Allen-Bradley 1762-RTC MicroLogix 1200 Real Time Clock Module

The 1762-RTC is a plug-in real-time clock (RTC) module manufactured by Allen-Bradley for the MicroLogix 1200 programmable logic controller system. Designed to plug directly into the controller's memory module socket, it provides accurate, continuous timekeeping without using external I/O terminals. The 1762-RTC allows the controller to trigger time-stamped events, schedule batch cycles, log process data, and execute calendar-based automation tasks.

Precision Timekeeping and Memory Architecture

The module records 24-hour timekeeping data down to the second, continuously updating registers for year, month, day, day of the week, hour, minute, and second. Power during controller outages is sustained by an internal lithium cell battery, preventing clock drift or loss of system time during power cycles. Battery health can be monitored dynamically in application programs using status flags defined in the MicroLogix 1200 control software.

Featuring Removal and Insertion Under Power (RIUP) functionality, the 1762-RTC allows maintenance personnel to hot-swap the module while the controller chassis remains powered. Built for industrial environments, it features robust electrical noise protection rated at 10 V/m radiated RF immunity, along with high mechanical durability rated for 50 G operational shock and 2 G vibration.

Technical Specifications

Frequently Asked Questions

Q: Does installing the 1762-RTC require taking the MicroLogix 1200 controller offline? A: No, the 1762-RTC supports Removal and Insertion Under Power (RIUP), allowing maintenance personnel to plug in or replace the module without shutting down controller power.

Q: How can operators detect if the internal lithium battery needs replacement? A: The MicroLogix 1200 controller monitors the battery voltage and sets specific system status flags in the controller data file when the battery level drops below operational thresholds.