Allen-Bradley 1794-IE8 Series B User Manual
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Allen-Bradley 1794-IE8 Series B User Manual

Flex i/o analog modules
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Allen Bradley
User Manual
FLEX I/O Analog
Modules
(Cat. No. 1794 IE8, OE4,
and IE4XOE2 Series B)

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Summary of Contents for Allen-Bradley 1794-IE8 Series B

  • Page 1 Allen Bradley User Manual FLEX I/O Analog Modules (Cat. No. 1794 IE8, OE4, and IE4XOE2 Series B)
  • Page 2 Allen-Bradley publication SGI–1.1, “Safety Guidelines For The Application, Installation and Maintenance of Solid State Control” (available from your local Allen-Bradley office) describes some important differences between solid-state equipment and electromechanical devices which should be taken into consideration when applying products such as those described in this publication.

  • Page 3: New Information

    New series B analog modules are now available for Flex I/O users. These modules are: 1794-OE4 series B 4 output analog module 1794-IE8 series B 8 input analog module 1794-IE4XOE2 series B 4 in/2 out combo analog module The differences between series A and series B are explained in Appendix B.

  • Page 4: Table Of Contents

    Table of Contents Summary of Changes ......New Information ........Addition of DeviceNet Mapping .
  • Page 5 Table of Contents Module Programming ......Chapter Objectives ........Block Transfer Programming .
  • Page 6 Table of Contents Range Selection Bits for the 1794 OE4/B Analog Output Module (Word 5) ......Word/Bit Descriptions for the 1794 OE4/B Analog Output Module Write .
  • Page 7 Table of Contents Specifications ........Differences Between Series A and Series B Analog Modules Data Table Formats .

  • Page 8: Using This Manual

    Allen-Bradley programmable controllers. The manual helps you install, program and troubleshoot your modules. Audience You must be able to program and operate an Allen-Bradley programmable controller to make efficient use of your FLEX I/O modules. In particular, you must know how to program block transfers.

  • Page 9: Conventions

    P–2 Using This Manual Conventions We use these conventions in this manual: In this manual, we show: Like this: that there is more information about a topic in another chapter in this manual that there is more information about the topic in another manual More For Additional Information...

  • Page 10: Overview Of Flex I/O And Your Analog Modules

    Chapter Overview of FLEX I/O and your Analog Modules Chapter Objectives In this chapter, we tell you about: what the FLEX I/O system is and what it contains types of FLEX I/O analog modules how FLEX I/O analog modules communicate with programmable controllers the features of your analog modules The FLEX I/O System...

  • Page 11: Types Of Flex I/O Modules

    FLEX I/O analog input, output and combination modules are block transfer modules that interface analog signals with any Allen-Bradley programmable controllers that have block transfer capability. Block transfer programming moves input from the module’s memory to a designated area in the processor data table, and output data words from a designated area in the processor data table to the module’s memory.
  • Page 12 Overview of FLEX I/O and your Analog Modules 1–3 Figure 1.1 An Example of Communication Between an Adapter and an Analog Input Module The adapter transfers your configuration data External devices transmit to the module using a BTW. analog signals to the module. Flexbus Allen Bradley Allen Bradley...

  • Page 13: Features Of Your Analog Modules

    1–4 Overview of FLEX I/O and your Analog Modules Features of your Analog Each module has a unique label identifying its keyswitch position, Modules wiring and module type. A removable label provides space for writing individual designations per your application. 1794 IE8 Module Type Allen Bradley...

  • Page 14: How To Install Your Analog Module

    Chapter How to Install Your Analog Module Chapter Objectives In this chapter, we tell you about: how to install your module how to set the module keyswitch how to wire the terminal base the indicators Before You Install Your Before installing your analog module in the I/O chassis: Analog Module You need to: As described under:...

  • Page 15: Low Voltage Directive

    Programmable Controllers, Part 2 – Equipment Requirements and Tests. For specific information required by EN 61131-2, see the appropriate sections in this publication, as well as the following Allen-Bradley publications: Industrial Automation Wiring and Grounding Guidelines For Noise Immunity, publication 1770-4.1 Guidelines for Handling Lithium Batteries, publication AG-5.4...
  • Page 16 How to Install Your Analog Module 2–3 Methods of wiring the terminal base units are shown in the illustration below. ATTENTION: Do not daisy chain power or ground from an analog terminal base unit to any ac or dc discrete module terminal base unit. Analog Module Analog Module Analog Module...

