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Rockwell Automation 1771-OFE User Manual
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Rockwell Automation 1771-OFE User Manual

Rockwell Automation 1771-OFE User Manual

Analog output module
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Allen Bradley
Analog Output
Module
(Cat. No. 1771 OFE Series B)
User
Manual

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Summary of Contents for Rockwell Automation 1771-OFE

  • Page 1 Allen Bradley User Analog Output Module Manual (Cat. No. 1771 OFE Series B)
  • Page 2 Important User Information Because of the variety of uses for the products described in this publication, those responsible for the application and use of this control equipment must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements, including any applicable laws, regulations, codes and standards.
  • Page 3 Summary of Changes Summary of Changes Summary of Changes This release of the publication contains updated information from the last release. Updated Information This publication covers the Series B version of the Analog Output module.In addition, this version of the manual contains information formally included in publication 1771-6.5.30–RN1, dated December 1995.
  • Page 4 SOC-2 Summary of Changes Publication 1771 6.5.30 - November 1998...
  • Page 5 Vocabulary In this manual we refer to the: Analog Output Module (cat. no. 1771-OFE) as the “output module” Programmable Controller as the “processor” or “controller.” Manual Organization The manual is divided into seven chapters.
  • Page 6 For more information on your programmable controllers, contact your nearest Allen-Bradley office. Product Compatibility The 1771-OFE module can be used with any 1771 I/O chassis. Communication between the discrete analog module and the processor is bidirectional; the processor block-transfers output data through the output image table to the module and block-transfers input data from the module through the input image table.
  • Page 7 Table of Contents Overview of the Analog Chapter 1 Output Module Chapter Objectives ........Module Description .
  • Page 8 Table of Contents Module Programming Chapter 4 Chapter Objectives ........Block Transfer with the Analog Output Module .
  • Page 9 Table of Contents Specifications Appendix A Specifications ........Block Transfer with Appendix B Mini PLC 2 and PLC 2/20...
  • Page 10 Table of Contents Publication 1771 6.5.30 - November 1998...
  • Page 11 Controllers ........About the Analog Output The Analog Output Module (cat. no. 1771-OFE) is an intelligent Module...
  • Page 12 Module Features In the programmable controller system, the analog output module provides the following functions: four individually isolated differential outputs selectable scaling to engineering units selectable data format selectable voltage ranges (1771-OFE1 only) no external power required--power is drawn from the 1771 I/O chassis backplane.
  • Page 13 How Analog Modules The processor transfers data to the module (block transfer write) and Communicate with from the module (block transfer read) using BTW and BTR Programmable Controllers instructions in your ladder diagram program. These instructions let the processor send output values to the module, establish the module’s mode of operation (see illustration below) and receive status information from the module.
  • Page 14 Publication 1771 6.5.30 - November 1998...
  • Page 15 Chapter Module Installation What This Chapter In this chapter, you will read about: Contains For information on See page Compliance to European Union Objectives ....Calculate the Power Requirements ....Set Module Configuration Jumpers .
  • Page 16 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 Automation Systems Catalog, publication B111 This equipment is classified as open equipment and must be mounted in an enclosure during operation to provide safety protection.
  • Page 17 Determine Module You can place your module in any I/O module slot of the I/O chassis Location in the I/O Chassis with the following guidelines: Do not put the module in the same module group as a discrete high-density module. Avoid placing output modules close to ac modules or high-voltage dc modules.
  • Page 18 MIN, MID on the module’s circuit board (Figure 2.1). If you do not place configuration jumpers in one of these positions, the module defaults to the HOLD LAST VALUE setting. Figure 2.1 shows jumper positions for the 1771-OFE, Series B, Analog Output Module LAST STATE Configuration Jumpers. Important: Ignore the MAX, MIN, MID markings on the printed circuit board.
  • Page 19 Figure 2.1 LAST STATE Configuration Jumper Last State Output Level Configuration Jumpers Front of Circuit Board HOLD LAST STATE Table 2.A lists the output ranges and their minimum, maximum, and middle values. Table 2.A Output Last State Configuration Values Output Range Minimum Maximum Middle Value...
  • Page 20 Rack switch 1 determines what output conditions occur during a rack fault. Configuration Jumper Setting Rack Switch 1 S tti Setting HOLD LAST STATE Last State Last State Last State Last State Last State Reset Last State To set the last state configuration jumpers, proceed as follows. ATTENTION: Do not insert modules into or remove modules from the I/O chassis while system power is ON.
