Dear experts,

For an OLM G12 connected to ET200M, CH1 LED is off. I read the manual for OLM and I am sure about the correctness of connection and cabling. 

Weird is that when I insert slightly profibus connector into CH1 it goes on but when I push it completely it goes off again!! 

hi Hasan1987,

seems like the connector is defect. Have you tried an other one?

regards,

yes I did 

I changed cable, connectors and OLM