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22 Battery
22.1 Battery Purpose
385
FX3G Series Programmable Controllers
User's Manual - Hardware Edition
21
Memory
Cassette
22
Battery
A
Special Devices
(M8000-,D8000-)
B
Instruction List
C
Discontinued
models
D
Precautions for
battery
transportation
E
Handling of
batteries in EU
member states
22. Battery
The battery is not incorporated in the PLC main unit at shipment from the factory.
Order it if necessary.
22.1 Battery Purpose
The battery backs up the following contents against power interruption.
Proper parameter setting is required to back up the device memory and current time.
→ For the parameter setting method, refer to Section 22.3.
*1. The data is backed up by the large-capacity capacitor built in the PLC at shipment from the factory.
→ For backup by the capacitor, refer to Section 4.5.
22.2 Specifications
STARTUP AND MAINTENANCE
PRECAUTIONS
• Use the battery for memory backup correctly in conformance to this manual.
- Use the battery only for the specified purpose.
- Connect the battery correctly.
- Do not charge, disassemble, heat, put in fire, short-circuit, connect reversely, weld, swallow or burn the battery, or apply excessive
forces (vibration, impact, drop, etc.) to the battery.
- Do not store or use the battery at high temperatures or expose to direct sunlight.
- Do not expose to water, bring near fire or touch liquid leakage or other contents directly.
- Incorrect handling of the battery may cause heat excessive generation, bursting, ignition, liquid leakage or deformation, and lead
to injury, fire or failures and malfunctions of facilities and other equipment.
STARTUP AND MAINTENANCE
PRECAUTIONS
• Turn off the power to the PLC before attaching or detaching the following devices.
Failure to do so may cause equipment failures or malfunctions.
- Peripheral devices, display module, expansion boards, and special adapters
- Extension units/blocks and FX Series terminal blocks
- Battery and memory cassette
TRANSPORTATION AND
STORAGE PRECAUTIONS
• When transporting the FX3G Series PLC incorporating the optional battery, turn on the PLC before shipment, confirm that the battery
mode is set using a parameter and the ALM LED is OFF, and check the battery life.
If the PLC is transported with the ALM LED on or the battery exhausted, the battery-backed data may be unstable during
transportation.
• When transporting lithium batteries, follow required transportation regulations.
(For details of the regulated products, refer to Appendix E)
Item Data Retained By Backup Battery
Device memory
Auxiliary relay M1536 to M7679, state S1000 to S4095, data register D1100 to D7999,
extended register R0 to R23999
Current time
*1
Current time clock
Item Specifications Remarks
Nominal voltage 3V Battery voltage can be monitored with PLC data register D8005.