May I ask about the statistics of the valve’s IO points?
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How many IO points are generally counted for pneumatic valves and electric valves?
It depends on the specific functional requirements you want to achieve in DCS. Take as many as you need! Positioner for pneumatic control valve: AO*1 ； Solenoid valve: DO*actual quantity ； Valve position switch: DI* actual quantity ； Valve position indication: AI*1. . . . . . Electric valve open: DO*1; closed: DO*1 ； Electric control valve: AO*1 ； Electric valve open/close indication: DI*2 ； Electric control valve position feedback: AI*1. . . . . . The above is calculated based on the actual configuration.
It depends on the requirements: AO: 4-20mA for valve position setting; AI: 4-20mA for valve position feedback; DO: open, close, stop; DI: fully open, fully closed, in operation, not in operation, fault
It depends on the actual configuration. . . . . .
In fact, there are many DI parameters for electric on-off valves, such as switch feedback and load current, etc.; these can be selected according to actual needs.
Electric valves generally have DCS open command, DCS close command, valve open feedback, valve closed feedback, DCS/local feedback, and valve fault feedback
It depends on the requirements of your actual project