Omron CPM2C Operation Manual page 50

Item Item
Memory backup
(See notes 1 and 2.)
Self-diagnostic functions
Program checks
10 I/O points
(Relay outputs)
Flash memory:
Program, read-only DM area, and PC Setup
Memory backup:
The read/write DM area, HR area, AR area, and counter values are backed up.
CPU Unit with clock (battery): 2-year lifetime at 25°C
CPU Unit without clock (capacitor): 10-day backup at 25°C
CPU Unit without clock (lithium battery): 5-year lifetime at 25°C
CPU Unit failure (watchdog timer), I/O bus error, battery error, and memory failure
No END instruction, programming errors (checked when operation is started)
Note 1. The DM area, HR area, AR area, and counter values are backed up. If the
backup battery or capacitor is discharged, the contents of these areas will
be lost and the data values will revert to the defaults.
2. The contents of the program area, read-only DM area (DM 6144 to
DM 6599), and PC Setup (DM 6600 to DM 6655) are stored in flash
memory. The contents of these areas will be read from flash memory the
next time the power is turned ON, even if the backup battery or capacitor is
discharged.
When data has been changed in any of these areas, write the new values to
flash memory by switching the CPM2C to MONITOR or RUN mode, or by
turning the power OFF and then ON again.
CPU Unit Specification
10 I/O points
(Transistor outputs)
Section 2-2
20 I/O points
(Transistor outputs)