated.in.increments.of.two. points..If.a.module.does.not.provide.physical.I/O.for.each.of. these.points,.these.I/O.points.are.lost.and.are.not.available.for. assignment.to.subsequent.modules.in.the.I/O.chain. The.following.example.shows.the.addressing.for.one.sample. application. CPU 224XP Module 0 Module 1 Module 2 Module 3 Module 4 14 D iscrete In 10 D iscrete O ut 2 A nalog In 1 A nalog O ut 4 D iscrete In...
  • Page 31 SIMATIC Micro Panels Siemens.offers.a.variety.of.SIMATIC.Micro.Panels.designed.for. use.with.S7-200.PLCs..These.panels.provide.easy.to.implement. solutions.for.a.variety.of.display.needs. SIMATIC PANEL ENTER TD 100C TD200 SHIFT ESC ENTER TD 200 and TD 200C TP 177micro TD400C Simatic OP 73micro Value 49 HELP Tank 3 SHIFT ENTER SHIFT ENTER OP 73micro TD 400C Text.display.TD 100C.provides.a.4-line.display.with.up.to.6.
  • Page 32 Reference Manual. The.SIMATIC S7-200 Programmable Controller System Manual.provides.complete.information.on.installing.and. programming.the.S7-200.PLCs..This.manual.can.be.downloaded. as.a.PDF.file.from.the.Technical Info.link.on.the.Siemens. S7-S00.web.site: .http://www.automation.siemens.com/_en/s7-200/index.htm Preface, Contents Product Overview Getting Started SIMATIC Installing the S7-200 PLC Concepts S7-200 Programming Concepts, Programmable Controller Conventions and Features System Manual S7-200 Instruction Set Communicating over a Network...
  • Page 33 Review 3 The.six.models.of.S7-200.are._____.,._____.,._____.,. _____,._____,.and._____.. 2.. Which.of.the.following.is.not.available.for.an.CPU.22? a... Mode.Switch b... Expansion.Module c... Programming.Port d... Status.Indicators 3.. A.CPU.222.can.have.a.maximum.of___.expansion. modules.and.a.CPU.224.can.have.a.maximum.of.___. expansion.modules. 4.. A.CPU.222.DC/DC/DC.has.___.DC.inputs.and.___.DC. outputs.without.expansion.modules. 5.. A.CPU.224.DC/DC/DC.has.___.DC.inputs.and.___.DC. outputs.without.expansion.modules. 6.. The.fourth.output.of.an.S7-200.would.be.labeled. ______.. 7 .. S7-200.can.be.panel.mounted.or.installed.on.a.______. rail.

