Do I need to remove I/O terminals if not used. (Do they affect the hardware config.)?

[Johnbit89]

Hi there,

I have a new Simatic S7-400 with CPU connected to a rack of 2x ET 200M (IM 153-1) terminals which supply 4 x I/O boards each.

I have made several wiring modifications to the I/O terminals. So much so, that 2 of the digital I/O boards are not used.
They only have the 24V power wired to them.

At this point in time I do not have the software for the PLC.

My question:
Do I need to remove the I/O boards which are now redundant? Will I/O boards not in use affect the hardware configuration of the software or must I wait to see what is in the hardware configuration first before removing?

 

[beethoven_ii]

If they are in the hardware configuration they must stay in place whether any input devices are connect to them or not. Removing them will cause a fault on the CPU unless they are taken out of the hardware config.

 

[Johnbit89]

Okay, thanks form the info, much appreciated .

 

[boneless]

You did not specify what kind of I/O it is, but here is a thread on the Siemens forum.

Personally, if you doubt that the channels will ever be used. I would remove the modules and use them somewhere else or keep them as spares, rather than having them age in your cabinet.