Allen-Bradley 1764-LRP Logic Relay Processor Module

The Allen-Bradley 1764-LRP Logic Relay Processor Module is an enhanced MicroLogix 1500 processor that delivers compact PLC control with 14K user memory and built‑in serial communications. It runs firmware revision 14 and is programmed with RSLogix 500. The unit provides two RS‑232 serial ports (one isolated, one non‑isolated) that support DF1 full duplex, DF1 half duplex, ASCII, Modbus, and DH‑485 protocols for direct device communication and simple networks. The 1764-LRP includes two built‑in digital trim potentiometers (0–250) for field calibration and can work with optional memory and RTC accessories to extend data storage (e.g., 1764-MM1RTC or 1764-MM2RTC) as part of a MicroLogix 1500 system. With its processor core and ladder‑logic compatibility, it’s suitable for small automation tasks needing reliable logic execution, relay‑style I/O, and straightforward RS‑232 connectivity, often paired with a MicroLogix 1500 base unit and RSLogix 500 workflow for configuration and troubleshooting.