  • Page 34: Programming.a.plc

    Programming a PLC STEP 7-Micro/WIN32 . STEP 7-Micro/WIN.is.the.software.used.with.the.S7-200.PLC. to.create.a.user.program..STEP.7-Micro/WIN.programs.consist. of.a.number.of.instructions.that.must.be.arranged.in.a.logical. order.to.obtain.the.desired.PLC.operation. STEP.7-MicroWIN.programming.software.can.be.run.off.line. or.online..Off-line programming.allows.the.user.to.edit.the. program.and.perform.a.number.of.maintenance.tasks..The.PLC. does.not.need.to.be.connected.to.the.programming.device.in. this.mode. Online programming.requires.the.PLC.to.be.connected.to. the.programming.device..In.this.mode,.program.changes.are. downloaded.to.the.PLC..In.addition,.status.of.the.input/output. elements.can.be.monitored..The.CPU.can.be.started,.stopped,. or.reset... S7-200.PLCs.have.two.instruction.sets,.SIMATIC.and. IEC 1131-3..The.SIMATIC.instruction.set.was.developed.by. Siemens.prior.to.the.adoption.of.the.IEC.3-3.standard..The. IEC.3-3.instruction.set.was.adopted.by.the.International. Electrotechnical.Commission.(IEC).to.provide.a.common. approach.for.PLC.programming..The.IEC.3-3.instruction.set. is.often.preferred.by.users.who.work.with.PLCs.from.multiple. suppliers.
  • Page 35 STEP.7-Micro/WIN.has.three.editors.for.program.development,. one.for.each.of.the.types.of.programming.available,.ladder.logic. (LAD),.statement.list.(STL),.and.function.block.diagram.(FBD).. The.STL.editor.is.often.preferred.by.experienced.programmers. because.of.the.similarity.of.STL.programs.to.assembly. language.computer.programs..However,.the.STL.editor.can.only. be.used.with.the.SIMATIC.instruction.set..Both.the.LAD.and. FBD.editors.can.be.used.with.either.instruction.set..Throughout. this.course,.although.other.instruction.types.will.occasionally.be. shown,.the.emphasis.will.be.on.SIMATIC.LAD.instructions. Basic Ladder Logic Symbols PLC.ladder.logic.consists.of.a.commonly.used.set.of.symbols. that.represent.instructions..Understanding.these.basic.symbols. is.essential.to.understanding.PLC.operation. Contacts One.of.the.most.confusing.aspects.of.PLC.programming.for. first-time.users.is.the.relationship.between.the.device.that. controls.a.status.bit.and.the.programming.function.that.uses. a.status.bit..Two.of.the.most.common.programming.functions. are.the.normally open (NO) contact.and.the.normally closed (NC) contact..Symbolically,.power.flows.through.these. contacts.when.they.are.closed..The.normally.open.contact.(NO). is.closed.when.the.input.or.output.status.bit.controlling.the. contact.is...The.normally.closed.contact.(NC).is.closed.when. the.input.or.output.status.bit.controlling.the.contact.is.0. Coils. Coils.represent.relays.that.are.energized.when.power.flows. to.them..When.a.coil.is.energized,.it.causes.a.corresponding. output.to.turn.on.by.changing.the.state.of.the.status.bit. controlling.that.output.to...That.same.output.status.bit.may.be. used.to.control.normally.open.and.normally.closed.contacts. elsewhere.in.the.program.
  • Page 36 Boxes. Boxes.represent.various.instructions.or.functions.that.are. executed.when.power.flows.to.the.box..Typical.box.functions. include.timers,.counters,.and.math.operations. Entering Elements. Control elements.are.entered.in.the.ladder.diagram.by. positioning.the.cursor.and.selecting.the.element.from.a.list.. In.the.following.example.the.cursor.has.been.placed.in.the. position.to.the.right.of.I0.2..A.coil.was.selected.from.a.pull- down.list.and.inserted.in.this.position. Network 1 I0.0 I0.1 Q0.0 Network 2 Cursor I0.2...
  • Page 37 AND Operation. Each.rung.or.network.on.a.ladder.represents.a.logic.operation.. The.following.programming.example.demonstrates.an.AND operation..Two.contact.closures.and.one.output.coil.are.placed. on.network...They.are.assigned.addresses.I0.0,.I0.,.and.Q0.0.. Note.that.in.the.statement.list.a.new.logic.operation.always. begins.with.a.load.instruction.(LD)..In.this.example.I0.0.(input.). and.(A.in.the.statement.list).I0..(input.2).must.be.true.in.order. for.output.Q0.0.(output.).to.be.true..This.same.logic.is.also. shown.in.a.function.block.diagram.. The.following.truth.table.represents.the.state.of.the.output.for. each.combination.of.input.states. I0.0 I0.1 Q0.0...
  • Page 38 OR Operation. In.this.example,.an.OR operation.is.used.in.network...In.the. following.example,.if.either.input.I0.2.(input.3).or.(O.in.the. statement.list).input.I0.3.(input.4),.or.both.are.true,.then.output. Q0..(output.2).is.true.. The.following.truth.table.represents.the.state.of.the.output.for. each.combination.of.input.states. I0.2 I0.3 Q0 .1...
  • Page 39 Testing a Program. Once.a.program.has.been.written,.it.needs.to.be.tested.and. debugged..One.way.this.can.be.done.is.to.simulate.the.field. inputs.with.an.input.simulator,.such.as.the.one.made.for.the. S7-200.PLC.. The.program.is.first.downloaded.from.the.programming.device. to.the.CPU..The.selector.switch.is.placed.in.the.RUN.position.. The.simulator.switches.are.operated.and.the.resulting.indication. is.observed.on.the.output.status.indicator.lamps. SF/DIAG Input Simulator Contact and Coil Status After.a.program.has.been.loaded.and.is.running.in.the.PLC,.the. actual.status.of.ladder.elements.can.be.monitored.using.STEP.7. Micro/WIN.software.. For.example,.in.the.following.illustration,.the.toggle.switch. controls.the.status.bit.for.I2...As.long.as.the.toggle.switch.is. open,.the.I2..status.bit.is.a.logic.0..The.I2..status.bit.controls. the.I2..normally.open.contact..Because.the.I2..status.bit.is. a.logic.0,.the.normally.open.contact.function.is.open.and.no. power.is.passed.to.the.Q3..coil.function..As.a.result,.the.Q3.. status.bit.remains.a.logic.0.and.output.point.Q3..is.off. CPU Program Toggle Switch I2.1 Q3.1 Input Input Output Output Point Status Bit Status Bit Point I2.1...
  • Page 40 When.the.toggle.switch.closes,.input.point.I2..turns.on.and. I2..status.bit.changes.to.a.logic...This.causes.normally.open. contact.I2..to.close.and.turn.on.Q3..coil..Note.that.a.closed. contact.and.a.coil.that.is.on.are.shown.highlighted.in.the. program..When.Q3..coil.turns.on,.the.Q3..status.bit.goes.to.a. logic..and.output.point.Q3..turns.on..This.causes.the.lamp.to. light. CPU Program Toggle Switch I2.1 Q3.1 Input Input Output Output Point Status Bit Status Bit Point I2.1 I2.1 Q3.1 Q3.1 Lamp Logic 1 Logic 1 Forcing. Forcing.is.another.useful.tool.in.the.startup.and.maintenance. of.a.PLC.system..Forcing.overrides.one.or.more.input.or.output. status.bits,.causing.them.to.stay.in.either.a.logic.0.or.logic.. status.. For.example,.in.the.following.illustration,.the.toggle.switch.is. open..Under.normal.circumstances,.the.toggle.switch.would. have.to.be.closed.to.turn.on.the.lamp..However,.if.the.I2.. status.bit.is.forced.to.a.logic.,.the.lamp.will.turn.on,.as.long.as.
  • Page 41 The.following.table.shows.the.appearance.of.ladder.diagram. elements.with.associated.status.bits.in.the.on,.off,.forced.on,. and.forced.off.conditions.