  • Page 17: Installing The Module

    2–4 How to Install Your Analog Module Installing the Module Installation of the analog module consists of: mounting the terminal base unit installing the analog module into the terminal base unit installing the connecting wiring to the terminal base unit If you are installing your module into a terminal base unit that is already installed, proceed to “Mounting the Analog Module on the Terminal Base”...

  • Page 18: Panel/Wall Mounting

    How to Install Your Analog Module 2–5 5. Rotate the terminal base onto the DIN rail with the top of the rail hooked under the lip on the rear of the terminal base. Use caution to make sure that the female flexbus connector does not strike any of the pins in the mating male connector.
  • Page 19 2–6 How to Install Your Analog Module To install the mounting plate on a wall or panel: 1. Lay out the required points on the wall/panel as shown in the drilling dimension drawing. Drilling Dimensions for Panel/Wall Mounting of FLEX I/O (58.5) (35.5) (58.5)

  • Page 20: Mounting The Analog Module On The Terminal Base Unit

    How to Install Your Analog Module 2–7 Mounting the Analog Module on the Terminal Base Unit 1. Rotate the keyswitch (1) on the terminal base unit (2) clockwise to the position required for the specific type of analog module. Analog Module Cat. No. Keyswitch Position 1794 IE8 1794 OE4...
  • Page 21 2–8 How to Install Your Analog Module ATTENTION: Remove field-side power before removing or inserting the module. This module is designed so you can remove and insert it under backplane power. When you remove or insert a module with field-side power applied, an electrical arc may occur.
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  • Page 27: Module Programming

    Chapter Module Programming Chapter Objectives In this chapter, we tell you about: analog data format block transfer programming sample programs for the PLC-3 and PLC-5 processors Block Transfer Your module communicates with the processor through bidirectional Programming block transfers. This is the sequential operation of both read and write block transfer instructions.

  • Page 28: Sample Programs For Flex I/O Analog Modules

    3–2 Module Programming Sample programs for Flex The following sample programs show you how to use your analog I/O Analog Modules module efficiently when operating with a programmable controller. These programs show you how to: configure the module read data from the module update the module’s output channels (if used) These programs illustrate the minimum programming required for communication to take place.

  • Page 29: Figure 3.2

    Module Programming 3–3 Figure 3.2 PLC 3 Family Sample Program Structure for a 1794 OE4 Module Enable Program Action BLOCK XFER READ Block Transfer RACK: Read Done Bit GROUP: Done B6:0 At power up in RUN mode, or when the MODULE: processor is switched from PROG to RUN, CONTROL:...

  • Page 30: Plc 5 Programming

    3–4 Module Programming PLC 5 Programming The PLC-5 program is very similar to the PLC-3 program with the following exceptions: block transfer enable bits are used instead of done bits as the conditions on each rung. separate block transfer control files are used for the block transfer instructions.

  • Page 31: Figure 3.6

    Module Programming 3–5 Figure 3.6 PLC 5 Family Sample Program Structure for the 1794 IE4XOE2 BTW Enable Bit BTR Enable Bit Program Action N16:5 N16:0 BLOCK TRANSFER READ RACK: At power up in RUN mode, or when the GROUP: processor is switched from PROG to RUN, MODULE: the user program enables a block transfer N16:0...

  • Page 32: Analog Data Format

    3–6 Module Programming Analog Data Format The data returned from the analog-to-digital converter in the module is 12-bit resolute. This value is left-justified into a 16-bit field, reserving the most significant bit for a sign bit. 11 10 09 08 07 06 05 04 03 02 01 00 A/D Unipolar Data 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 Analog Value...

  • Page 33: Writing Configuration To And Reading Status From Your Module With A Remote I/O Adapter

    Chapter Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter Chapter Objectives In this chapter, we tell you about: configuring your module’s features entering your data reading data from your module read block format Configuring Your Analog Because of the many analog devices available and the wide variety Module of possible configurations, you must configure your module to...

  • Page 34: Range Selection

    4–2 Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter Range Selection Individual input channels are configurable to operate with the following voltage or current ranges: Bit Settings Ranges Configure Full Range Select 0-10V dc/0-20mA 4-20mA 10 to +10V dc When configured to Off, individual output channels will drive 0V/0mA.

  • Page 35: Mapping Data For The Analog Modules

    Configuring Your Module and Reading Status from Your Module with a Remote I/O Adapter 4–3 Mapping Data for the The following read and write words and bit/word descriptions Analog Modules describe the information written to and read from the analog modules.

