22 Battery
22.1 Battery Purpose
389
FX
3G
Series Programmable Controllers
User's Manual - Hardware Edition
21
Me
mor
y
C
asse
tte
22
B
attery
A
Sp
ec
ia
l D
evi
ce
s
(M80
00-,D
8000-)
B
Ins
truction
List
C
D
isc
onti
nued
models
D
Prec
auti
ons
for
battery
transportation
E
H
andli
ng of
ba
tteries i
n EU
m
em
ber state
s
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.
-
When replacing the battery, make sure to use our specified product (FX
3U
-32BL).
-
When a battery error occurs ("ALM" LED is lit in red), follow the description in this manual.
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 FX
3G
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.