  • Page 42: Discrete.inputs/Outputs

    Discrete Inputs/Outputs Motor Starter Example. While.the.lamp.application.previously.discussed.is.useful.to. explain.basic.PLC.operation,.a.more.practical,.and.only.slightly. more.complex,.application.is.start-stop.control.of.an.AC.motor.. Before.examining.the.PLC.application,.first.consider.a.hard- wired.approach.. The.following.line.diagram.illustrates.how.a.normally.open.and. a.normally.closed.pushbutton.might.be.connected.to.control. a.three-phase.AC.motor..In.this.example,.a.motor.starter.coil. (M).is.wired.in.series.with.a.normally.open,.momentary.Start. pushbutton,.a.normally.closed,.momentary.Stop.pushbutton,. and.normally.closed.overload.relay.(OL).contacts. Type/T ipo Frame- EG 100 Amp Circuit Breaker Contactor Overload Relay Motor Start Pushbutton Stop Pushbutton Starter Coil Auxiliary Contact (Holding Circuit) Momentarily.pressing.the.Start.pushbutton.completes.the.path. for.current.flow.and.energizes.the.motor.starter.(M)..This.closes. the.associated.M.and.Ma.(auxiliary.contact.located.in.the.motor.
  • Page 43 The.motor.will.run.until.the.normally.closed.Stop.button. is.pressed,.unless.the.overload.relay.(OL).contacts.open.. When.the.Stop.button.is.pressed,.the.path.for.current.flow.is. interrupted,.opening.the.associated.M.and.Ma.contacts,.and. the.motor.stops. PLC Motor Control. This.motor.control.application.can.also.be.accomplished. with.a.PLC..In.the.following.example,.a.normally.open.Start. pushbutton.is.wired.to.the.first.input.(I0.0),.a.normally.closed. Stop.pushbutton.is.wired.to.the.second.input.(I0.),.and. normally.closed.overload.relay.contacts.(part.of.the.motor. starter).are.connected.to.the.third.input.(I0.2)..These.inputs.are. used.to.control.normally.open.contacts.in.a.line.of.ladder.logic. programmed.into.the.PLC.. SF/D IAG CPU Program Start (NO) Input Output Points Point Network 1 I0.0 Q0.0 I0.0 I0.1 I0.2 Q0.0 Stop (NC) Motor Starter Motor I0.1 Q0.0 I0.2 Initially,.I0..status.bit.is.a.logic..because.the.normally.closed.
  • Page 44 Program Operation. When.the.Start.pushbutton.is.pressed,.the.CPU.receives.a.logic. .from.input.I0.0..This.causes.the.I0.0.contact.to.close..All.three. inputs.are.now.a.logic...The.CPU.sends.a.logic..to.output. Q0.0..The.motor.starter.is.energized.and.the.motor.starts. CPU Program Start (NO) Input Output Points Point Motor Network 1 I0.0 Q0.0 Starts I0.0 I0.1 I0.2 Q0.0 Stop (NC) Motor Starter Motor I0.1 Q0.0 I0.2 The.output.status.bit.for.Q0.0.is.now.a...On.the.next.scan,. when.normally.open.contact.Q0.0.is.solved,.the.contact.will. close.and.output.Q0.0.will.stay.on.even.if.the.Start.pushbutton. is.released. CPU Program Start (NO) Input Output Points...
  • Page 45 Adding Run and Stop. The.application.can.be.easily.expanded.to.include.indicator Indicator Lights. lights.for.run.and.stop.conditions..In.this.example,.a.RUN. indicator.light.is.connected.to.output.Q0..and.a.STOP.indicator. light.is.connected.to.output.Q0.2. The.ladder.logic.for.this.application.includes.normally.open. Q0.0.contact.connected.on.Network.2.to.output.coil.Q0.. and.normally.closed.Q0.0.contact.connected.on.Network.3. to.output.coil.Q0.2..When.Q0.0.is.off,.the.normally.open.Q0.0. contact.on.Network.2.is.open.and.the.RUN.indicator.off..At.the. same.time,.the.normally.closed.Q0.0.contact.is.closed.and.the. STOP.indicator.is.on. Start (NO) Input CPU Program Output Points Points Network 1 I0.0 Motor is Q0.0 I0.0 I0.1 I0.2 Q0.0 Stopped Stop (NC) Motor Starter Motor I0.1 Q0.0...
  • Page 46 Adding a Limit Switch. The.application.can.be.further.expanded.by.adding.a.limit. switch..The.limit.switch.could.be.used.in.this.application.for.a. variety.of.functions..For.example,.the.limit.switch.could.be.used. to.stop.the.motor.or.prevent.the.motor.from.being.started.. In.this.example,.the.limit.switch.is.associated.with.an.access. door.to.the.motor.or.its.associated.equipment..The.limit.switch. is.connected.to.input.I0.3.and.controls.a.normally.open.contact. in.the.program..If.the.access.door.is.open,.limit.switch.LS.is. open.and.normally.open.contact.I0.3.is.also.open..This.prevents. the.motor.from.starting. Start (NO) Input CPU Program Output Points Points Network 1 Motor is I0.0 Q0.0 I0.0 I0.1 I0.2 I0.3 Q0.0 Stopped Stop (NC) Motor Starter I0.1 Motor Q0.0 With I0.3 Contact Open, Motor will not Start...
  • Page 47 Further Expansion. The.PLC.program.can.be.further.expanded.to.accommodate.a. wide.variety.of.commercial.and.industrial.applications. Start/Stop.pushbuttons,.selector.switches,.indicator.lights,.and. signaling.columns.can.be.added..Motor.starters.can.be.added. for.control.of.additional.motors..Over-travel.limit.switches.can. be.added.along.with.proximity.switches.for.sensing.object. position..Various.types.of.relays.can.be.added.to.expand.the. variety.of.devices.being.controlled. As.needed,.expansion.modules.can.be.added.to.further. increase.the.I/O.capability..The.applications.are.only.limited.by. the.number.of.I/Os.and.amount.of.memory.available.for.the. PLC. Signaling Indicator Lights Relays Motor Starters Column Discrete Ouputs SF/DIAG Expansion Module Discrete Inputs Selector Pushbuttons Limit Switches Proximity Switches Switch...
  • Page 48 Review 4 Identify.the.following.symbols: a. ____________ b. ____________ c. ____________ 2.. Complete.the.following.tables: AND Function OR Function Input 1 Input 1 Input 2 Output Input 2 Output a. ___ e. ___ b. ___ f. ___ c. ___ g. ___ d. ___ h. ___ 3..

