Siemens SIMATIC S7 - Page 191

Notes on Controller Settings
4–125
IP244
C79000–B8576–C860–02
OFF
ON


X
Sd
w
Fig. 4.2/1  Characteristics of a 2Ćstep controller
Y
h
= range of manipulated variable
w = reference variable
X
Sd
= hysteresis
Y
h

100 %

Fig. 4.2/2  Control function of a 2Ćstep controller without feedback

T
u
w
T
g
Transient response
without controller
T
u
= delay time
T
g
= response time
X
Sd
= hysteresis
X
Sd

0 %