Battery Handling; Battery Life And Replacement Guidelines; Reading The Date Of Manufacture; Special "Battery Low-Voltage" Device & Notification Program Example - Mitsubishi FX3G SERIES User Manual

FX Series Programmable Controllers
3G
User's Manual - Hardware Edition
22.4

Battery Handling

When the battery voltage is low, a "ALM" LED lights (red) while the power is ON, and M8005 and M8006 are
switches ON.
Although the battery will continue to function for approximately 1 month after the "BATT" LED switches ON, a
replacement battery should be ordered and installed as soon as possible.

22.4.1 Battery life and replacement guidelines

FX -32BL battery life : Approx. 5 years (ambient temperature : 25 C(77 F))
3U
[Guarantee period: 1 year after delivery or 18 months after
production]
The life of the battery changes with respect to ambient temperature.
When planning for battery replacement, please estimate the battery
life according to the graph to the right and order the replacement
batteries in advance.

22.4.2 Reading the date of manufacture

How to read the battery lot number (reference)
Model name
L OT.4
Year (Example: 2004)
Last digit of calendar
year
22.4.3 Special "battery low-voltage" device & notification program example
Prepare a system which allows constant external monitoring of the battery status, using an indicator lamp,
etc.
• M8005
M8005
Battery low-voltage
• M8006
Battery low-voltage is latched.
• D8005
Battery voltage can be monitored.
Nameplate
4
Month (Example: Apr)
1 to 9 : Jan to Sept.
X : Oct, Y : Nov, Z : Dec
Y001 is output when a battery low-voltage condition occurs.
Y001
Battery life vs. temperature
7
6
5
4
3
2
1
0
0 10
Ambient temperature( C)
Connector
FX -32BL
3U
LOT.44
............
22 Battery
22.4 Battery Handling
21
22
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347
A
B