  • Page 49: Analog.inputs.and.outputs

    Analog Inputs and Outputs Many.PLCs.also.work.with.analog.I/O.devices..Analog.devices. use.signals.that.are.continuously.variable.within.a.specified. range,.such.as.0.to.0.VDC.or.4.to.20.mA. Analog.signals.are.used.to.represent.variable.values,.such.as. speed,.rate.of.flow,.temperature,.weight,.level,.etc..In.order.to. process.an.input.of.this.type,.a.PLC.must.convert.the.analog. signal.to.a.digital.value..S7-200.PLCs.convert.each.analog. voltage.or.current.value.into.a.2-bit.digital.value. Digital.values.from.analog.inputs.are.stored.in.addressable. memory.for.use.by.the.user.program..Similarly,.the.user. program.can.place.digital.values.in.addressable.memory. locations.for.conversion.to.analog.values.for.the.designated. analog.outputs. The.only.S7-200.CPU.model.with.analog.I/O.points.on.board. is.CPU.224XP ,.which.has.2.analog.inputs.and..analog.output.. However,.analog.I/O.points.can.be.added.using.expansion. modules.for.any.CPU.other.than.CPU.22..CPU.222.allows. for.2.expansion.modules.and.the.remaining.CPUs.allow.for.7. expansion.modules. Expansion.modules.are.available.with.4.or.8.analog.inputs,. 2.or.4.analog.outputs,.or.4.analog.inputs.and..analog. output..In.addition,.expansion.modules.are..available.for.use. with.thermocouples.or.RTD.type.sensors.which.sense.the. temperature.at.a.specific.point.in.a.machine.or.process.. SF/DIAG Analog Expansion Module...
  • Page 50 Analog Input Example. Analog.inputs.can.be.used.for.a.variety.of.purposes..In.the. following.example,.a.scale.is.connected.to.a.load.cell..A.load. cell.is.a.device.that.generates.an.electrical.output.proportional. to.the.force.applied. Package Route Controled by PLC Scale Inspection Station Finished Goods Inventory 0 to 10 VDC Analog Signal to PLC Desired Weight = 25 LBS = 5 VDC The.load.cell.in.this.example.converts.a.value.of.weight.from.0. to.50.pounds.into.a.0.-.0.VDC.analog.value..The.0.-.0.VDC.load. cell.signal.is.connected.to.an.S7-200.PLC’s.analog.input. The.analog.value.applied.to.the.PLC.can.be.used.in.various. ways..For.instance,.the.actual.weight.can.be.compared.to.a. desired.weight.for.a.package..Then,.as.the.package.is.moved. on.a.conveyor,..the.S7-200.PLC.can.control.a.gate.to.direct.
  • Page 51 Analog Output Example. Analog.outputs.from.a.PLC.are.often.supplied.directly.or. through.signal.converters.or.transmitters.to.control.valves,. instruments,.electronic.drives.or.other.control.devices.which. respond.to.analog.signals. For.example,.analog.outputs.from.the.PLC.could.be.used.to. control.the.flow.of.fluid.in.a.process.by.controlling.AC.drives.. Rather.than.simply.turning.the.AC.drives.on.or.off,.which.could. be.accomplished.by.discrete.outputs,.analog.signals.can.be. used.to.control.the.output.of.the.AC.drives...This.would.allow. the.speed.of.the.pumps.to.be.varied.dynamically.in.response.to. changes.in.process.requirements. AC Drives To Pump 1 Central Signal from Analog Processing Analog Level Transmitter Input Unit Outputs (CPU) To Pump 2 Process Level Transmitter Storage Tank Pump 1 Pump 2...

  • Page 52: Timers

    Timers In.a.PLC,.timers.are.programming.functions.that.keep.track. of.time.and.allow.PLC.programs.to.provide.varied.responses. depending.on.the.elapsed.time. Hard-wired Timing Circuit. Timers.in.a.PLC.program.can.be.compared.to.hard-wired.timing. circuits,.such.as.the.one.represented.in.the.accompanying. control.line.diagram..In.this.example,.normally.open.(NO).switch. (S).is.used.with.timer.(TR)..When.S.closes,.TR.begins. timing..When.the.timer’s.preset.time.elapses,.TR.closes.its. associated.normally.open.TR.contact.and.pilot.light.PL.turns. on..When.S.opens,.TR.de-energizes.immediately,.the.TR. contact.opens,.and.PL.turns.off.. Closes a preset time after S1 closes This.type.of.timer.is.referred.to.as.an.on-delay.timer..The.term. “on-delay”.indicates.that.the.timing.begins.when.the.timer. receives.a.signal.to.turn.on..In.this.example,.that.happens.when. S.closes.
  • Page 53 S7-200 SIMATIC Timers. The.S7-200.SIMATIC.LAD.instruction.set.includes.three.types. of.timers:.On-Delay.Timer.(TON),.Retentive.On-Delay.Timer. (TONR),.and.Off-Delay.Timer.(TOF)..Timers.are.represented.in.an. S7-PLC.ladder.logic.program.by.boxes. S7-200.timers.have.a.resolution.of..millisecond,. 0.milliseconds,.or.00.milliseconds..This.resolution.appears. in.the.lower.right.corner.of.the.timer.box..As.shown.in.the. following.illustration,.the.resolution.and.type.of.timer.that.can. be.used.depends.on.the.timer.number..The.maximum.value.of. time.shown.is.for.a.single.timer..By.adding.program.elements,. greater.time.intervals.can.be.timed. SIMATIC Timers Timer Number (T0 to T255) Txxx Txxx Txxx TONR xxx ms xxx ms xxx ms Retentive On-Delay Timer Off-Delay Timer On-Delay Timer Timer Resolution 1 ms, 10 ms, or 100 ms Timer Type Timer Number...
  • Page 54 In.the.following.timer.example,.when.input.I0.3.turns.on,.the. I0.3.contact.closes,.and.timer.T37.begins.timing..T37.has.a.time. base.of.00.ms.(0..seconds)..The.preset.time.(PT).value.has. been.set.to.50..Because.the.resolution.of.the.timer.is.set.to. 00.ms,.a.preset.value.of.50.is.equal.to.5.seconds.(50.x.00. ms)..Therefore,.5.seconds.after.the.I0.3.contact.closes,.timer. bit.T37.becomes.a.logic.,.the.T37.contact.closes,.and.output. coil.Q0..and.its.associated.output.point.turn.on. If.the.switch.opens.before.5.seconds.has.elapsed,.the. accumulate.time.resets.to.0..Because.this.type.of.timer.does. not.retain.its.accumulated.time.when.its.input.(IN).goes.to.logic. 0,.it.is.said.to.be.non-retentive. Network 1 I0.3 100 ms +150 Preset time = 150 x 100 ms = 15 seconds Network 2 Q0.1...
  • Page 55 SIMATIC Retentive On-Delay The.SIMATIC Retentive On-Delay Timer (TONR) functions.in. Timer (TONR). a.similar.manner.to.the.On-Delay.Timer.(TON)..Just.like.the.On- Delay.timer.(TON),.the.Retentive.On-Delay.Timer.(TONR).times. when.the.enabling.input.(IN).is.on..However,.the.Retentive.On- Delay.Timer.(TONR).does.not.reset.when.the.input.(IN).turns.off.. Instead,.the.timer.must.be.reset.with.a.Reset.(R).instruction. The.following.example.shows.a.Retentive.On-Delay.timer. (TONR).with.a.resolution.of.00.ms.and.preset.value.of.50.(5. seconds)..When.input.I0.3.turns.on,.I0.3.contact.closes,.and. timer.T5.begins.timing..If,.for.example,.after.0.seconds.input. I0.3.turns.off,.the.timer.stops..When.input.I0.3.turns.on.again,. the.timer.begins.timing.at.0.seconds..Timer.bit.T5.turns.on.5. seconds.after.input.I0.3.closes.for.the.second.time..When.timer. bit.T5.turns.on,.contact.T5.closes,.and.output.Q0..turns.on. The.Reset.(R).function,.shown.in.network.,.is.necessary.to. reset.the.accumulated.time.of.the.Retentive.On-delay.Timer. (TONR).to.zero..In.this.example,.the.Reset.(R).function.turns.on. and.resets.the.timer.when.contact.I0.2.closes..This.causes.the. T5.contact.to.open.and.output.Q0..to.turn.off. Network 1 I0.2 Network 2 I0.3 TONR 100 ms +150 Network 3 Q0.1...
  • Page 56 SIMATIC Off-Delay Timer The.SIMATIC Off-Delay Timer (TOF).begins.timing.when.input (TOF) (IN).turns.off..In.the.following.example,.when.contact.I.4. closes,.the.current.value.of.timer.T33.is.set.to.0,.timer.bit.T33. turns.on.immediately,.closing.the.T33.contact,.and.turning.on. output.Q2.3. When.contact.I.4.opens,.the.timer.times.until.the.preset.time. elapses,.200.ms.in.this.example..Then,.timer.bit.T33.turns.off,. contact.T33.opens,.and.output.Q2.3.turns.off. If.the.I.4.contact.had.closed.again.before.the.200.ms.preset. time.had.elapsed,.the.timer’s.current.value.would.again.be.set. to.0,.timer.bit.T33.would.remain.on,.contact.T33.would.remain. closed,.and.output.Q2.3.would.remain.on. Network 1 I1.4 10 ms Preset time = 20 x 10 ms = 200 ms Network 2 Q2.3...
  • Page 57 IEC 1131-3 Timers It.is.not.the.intent.of.this.course.to.cover.all.S7-200.instructions,. but.timer.instructions.provide.an.opportunity.to.understand. some.of.the.differences.between.the.SIMATIC.and.IEC.3-3. instruction.sets. The.timers.previously.discussed.were.SIMATIC.timers.. The.IEC 1131-3 instruction set.also.includes.three.timers,. On-Delay Timer (TON),.Off-Delay Timer (TOF),.and.Pulse Timer (TP)..The.same.three.resolutions.(.ms,.0,.ms,.and.00. ms).are.available.as.for.the.SIMATIC.timers,.and.the.resolution. is.determined.by.the.timer.number.as.shown.in.the.following. illustration. IEC 1131-3 Timers Timer Number (T0 to T255) %Txxx %Txxx %Txxx xxx ms xxx ms xxx ms On-Delay Timer Off-Delay Timer Pulse Timer Resolution...
  • Page 58 Review 5 CPU.________.has.two.analog.inputs.and.one.analog. output.on-board. 2.. Three.types.of.SIMATIC.timers.available.in.the.S7-200. instruction.set.are._____________,._____________,.and. _____________. 3.. The.maximum.time.value.for.a.00.millisecond.time. base.timer.is.____________.seconds. 4.. Which.SIMATIC.Timer.requires.a.Reset.instruction? 5.. Three.types.of.IEC.3-3.timers.available.in.the.S7-200. instruction.set.are._____________,._____________,.and. _____________.

