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FX2NC Series Programmable Controllers
7.3
Common errors
- Corroded contact points at some point in an I/O line.
- An I/O device has been used outside its specified operating range.
- An input signal occurs in a shorter time period that taken by one program scan.
7.4
Replacing the battery
Turn OFF PLC's power supply. Remove sidecover
from the PLC. Remove batter y from holder-
disconnect and replace (this should be carried out
in 20 sec if the current data held in the PLC's RAM
is not to be lost).
Refit battery and cover.
7.5
Maintenance
- Battery has a 3 year life.
- Check interior temperature of the panel.
- Check panel air filters if fitted.
- Check for loosening of terminals or mounting facilities (due to vibration).
Figure 7.1: Battery (FX
Diagnostics 7.
-32BL)
2NC
7-4
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