SRAM

The SRAM is a battery-buffered, nonvolatile RAM and is used for the retain/persistent and the ProzM variables. If a battery is inserted into the Processor Module, the data stored in the SRAM will not get lost during a power-down cycle.

During PLC startup, the SRAM will be deleted automatically if no or an empty battery is inserted into the Processor Module. In this case the information

ABBInitSram_SetupMemory : SRAM cleared

and the warning

Retain size in config changed, or retain area got corrupted

are written into the log file.

Further information see Handling_of_Remanent_Variables_V3: Handling of Remanent Variables for AC500 V3 Products