Chapter 15 The PID function of K200S MASTER-K
15-8
15.2.5 Forward / reverse action
1) PID control has two kinds of action, forward action and reverse action. The forward
action makes the PC reaches to SV by outputting a positive MV when the PV is less than SV.
2) A diagram is which forward and reverse actions are drawn using MV, PV, and SV is
shown as figure 15.9.
Fig. 15.9 MV of forward / reverse action
3) The figure 2.10 shows examples of process control by forward and reverse actions,
respectively.
Fig. 15.10 PV of forward / reverse action
Reverse action
Forward action
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