بسم الله الرحمن الرحيم Advanced Control. Discrete forms of PID controllers. Reference: A. Visioli, Practical PID Control , Springer 2006. Computer Control.
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Discrete forms of PID controllers
Reference: A. Visioli, Practical PID Control, Springer 2006
The computer requests a value from the A/D converter. The A/D converter samples the process signal, converts it to a number, and stores it in the computer memory or a register.
The computer performs the control calculations on the sampled process signal(s) and computes the output(s) to the process.
The computer output is sent to the D/A converter, which converts it to an electronic signal, updates the output, and holds it constant until the next update.
A good rule of thumb is that the sample time should be about one-tenth of the effective process time constant
Sampling Time : Ts , Number of Sampling : k , Time : t = kTs