Troubleshooting LION System
EN1Z-0921GE51 R0315
40
Alarm LED (red)
Case Alarm LED Meaning Remedy
1 OFF Normal operation No action necessary
2 ON
Watchdog alarm output is powered
– The controller has encountered a
hardware problem
- or -
– The application has a fault
- or -
– The controller has been powered up
without an application or the operator
has manually stopped the application,
e.g., using XL-Online. In this case, the
LED will light up and, simultaneously,
the watchdog relay will be activated
22 minutes after power-up without
application.
► Try powering down and then
powering up the CLLIONLC01.
► If the problem persists, check and – if
necessary – reload the application.
► If the problem still persists, replace
hardware
3 Flashing Although the controller has encountered a
problem, the watchdog alarm output has not
yet been powered.
If the problem persists, the LED will become lit
constantly, see case #2.
The controller performs a warm start.
If it happens only once, the controller
has performed a restart
If, however, it happens multiple times,
then there is an application or hardware
problem (see case #2)
Table 43 CLLIONLC01 alarm LED
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