OVERVIEW

Official designation: Allen-Bradley 1764-RTC (MicroLogix 1500, Real-Time Clock Module)

Role/Application: Plug-in accessory module for MicroLogix 1500 controllers to ensure accurate time and date retention for scheduling, time-stamping, and critical control operations.

KEY SPECS SUMMARY

Power: Internal lithium battery (non-replaceable)

Interfaces / Ports: Internal processor bus

Indicators: Battery low status file (RTC:0/BL)

Operating Temp: 0 to 40 degrees C (for 5-year battery life)

Platform / Compatibility: MicroLogix 1500 1764-LSP, 1764-LRP processors

Limit: Accuracy varies; plus 36 to minus 68 seconds per month at 25 degrees C

Lifecycle: Discontinued/Obsolete

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What are the provided timekeeping elements from the Real-Time Clock module?

A: The clock provides year, month, day of month, day of week, hour, minute, and second.

Wiring & Installation:

Q: Can the 1764-RTC module be safely installed or removed while the controller is running?

A: Yes, the module supports removal and insertion under power without interrupting controller operation.

Troubleshooting & Compatibility:

Q: What happens to the time data if the non-replaceable internal battery is fully drained?

A: The time and date information will be reset every time the host controller is powered off and on.

Replacement & Upgrades:

Q: What is the rated battery life of the internal, non-replaceable RTC module battery?

A: The battery has a minimum operating expectancy of 5 years between 0 degrees C and 40 degrees C.