  • Page 21 Figure 2.3 Configuration Jumper Locations Configuration Desired Voltage Range Output Jumper Channel 0-10V 1-5V Location LAST STATE P3, Jumper P5, Jumper P7, Jumper P9, Jumper (side view of jumper) Install the Keying Bands Position the keying bands in the backplane connectors to ATTENTION: Observe the following correspond to the key slots on the module.
  • Page 22 Install the Module and Field Wiring Arm ATTENTION: Remove power from the 1771 I/O chassis backplane and field wiring arm before removing or installing an I/O module. Failure to remove power from the backplane or wiring arm could cause module damage, degradation of performance, or injury.
  • Page 23 Connect the Wiring The analog devices connect to the analog module through a field wiring arm (cat. no. 1771-WC). The field wiring arm pivots on the front of the I/O chassis to connect with the module. You can remove the module from the chassis without disconnecting user wiring because wiring connections are made on the field wiring arm.
  • Page 24 2-10 The module requires shielded cable for signal transmission to the analog devices. Use Belden 8761 shielded cable, which consists of a single insulated, twisted-pair of conductors, covered along their entire length by a foil shield and encased in plastic. The shield reduces the effect of induced noise at any point along the cable.
  • Page 25 2-11 Interpreting the Indicator The front panel of the module contains a green RUN and a red FLT Lights (fault) indicator. At power-up, the red FLT indicator lights and remains ON during an initial module self-check. If a fault is found initially or occurs later, the red FLT indicator stays lit.
  • Page 26 2-12 Publication 1771 6.5.30 - November 1998...
  • Page 27 Chapter Configuring Your Output Module What This Chapter In this chapter, you will read about: Contains For information on See page Configuring Your Module ......Configuration Word .
  • Page 28 Note: Programmable controllers that use 6200 software programming tools can take advantage of the IOCONFIG utility to configure this module. IOCONFIG uses menu-based screens for configuration without having to set individual bits in particular locations. Refer to your 6200 software literature for details. Programmable controllers that use process configuration and operation software (cat.
  • Page 29 Configuration Word Word 5 of the block transfer write is the module configuration word (Figure 3.1). It contains information on: data polarity scaling polarity data format Figure 3.1 Configuration Block Transfer Write Word 5 Word/Dec. Bit Word/Octal Bit Word 5 1 = Channel 1 2 = Channel 2 Data Format...
  • Page 30 Decimal Bit Word Description (Octal Bit) When set (1), indicates negative maximum scaling value for Channel 3. When 09 (11) reset (0), indicates positive maximum scaling value for channel 3. When set (1), indicates negative minimum scaling value for Channel 4. When 10 (12) reset (0), indicates positive minimum scaling value for channel 4.
  • Page 31 Some examples of how to determine the value of the data word needed to produce the desired output voltage or current follow: Example 1 Output Range 4 20mA Data Format BCD (0 4095) Desired Output 9.5mA D I/Bit 0.0039mA/Bit (from Table 3.B) Remember, 4mA corresponds to scale minimum (9.5mA 4mA) @ 1410 (decimal) = 0001 0100 0001 0000 (BCD)
  • Page 32 Scaling Scaling is the conversion of unscaled data to engineering units--such as gallons/minute, degrees centigrade, and pounds/square inch. You can use the scaling feature to send the data for each channel to the module in an optional scaled value representing actual engineering units.
  • Page 33 The largest value that you can enter for a maximum scaling value is 9999. The smallest value you can enter for a minimum scaling value is -9999 (the minus sign is implemented by setting the appropriate bit in the configuration word). Important: The maximum scale value must be larger than the minimum scale value.
  • Page 34 If you do not wish to scale a particular channel, set the scaling values as shown below. Set Maximum Set Minimum If your range is: Scaling Value to: Scaling Value to: 4 20mA 1 5V 4095 0000 0 10V +10 to 10V 4095 4095 This also requires you to set the appropriate sign bit in the configuration word for the minimum...
  • Page 35 Procedure for Configuring Now that we have explained the purpose and function of each word Your Module in the block transfer write block, you should be ready to enter configuration data. Consult your programming manuals for the proper techniques required to set up block transfer instructions with your programmable controller.
  • Page 36 3-10 Publication 1771 6.5.30 - November 1998...
  • Page 37 Chapter Module Programming What This Chapter In this chapter you will read about: Contains For information on See page Block Transfer with the Analog Output Module ... . Block tTansfer Programming Formats ....Block tTansfer Programming Formats - PLC-2 Family Processors only .
