Troubleshooting
User manual 57106_hdb_en_13 49 / 94
9 Troubleshooting
General Each expansion module has the LEDs RUN and MF on the front side. These
LEDs help you find errors in your system or faulty modules.
Tab. 9-1: State indications of the LEDs
Total current of elec-
tronics supply exceed-
ed
Configuration error
Module failure
Designation Display LED state
RUN LEDs Off
Green
Green, flashing (2 Hz)
MF LEDs Off
Red
Red, flashing (2Hz)
Behavior of the LEDs
after switching on:
The RUN LED is off on all modules.
The MF LED is only lit on some modules.
Cause: The total current for electronics supply exceeds the maximum
current.
Remedy: Plug in the power module, Art-No. 57131 (see section 8
Installation, Seite 38).
Behavior of the LEDs
after switching on:
The RUN LED is off on one or several modules.
The MF LED is flashing on these modules.
Cause: The module whose MF LED is flashing does not correspond to
the current configuration.
Remedy: Match configuration and hardware structure.
Behavior of the LEDs
after switching on:
The RUN LEDs are flashing up to the module to the left of the
defective module. On the following modules, the RUN LED is
off.
The MF LEDs are off up to the module to the left of the defec-
tive module. On the following modules, the MF LED is lit.
Cause: The module to the right of the flashing modules is defective.
Remedy: Replace the defective module.
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