Siemens SIMATIC S7 User Manual

Notes on Controller Settings
IP244
C79000–B8576–C860–02
4–136
Influence of the proportional band on the control action
X
P

Band Control action
Breadth of
fluctuation
Switching
frequency
Larger More stable, slower Smaller Greater
Smaller Less stable to unstable Larger Lower
Feedback and controlled systems
Controlled
variable
Type of controlled system T
u

or T
t

1)
T
g

or T
s

2)
V
max.

= D

D

Tempe-
rature
Small electrically heated oven
Larger electrically heated
annealing furnace
Large gas heated annealing
furnace
Distillation tower
Autoclave (2.5m
3
)
HighĆpressure autoclave
(1000 °C, 40 bar)
Super heater
Room heating
0.5 to 1 min
1 to 5 min
0.2 to 5 min
1 to 7 min
0.5 to 0.7 min
12 to 15 min
30 s to 2.5 min
1 to 5 min
5 to 15 min
10 to 60 min
3 to 60 min
40 to 60 min
10 to 20 min
200 to 230 min
1 to 4 min
10 to 60 min
1 °C/s
0.3 °C/s
0.1 to 0.5 °C/s
2 °C/s
1 °C/min
Flow Pipeline (gas)
(liquid)
0 to 5s
0
0.2 to 10s
0
-
Pressure Gas pipeline
Boiler gas
or
oil heating
Boiler with beater mills
0
0
1 to 2 min
0.1s
150s
2 to 5 min
-
-
-
Container
level
Boiler 0.6 to 1 min - 0.1 to 0.3 cm/s
rpm Small electric drive
Large electric drive
Steam turbine
0
0
0
0.2 to 10s
5 to 40s
-
-
-
50 min
-1
Electrical
voltage
Small generators
Large generators
0
0
1 to 5s
5 to 10s
-
-
1) T
t
= Dead time 2) System constant

Siemens SIMATIC S7 Specifications

General

Brand	Siemens
Model	SIMATIC S7
Category	Controller
Language	English