Hi all , 

I am having trouble with OLM/G11 module (6GK1503-2CB00) , I am using two OLM to link between PLC S7200 and PC . System configuration as below :

PLC-EM277-OLM1----------FO(mono mode)---------- OLM2-PC

Profibus Baud Rate : 187.5 KBPS 

And 

OLM-1 STATUS LED's :

SYSTEM: FLASHES RED

CH1: NOT LIT

CH2: RED

CH2 LEVEL : RED  

OLM-2 STATUS LED's :

SYSTEM: FLASHES RED

CH1: NOT LIT

CH2: RED

CH2 LEVEL : RED 

Communication Not working at all , 

What is the problem? How to solve it?

Tks!

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Split from Profibus OLM Problem .