Hello,

We have a S7 300 CPU with 7 ET200S stations. All of them are getting recognized but 2 stations. I have done the following checking, 1) Changed the connectors 2) Changed the cable 3) Replaced the ET200S which I am confident with but only these 2 stations are just not visible. I have 24V supply to all the PM E modules in the rack. 

The error in the hardware config shows Module not available.  PFA photo and file.

Thanks in advance. 

Yes, I have checked them repeated number of times.

I have doubts in the base of the I/O modules. Maybe the circuit in the rack is not getting completed, hence the error?

How do we check/diagnose the base of the I/O modules?

Hello,

Replaced with working IMI modules, confirmed with terminal transistors. 

We have another station at address 32, so what we did was changed this faulty station of address 30 to 32 and then inserted only this station to the CPU disconnecting everything, still its showing faulty. As soon as I plug it in the original 32 IMI it gets detected.

What else do we need to check? Pls let us know. 

Regards