During commissioning of a customers plant, i have found many "spare" profibus modules in the hardware tree. Since they are not connected they are generating an alarm. Instead of removing the unused hardware, disabling the alarms from the main system alarm list was my plan. Its working fine for the alarms from one of the AC800M, and they appear in my "disabled alarms list". But i cannot disable the alarms for the other AC800M, when i hit the "disable selected" nothing happens.