36 Rockwell Automation Publication ICSTT-RM448M-EN-P - February 2021
Chapter 2 The AADvance Safety Controller
system power supplies. The specific functions that the battery maintains on
complete loss of power are:
• Real Time Clock - The battery supplies power to the RTC chip itself.
• Retained Variables - Data for retained variables is stored at the end of
each application scan in a portion of RAM, backed up by the battery. On
restoration of power' the retained data is loaded back into the variables
assigned as retained variables for use by the application.
• Diagnostic logs - The processor diagnostic logs are stored in the portion
of RAM backed by the battery.
The battery has a design life of 10 years when the processor module is
continually powered; for processor modules that are un-powered, the design
life is up to 6 months. Battery design life is based on operating at a constant
25°C and low humidity. High humidity, temperature and frequent power
cycles will shorten the operational life of the battery.
Low Battery Alarm
A variable in the AADvance Workbench software or AADvance-Trusted SIS
Workstation software can be set up and report the battery status. It will give an
alarm and set a warning light on the processor front panel when the battery
voltage is low.
Disabling the Low Battery Alarm
For applications that do not require Real Time Clock functionality, or there are
specific constraints, for example, the controller is in an inaccessible location,
that make it necessary to remove the battery when the system is installed and
set up, the battery failure alarm can be disabled from AADvance Workbench
software or AADvance-Trusted SIS Workstation software.
Battery Location
The battery is supplied separately and inserted into a slot behind a removable
cover on the front panel of the processor module. The battery position is shown
in the illustration:
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