Siemens SIMATIC ET 200pro Manual page 27

Distributed i/o ethernet/ip interface module

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Network Status LED flashing red

If the Network Status LED is flashing red, one or more I/O connections are in the time-out

state. This can be caused by the controller stopping I/O without closing the connection or by

a break in EtherNet communications.

I/O Status LED flashing red

If the I/O Status LED is flashing red, one or more of the inputs/outputs are faulted when I/O

is active. This only occurs if an I/O connection is open (Network Status LED is solid green).

This may be caused by a diagnostic alarm due to a short circuit on an output module, a

missing module due to hot swapping, or a missing terminating module.

Troubleshooting