Hardware Information
7-8
SIMATIC Rack PC 840 Manual
A5E00104826-03
7.4.5 Fan Monitoring
Front and processor fan operation are monitored. If a fan should fail, the following
reactions are triggered:
Reaction Option
Temp LED turns to red –
Fan LED turns to red –
SOM application is displayed –
The temperature error remains stored until the cause of the fan failure has been
corrected in one of the following ways:
Acknowledgement of the error message via the SOM program.
Device restart.
Flashing of the Temp LED indicates that the device is being operated in the limit
range. Please check if the permissible ambient temperature has been exceeded or
if the filter is soiled.
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