  • Page 36: Word/Bit Descriptions For The 1794 Ie8 Analog Input Module Read

    4–4 Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter Word/Bit Descriptions for the 1794-IE8 Analog Input Module Read Decimal Bit Word Definition (Octal Bit) Bits 00-14 Channel 0 analog data - 12 bit left justified two's complement number; (00-16) unused lower bits are zero;...

  • Page 37: Range Selection Bits For The 1794 Ie8/B Analog Input Module

    Configuring Your Module and Reading Status from Your Module with a Remote I/O Adapter 4–5 Range Selection Bits for the 1794-IE8/B Analog Input Module Channel No. Channel 0 Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 Channel 7 Decimal Bits (Octal Bits)

  • Page 38: Output Analog Module (Cat. No. 1794 Oe4 Series B)

    4–6 Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter 4 Output Analog Module (Cat. No. 1794 OE4 Series B) I/O Image Module Image Input Size 0 or 1 Word Read Diagnostics Not used Analog Data Channel 0 Analog Data Channel 1 Analog Data Channel 2 Analog Data Channel 3...

  • Page 39: Range Selection Bits For The 1794 Oe4/B Analog Output Module (Word 5)

    Configuring Your Module and Reading Status from Your Module with a Remote I/O Adapter 4–7 Analog Output Module (1794-OE4/B) Write Configuration Block Word/Dec. Bit Word/Octal Bit Write Word 0 Analog Data - Channel 0 Word 1 Analog Data - Channel 1 Word 2 Analog Data - Channel 2 Word 3...
  • Page 40 4–8 Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter Decimal Bit Word Definition (Octal Bit) Bits 00-14 Channel 1 analog data - 12 bit left justified two's complement number; unused (00-16) lower bits are zero; 4 20mA uses all 16 bits. Word 1 Word 1 Bits 15 (17)

  • Page 41: Input/2 Output Analog Combo Module (Cat. No. 1794 Ie4Xoe2 Series B)

    Configuring Your Module and Reading Status from Your Module with a Remote I/O Adapter 4–9 4 Input/2 Output Analog Combo Module (Cat. No. 1794 IE4XOE2 Series B) Module Image I/O Image Input Data Channel 0 Input Size Input Data Channel 1 0 to 5 Words Read Input Data Channel 2...

  • Page 42: Analog Combo Module (1794 Ie4Xoe2/B) Write Configuration Block

    4–10 Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter Decimal Bit Word Definition (Octal Bit) Bits 00-14 Channel 3 analog data - 12 bit left justified two's complement number; (00-16) unused lower bits are zero; 4 20mA uses all 16 bits. Word 3 Word 3 Bits 15 (17)

  • Page 43: Range Selection Bits For The 1794 Ie4Xoe2/B Analog Combo Module

    Configuring Your Module and Reading Status from Your Module with a Remote I/O Adapter 4–11 Range Selection Bits for the 1794-IE4XOE2/B Analog Combo Module Channel No. Input Input Input Input Output Output Channel 0 Channel 1 Channel 2 Channel 3 Channel 0 Channel 1 Decimal Bits...

  • Page 44: Chapter Summary

    4–12 Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter Decimal Bit Word Definition (Octal Bit) Words 4 Not used - set to 0. and 5 Bits 00-14 Channel 0 Safe State analog value - 12 bit left justified two's complement number; (00-16) unused lower bits are zero;...

  • Page 45: How Communication Takes Place And I/O Image Table Mapping With The Devicenet Adapter

    Chapter How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter Chapter Objectives In this chapter you will learn about: DeviceNet Manager software I/O structure image table mapping factory defaults About DeviceNet Manager DeviceNet Manager is a software tool used to configure your FLEX I/O DeviceNet adapter and its related modules.

  • Page 46: Adapter Input Status Word

    5–2 How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter Adapter Input Status Word The input status word consists of: I/O module fault bits – 1 status bit for each slot node address changed – 1 bit I/O status –...

  • Page 47: Mapping Data Into The Image Table

    How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter 5–33 Mapping Data into the FLEX I/O analog modules are supported by the DeviceNet adapter. Image Table At present, these consist of: Module Description Catalog Number: For image table mapping refer to: 8 Input Analog Module 1794 IE8/B page 5-3...

