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4. PRE-MONITORING SETTINGS, INSTALLATION, AND SET-UP
MELSEC·A
4.4
Memory Card Battery Replacement
4.4.1
When should the battery be replaced?
(1)
Low battery power indication
The AD57G confirms that battery power to a memory card (inserted into
memory card interfaces 1 or 2) is running low.
When the AD57G detects low power, the battery error detected signals
(X13) and/or (X14) go ON.
X13 : ON when battery power to the memory card inserted into memory
card interface 1 is below the required level.
X14 : ON when battery power to the memory card inserted into memory
card interface 2 is below the required level.
(2)
When should a battery be replaced?
Create a sequence program to detect a battery error.
The memory detected contents can be retained about 168 hours after
turning the battery error detected signal goes ON.
When a battery error is detected, replace the battery as soon as pos-
sible.
(3)
Battery lifetime
The memory card must always be battery-backed.
Mitsubishi recommends that the battery should be replaced at the inter-
vals given below.
Model
A6MEM·256KAW
A6MEM·512KAW
Operating Condition
Guaranteed lifetime
1900Hr
900Hr
When the memory
(Min.)
card is backed up
Reallifelime (Typ.)
11300Hr
5900Hr
Working time after a battery error signal
goes
ON
(if the ambient temperature is
79Hr
39Hr
2S·C)
Note:
Mlteubrehl cannot guarantee the battery backup of an unused battery that was
manufactured more than four years ago.
4-9
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