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Copy| Product Name | Allen-Bradley 1772-LP1 PLC-2/20 Programmable Controller |
| Item NO. | 2909025 |
| Weight | 0.1 kg = 0.2205 lb = 3.5274 oz |
| Category | AB |
| Brand | ALLEN-BRADLEY |
| Creation Time | 2026-09-16 |
Allen-Bradley · Bulletin 1772 processor
PLC-2/20 processor for Bulletin 1772 systems with Data Highway, Remote I/O and RS-232-C interfaces.
The Allen-Bradley 1772-LP1 is identified as a PLC-2/20 programmable controller processor in the Bulletin 1772 family. Its role is processor-level control within a PLC-2 system rather than a stand-alone I/O device, and the documented system options place it alongside PLC-2 communications and distributed I/O hardware.
When a Bulletin 1772 system is connected to an Allen-Bradley Data Highway, the processor works with a 1771-KA2 Communication Adapter Module. That arrangement allows the controller to participate in a network that exchanges data between programmable controllers and other intelligent RS-232-C devices.
Remote I/O configurations list the 1772-LP1 among the PLC-2/20 processors that can be used with the Remote I/O Adapter Module. The associated 1771 I/O structure provides the chassis, power-supply and I/O-module context for a distributed assembly instead of making the processor itself an I/O mounting point.
For an RS-232-C terminal path, the official PLC-2 family interface documentation names the 1772-LP1 as compatible with the 1771-KG interface module. The interface receives power from the 1771 chassis backplane while its processor, program-interface and printer connections are located on the module front.
Communication role
The 1772-LP1 is one of the Bulletin 1772 processors documented for use with the 1771-KA2 Communication Adapter Module. The adapter is the Data Highway station interface that makes controller communication on that network possible.
Data Highway links individual controllers into a broader automated manufacturing network and exchanges data with other intelligent RS-232-C devices. Network layout is bounded by the documented 64-node capacity and 10,000 ft (3,048 m) cable distance.
The Remote I/O Adapter Module compatibility table includes PLC-2/20 processors 1772-LP1 and 1772-LP2. It also lists 1771 universal I/O chassis and modules using the 1771 I/O structure as the corresponding distributed hardware context.
The 1771-KG is compatible with the PLC-2/20 1772-LP1 and is installed in an I/O-module slot of a Bulletin 1771 chassis located within 10 cable-ft of the processor. Its chassis-backplane power path is separate from the front communication connections.
The 1771-KG documentation identifies a processor connector, a program-interface connector and a printer connector on the module front. The processor connector mates with the controller’s industrial-terminal connection; the program interface provides the industrial-terminal cable path.
1772-LP1 is documented for use with a 1771-KA2 Communication Adapter Module. The adapter provides the Data Highway station interface for Bulletin 1772 processors.
The 1771-KA2 is the documented Communication Adapter Module for PLC-2 family processors including 1772-LP1. It enables the controller’s Data Highway connection rather than functioning as a processor itself.
Yes. The Remote I/O Adapter Module compatibility table lists 1772-LP1 and 1772-LP2 as PLC-2/20 processors.
The 1771-KG is installed in an I/O-module slot of a Bulletin 1771 I/O chassis within 10 cable-ft of the processor. The chassis backplane supplies the interface module.
1772-LP1 is identified as a PLC-2/20 processor. The same documentation separately identifies 1772-LP3 as the PLC-2/30 processor.
A single Data Highway cable is documented for up to 64 programmable controllers and computers. The documented cable distance is up to 10,000 ft, or 3,048 m.
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