Disabling a CI854 module
If you have more slaves connected under this CI854, I would suggest to go for additional licensing.
If you are not bothered/slaves are not connected you can remove the module from Panel side (Either removing the profibus connection or removing the complete module)
If you are removing complete module, make sure that addresses of other master modules remains same or correct it accordingly.
You have to do the same in CBM as well.
Hope it helps