Adding Input modules in middle of IM rack problem

Hello,

I've been recently tasked to add 2 digital input modules to already existing ET200s rack. 

The main issue is, this needs to be put in between modules, which results in moving safety outputs. These outputs i use, to cut off normal power to the modules...

I add 1 power and 2 input modules in HW,, move everything before 3 spaces down (at first 30 modules, after update 33 - sOutputs at slot 33) and upload HW.

For some reason ET200s doesn't see any module (message: Module missing in slot 1,2,3,..,33)

Also safety output module has it's own message (IO bus undefinable as of slot 33)

I also recompiled safety program (CRC didn't change) but still no change.

Restard of Step 7 also didn't help.

I'm at a loss - such simple task and so many problems...

hi,

I also guess that there is something on backplane-bus, like the termination at the end. 

Check if everything is connected correct.

regards,

The problem... was solved.

Termination at the end was all the time. 

The issue is - for some reason it didn't occur to me to drop the power on the IM module after the change. 

After taking out the power plug it started working perfectly :)

Thank You anyway for the help