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11.3 Battery Life and Replacement Procedure
11.3.2 Battery lives of CPU modules
11
MAINTENANCE AND INSPECTION
POINT
1. Do not use the battery exceeding its guaranteed life.
2. When the battery hours (total power failure time) may exceed its guaranteed
value, take the following measure.
• Perform ROM operation to protect a program even if the battery dies at
the programmable controller power-OFF.
• Back up programs and data after SM52 turns on (within the backup time
after alarm occurrence).
3. When the battery (Q6BAT) is not connected to the CPU module, its service
life is five years.
4. When the battery-low special relay SM52 turns on, immediately change the
battery.
Even if the alarm has not yet occurred, it is recommended to replace the
battery periodically according to the operating condition.
5. The battery (Q7BAT and Q8BAT) is not available for the Basic model QCPU.
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