PACSystems™ RX3i and RSTi-EP CPU Reference Manual Section 4
GFK-2222AK October 2019
CPU Operation 118
4.10.3.4 Retention of Data Memory Across Power Failure
The following types of data are preserved across a power cycle with an operational
battery (or for RX3i CPE302, CPE305, CPE310, CPE330, CPE400 or CPL410 models with an
operational and attached Energy Pack and RSTi-EP CPE100/CPE115):
▪ 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).
▪ CPL410 Linux data
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