21.
21 - 6
MAINTENANCE AND INSPECTION
21.3.1 Battery life
(1) Battery life of CPU module
The CPU module battery life differs depending on the CPU model. The life for each
CPU model is shown in Table 21.3.
* Actual value indicates a rough average value and guaranteed value indicates the minimum
value.
Table 21.3 CPU module battery life
CPU module model name
Battery life [hr]
Guaranteed value (MIN) Actual value (TYP) After SM51 is turned ON
Q2ACPU 1800 14500 48
Q2ACPU-S1 1150 10700 27
Q3ACPU 4000 18000 113
Q4ACPU 1750 6200 44
POINT
(1) Use the battery within the time shown by the guaranteed value of the battery
life.
(2) If the battery may be used exceeding the guaranteed time, perform the
following measures.
Perform ROM operation to protect a program in case that the battery dies at
PLC power supply OFF.
After SM51 (Battery low) turns ON, back up a program and data within the
specified time shown in the Table 21.3.
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