This is the 8K CMOS memory card used in the DHP. The DHP chassis requires two of these memory cards.

The CMOS RAM of the DHP contains variable data that is either configured or process-derived. The configured data of the DHP comes from the operator station, defining areas of memory to process points. Process-derived data is collected by scanning the PLC memory via RS232 communication with the PLC.

The DHP implements parity checking of the CMOS memory to detect memory errors during operation.

The DHP battery 30752948-001 maintains the values in the CMOS memory for up to 120 hours.