  • Page 38 Block Transfer Output data is transferred from the processor’s data table to the Programming PLC 2 module with a write block transfer. Diagnostic information is Family Processors Only transferred from the module to the processor’s data table with a read block transfer.
  • Page 39 PLC-2 Family Example Program Module Location Rack 1, Module Group 0, Slot 1 030 for Block Transfer Write T/C Addresses 031 for Block Transfer Read BTW File (Configuration file) 0200 0214 BTR File (Buffer file) 0300 0304 Output Data File 0400 0404 Storage Bit 050/00...
  • Page 40 Table 4.A Data Table Map Allen Bradley Programmable Controller PAGE Data Table MAP (128 word) ADDRESS PROJECT NAME PROCESSOR OFE Data Table–Write Block PLC-2 Family DESIGNER DATA TABLE SIZE STARTING WORD ADDRESS STARTING WORD ADDRESS BIT NUMBER BIT NUMBER DESCRIPTION DESCRIPTION 10 07 10 07...
  • Page 41 Table 4.B PLC 2 Family Data Table Word ALLEN-BRADLEY Programmable Controller DATA TABLE WORD ASSIGNMENTS (64-WORD) PAGE ADDRESS PROJECT NAME PROCESSOR OFE PROGRAM PLC-2 FAMILY & PLC-3 DESIGNER DATA TABLE SIZE WORD ADDR DESCRIPTION WORD ADDR DESCRIPTION CH 1 DATA CH 2 DATA CH 3 DATA CH 4 DATA...
  • Page 42 Figure 4.3 Binary Configuration Word Represented in BCD Channel 3 Minimum Scaling Factor Polarity Set (1) = Negative Reset (0) = Positive Word/Dec. Bit Word/Octal Bit Word 5 Binary 12892 Block Transfer Block transfer operation with the PLC-3 processor uses one binary Programming PLC 3 file in a data table section for module location and other related data.
  • Page 43 Figure 4.4 PLC 3 Sample Program Structure Program Action Upon completion of a successful read block transfer, data from the module is moved from the buffer file (block transfer read file) to a storage data file. This prevents the module from using invalid data should block transfer communications fail. At power up, the program performs a write block transfer that configures the module.
  • Page 44 The second is a read/write program. Important: If the 1771-OFE module is configured in BCD data format and you are using a PLC-5 processor, extra programming will have to be added to the ladder program (i.e.
  • Page 45 Figure 4.6 PLC 5 Example Program 1 Program Action (Example 1) BLOCK XFER WRITE Rung 1 N10:0 Rack Address: The BTW is writing in an Group Address: as fast as possible" mode. As soon as Module Address: the instruction executes, it is reenabled for Control Block: N10:0 another transfer.
  • Page 46 4-10 Other Programming When writing your program, there are some additional programming Considerations techniques that you should consider. They are: block length and scaling considerations block transfer boundary word - PLC-2 family processors module update time buffering data - PLC-2 family processors only system expansion recommendations Block Length and Scaling Considerations There are three possible write block configurations that involve...
  • Page 47 4-11 All Four Channels Scaled To scale all four channels, enter a block length of 00 and enter the appropriate scaling values for the four channels, as shown in the following table. And Channel Is If You Want Then Enter: Configured for: +10V, 0 10V,...
  • Page 48 4-12 Figure 4.8 Data Table Structure and GET/PUT Instruction Example for Block Transfer Boundary Word 030 First Block Transfer Data Address 035 Last Block Transfer Data Address 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 036 Address of Block Transfer Boundary W Timer/Counter 037 Beginning Address for Timer/Counter S...
  • Page 49 4-13 Module Update Time Update time is defined as the amount of time it takes for the output module to receive a block transfer scan and update all output channels. Refer to Figure 4.9. The output module updates the four output channels in: 8 milliseconds when BCD data format and scaling are used 1.6 milliseconds when binary data format and no scaling are used...
  • Page 50 4-14 Publication 1771 6.5.30 - November 1998...
  • Page 51 Chapter Module Status and Input Data What This Chapter In this chapter, you will read about: Contains For information on See page Reading Data from the Module ..Reading Data from the Block transfer read (BTR) programming moves status and data from Module the module to the processor’s data table in one I/O scan.
  • Page 52 Table 5.A Bit/Word Description for Block Transfer Read Decimal Bits Word Description (Octal Bits) Bits 00 15 Channel 1 DAC input data. (00 17) Bits 00 15 Channel 2 DAC input data. (00 17) Bits 00 15 Channel 3 DAC input data. (00 17) Bits 00 15 Channel 4 DAC input data.
