Battery Life - Mitsubishi Q2ACPU User Manual

21. MAINTENANCE AND INSPECTION

21.3.1 Battery life

(1)
CPU module model name
Q2ACPU
Q2ACPU-S1
Q3ACPU
Q4ACPU
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.
Guaranteed value (MIN)
* Actual value indicates a rough average value and guaranteed value indicates the minimum
value.
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.
Table 21.3 CPU module battery life
Battery life [hr]
Actual value (TYP)
1800
1150
4000
1750
21 - 6
After SM51 is turned ON
14500 48
10700 27
18000 113
6200 44