FX3U Series Programmable Controllers
User’s Manual - Hardware Edition
471
22 FX3U-32BL (Battery)
22.4 Battery-Free Operation
21
Memory
Cassette
22
Battery
A
Special Devices
(M8000-,D8000-)
B
Instruction List
C
Character-code
D
Discontinued
models
E
Precautions for
battery
transportation
F
Handling of
batteries in EU
member states
2. Reading the battery’s year/month of manufacture [main unit’s internal battery] (reference)
Batteries without affixed nameplate labels (refer to item 1. above) are main unit internal batteries.
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
Y001 is output when a battery low-voltage condition occurs.
• M8006
Battery low-voltage is latched.
• D8005
Battery voltage can be monitored.
22.4 Battery-Free Operation
FX3U series operation is possible without a battery (PLC’s internal battery removed) when the following
conditions are satisfied.
→ Refer to the FX3U / FX3UC Programming Manuals for details concerning battery-free operation.
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.
0
4
1
0
0
1
0
4
1
0
0
1
Connector
0 4 1 0 0 1
Ref. No.
Year (Example: 2004) Last 2 digits of Western-calendar year
Month (Example: Apr)
1 to 9 : Jan to Sept.
0 : Oct, Y : Nov, Z : Dec
M8005
Battery low-voltage
Y001
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