Allen-Bradley · PLC-2/30
Allen-Bradley 1772-LP3 PLC-2/30 Processor
Processor for PLC-2/30 control execution and Data Highway communication through a 1771-KA2 adapter.
Product Overview
Within the PLC-2 family, the 1772-LP3 is the PLC-2/30 Processor used to execute a user program while coordinating the controller scan.
Plant-level data exchange is available when 1772-LP3 is linked to a 1771-KA2 Communication Adapter Module, which supplies the processor-side and Data Highway interfaces.
A replacement decision for 1772-LP3 must retain the complete catalog because PLC-2/20 processors 1772-LP1 and 1772-LP2 and the separate 1772-LR processor have different identities and link requirements.
Technical Data
| Technical Item | 1772-LP3 |
|---|---|
| Brand | Allen-Bradley |
| Product Type | PLC-2/30 Processor |
| Brand Country | United States |
| Controller Family | PLC-2 |
| Communication Adapter | 1771-KA2 |
| Processor Link Rate | 91.2 kbaud |
| Recommended Data Highway Rate | 57.6 kbaud |
| Maximum Network Stations | 64 |
| Maximum Network Distance | 10,000 ft (3,048 m) |
Remote I/O Integration
Processor role
The processor executes the user program and maintains the normal input/output scan for its installed PLC-2/30 station.
I/O relationship
Field states remain part of the PLC scan rather than being transferred to the network adapter as a control task.
Maintenance check
Verify the PLC-2/30 catalog and installed chassis relationship before moving program or I/O responsibilities.
Data Highway Communication
For 1772-LP3, data highway communication must be reviewed with the installed controller hardware and saved application rather than treated as an isolated catalog-number change.
- Use the 1771-KA2 as the station interface.
- Retain the complete 1772-LP3 identity during setup.
- Check the 64-station and 10,000 ft network limits.
Practical Questions
Can 1772-LP3 connect directly to a Data Highway trunk?
Install a 1771-KA2 Communication Adapter Module between the processor and the network. The adapter provides the two communication channels required for the PLC-2/30 station.
Why should the 1772-LP3 processor link not be set to 9.6 kbaud?
The documented processor-side rate for this supported PLC-2/30 processor is 91.2 kbaud. The 9.6 kbaud exception applies to 1772-LR, not 1772-LP3.
What network size can include a 1772-LP3 station?
A Data Highway cable can include up to 64 controller or computer stations. The total cable distance must remain within 10,000 ft (3,048 m).
Does a 1771-KA2 replace the control scan of 1772-LP3?
No; the processor continues scanning I/O and executing its user program. The adapter handles access to the shared communication cable.
How can a buyer avoid confusing 1772-LP3 with 1772-LP1 or 1772-LP2?
Use the full catalog from the installed processor and identify it as PLC-2/30. The related LP1 and LP2 catalogs belong to PLC-2/20 and should not be quoted from the shared prefix alone.
What should be checked before adding 1772-LP3 to an existing plant network?
Confirm the 1771-KA2 interface, processor-side rate, Data Highway rate and remaining station count. Cable routing and total network distance should also be verified before commissioning.
Lifecycle Parts Support
Moore Automation
Keep legacy control assets serviceable
Moore Automation helps maintenance teams source current, discontinued and hard-to-find automation parts. Complete catalog numbers are checked before quotation so close PLC-2 and PLC-3 variants stay separated.
Urgent enquiries, planned spares and replacement projects are handled through one assigned contact from model review to shipment follow-up.
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