The CPUs are equipped with a backup battery. The following areas are buffered:
Remanent variables
User RAM
System RAM
Real-time clock
Battery monitoring
The battery voltage is checked cyclically. The cyclic load test of the battery does not considerably shorten thebattery life, instead it gives an early warning of weakened buffer capacity.The status information "Battery OK" is available from the system library function "Batteryinfo" and the CPU's l/O mapping.
Battery change interval
The battery should be changed every 4 years. The change intervals refer to the average life span and operatingconditions and are recommended by B&R, lt is not the maximum buffer duration.
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