Pid Control Instruction; F355 (Pid) - Panasonic AFPE224300 User Manual

8.2 PID control instruction

8.2.1 F355 (PID)

- PID control
- Operands
Starting number of PID
S
parameter area (31 words)
- Descriptions
· PID processing is performed to hold the measured value specified by [S+2] at the set value [S+1],
and the result is output to [S+3].
· Derivative control or proportional-derivative control can be selected for the PID processing type.
· Set the PID processing coefficients (proportional gain, integral time and derivative time) and the
processing mode and cycle in the parameter table. PID processing will be performed based on
these settings.
- Types of PID processing
1. Reverse and forward operations
When a process has been changed, whether the output will be increased or decreased can be
selected.
· When the measured value decreases, "Reverse operation" is specified to boost the output
(heating, etc.).
· When the measured value increases, "Forward operation" is specified to boost the output
(cooling, etc.).
2. Derivative type (PI-D) and Proportional-derivative type (I-PD)
Derivative type (PI-D): When a set value is changed, fluctuation in the output is large, however
convergence is fast.
Proportional-derivative type (I-PD): When a set value is changed, fluctuation in the output is small,
however convergence is slow.
- Parameter table settings
* For FP-e, [S+11] to [S+30] (20 words) are used as the PID processing work area.
- Flag conditions
R9007
Turns ON when the value set for the parameter is out of range.
R9008
The area specified using the index modifier exceeds the limit.
(ER)
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WX WY WR WL
N/A N/A N/A N/A
SV EV DT I
N/A N/A A N/A N/A
(A: Available, N/A: Not Available)
(Unit: Word)
Constant
Index
modifier
K H f
N/A N/A N/A
8-3