The 1756-OBV8S Safety Output Card: What a Pulse Test Does to a Contactor
The 1756-OBV8S Safety Output Card: What a Pulse Test Does to a Contactor Point 3 of a 1756-OBV8S flashes red while its output is off, and the contactor it drives is behaving perfectly. That is no-load detection, and it is telling you the truth: something between OUT3-P and the coil has come apart. The detection … Read more