How does solenoid valve power supply?
The signal line of the valve position switch comes from the field and is connected to the DO card of the DCS.
DCS output of the DO signal to be connected in series in the relay loop, is in the DCS cabinet between the internal wiring, and then control the relay to the field solenoid valve to power
One is the 220 volt power line of the solenoid valve, and the other is the signal line of the valve position switch.
Supply and demand two, two core cable to the site can be.
