Overview
The Allen-Bradley 1772-LP3 /A is a Bulletin 1772 PLC-2/30 processor module—a mature, proven industrial programmable controller for manufacturing, process control, and material-handling applications. This unit is used condition and ready to integrate into legacy or mixed-era automation systems. The 1772-LP3 /A delivers reliable logic execution with straightforward configuration and broad compatibility across Allen-Bradley I/O chassis and modules.
Key Features
- Read/Write CMOS Memory: Stores user program instructions, I/O status, and numeric values for reliable execution and retention.
- Ladder Diagram & Functional Block Programming: Enter programs rung-by-rung or use functional block display format from Allen-Bradley 1770-T3 or 1784-T50 terminals.
- Data Highway Compatibility: Optional interface module enables connection to Allen-Bradley Data Highway or industry-standard networks for remote I/O and system integration.
- 4-Position Mode Select Switch: Front-mounted control for Run, Test, and offline modes simplifies commissioning and troubleshooting.
- Comprehensive I/O Configuration: Supports scanners, interface modules, input/output modules, and power supplies for flexible system layout.
Technical Specifications
- Memory Capacity: 256 words (read/write CMOS)
- Maximum I/O Points: 896 (up to 1,792 with complementary I/O)
- Input Voltage: 120–240V AC
- Processor Current Rating: 2A @ 120V, 1A @ 240V
- Weight: Approximately 25 pounds
- Programming Interface: 1770-T3 or 1784-T50 terminal
- Communication: Data Highway via optional interface module (1771-ASB Remote I/O Adapter support)
Typical Applications
- Machine control and process automation in manufacturing plants
- Packaging, material handling, and conveyor systems
- Pollution monitoring and environmental control systems
- Measurement and gauging operations
- Multi-chassis I/O control with remote distribution panels
Compatibility & Replacements
The 1772-LP3 /A integrates with all Bulletin 1771 I/O modules, Bulletin 1772 peripheral modules, and Allen-Bradley interface adapters. It can be paired with 1771-A1, -A2, and -A4 I/O chassis, 1771-P series power supplies, and 1772-SD2 remote distribution panels. For legacy system upgrades or spare inventory, the 1772-LP3 /A remains the industry-standard PLC-2/30 processor module. Verify module configuration and switch settings per Rockwell Automation publication 1772-2.18 before commissioning.
