External Battery - Mitsubishi Electric Q173HCPU User Manual

6 INSPECTION AND MAINTENANCE

6.4 External Battery

The special relays (M9006, M9007) turn ON due to the Motion CPU program or the
decrease in voltage of memory back-up battery.
Even if these special relays turn ON, the program and the contents of memory back-up
are not erased immediately.
However, if these relays are overlooked, the contents may be erased.
While a total of the memory back-up time after the M9006, M9007 turn ON is within a
specified time, replace the battery with a new one.
POINT
M9007 turns ON due to the decrease in voltage of battery. Even if M9007 turns ON,
it holds the data within a specified time.
However, for safety, replace the battery with a new one as soon as possible.
When the external battery voltage is lowered, the M9006 and M9007 turn ON.
M9006 always detects the battery decrease, and it turns ON when the battery voltage
becomes normal.
M9007 detects the battery decrease, and it holds an alarm until the power supply is
turned ON again or reset even if the battery voltage becomes normal.
Set the available/not available of external battery in the system settings.
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