Omron SYSMAC C Series User Manual page 126

Specifications
Number of internal auxiliary relays 136 points (Relays 1000 to 1807)
Number of holding relays 160 points (Relays HROOO to 915)
Number of timers/counters 48 points (Timers/Counters TIM(H)/CNT00O to 47)
Timer: 0.1 to 999.9s
High-speed timer:0.01 to 99.99s
Counter: 1 to 9999 counts
Number of temporary memory 8 points (Relays TRO to TR7)
relays
Number of auxiliary relays 16 points (Relays 1808 to 1907) including:
Battery failure flag (1808)
Normally OFF relays (1809, 1810, 1811, 1812, and 1814)
Normally ON relay (1813)
Initial one scan time ON relay (1815)
For generation of 0.1s clock (1900)
For generation of 0.2s clock (1901)
For generation of 1s clock (1902)
Memory protection against power Status of holding relays and present value of counters before power
failure failure retained in memory
Battery Service life of built-in battery approximately 5 years at ambient tempera-
ture of 25°C. Battery life shortened if ambient temperature exceeds 25°C.
Replace battery within one week after ALARM/ERROR indicator illumin-
ates. Battery must be replaced within approximately 5 minutes after the
power is turned off.
Diagnostic functions CPU failure (watchdog timer)
Battery failure
Memory error
O bus failure
PROGRAM check (program execution time only)
END instruction missing
Instruction error