With respect to binary outputs, the integrated self-monitoring function includes even two-phase triggering of the relay coils of all the relays. There is no monitoring function for the external contact circuit. In this case, the all-or-nothing relays must be triggered by way of device functions or integrated test functions. For these testing purposes, triggering of the output circuits is integrated into the software through a special control function (Oper/CtrlTest menu branch).