Title: +038=360.000-OU045T_03-PCD2.m4160 PLS SBC - Hardware Manual.pdf
If it transpires when the PCD is started up that the RAM memory has been corrupted (e.g. after a power failure with a flat or missing battery), the application is automatically reloaded from the flash backup memory. The LIST command "Test" and operand "400" can be used to test this.All hardware settings are also saved to the flash backup memory (onboard or on an equivalent flash card).Partition of user backup memoryThe user backup memory is split into two parts. The first is available for the user program backup and is always present. In the PG5 hardware configurator, this memory is referred to accordingly as "user program backup".Hardware Manual for the PCD2.M5 Series│Document 26/856; Version EN 09│2012-01-253-32Saia-Burgess Controls Ltd.PCD2.M5_ Classic CPUs and expansion housingsMemory space on the PCDThe second, optionally configurable part is referred to in PG5 as "extension memory backup" (data backup) and can be used to back up DBs and texts to the flash during runtime.