Hello,

Probably you may be having a bus fault (BF) because of that SF also lit. First check your hardware configurations if every thing is matching with physical configuration, check your profi bus (Specially the termination of the bus connectors). And check your slaves are in online. It will be easy using diagnostic buffer as UMENCHO mentioned.

Best regards,

I didnt see SF flashing.

BF flashing means bus failure. That may mean something wrong with the bus (wrong transmission rate e.t.c). Also this behaviour appeares if you configured CPU as slave and there is no exchange with master. After first exchange is done it should stop flashing in this case.

So i would ask you to upload your network configuration also....

Attached picture shows what Wizard told, make sure you are online.

best regards,

Marcjan

Daddymac

Hey guys i'm really new to siemens. however i have this same flashing bus fault and have run the diagnostics buffer. It is telling me that there is an I/O error with OB122, at adress 35. how do i tell physically which module this is?
The suggested corrective action is to physically replace this module.

Daddymac

... at adress 35...

Dear sir,

Same problem is happening in my one of site. 

i am attaching online diagnostic buffer. kindly give me a solution to solve the issue.

one main station (S7 315 2dp) and 9 ET200 remote stations.