  • Page 53 Chapter Calibrating Your Output Module Chapter Objectives In this chapter, you will read how to calibrate your output module. For information on See page Tools and test equipment ......Calibrating your module .
  • Page 54 Voltage Output Version Preparation for Calibration - (1771 OFE1) 1. Turn off the processor and I/O chassis power. 2. Remove the field wiring arm. 3. Remove the analog output module from the I/O chassis. 4. Remove the module covers. 5. Connect the backplane extender card (cat. no. 1771-EX) to the circuit board.
  • Page 55 6. Connect the voltmeter leads across the top two screws on the field wiring arm (Channel 1). The top screw is positive, and the second (lower) screw is negative. 7. Turn on the processor, I/O chassis, and the industrial terminal. Figure 6.1 Resistor Placement on Field Wiring Arm Field Wiring Arm...
  • Page 56 Figure 6.3 Location of Configuration Jumpers and Resistor Pots LAST STATE TP10 TP12 Configuration Jumpers (set for +10V scale) Channel 0 R67 R66 Channel 1 Resistor Potentiometers Adjustment Screws Channel 2 R81 R80 Channel 3 R88 R87 12993 8. Place the processor in the TEST or PROG mode. 9.
  • Page 57 15.Reconnect the voltmeter to the appropriate screws on the field wiring arm. Repeat Steps 9 through 14 for Channels 2, 3, and 4, until you obtain the desired tolerance. Table 6.B lists the appropriate resistor pots for each channel. Table 6.B Resistor Pots Channel Resistor Pots...
  • Page 58 Channel Calibration 1. Disconnect your analog device wires from the module’s field wiring arm. Important: If you have a spare or unused field wiring arm, you may want to temporarily switch it with the module’s present field wiring arm. You can use this spare arm for test purposes in order to avoid disconnecting your analog device wires.
  • Page 59 4. Place the LAST STATE configuration jumpers (Figure 6.5) in the MAX position (if they are not there already). Figure 6.5 LAST STATE Configuration Jumpers in MAX Position LAST STATE Printed Circuit Board Top View Front Position plugs as required. Mod- Hold last state 11919 I...
  • Page 60 Figure 6.6 Location of Resistor Pots LAST STATE TP10 TP12 Configuration Jumpers (set for +10V scale) Channel 0 R67 R66 Channel 1 Resistor Potentiometers Adjustment Screws Channel 2 R81 R80 Channel 3 R88 R87 12993 12.Output full scale (+20mA) again, either with write block transfer data or by placing the LAST STATE configuration jumpers in the MAX position.
  • Page 61 15.Remove the extender card and return the circuit board to the module. 16.Replace the LAST STATE configuration jumpers to their original position. 17.Replace the module covers. 18.Return the module to the I/O rack. 19.Replace your analog device wires (or the original field wiring arm if you used a spare for calibration procedures).
  • Page 62 6-10 2. Attach 250 ohm resistor across Channel 1 (the top two screws) on the field wiring arm. Figure 6.7 Resistor Placement on Field Wiring Arm Channel 1 Channel 2 250 ohm resistors Channel 3 Channel 4 Field Wiring Arm 12991 3.
  • Page 63 6-11 Table 6.D Resistor Potentiometers Channel Resistor Potentiometer 11. Remove the extender card and circuit board from chassis. 12.Replace Last State configuration jumpers to their original position. 13.Replace the module covers and insert the module into the I/O chassis. 14.Replace field wiring on field wiring arm (or position original wiring arm on module if you used a spare field wiring arm for this calibration procedure).
  • Page 64 6-12 Publication 1771 6.5.30 - November 1998...
  • Page 65 Chapter Diagnostics and Troubleshooting Chapter Objectives In this chapter, you will read how to troubleshoot your output module using indicator lights and diagnostic bits. For information on See page Interpreting the indicator lights ..... . . Read Block Transfer words .
  • Page 66 Table 7.A Troubleshooting Chart Condition Possible Cause Recommended Action Green RUN indicator does not No Power to Module Check I/O chassis for power. come on. Bad internal fuse Turn off power to I/O chassis. Remove and reinsert module into chassis. Return power to I/O chassis.
  • Page 67 The fifth word contains the status of each DAC word; that is, whether data is out of range or scaling is improperly programmed. The fifth word also indicates that I/O RESET has been established (when the processor is in the PROG/TEST or RUN mode). Word Bits Description...
  • Page 68 Publication 1771 6.5.30 - November 1998...
