Rockwell Automation 1764-xxxx MICROLOGIX 1500 PROGRAMMABLE CONTROLLERS - Manual (Page 105)

Publication 1764-UM001B-EN-P - April 2002
Using Real-Time Clock and Memory Modules 6-3
Use the Disable Clock button in your programming device to disable
the real-time clock before storing a module. This decreases the drain
on the battery during storage.
Memory Module Operation The memory module supports program back-up as well as the
following features:
•
User Program and Data Back-Up
•
Program Compare
•
Data File Download Protection
•
Memory Module Write Protection
•
Removal/Insertion Under Power
User Program and Data Back-Up
The memory module provides a simple and flexible program/data
transport mechanism, allowing the user to transfer the program and
data to the controller without the use of a personal computer and
programming software.
The memory module can store one user program at a time.
During transfers from a memory module, the controller’s RUN LED
flashes.
Table 6.1 RTC Battery Life Expectancy
Battery State Temperature Time Duration
Operating 0°C to +40°C (+32°F to +104°F)
5 years
(1)
(1) The operating life of the battery is based on 6 months of storage time before the real-time clock is used.
Storage -40°C to +25°C (-40°F to +77°F) 5 years minimum
+26°C to +60°C (+79°F to +140°F) 3 years minimum
ATTENTION
!
Operating with a low battery indication for more
than 14 days may result in invalid RTC data if
controller power is lost.