Chapter 10 Battery Performance Specifications; Battery Application; Battery Life - Mitsubishi Electric MELSEC iQ-F Series User Manual

10
BATTERY PERFORMANCE SPECIFICATIONS.
The following shows functional specifications of the battery.
The battery can be connected to the FX5U/FX5UC CPU modules.
Item
Battery type
Nominal voltage
Life
*1 The life of the battery changes with respect to ambient temperature.
10.1

Battery Application

The battery can be used to back up (latch) device memory and clock data.
The battery is not incorporated in the CPU module at shipment from the factory. Order it if necessary.
Parameter setting is required to back up the device memory and clock data.
10.2

Battery Life

When the battery voltage is low, the BAT LED on the panel flashes red while the power is on, and SM51 (SM8005) and SM52
(SM8006) turn on. The memory can be retained for about one month after the LED turns on. However, the drop in battery
voltage may not be detected immediately. Prepare a new battery and replace the battery with the new one promptly.
Standard life of the FX3U-32BL: 5 years (at ambient temperature of 25)
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 below and
order replacement batteries in advance.
Relationship between life
and temperature
7
6
5
4
Number of life
years [years]
3
2
1
0
FX3U-32BL
Lithium manganese dioxide battery
3.0V
Standard life: 5 years (at ambient temperature of 25)
0 10 20 30 40 50
Ambient temperature []
*1
10 BATTERY PERFORMANCE SPECIFICATIONS.
10.1 Battery Application
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