  • Page 48: Analog Input Module (1794 Ie8/B) Write

    5–4 How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter Decimal Bit Size Octal Bit Read Words Analog Value Channel 7 Read Word 8 Not used - set to zero Read Word 9 Where: PU = Power up bit - included in series B modules only. U = Underrange bits for 4 20mA inputs S = sign bit (in 2's complement) Analog Input Module (1794-IE8/B) Write...
  • Page 49 How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter 5–5 Word Decimal Bit Definition Channel 4 analog data - 12 bit left justified two's complement Bits 00-14 number; unused lower bits are zero; 4 20mA uses all 16 bits. Read Word 5 Read Word 5 Bits 15...

  • Page 50: Output Analog Module (1794 Oe4 Series B) Image Table Mapping

    5–6 How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter 4 Output Analog Module (1794 OE4 Series B) Image Table Mapping I/O Image Module Image Input Size 0 or 1 Word Read Diagnostics Not used Analog Data Channel 0 Analog Data Channel 1 Analog Data Channel 2 Analog Data Channel 3...

  • Page 51: Range Selection Bits For The 1794 Oe4/B Analog Output Module (Write Word 6)

    How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter 5–7 Decimal Bit Size Octal Bit Read Words Write Words 7 Not used - set to 0 thru 14 Where: S = Sign bit (in 2's complement) OE = Output enable bits (bit 00 corresponds to output 0, bit 01 corresponds to output 1 and so on.
  • Page 52 5–8 How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter Word Decimal Bit Definition Output Enable bits. Bit 00 corresponds to input 0, bit 01 Bits 00-03 corresponds to input 1, bit 02 corresponds to input 2, and bit 03 Write Word 5 corresponds to input 3.

  • Page 53: Analog Combo Module (1794 Ie4Xoe2 Series B) Image Table Mapping

    How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter 5–9 Analog Combo Module (1794 IE4XOE2 Series B) Image Table Mapping Module Image I/O Image Input Data Channel 0 Input Size Input Data Channel 1 0 to 5 Words Read Input Data Channel 2 Input Data Channel 3...

  • Page 54: Analog Output Module (1794 Ie4Xoe2/B) Write

    5–10 How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter Analog Output Module (1794-IE4XOE2/B) Write Decimal Bit Size Octal Bit Read Words Analog Data - Output Channel 0 Write Word 1 Analog Data - Output Channel 1 Write Word 2 Not used - set to 0 OE1 OE0...
  • Page 55 How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter 5–11 Word Decimal Bit Definition Underrange bits (U) for individual channels (4 20mA current Bits 00-03 inputs only) - Bit 00 corresponds to input channel 0, bit 01 corresponds to input channel 1, and so on.

  • Page 56: Defaults

    5–12 How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter Defaults Each I/O module has default values associated with it. At default, each module will generate inputs/status and expect outputs/configuration. Module Defaults for: Factory Defaults Real Time Size Catalog Input Output...

  • Page 57: Specifications

    Appendix Specifications Specifications - 1794 IE8/B Analog Input Module Number of Inputs 8 single ended, non isolated Module Location Cat. No. 1794 TB2, TB3 Terminal Base Unit Resolution 12 bits unipolar; 11 bits plus sign bipolar Voltage 2.56mV/cnt unipolar; 5.13mV/cnt bipolar Current 5.13µA/cnt Data Format...
  • Page 58 A–2 Specifications Specifications - 1794 IE8/B Analog Input Module General Specifications External dc Power Supply Voltage 24V dc nominal Voltage Range 19.2 to 31.2V dc (includes 5% ac ripple) Supply Current 60mA @ 24V dc Dimensions Inches 1.8H x 3.7W x 2.1D (Millimeters) (45.7 x 94.0 x 53.3) Environmental Conditions...
  • Page 59 Specifications A–3 Specifications - 1794 OE4/B Analog Output Module Number of Outputs 4 single ended, non isolated Module Location Cat. No. 1794 TB2, TB3 Terminal Base Unit Resolution 12 bits plus sign Voltage 2.56mV/cnt Current 5.13µA/cnt Data Format left justified 16 bit 2's complement Conversion Type Pulse Width Modulation Conversion Rate...
  • Page 60 A–4 Specifications Specifications - 1794 OE4/B Analog Output Module General Specifications External dc Power Supply Voltage 24V dc nominal Voltage Range 19.2 to 31.2V dc (includes 5% ac ripple) Supply Current 70mA @ 24V dc (not including outputs) Dimensions Inches 1.8H x 3.7W x 2.1D (Millimeters) (45.7 x 94.0 x 53.3)
  • Page 61 Specifications A–5 Specifications - 1794 IE4XOE2/B 4 Input/2 Output Analog Combo Module Input Specifications Number of Inputs 4 single ended, non isolated Resolution 12 bits unipolar; 11 bits plus sign bipolar Voltage 2.56mV/cnt unipolar; 5.13mV/cnt bipolar Current 5.13µA/cnt Data Format left justified 16 bit 2's complement Conversion Type Successive approximation...
  • Page 62 A–6 Specifications Specifications - 1794 IE4XOE2/B 4 Input/2 Output Analog Combo Module Current Load on Voltage Output 3mA maximum Resistive Load on mA Output 15 750 ohms Absolute Accuracy Voltage Terminal 0.133% Full Scale @ 25 Current Terminal 0.425% Full Scale @ 25 Accuracy Drift with Temperature Voltage Terminal 0.0045% Full Scale/...

