The maximum number of CB operations within a specific time period may be set with parameter MAIN: CB1 max. oper. cap. Associated with this parameter is the counter at MAIN: CB1 act. oper. cap. to which the maximum number of CB operations permitted is assigned as soon as the positive edge of an event is present that has been selected by a “1 out of n” parameter at MAIN: CB1 ready fct.assign.

The number of CB operations permitted, set with the counter at MAIN: CB1 act. oper. cap. are then decremented by 1 with each CB operation. Operation of the CB is recognized from the contact position signals DEV01: Switch. device open and DEV01: Switch.device closed.

The counter at MAIN: CB1 act. oper. cap. may only be decremented to a value of 1. Reaching a value of 1 will in no way effect the protection or control functionality, in particular there will be no blocking of CB operation! When a CB fault has occurred (i.e. MAIN: CB1 faulty EXT is set to Yes) the counter MAIN: CB1 act. oper. cap. is immediately set to 1.