  • Page 59: Counters

    Counters Just.like.mechanical.counters,.PLC.counter.instructions.keep. track.of.events..As.it.counts,.a.counter.instruction.compares.an. accumulated.count.value.to.a.preset.value.to.determine.when. the.desired.count.has.been.reached..Counters.can.be.used.to. start.an.operation.when.a.count.is.reached.or.to.prevent.an. operation.from.occurring.until.a.count.has.been.reached. S7-200 SIMATIC Counters. The.S7-200.SIMATIC.LAD.instruction.set.includes.three.types. of.counters:.Count.Up.Counter.(CTU),.Count.Down.Counter. (CTD),.and.Count.Up/Down.Counter.(CTUD). SIMATIC Counters Timer Number (C0 to C255) Cxxx Cxxx Cxxx CTUD Count Up Counter Count Down Counter Count Up/Down Counter The.Count Up Counter (CTU).counts.up.by.one.each.time. the.count.up.(CU).input.transitions.from.off.to.on..When.the. accumulated.count.equals.the.preset.value.(PV).the.counter. bit.(not.shown).turns.on..The.counter.continues.to.count.until. the.accumulated.count.equals.the.maximum.value.(32767)..
  • Page 60 The.Count Up/Down Counter (CTUD).counts.up.by.one.each. time.the.count.up.(CU).input.transitions.from.off.to.on.and. counts.down.by.one.each.time.the.count.down.(CD).input. transitions.from.off.to.on..When.the.accumulated.count.equals. the.preset.value.(PV),.the.counter.bit.turns.on..When.the.reset. input.(R).turns.on.or.when.a.Reset.instruction.is.executed,.the. accumulated.count.resets.to.zero.and.the.counter.bit.turns.off. If.the.count.reaches.the.maximum.positive.value.(32,767),. the.next.count.up.input.sets.the.accumulated.count.to.the. maximum.negative.value.(-32,767)..Similarly,.if.the.count. reaches.the.maximum.negative.value,.the.next.down.count. sets.the.accumulated.count.to.the.maximum.positive.value. Count Up/Down Counter.. Counters.are.common.instructions.used.for.counting.a.wide (CTUD) Example . variety.of.events.such.as.parts.manufactured.or.packed,.items. processed,.machine.operations,.etc..For.example,.a.counter. might.be.used.to.keep.track.of.the.items.in.an.inventory. storage.area. In.the.following.example,.Count.Up/down.Counter.(CTUD).C48. is.reset.to.zero.when.contact.I0.2.closes..This.could.be.event. could.be.triggered.automatically.or.manually.to.indicate.that.the. associated.storage.location.is.empty. When.contact.I0.0.closes,.the.counter.counts.up.by...This. could.be.triggered.by.a.proximity.switch.sensing.that.an.item. has.been.placed.in.the.storage.location. When.contact.I0..closes,.the.counter.counts.down.by...This. could.be.triggered.by.a.proximity.switch.sensing.that.an.item. has.been.removed.from.the.storage.location. I0.0 CTUD I0.1 I0.2 +150 Q0.1...
  • Page 61 In.this.example,.the.storage.location.has.50.spaces..When. the.accumulated.count.reaches.50,.the.counter.bit.turns. on,.contact.C48.closes,.and.output.Q0..turns.on..This.could. trigger.other.logic.in.the.program.to.divert.new.items.to. another.location.until.such.time.as.an.item.is.removed.from.this. location. IEC 1131-3 Counters. The.counters.previously.discussed.were.SIMATIC.counters..The. IEC.3-3.instruction.set.also.includes.three.counters..These. counters.are.similar.to.the.SIMATIC.counters,.but.there.are.a. few.differences. Each.IEC.3-3.counter.has.an.output.(Q).and.cumulative.value. (CV).in.the.counter.box. Count Up Counter (CTU).stops.counting.when.CV.equals.the. preset.value.(PV),.and.turns.on.output.Q. Except.for.the.CV.and.Q.values,.the.IEC.3-3.Count Down Counter (CTD).functions.like.the.SIMATIC.version..When.CV. equals.zero,.it.stops.counting,.and.output.Q.turns.on. Count Up/Down Counter (CTUD).stops.counting.up.when.CV. equals.PV.and.turns.on.output.QU..CTUD.stops.counting.down. when.CV.equals.zero.and.turns.on.output.QD. IEC 1131-3 Counters Timer Number (C0 to C255) Cxxx Cxxx Cxxx CTUD...

