1 U C N E Because of the variety of uses for the products described in thispublication, those responsible for the application and use of this controlequipment must satisfy themselves that all necessary steps have been takento assure that each application and use meets all performance and safetyrequirements, including any applicable laws, regulations, codesand illustrations, charts, sample programs and layout examples shown inthis guide are intended solely for example. Since there are many variablesand requirements associated with any particular installation, Allen-Bradleydoes not assume responsibility or liability (to include intellectual propertyliability) for actual use based upon the examples shown in this publication , Safety Guidelines For TheApplication, Installation and Maintenance of Solid State Control (available from your local Allen-Bradley office)
2 Describes some importantdifferences between solid-state equipment and electromechanical deviceswhich should be taken into consideration when applying products such asthose described in this of the contents of this copyrighted publication, in whole orin part, without written permission of Allen-Bradley Company, this Manual we make notes to alert you to possible injury topeople or damage to equipment under specific : Identifies information about practices orcircumstances that can lead to personal injury or death, propertydamage or economic helps you: Identify a hazard. Avoid the hazard. Recognize the : Identifies information that is especially important forsuccessful application and understanding of the : We recommend you frequently backup your applicationprograms on appropriate storage medium to avoid possible data mm n sP 77 8 mm n sThis release of the publication contains updated information from thelast publication covers the Series B version of the Analog addition, this version of the Manual contains informationformally included in publication RN1, dated revised circuit board layout has the configuration jumpersrelocated from previous versions.
3 Access holes are included in theside cover so that covers no longer have to be removed to adjust thejumpers or Module also contains information on Compliance to EuropeanUnion Directives. ChangeBarsTo help you find new and updated information in this release of thepublication, we have included change bars as shown to the right ofthis SOC-2 Summary of ChangesP 77 8 PrefacePublication 1771 - November 1998 PrefaceThis Manual shows you how to use the Analog Output Module with anAllen-Bradley programmable controller. It describes methods forinstalling, programming, calibrating, and troubleshooting make efficient use of your Module , you must be able to programand operate an Allen-Bradley programmable controller. Inparticular, you must be able to program block transfer this Manual we assume that you know how to do this.
4 If you donot, refer to the appropriate programming and operations Manual forthe processor that you are this Manual we refer to the: Analog Output Module (cat. no. 1771-OFE) as the outputmodule Programmable Controller as the processor or controller. The Manual is divided into seven chapters. The following chartshows each chapter with its corresponding title and a brief overviewof the topics covered in that of the Analog OutputModuleDescription of the Module , including general andhardware features. How modules communicate withprogrammable controllers2 Module InstallationPower requirements, keying, Module location and hard ware configuration3 Module ConfigurationSoftware configurations, Output range selection, dataformat and data scaling4 Module ProgrammingWriting data to the Module , and other programmingconsiderations (default block length, block transferboundary word, and watchdog timer)
5 5 Module Status and Input DataReading data from the module6 Calibrating Your Output ModuleCalibration procedures7 Diagnostics and TroubleshootingTroubleshooting Guide for problem diagnosisManual'sPurposeAudienceVocabula ryManualOrganization PrefaceP 2 Publication 1771 - November 1998 AppendicesTitleASpecificationsBBlock Transfer with Mini PLC 2 and PLC 2/20 ProcessorsCData Table FormatsYou can install your Output Module in any system that usesAllen-Bradley programmable controllers that have block transfercapabilities and the 1771 I/O more information on your programmable controllers, contactyour nearest Allen-Bradley 1771-OFE Module can be used with any 1771 I/O between the discrete Analog Module and theprocessor is bidirectional; the processor block-transfers Output datathrough the Output image table to the Module and block-transfersinput data from the Module through the input image table.
6 Themodule also requires an area in the data table to store the read blocktransfer data and write block transfer data. I/O image table use is animportant factor in Module placement and addressing and data table use is listed in the following and Use of Data TableUse of Data TableCompatibilityCatalogNumberInputImag eOutputImageReadBlockWriteBlockAddressin gChassisImageBitsImageBitsBlockWordsBloc kWords1/2 Slot1 Slot2 SlotSeries1771 OFE88513 YYYA, BA = Compatible with 1771 A1, A2, A4B = Compatible with 1771 A1B, A2B, A3B, A3B1, A4BY = Compatible without restriction. You can place your Module in any I/O Module slot of the I/Ochassis. You can put two Output modules in the same Module group. Do not put the Module in the same Module group as a discretehigh density Module . Avoid placing Output modules close to ac modules or high voltagedc a list of publications with information on Allen-Bradleyprogrammable controller products, consult our publication index(SD499).
