Control/Desired

The switching command last given by the operator – with the On and Off buttons below; after a restart the device restores the last state. The device also withdraws the tick by itself if the contactor does not report back or a board finds no phase. The event log then names the reason, see MSG-90, “Contactor off! Reason: Channel Board”, MSG-91, “Contactor off! Reason: External Safety Circuit” and MSG-92, “Contactor off! Reason: No phase despite command”. The ladder diagram shows how it fits together, Figure 26.