Battery Life & Replacement Guidelines; Battery-Free Operation; Differences Between Main Unit's Internal Battery And The Optional Battery - Mitsubishi FX3UC SERIES User Manual

FX Series Programmable Controllers
3UC
User's Manual - Hardware Edition
11.5.4 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.

11.5.5 Battery-Free Operation

FX series operation is possible without a battery (PLC's internal battery removed) when the following
3UC
conditions are satisfied.
→ Refer to the FX
1. A memory cassette must be installed.
2. The following devices must not be used as "keep" devices.
Auxiliary relays, state (for annunciator included), timers (cumulative type), counters, data register "keep"
device, extended registers.
3. The sampling trace function must be disabled.
4. The clock function must be disabled.

11.5.6 Differences between main unit's internal battery and the optional battery

Although the optional battery (FX
the ways described below.
They may also have different external colors due to dates of manufacture.
External
appearance
1 year from delivery or 18 months from date of
Warranty
manufacture, with reference to the main unit's
period
manufacture No.
/FX Programming Manuals for details concerning battery-free operation.
3U 3UC
-32BL) serves as the same as the main unit's internal battery, they differ in
3U
Main Unit Internal Battery
Connector
0
11 Memory Cassette/Battery
11.5 FX3U-32BL (Battery)
Battery life vs. temperature
7
6
5
4
3
2
1
0
0 10 20 30
Ambient temperature(°C)
Optional Battery (Spare)
A nameplate label indicating the product model
and lot No. is affixed.
Connector
FX -32BL
3U
LOT.44
............
Nameplate
1 year from delivery or 18 months from the date
of manufacture, with reference to the lot No.
11
12
A
40 50
B
C
D
E
F
381