Hello Guys,
I'm curious about what E-Stop/Control Power On signals are commonly used on your equipment as Feedback Signals into the PLC. We have a small conveyor system used for educational purposes with an e-stop circuit consisting of 2 E-Stop Pushbuttons, a Safety Relay and a contactor for control and motor Power. Currently we have an NO Signal through the contactor to the PLC to indicate that control power is on. We were also thinking of adding extra NO contacts to each of the E-Stop pushbuttons connected to 24V as inputs to the PLC. This way we can tell if an E-Stop button is still pressed, and which one rather than just if the control power is on. Is this a common solution, and do you think it is necessary? We were going to take a connection directly from the E-Stop Input circuit but it seems the safety circuit that checks the E-Stops uses something like 6V.
Thanks!
I'm curious about what E-Stop/Control Power On signals are commonly used on your equipment as Feedback Signals into the PLC. We have a small conveyor system used for educational purposes with an e-stop circuit consisting of 2 E-Stop Pushbuttons, a Safety Relay and a contactor for control and motor Power. Currently we have an NO Signal through the contactor to the PLC to indicate that control power is on. We were also thinking of adding extra NO contacts to each of the E-Stop pushbuttons connected to 24V as inputs to the PLC. This way we can tell if an E-Stop button is still pressed, and which one rather than just if the control power is on. Is this a common solution, and do you think it is necessary? We were going to take a connection directly from the E-Stop Input circuit but it seems the safety circuit that checks the E-Stops uses something like 6V.
Thanks!