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BAT.LOW LED Indicator
After the 24 V DC power is switched off, the data in the latched area will be stored in the
SRAM memory, and the rechargeable battery will supply power to the SRAM memory.
Therefore, if the battery is damaged or cannot be charged, the data in the program and
latched area will be lost. If you need to permanently store the data in the program and
latched data register, please refer to the mechanism of storing the data in the Flash
ROM permanently and the mechanism of restoring the data in Flash ROM stated below.
Mechanism of storing the data in the Flash ROM permanently:
You can use WPLSoft (Options -> PLC<=>Flash) to indicate whether to permanently
store the data in the latched area in Flash ROM memory (the new indicated data will
replace all data previously saved in the memory).
Mechanism of restoring the data in Flash ROM:
If the rechargeable battery is in low voltage, resulting in possible loss of data in the
program, the PLC will automatically restore the data in the latched area in the program
and device D of Flash ROM into SRAM memory (M1176 = On) next time when DC24V is
re-powered. The ERROR LED flashing will remind you that if the recorded program is
able to resume its execution. You only need to shut down and re-power the PLC once to
restart its operation (RUN).
1. The rechargeable lithium-ion battery in DVP-SV/SV2 is mainly used on the latched
procedure and data storage.
2. The lithium-ion battery has been fully charged in the factory and is able to retain the
latched procedure and data storage for 6 months. If DVP-SV/SV2 has not been
powered for less than 3 months, the life of the battery does not decrease. To prevent
the electricity emitted by the battery from resulting in short life of the battery, before
disconnecting DVP-SV/SV2 for a long time, you need to power DVP-SV/SV2 for 24
hours to charge the battery.
3. If the lithium-ion battery is put in an environment in which temperature is above 40
or if it is charged for more than 1000 times, its effect becomes bad, and the time for
which the data can be stored is less than 6 moths.
4. The lithium-ion battery is rechargeable, and has a longer life span than an ordinary
battery. However, it still has its own life cycle. When the power in the battery is not
sufficient to retain the data in the latched area, please send it to the distributor for
repair.
5. Please be aware of the date of manufacturing. The charged battery can sustain for 6
months from its date of manufacture. If you find that the BAT.LOW indicator stays on
after PLC is powered, it means the battery voltage is low and the battery is being
charged. DVP-SV/SV2 has to remain on for more than 24 hours to fully charge the
battery. If the indicator turns from on to "flash" (every 1 second), it means that the
battery cannot be charged anymore. Please correctly process your data in time and
send the PLC back to the distributor for repair.
Accuracy (second /month) of RTC
Temperature (ºC/ºF)
Max. inaccuracy (second)
0/32
25/77
-117
52
- 8 -
55/131
-132
o
C,
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