  • Page 69 Appendix Specifications Outputs per Module 4 Individually Isolated Module Location Bulletin 1771 I/O Chassis - One Slot Output Voltage Ranges (Nominal) - +1 to +5V DC 1771 OFE1 -10 to +10V DC 0 to +10V DC Output Current (maximum) 10mA per Channel in Voltage Mode (1771-OFE1) Output Current Ranges (Nominal) +4 to +20mA (1771-OFE2) 0 to +50mA (1771-OFE3)
  • Page 70 Environmental Conditions Operational Temperature: C to +60 C (+32 F to +140 Storage Temperature: C to +85 C (-40 F to +185 Humidity Rating: 5% to 95% (Non-Condensing) Field Wiring Arm Catalog No. 1771 WC Field Wiring Arm Screw Torque 7 9 pound inches (0.6-1.1Nm) Agency Certification CSA certified...
  • Page 71 Appendix Block Transfer with Mini PLC 2 and PLC 2/20 Processors Multiple GET Instructions Programming multiple GET instructions is similar to block format instructions programmed for other PLC-2 family processors. The data table maps are identical, and the way information is addressed and stored in processor memory is the same.
  • Page 72 Rungs 2 and 3 These OUTPUT ENERGIZE instructions (012/01 and 012/02) define the number of words to be transferred. This is accomplished by setting a binary bit pattern in the module’s output image table control byte. The binary bit pattern used (Bits 01 and 02 energized) is equivalent to six words or channels and is expressed as 110 in binary notation.
  • Page 73 Setting the Block Length The output module is capable of transferring up to 13 words in one (Multiple GET Instructions program scan. The number of words transferred is determined by the Only) block length entered in the output image table control byte. The bits in the output image table control byte (Bits 00-05) must be programmed to specify a binary value equal to the number of words to be transferred.
  • Page 74 Publication 1771 6.5.30 - November 1998...
  • Page 75 Appendix Data Table Formats 4 Digit Binary Coded The 4-digit BCD format uses an arrangement of 16 binary digits to Decimal (BCD) represent a 4-digit decimal number from 0000 to 9999 (Figure C.1). The BCD format is used when the input values are to be displayed for operator viewing.
  • Page 76 Table C.A BCD Representation Place Value Decimal Equivalent Signed magnitude Binary Signed-magnitude binary is a means of communicating numbers to your processsor. It should be used with the PLC-2 family when performing computations in the processor. It cannot be used to manipulate binary 12-bit values or negative values.
  • Page 77 Two's Complement Binary Two’s complement binary is used with PLC-3 processors 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 78 Publication 1771 6.5.30 - November 1998...
  • Page 79 Table of Contents Default Block Length, 4-10 Defaults, module, 3-4 Block Length, Default, 4-10 Diagnostics, 4-2, 7-1 Block Length, Setting, 4-10 Block Transfer Boundary Word, 4-11 Multiple GET Instructions, B-1 Fault Indicator LED, 2-12, 7-1 Programming Formats, 4-1 Read, 4-2 Features, 1-2 Write, 4-2, 4-7, 4-8, 4-9 Field Wiring Arm, 2-10, 6-1, 6-6, 6-9...
  • Page 80 Table of Contents I–2 Polarity Test Equipment, 6-1 Data, 4-10 Troubleshooting, 7-2 Scaling, 3-6 power requirements, 2-2 pre-installation considerations, 2-2 Update Time, 4-13 Preparation for Calibration, 6-1, 6-5, 6-9 Programming Formats, Block Transfer Multiple GET Instructions, PLC-2, -2/20, PLC-2 Family Processors, 4-2 voltage output version, 2-3 PLC-3 Family Processors, 4-6 voltage range configuration plugs, 2-6...
  • Page 81 Allen Bradley Publication Problem Report If you find a problem with our documentation, please complete and return this form. Analog Output Module User Manual Pub. Name 1771-OFE/B 1771-6.5.30 November 1998 955124-45 Cat. No. Pub. No. Pub. Date Part No. Check Problem(s) Type:...
  • Page 82 PLEASE FASTEN HERE (DO NOT STAPLE) 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 1 ALLEN BRADLEY DR MAYFIELD HEIGHTS OH 44124-9705 Publication 1771 6.5.30 - November 1998...
  • Page 83 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 technical subscription services Engineering and Field Services application engineering assistance...
  • Page 84 Allen Bradley, a Rockwell Automation Business, has been helping its customers improve productivity and quality for more than 90 years. We design, manufacture and support a broad range of automation products worldwide. They include logic processors, power and motion control devices, operator interfaces, sensors and a variety of software. Rockwell is one of the world's leading technology companies.

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