Battery Handling; Battery Life & Replacement Guidelines; Reading The Date Of Manufacture; Special "Battery Low-Voltage" Device & Notification Program Example - Mitsubishi FX3U SERIES User Manual

FX Series Programmable Controllers
3U
User's Manual - Hardware Edition
22.3

Battery Handling

When the battery voltage is low, a "BATT" 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.
22.3.1 Battery life & replacement guidelines
FX -32BL battery life : Approx. 5 years (ambient temperature :
3U
25°C(77°F))
[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.

22.3.2 Reading the date of manufacture

1. Reading the optional battery's lot No.
Batteries with affixed nameplate labels are optional batteries.
Year (Example: 2004)
Last digit of calendar
year
2. Reading the battery's year/month of manufacture [main unit's internal battery]
Batteries without affixed nameplate labels (refer to item 1. above) are main unit internal batteries.
0 4
22.3.3 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.
438
Model name
L OT.4 4
Month (Example: Apr)
1 to 9 : Jan to Sept.
X : Oct, Y : Nov, Z : Dec
1 0 0 1
Ref. No.
Month (Example: Apr)
1 to 9 : Jan to Sept.
0 : Oct, Y : Nov, Z : Dec
Year (Example: 2004) Last 2 digits of Western-calendar year
Y001 is output when a battery low-voltage condition occurs.
Y001
Nameplate
FX -32BL
3U
LOT.44
............
0
22 FX3U-32BL (Battery)
22.3 Battery Handling
Battery life vs. temperature
7
6
5
4
3
2
1
0
0 10 20 30 40
Ambient temperature(°C)
Connector
Connector
50