Panasonic FP7 Series - Page 493

Setting signal SV
+
-
Measurement signal PV
Deviation e
Integral
Output mi
e
mi
mi=1/Ti ∫edt
● The resulting offset is removed by combining with proportional operation or proportional-
derivative operation.
● The smaller the Ti value, the stronger the action of the integral operation.
(3) Derivative operation
Control operation that produces an output proportional to the time derivative value of the input.
Setting signal SV
+
ｰ
Measurement signal PV
Deviation e
Differential
Output mD
e
mD
mD=TD・
de
dt
● The advancing property of derivative operation reduces the negative effects that the delaying
property of the process has on control.
● The larger the Td value, the stronger the action of the derivative operation.
● Pure derivative operation becomes temporarily inoperative if noise, etc., is input. This has a
negative effect on the controlled process, so incomplete derivative operation is executed.
(4) PID operation
A combination of proportional, integral, and derivative operation is called PID operation.
10.11 PID (PID Operation)
WUME-FP7CPUPGR-12 10-43