S
I have seen two kinds of control schemes commonly used to start and stop motors from a control system such as a PLC or a DCS. One uses separate contacts for Start & Stop. The Start contact is pulsed Close to start the motor and the Stop contact is opened to stop the motor.
This uses two Discrete Outputs from the system.
The other uses a single N/O contact which is Closed to Start and Opened to Stop. This uses a single Discrete Output from the system. Obviously the second scheme halves the I/O required for operating motors.
I was hoping the illustrious members of the Automation List would be able to share their thoughts on which system is better.
Regards
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Sumeet Chimalkar
This uses two Discrete Outputs from the system.
The other uses a single N/O contact which is Closed to Start and Opened to Stop. This uses a single Discrete Output from the system. Obviously the second scheme halves the I/O required for operating motors.
I was hoping the illustrious members of the Automation List would be able to share their thoughts on which system is better.
Regards
---------------------
Sumeet Chimalkar