National Instruments 371685C-01 用户手册
Chapter 2
PID Algorithms
2-8
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Note
During tuning, the process remains under closed-loop PID control. It is not
necessary to switch off the existing controller and perform the experiment under open-loop
conditions. In the setpoint relay experiment, the SP signal mirrors the SP for the PID
controller.
conditions. In the setpoint relay experiment, the SP signal mirrors the SP for the PID
controller.
Table 2-6. Tuning Formula under PI or PID Control (Slow)
Controller
K
c
T
i
T
d
P
0.26T
p
/
τ
—
—
PI
0.24T
p
/
τ
5.33
τ
—
PID
0.32T
p
/
τ
4.0
τ
0.8
τ