Rockwell Automation 57C423 Common Memory Module - Manual (Page 33)

DĆ1
Appendix D
Summary of Common
Memory Module Features
M/N 57C413
This module has 128K bytes of memory and requires external battery backup
(M/N 57C492)to mainain the contents of memory in the event of a power failure.
M/N 57C413B
This module has 128K bytes of memory and an onĆboard lithium battery to
maintain the contents of memory in the event of a power failure.
M/N 57C423
This module has 256K bytes of memory available when plugged into slot 0, and
128K bytes available when plugged into any other nonĆzero slot. An onĆboard
lithium battery maintains the contents of memory in the event of a power failure.
This module is supported only by the following Program Executive version: 2.1E,
and 3.1C and later.