Allen-Bradley 1772-LP2 PLC-2/20 Processor Module

The 1772-LP2 is an Allen-Bradley PLC-2/20 processor module featuring an integrated power supply, designed for central processing and system control in legacy industrial automation networks. Operating on a 120/240 VAC power source, this chassis-mountable module executes ladder logic programming, manages subsystem timing and counting functions, and orchestrates data transfer across local and remote 1771 I/O configurations.

Processing Performance and Memory Capacity

The 1772-LP2 processor handles up to 8,192 words of memory, providing reliable control execution for medium-scale industrial machinery. Designed around the established Allen-Bradley PLC-2/20 architecture, it supports standard relay instruction sets, bit manipulation, timers, counters, and basic mathematical operations required for automated machine sequencing.

Integrated Power Supply and Chassis Installation

Equipped with an internal power supply unit, the module converts standard 120/240 VAC line voltage to the internal DC levels needed to power the processing circuitry and support backplane communication. Its rugged chassis-mount structure installs directly into compatible 1771-series assemblies, ensuring sound mechanical mounting and reliable system grounding in harsh operational environments.

System Diagnostics and Interface Features

Continuous operational monitoring is managed through front-panel diagnostic indicators, which display power status, processor run conditions, and fault signals. The module interfaces with Allen-Bradley programming terminals and Data Highway networks, enabling real-time diagnostic evaluation, online program monitoring, and structured maintenance routines.

Frequently Asked Questions

Q: Does the 1772-LP2 require a separate external power supply module to operate? A: No, the 1772-LP2 includes an integrated internal power supply that accepts 120/240 VAC input directly.

Q: How does the 1772-LP2 differ from the 1772-LP3 processor? A: The 1772-LP2 belongs to the PLC-2/20 family with up to 8,192 words of memory and features an integrated power supply, whereas the 1772-LP3 is a PLC-2/30 processor with up to 16,256 words of memory capacity.