CMOS Expansion Memory

Memory is retained in the event of power loss by the

battery on the base board housing.

Logic program memory is continually error-checked

by the PLC CPU as a background task.

The PCM error checks storage memory when power

is  cycled and on hard or soft resets.

This CMOS Expansion Memory is available in four

versions; 64. 128. 256 and 512 Kbytes. This memory

may be used to expand logic and data memory in ei

ther the CPU 771 (IC697CPU771) and CPU 772

(IC697CPU772) modules, or the Programmable Co

processor Module (IC697PCM711).  It is installed as a

daughter board and resides in the same slot as the

module it serves.  Memory on this board supplements

memory available on the base board.