Panasonic FP-E Programming Manual page 1027

Explanation of parameters
Control mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
Select the type of PID processing and auto-tuning on/off with the H constants.
Control mode
Derivative type
Proportional−
derivative type derivative type
Auto-tuning
The optimum values for the Kp, Ti, and Td of the PID parameters can be measured by measuring the process
response. When auto tuning is executed, the estimated results are reflected in the parameter area after auto
tuning has been completed. (There may be cases in which auto tuning cannot be executed, depending on the
process. If this happens, processing returns to the original parameter operation.)
For precautions concerning execution of auto tuning, refer to the following page.
Reverse operation and forward operation
These parameters determine whether the output will increase or decrease when a change occurs in the
process.
Reverse operation
If the measured process value decreases, the output will increase. (Example: Heating)
Forward operation
If the measured process value increases, the output will increase. (Example: Cooling)
Derivative type PID and proportional−derivative type PID
When the set value is changed, the output changes.
Derivative type
In general this produces a large change when a set value is changed, however, convergence is fast.
Proportional−derivative type
In general this produces a small change when a set value is changed, however, convergence is slow.
Set value (SP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
Set the target value which determines the amount of process control within the following range.
K0 to K10000
Measured value (PV)
3
Input the current process control value with the A/D converter. Adjust so that it falls within the following range.
K0 to K10000
Output value (MV)
4
The result of PID processing is stored. Use the D/A converter or other device to output it to the process.
K0 to K10000
Output lower limit value
5
K0 to K9999 (< upper limit value)
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Reverse operation
Forward operation
Reverse operation
Forward operation
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Value of [S]
Auto−tuning
when not executed
H0
H1
H2
H3
High−level Instructions
[S]
Auto−tuning
when executed
H8000
H8001
H8002
H8003
[S+1]
[S+2]
[S+3]
[S+4]
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