  • Page 63: Differences Between Series A And Series B Analog Modules

    Appendix Differences Between Series A and Series B Analog Modules The following lists major differences between series A and series B analog modules. Catalog Number Description Series A Series B 1794 IE8, Power Up bit in Read Word None This bit is set when all bits in the 1794 OE4, configuration register are 0 (unconfigured 1794 IE4XOE2...

  • Page 64: Data Table Formats

    Appendix Data Table Formats Two's Complement Binary Two’s complement binary is used when performing mathematical calculations internal to the processor. To complement a number means to change it to a negative number. For example, the following binary number is equal to decimal 22. 10110 = 22 First, the two’s complement method places an extra bit (sign bit) in...

  • Page 65: Analog Data Format

    C–2 Data Table Formats Analog Data Format The data returned from the analog-to-digital converter in the module is 12-bit resolute. This value is left-justified into a 16-bit field, reserving the most significant bit for a sign bit. 11 10 09 08 07 06 05 04 03 02 01 00 A/D Unipolar Data 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 Analog Value...

  • Page 66: Scaling Example

    Data Table Formats C–3 Scaling Example To scale your data to a different range: SLC 500 – use the scaling instruction. PLC-5 – determine a constant (slope) by dividing the desired range by the actual range. Multiply the result by your data, and add or subtract any offset.
  • Page 67 Index Symbols input range selection, **Empty**, P-1, P-2, 1-1, 1-2, 2-1, 3-6, communication, between module and Numbers adapter, configuration block, block transfer write 1794 IE4XOE2, specifications, 1794 IE8/B, 1794 IE8, specifications, 1794 OE4/B, 1794 OE4, specifications, configuring features, connecting wiring, 1794 IE4XOE2, 2-12 1794 IE8,...
  • Page 68 Index I–2 left justified data, 3-6, 4-2, range, selecting, range selection 1794 IE4XOE2, 4-11, 5-10 1794 IE8, 1794 OE4, mapping 1794 IE8/B, 1794 IE8, 1794 OE4/B, 1794 IE4XOE2, 1794 OE4, removing and replacing, under power (RIUP), 2-8, memory map - read 1794 IE4XOE2, 1794 IE8, 1794 OE4,...
  • Page 69 Allen Bradley Publication Problem Report If you find a problem with our documentation, please complete and return this form.
  • Page 70 FLEX I/O Analog Modules User Manual Pub. Name 1794 IE8, OE4, IE4XOE2 1794 6.5.2 May 1996 955122-66 Cat. No. Pub. No. Pub. Date Part No. Series B Check Problem(s) Type: Describe Problem(s): Internal Use Only Technical Accuracy text illustration Completeness procedure/step illustration definition...
  • Page 71 Other Comments PLEASE FOLD HERE NO POSTAGE NECESSARY IF MAILED IN THE UNITED STATES BUSINESS REPLY MAIL FIRST-CLASS MAIL PERMIT NO. 18235 CLEVELAND OH POSTAGE WILL BE PAID BY THE ADDRESSEE TECHNICAL COMMUNICATION 1 ALLEN BRADLEY DR MAYFIELD HEIGHTS OH 44124-9705...

  • Page 72: Support Services

    Support Services At Allen-Bradley, customer service means experienced representatives at Customer Support Centers in key cities throughout the world for sales service and support. Our value-added services include: Technical Support SupportPlus programs telephone support and 24-hour emergency hotline software and documentation updates...

This manual is also suitable for:

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