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Data Control Instructions
Section 3-18
• When there is broad hunting, or when operation is tied up by overshooting
and undershooting, it is probably because integral action is too strong.
The hunting will be reduced if the integral time is increased or the propor-
tional band is enlarged.
• If the period is short and hunting occurs, it may be that the control system
response is quick and the derivative action is too strong. In that case, set
the derivative action lower.
3-18-2 PID CONTROL WITH AUTOTUNING: PIDAT(191)
Purpose
Executes PID control according to the specified parameters. The PID con-
stants can be autotuned.
This instruction is supported by the CS1-H, CJ1-H, CJ1M, and CS1D CPU
Units only.
Ladder Symbol
Variations
Applicable Program Areas
When P is narrowed
Control by measured PID
SV
Control by measured PID
(when loose hunting occurs)
Enlarge I or P.
SV
Control by measured PID
(when hunting occurs in a short period)
Lower D.
SV
PIDAT(191)
S
C
D
S: Input word
C: First parameter word
D: Output word
Variations
Executed Each Cycle for ON Condition
PIDAT(191)
Executed Once for Upward Differentiation
Not supported.
Executed Once for Downward Differentiation Not supported.
Immediate Refreshing Specification
Not supported.
Block program areas
Step program areas
Subroutines
Interrupt tasks
Not allowed
OK
OK
Not allowed
Summary of Contents for CJ1G-CPUxx
Page 3: ...iv N o t i c e ...
Page 5: ...vi ...
Page 21: ...xxii Conformance to EC Directives 6 ...
Page 35: ......
Page 1131: ...1110 CJ series Instruction Execution Times and Number of Steps Section 4 2 ...