Mitsubishi FX2-16E series, User Manual

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FX
3U
Series Programmable Controllers
User’s Manual - Hardware Edition
469
22 FX3U-32BL (Battery)
22.1 Battery Purpose
21
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22. FX
3U
-32BL (Battery)
The main unit of the PLC has a built-in battery.
When the battery voltage drops, the BATT LED is lit, and the special auxiliary relay (M8005 or M8006) turns
on. In this case, replace the battery FX
3U
-32BL.
22.1 Battery Purpose
The battery is required to retain (backup) program memory and "latched device" data and maintain clock
operation in the event of a power outage.
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
• Before transporting the PLC, turn on the power to the PLC to check that the BATT LED is off.
If the PLC is transported with the BATT 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)
Data Retained By Backup Battery
Program memory Internal RAM parameters, programs, device comments, file registers, symbolic information
Device memory
• Auxiliary relay, state (for annunciator included), timer (cumulative type), counter, data
register latched device
• Extended register
• Sampling trace result
Current time Current time clock
Item Specifications Remarks
Nominal voltage 3V Battery voltage can be monitored with PLC data register D8005.