Retention Of Data Memory Across Power Failure - GE PACSystems RX7i Reference Manual

4.11.4 Retention of Data Memory Across Power Failure

The following types of data are preserved across a power cycle with an operational battery (for RX3i
CPE302, CPE305, CPE310, CPE330),CPE400 models with an operational and attached Energy Pack. RSTi-
EP CPE100/CPE115 have in built super capacitor for data retention.
▪
Application program
▪
Fault tables and other diagnostic data
▪
Checksums on programs and blocks
▪
Override data
▪
Data in register (%R), local register (%L), and program register (%P) memory
▪
Data in analog memory (%AI and %AQ)
▪
State of discrete inputs (%I)
▪
State of retentive discrete outputs (%Q)
▪
State of retentive discrete internals (%M)
The following types of data are not preserved across a power cycle:
▪
State of discrete temporary memory (%T)
▪
%M and %Q memories used on non-retentive -()- coils
▪
State of discrete system internals (system bits, fault bits, reserved bits).
GFK-2222AD April 2018
Chapter 4. CPU Operation
179