106 Rockwell Automation Publication ICSTT-RM448M-EN-P - February 2021
Chapter 5 Install the AADvance System
The specific functions that the battery maintains on complete loss of power are
the following:
• Real Time Clock – The battery provides 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 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 scan.
• Diagnostic logs – The processors diagnostic logs are stored in the portion
of RAM backed by the battery.
Set the Real Time Clock Manually
If the system has only one controller and does not have a different time server,
you have to set the processor real-time clock manually using RTC variables.
The following procedure assists in setting the clock:
Set up the following variables in the Dictionary
RTC Control Rack Variables (all BOOLEAN Outputs)
• RTC Control: RTC_Read
• RTC Control: RTC_Write
•RTC Control: Year
• RTC Control: Month
• RTC Control: Day of Month
•RTC Control: Hours
• RTC Control: Minutes
• RTC Control: Seconds
• RTC Control: Milliseconds
RTC Status Variables (All Word Inputs)
•RTC Status: Year
• RTC Status: Month
• RTC Status: Day of Month
• RTC Status: Hours
• RTC Status: Minutes
• RTC Status: Seconds
• RTC Status: Milliseconds
RTC Program Rack Variables
•RTC Program: Year
• RTC Program: Month
• RTC Program: Day of Month
• RTC Program: Hours
• RTC Program: Minutes
• RTC Program: Seconds
• RTC Program: Milliseconds
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