Siemens SIMATIC ET 200pro - Page 27

The ET 200pro EtherNet/IP module
3.5 Troubleshooting
ET 200pro distributed I/O EtherNet/IP interface module
Manual, 03/2016, A5E32861915-AB
27
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.
See also
Faults (Page 23)