  • Page 62: High-Speed.instructions

    High-Speed Instructions As.discussed.earlier,.PLCs.have.a.scan.time..The.scan.time. depends.on.the.size.of.the.program,.the.number.of.I/Os,.and. the.amount.of.communication.required..However,.events.may. occur.in.an.application.that.require.a.response.from.the.PLC. sooner.than.the.scan.cycle.would.normally.permit..For.these. applications.high-speed.instructions,.such.as.those.associated. with.high-speed.counters,.can.be.used.. PLC Scan High-Speed Counters. A.high-speed counter.is.represented.by.two.boxes.in.ladder. logic..One.box.is.the.High-Speed Counter Definition (HDEF). instruction.and.the.other.box.is.the.High-Speed Counter (HSC).instruction. CPU.22.and.CPU.222.support.four.high-speed.counters. (HSC0,.HSC3,.HSC4,.HSC5)..CPU.224,.CPU.224XP ,.CPU. 224XPsi,.and.CPU.226.support.six.high-speed.counters.(HSC0,. HSC,.HSC2,.HSC3,.HSC4,.HSC5). HDEF MODE High-Speed Counter Definition High-Speed Counter...
  • Page 63 Definition Boxes and. The.High-Speed.Counter.Definition.(HDEF).instruction.assigns High-Speed Counters. the.operating.mode.to.a.specific.high-speed.counter.(HSCx).. The.mode.selection.defines.the.clock,.direction,.start,.and. reset.functions.of.the.high-speed.counter..High-speed.counters. can.be.defined.by.the.definition.box.to.operate.in.any.of.the. 2.available.modes..Not.all.counters.can.operate.in.all.of.the. available.modes,.however..Refer.to.the.S7-200.System.Manual. for.definitions.available.for.each.counter. The.High-Speed.Counter.(HSC).instruction.configures.and. controls.a.specific.high-speed.counter.based.upon.the.state.of. the.special.HSC.bits..The.N.parameter.specifies.the.high-speed. counter.number..Each.counter.has.dedicated.inputs.for.clocks,. direction.control,.reset,.and.start,.where.these.functions.are. supported.. Positioning Example. Positioning.is.one.example.of.an.application.that.may.require. use.of.a.high-speed.counter..In.the.following.illustration,.two. PLC.discrete.outputs.(one.for.forward.and.one.for.reverse). control.a.reversing.motor.starter,.which,.in.turn,.controls.a. motor. The.motor.shaft.is.connected.to.an.encoder.and.to.a.positioning. screw..A.platform.mounted.on.the.positioning.screw.moves. away.from.position.0.as.the.motor.turns.in.the.forward.direction. and.towards.position.0.as.the.motor.turns.in.the.reverse. direction..Pulses.from.the.encoder.are.connected.to.PLC.inputs. associated.with.a.high.speed.counter. 9 10 Encoder Motor Reversing Motor Starter In.this.example,.the.high-speed.counter.is.programmed.to. move.the.platform.from.position..to.position.6.and.later.to.
  • Page 64 Assume,.for.example,.that.the.encoder.generates.600.pulses. per.revolution,.and.it.takes.000.motor.revolutions.to.move. the.platform.from.one.position.to.another,.moving.the.platform. from.position..to.position.6.(5.positions).takes.5000.motor. revolutions.or.30,000.encoder.pulses..In.most.practical. applications,.the.frequency.of.these.pulses.is.too.high.for.them. to.be.counted.with.inputs.that.are.not.associated.with.a.high- speed.counter.. Interrupts. S7-200.PLCs.incorporate.instructions.for.use.with.interrupts.. Interrupts.are.used.to.initiate.a.specific,.short.PLC.program. segment,.called.an.interrupt.routine,.when.an.internal.or. external.event.occurs..After.the.interrupt.routine.has.been. executed,.control.is.returned.to.the.main.program. Three.types.of.interrupts.are.supported.by.S7-200.PLCs,. communication port interrupts,.I/O interrupts,.and.time- based interrupts..Communication.port.interrupts.are.used. to.control.a.communication.port.operated.in.Freeport.mode.. I/O.interrupts.are.used.to.respond.quickly.to.high-speed.I/O. transitions,.such.as.those.associated.with.high-speed.counters. or.pulse.train.outputs..Time-based.interrupts.allow.the.user. program.to.execute.an.interrupt.routine.on.a.cyclic.basis. Each.of.these.types.of.interrupts.has.an.associated.priority. that.determines.which.interrupt.is.processed.first.in.the.event. that.two.or.more.interrupts.are.requested.at.the.same.time.. Communication.port.interrupts.have.the.highest.priority.and. time-based.interrupts.have.the.lowest.priority. Pulse Training Output (PTO). S7-200.PLCs.have.two.PTO/PWM generators.that.create.either. a.high-speed.pulse.train.or.a.pulse.width.modulated.waveform.. One.generator.is.assigned.to.output.point.Q0.0.and.the.other.to. output.point.Q0...When.a.generator.is.activated,.it.controls.its. respective.output.
  • Page 65 The.number.of.pulses.and.the.cycle.time.can.be.changed.with. an.interrupt..In.the.accompanying.example,.each.pulse.is.initially. on.for.500.ms.and.off.for.500.ms..After.four.pulses,.an.interrupt. occurs.which.changes.the.cycle.time.to.2.seconds,..second.on. and..second.off. 1 sec 1 sec Interrupt 500 ms Occurs Pulse Width Modulation. The.Pulse Width Modulation (PWM) function.provides.a. (PWM) fixed.cycle.time.with.a.variable.duty.cycle..When.the.pulse. width.is.equal.to.the.cycle.time,.the.duty.cycle.is.00%.and.the. output.is.turned.on.continuously..In.the.following.example,.the. output.initially.has.a.0%.duty.cycle.(on.0%,.off.90%)..After.an. interrupt,.the.output.switches.to.a.50%.duty.cycle.(on.50%,.off. 50%). 10% Duty Cycle 50% Duty Cycle Interrupt Occurs The.PWM.function.can.be.used.to.provide.a.programmable. or.adjustable.control.of.machine.timing..This.allows.machine. operation.to.be.varied.to.compensate.for.product.variations.or. mechanical.wear. And Much More.