7 Related ProductsProduct CompatibilityRelated PublicationsPublication 1771 - November 1998 Chapter1 Chapter Analog Modules Communicate with Programmable Controllers toEuropean Union Voltage You Install Your Analog Power Module Location in the I/O Module Configuration Output Output State Configuration Voltage Range Configuration Jumpers (1771 OFE1 only) the Analog the Indicator Your Value and Minimum Scaling for Configuring Your bleof ontentsOverviewoftheAnalogOutputModuleMo duleInstallationModuleConfigurationTable of ContentsiiPublication 1771 - November 1998 Chapter4 Chapter Transfer with the Analog Output Transfer Programming Transfer Programming PLC 2 Family Processors Transfer Programming PLC 3 Family Processors Transfer Programming PLC 5 Family Processors Programming Length and Scaling Transfer Boundary Word PLC 2 Family Processors Only Update Expansion Recommendations PLC 2 Processors Data from the and Test Your Output Version (1771 OFE1) Output Version (1771 OFE2) Output Version(1771 OFE3)
8 The Indicator Block Transfer Status of ContentsiiiPublication 1771 - November 1998 Appendix BMultiple GET 2 and the Block Length (Multiple GET Instructions Only) C4 Digit Binary Coded Decimal (BCD) magnitude 's Complement Transfer withMini PLC 2 and PLC 2/20 ProcessorsData Table FormatsTable of ContentsivP 77 8Ch pt r1 Publicatio n 77 6 5 3 November 998 OverviewoftheAnalogOutputModuleRead this chapter to familiarize yourself with the Analog the Module Module Features 2 Output Ranges 2 How Analog Modules Communicate with ProgrammableControllers 3 The Analog Output Module (cat. no. 1771-OFE) is an intelligentblock transfer Module that converts binary or four-digit BCD values(supplied by your processor) to Analog signals at its four moduleoutputs. The Module accomplishes the data transfer with blocktransfer transfer write (BTW) programming moves up to 13 words ofdata from the processor to the Module for digital to Analog (D/A)conversion in one program scan.
9 This information is converted toanalog signals and is sent to the appropriate Output block transfer read (BTR) moves five words of data from themodule to the processor data table, if desired, for diagnosticpurposes. The BTR is discussed in Chapter 7, Diagnostics andTroubleshooting. The Module has a scaling feature that converts data sent to themodule in engineering units to the proper Analog may connect up to four Analog Output devices--such as valvepositioners, motor speed controllers, signal converters orrecorders--to the Analog Output Module s four channels. All analogoutput device inputs should conform to the voltage or current ratingsof each Module Output 1-2 Publication 1771 - November 1998 ModuleFeaturesIn the programmable controller system, the Analog Output moduleprovides 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/Ochassis backplane.
10 Requires only one I/O slotOutputRangesThere are three versions of the Analog Output Module :CatalogNumberModuleOutputOutputRa nge1771 OFE1 Voltage1 5V dc0 10V dc+10V dcSelected byconfigurationjumpers1771 OFE2 Current4 20mAFactory set1771 OFE3 Current0 50mAFactory setThe voltage version (1771-OFE1) voltage Output range is selectedwith configuration jumpers in the Module :Note: The 1771-OFE1 is shipped with the selection jumpers inthe +10V current Output versions (1771-OFE2 and -OFE3) are factory set. 1-3 Publication 77 6 5 3 November 998 The processor transfers data to the Module (block transfer write) andfrom the Module (block transfer read) using BTW and BTRinstructions in your ladder diagram program. These instructions letthe processor send Output values to the Module , establish themodule s mode of operation (see illustration below) and receivestatus information from the + 213To Analog Output devicesBTWP rogrammableControllerAnalog Output ModuleCat No 77 OFE processor transfers your configuration and Output data to themodule via a block transfer write Module converts the data into proportional voltage or Module outputs drive external Analog instructed by your ladder program, the processor performsa read block transfer of Output values and Module processor and Module determine that the transfer was madewithout ladder program can use and/or move the data (if valid)