Allen-Bradley 1771-KA

An Allen-Bradley Data Highway extends the capabilities of programmable controllers by letting them exchange data with each other and with other intelligent RS-232-C devices. Data Highway integrates individual controllers into a larger automated manufacturing network. On a single Data Highway cable, as many as 64 separate programmable controllers and computers can be connected over a distance of 10,000 feet (3,048m).

The unit that interfaces PLC-2 family programmable controllers to this network, and makes communication possible, is an A-B Communication Adapter Module (cat. no. 1771-KA2). (See Figure 1.1) It is a Data Highway station interface module and is used with Bulletin 1772 programmable controller processors. These processors are:PLC-2 Processor (cat. no. 1772-LR)
PLC-2/20 Processor (cat. no. 1772-LP1, -LP2)
PLC-2/30 Processor (cat. no. 1772-LP3)
Mini-PLC-2 Processor (cat. no. 1772-LN1, -LN2, -LN3)
Mini-PLC-2/05 (cat. no. 1772-LS, LSP)
Mini-PLC-2/15 (cat. no. 1772-LV)


This module enables communication of memory data between these processors, and from any of these processors to other processors on the Data Highway via communication adapter modules.

Here are some of the KA2's features:
New commands have been added to the 1771-KA2 that simplify upload and download procedures.
A KA2 lets you to change (remotely) the size of the PC data table. (New with 1772-KA2 module.)
It has second module or "daisy chain" capability. (New with 1772-KA 2 module.)
Uses ladder diagram instructions for ease of programming. Offers memory write protection through programming and switch selection.
Controls communication without need for a host computer.
Has automatic error checking of data it receives.
Has self-checking diagnostics.
Shows status and diagnostics with LED indicators and error codes.
Controls DONE and REMOTE/LOCAL FAULT memory bits as status
and diagnostic indicators.Automatically re-tries messages.Automatically recovers from master station fault condition.Has selectable priority levels for commands.Is compatible with industrial terminal system.