  • Page 66: Specialized.expansion.modules

    S7-200 PLC with Modem Computer EM 241 Modem Module The.EM.24.provides.an.international.telephone.line.interface. and.supports.sending.numeric.and.text.paging.messages,.as. well.as.SMS.(Short.Message.Service).messages.to.cellular. phones..This.is.useful.for.remote.diagnostics.and.maintenance,. machine.control,.alarm.systems,.and.general.communication. functions. In.addition.to.CPU-to-CPU.communication.via.a.telephone.line,. the.EM.24.also.supports.Modbus.RTU.protocol,.a.protocol. that.has.been.widely.used.for.many.years. SINAUT MD 720-3 SINAUT Telecontrol (Siemens Network Automation).permits GSM/GPRS Modem Module networking.of.individual.controls.and.control.systems.over.a. WAN.(Wide.Area.Network).. One.approach.for.providing.this.capability.is.SINAUT Micro.. This.is.a.simple.and.flexible.way.to.link.stationary.or.mobile. stations.to.a.master.control.center..SINAUT.Micro.is.appropriate. where.smaller.amounts.of.data.have.to.be.transmitted.to. permit.monitoring.and.control.of.remote.stations.using.wireless. techniques.with.the.General.Packet.Radio.Service.(GPRS).of.the. Global.System.for.Mobile.Communication.(GSM).mobile.radio. network..
  • Page 67 The.SINAUT MD720-3 GSM/GPRS Modem module.and. associated.ANT794-4MR antenna.are.the.hardware.elements. used.to.connect.an.S7-200.PLC.into.a.SINAUT.Micro.system.. SINAUT Micro SC software.is.also.required. WinCC flexiible, WinCC SINAUT MD720-3 720-3AA00 SINAUT MD 720-3 GSM/GPRS Modem Module Antenna CP 243-1, CP 243-1 IT Industrial.Ethernet.provides.a.proven.means.of.networking Communication Processors. computers.and.a.variety.of.intelligent.devices..CP 243-1 and CP 243-1 IT communication processors.are.used.to.connect.an. S7-200.PLC.to.an.Industrial Ethernet network.
  • Page 68 EM 277 PROFIBUS-DP. PROFIBUS DP.is.an.open,.international.fieldbus.communication Module. standard.that.allows.a.broad.range.of.intelligent.devices.from. various.manufacturers.to.communicate.rapidly.and.efficiently.. This.reduces.wiring.costs.as.well.as.start-up.and.maintenance. expenses.. EM 277 PROFIBUS-DP module.allows.connection.of.the. S7-200.CPU.(CPU.222.and.above).to.a.PROFIBUS-DP.network. as.a.slave.. Other Intelligent Non-Siemens Devices and Systems S7-200 PLC with Other SIMATIC Controllers EM 277 PROFIBUS DP Module Controllers SIMATIC S7 - 200 SF/DIAG EM 277 CPU 224 .1 .2 .3 .4 .5 .6 .7...
  • Page 69 EM 253 Position Module. Position.control.describes.a.range.of.applications.that.involve. movement.with.varying.degrees.of.precision..The.EM 253 Position module.is.a.simple.but.powerful.positioning.module. that.enables.the.user.to.control.position.systems.from.micro- steppers.to.intelligent.servo.drives.(with.integrated.closed-loop. control). SF/DIAG EM 253 Position ZP LMT 253-1AA22-0XA0 S7-200 PLC with EM 253 Position Module EM 253 Features. Features.of.the.module.include: •. Provides.high-speed.control.with.a.range.from.20.to.. 200,000.pulse.per.second •. Supports.both.S.curve.or.linear.acceleration.and. deceleration •. Provides.a.configurable.measuring.system.that.allows. you.to.enter.data.as.engineering.units.(such.as.inches.or. centimeters).or.as.a.number.of.pulses •.
  • Page 70 Expansion Modules for Two.S7-200.PLC.expansion.modules.are.available.for.accurate Temperature Measurement temperature.measurement, EM 231 Thermocouple module and EM 231 RTD module. EM.23.Thermocouple.module.provides.analog.inputs.for. thermocouples..A.thermocouple.is.a.temperature.sensor. made.from.two.dissimilar.metals.joined.at.a.point.called.a. junction..A.thermocouple.produces.a.small.voltage.that.is. dependent.upon.temperature..Various.types.of.thermocouples. are.available.for.use.in.different.temperature.ranges..Two. versions.of.EM.23.Thermocouple.modules.are.available,.one. for.four.thermocouples.and.one.for.eight.thermocouples..Each. version.is.compatible.with.J,.K,.T,.E,.R,.S,.or.N.thermocouples,. but.the.thermocouples.used.with.a.specific.module.must.be.of. the.same.type. EM.23.RTD.module.provides.analog.inputs.for.resistance temperature detectors (RTDs)..An.RTD.is.a.temperature. sensor.made.from.a.metal,.such.as.platinum,.nickel,.or.copper,. that.varies.in.resistance.in.a.predictable.manner.as.temperature. varies..Two.versions.of.the.EM.23.RTD.module.are.available,. one.with.two.analog.inputs.and.one.with.four.analog.inputs.. Either.version.can.be.used.with.a.variety.of.RTD.types,.but.the. RTDs.used.with.a.specific.module.must.be.of.the.same.type. SIMATIC S7 - 200 SF/DIAG CPU 224 AC/DC/RLY...
  • Page 71 SIWAREX MS Weighing SIWAREX MS Weighing module provides..a.simple,.easy Module to.install.approach.for.weighing.and.force.measurement. applications..SWAREX.MS.Weighing.module.is.designed.to. measure.the.voltage.produced.by.sensors.commonly.used.to. measure.weight,.force,.or.torque. SIWAREX.MS.is.easily.integrated.into.an.S7-200.PLC.system. as.an.expansion.module..This.makes.information.obtained.from. SIWAREX.MS.available.to.other.components.of.the.automation. system..In.addition,.Siemens.offers.a.wide.variety.of.compatible. sensors.and.other.components. S7-200 PLC with SIWAREX MS Module SIMATIC S7 - 200 SF/DIAG CPU 224XP .1 .2 .3 .4 .5 .6 .7 .0 .1 DC/DC/DC...
  • Page 72 Review 6 Three.types.of.SIMATIC.counters.available.in.the. S7-200.instruction.set.are.____________,.____________. and.____________. 2... CPU.22.and.CPU.222.support.____.high.speed. counters..CPU.224,.CPU.224XP ,.CPU.224XPsi,.and.CPU. 226.support.____.high.speed.counters. 3.. S7-200.PLCs.have.two.___________.that.create.either. a.high-speed.pulse.train.or.a.pulse-width.modulated. waveform. 4.. ________.and.________.communication.processors. are.used.to.connect.an.S7-200.PLC.to.an.Industrial. Ethernet.network. 5.. _________.module.allows.connection.of.an.S7-200.CPU. (CPU222.and.above).to.a.PROFIBUS-DP.network.as.a. slave. 6.. _________.module.allows.connection.of.an.S7-200.CPU. (CPU222.and.above).to.an.AS-I.network.as.a.master. 7 .. Two.versions.of.EM.23.Thermocouple.module.are. available,.one.for.____.thermocouples.and.one.for.____. thermocouples. 8.. Two.versions.of.EM.23.RTD.module.are.available,.one. for.____.RTDs.and.one.for.____.RTDs.

