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Allen Bradley PLC 5 1785-KA3

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1785-KA3

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The Allen-Bradley 1785-KA3 module is a PLC 2 series communication adapter module and an interface module. Its backplane current rating is 1.2 Amps at 5 Volts DC. The 1785-KA3 communication and interface module allows a PLC 2 programmable controller to communicate with other devices over the Data Highway Plus network. This communication adapter module needs to be installed in a slot in an Allen-Bradley Bulletin 1771 I/O chassis. The 1785-KA3 communication and interface module draws its 1.2 Amps of required backplane current from the Bulletin 1771 I/O chassis.

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Rockwell Disclaimer: The product is used surplus. DO Supply is not an authorized surplus dealer or affiliate for the Manufacturer of this product. The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because DO Supply is not an authorized distributor of this product, the Original Manufacturer's warranty does not apply. While many Allen-Bradley PLC products will have firmware already installed, DO Supply makes no representation as to whether a PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. DO Supply also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from Rockwell, its distributors, or any other source. DO Supply also makes no representations as to your right to install any such firmware on the product. DO Supply will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.

Technical specifications for 1785-KA3

ManufacturerAllen Bradley
CategoryPLCs
Product LinePLC 5
Part Number1785-KA3
Weight1.88 lbs (0.85 kg)
Module TypeCommunication Adaptor Interface Module
Backplane Requirement1.2 Amperes at 5 Volts DC
Interface PortsData Highway, Data Highway Plus, and Allen-Bradley Industrial Terminal (Series 1784)
OperationProcess Messages
Communication w/ PLC ProcessorDirect Connection to Channel 3 of PLC-5 Processor
LEDs1 Diagnosis/Status Per Channel
Max Modules Per System4
CoatingConformal Coat
Required External PowerNone
Typical AC Signal Delay (Off)29 (+/- 8) ms
Typical DC Signal Delay (Off)30 (+/- 7) ms
Wiring Arm1771-WN
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The 1785-KA3 PLC-2 Family Communication Adapter Module by Allen Bradley is a communication adapter installed on any slot (except the furthest left) of the 1771 I/O chassis, which links the PLC-2 family processors to a Data Highway Plus (DH+) Network. The 1785-KA3 draws 1.2 A backplane current at 5 Volts DC. It has an interface port for connection to the PLC-2 Programmable Controller using the Data Highway Plus Processor cable and a Data Highway Plus drop-line, and for connection to the 1784-T50 Industrial Workstation using the Program Panel Interconnect Cable.

The 1785-KA3 has 3 sets of switches: the Data Highway Plus baud rate switch assembly, the write options switch assembly and the node address group switch. These switches determine the mode of connection with other nodes on the network.

This unit supports most PLC-2 family processors, and the module is keyed to the backplane by connecting the band between pins 4 and 6, 22 and 24 of the top connector. Its temperature range is between 0 and 60 degrees Celsius (32 to 140 degrees Fahrenheit) at 5% to 95% non-condensing relative humidity; its storage temperature is between -40 to 85 degrees Celsius (-40 to 185 degrees Fahrenheit).

Revision Part #Also known as
1785-KA3 Ser A1785-KA3/A, Series A, Rev A
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