The meanings of P, I, and D for pneumatic control valves in PLCs
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In my understanding, P represents the amplitude of the valve； I is the reaction time ； D is the amount of advance or delay
P is a proportion that is adjusted according to the magnitude of the deviation; the greater the deviation, the higher the output； I is the integral, which is adjusted based on the presence or absence of deviation; an output is generated as long as there is a deviation. D is the derivative, which adjusts according to the rate of change of the deviation; the faster the rate of change of the deviation, the greater the output, and no output is generated when there is no change in the deviation.
What kind of deviation does \"deviation\" refer to? The deviation of the control valve?
Pneumatic control valves in PLCs??? confusing! !
The regulator measures the difference between the signal and the setpoint signal.
Different systems have different interpretations
What does that mean? “Different systems have different interpretations”? Isn’t that how all systems with automated control are explained? Is there any other explanation?
P is proportion, I is integration, D is differentiation,
It can be understood as P reflecting the amplitude of valve oscillation, I reflecting the response time, and D reflecting the delay or lag
It’s not entirely accurate, but non-professionals can understand it this way.
As long as it is a control loop, it generally has three parameters: P, I, and D. The actuator can be an electric valve, a pneumatic valve, a solenoid valve, an inverter, a power regulator, or something similar, depending on the specific circumstances.