  • Page 73: Review.answers

    Review Answers Review 1 ).a:.input.module,.b:.CPU,.c:.output.module,.d:.programming. device,.e:.operator.interface;.2).2;.3).6;.4).00,.000.0000,.A. Review 2. ).discrete;.2).discrete;.3).CPU;.4).Ladder.logic;.5).Statement. list,.function.block.diagrams;.6).scan;.7)024;.8).firmware; 9).RS-485. Review 3. ).CPU.22,.CPU.222,.CPU.224,.CPU.224XP ,.CPU.224XPsi,. CPU.226;.2).b;.3).2,.7;.4).8,.6;.5).4,.0;.6).Q0.3;.7).DIN. Review 4. ).a:.box,.b:.normally.open.contact,.c:.coil;. 2).AND.Function.-.a:.0,.b:.0,.c:.0,.d:.,. OR.Function.-.e:.0,.f:.,.g:.,.h:.;. 3).I0.,.I0.0,.Q0.0. Review 5. ).224XP;.2).On-Delay.Timer.(TON),.Retentive.On-Delay.Timer. (TONR),.Off-Delay.Timer.(TOF).;.3).3276.7.seconds;. 4).Retentive.On-Delay.Timer.(TONR);.5).On-Delay.Timer.(TON),. Off-Delay.Timer.(TOF),.Pulse.Timer.(TP). Review 6. ).Count.Up.Counter.(CTU),.Count.Down.Counter.(CTD),.Count. Up/Down.Counter.(CTUD);.2).4,.6;.3).PTO/PWM.generators; 4).CP.243-,.CP.243-.IT;.5).EM.277.PROFIBUS-DP 6).CP.243-2.AS-Interface.Master;.7).4,.8;.8).2,.4..

  • Page 75: Final.exam

    Final Exam You.can.test.your.knowledge.by.taking.the.final.exam.for.this. course.online.at.http://www.usa.siemens.com/step..This. web.page.provides.links.to.a.variety.of.our.quickSTEP.online. courses..To.complete.the.final.exam.for.this.course,.click.on.the. Basics of PLCs.link.. Next,.move.your.mouse.over.to.the.left.so.that.the.navigation. bar.pops.out.and.select.the.Final Exam.link..The.final. exam.page.will.appear..Before.taking.the.final.exam,.it.is. recommended.that.you.delete.the.temporary.files.on.your. computer..For.most.versions.of.Internet Explorer,.you.can.do. this.by.selecting.Internet Options.from.the.Tools.menu.and. then.clicking.on.the.Delete Files.button..If.you.do.not.perform. this.step,.you.may.see.a.score.of.0%.after.you.submit.your. exam.for.grading. After.you.complete.the.final.exam,.click.on.the.Grade the Exam.button.at.the.bottom.of.the.page..Your.score.on.the.exam. will.be.displayed.along.with.the.questions.that.you.missed.. If.you.score.70%.or.better.on.the.exam,.you.will.be.given.two. options.for.displaying.and.printing.a.certificate.of.completion.. The.Print Certificate.option.allows.you.to.display.and.print.the. certificate.without.saving.your.score.in.our.database.and.the. Save Score.option.allows.you.to.save.your.score.and.display. and.print.your.certificate.

This manual is also suitable for:

Simatic s7-300Simatic s7-400Logo!Simatic s7-200Simatic s7-1200

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