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Data Control Instructions
Section 3-18
PID Action
PID action combines proportional action (P), integral action (I), and derivative
action (D). It produces superior control results even for control objects with
dead time. It employs proportional action to provide smooth control without
hunting, integral action to automatically correct any offset, and derivative
action to speed up the response to disturbances.
Direction of Action
When using PID control, select either of the following two control directions. In
either direction, the MV increases as the difference between the SV and the
PV increases.
• Forward action: MV is increased when the PV is larger than the SV.
• Reverse action: MV is increased when the PV is smaller than the SV.
0
0
0
0
Ramp response
Step response
PD action
P action
D action
Td: Derivative time
Manipulated
variable
Deviation
Manipulated
variable
Deviation
Derivative Action
PD Action and Derivative Time
0
0
0
0
PID action
I action
P action
D action
Step response
PID action
I action
P action
D action
Ramp response
Manipulated
variable
Manipulated
variable
Step Response of PID Control Action Output
Ramp Response of PID Control Action Output
Deviation
Deviation
Summary of Contents for SYSMAC CS1D-CPU**
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Page 29: ...xxx...
Page 185: ...146 List of Instructions by Function Code Section 2 4...
Page 1389: ...1350 CJ series Instruction Execution Times and Number of Steps Section 4 2...
Page 1390: ...1351 Appendix A ASCII Code Table ASCII SP Four leftmost bits Four rightmost bits...
Page 1391: ...1352 ASCII Code Table Appendix A...