Panasonic FP-E Programming Manual page 1031

3) Derivative operation
Derivative operation generates an output which is proportional to the derivative time of the input.
Setting signal SV
+
−
Measurement
de
signal PV
mD=TD・
dt
e
The advancing characteristic of derivative control alleviates the adverse effect which the delaying
characteristic of the process exerts on control.
Derivative control grows stronger as the derivative time (Td) is increased.
In the case of pure derivative operation, control can temporarily become ineffective if noise is input, and this
can have an adverse effect on the process being controlled. For this reason, incomplete differential operation
is executed.
e
4) PID operation
PID operation is a combination of proportional, integral, and derivative operation.
Offset e
Setting signal SV
+
−
Measurement signal PV
If the parameters are set to the optimum values, PID control can quickly bring the amount of control to the
target value and maintain it there.
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Offset e
Derivative
operation
mD
mD
+
Integral
+
operation
+
Derivative
operation
Output mD
Output MV
Kp
High−level Instructions
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