Issues regarding the setpoint signal and feedback signal of control valves
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I’m seeking advice from experts. Our company plans to handle both the setpoint signal and the feedback signal for the control valve on the DCS, and we want to use only one pair of wires (two conductors). I wonder if this is possible.
No. . . The valve position setpoint signal for the control valve is at point AO, while the feedback signal from the control valve is at point AI. How should they be connected?
A single pair of wires won’t work; the input and feedback are two separate signals, so at least two wires are required. . .
Valves with FF or HART communication, along with DCS cards, can be used, but the cost is much higher than that of ordinary 4–20MA signals.
It’s impossible to achieve this; the locator command and feedback are two separate signals
It seems not to work; there are two sets of signals~
Why do this? Ugh, satellites can already be put into orbit; it should be possible to achieve this, but is it really necessary?
In my opinion, it is entirely possible to use smart valve positioners with the HART protocol, as these positioners are equipped with microprocessors that enable the transmission of the displacement signals (in digital form) of the control valve to the DCS system or a personal computer via the HART communication protocol, allowing for two-way communication.