Siemens SIMATIC S7-1200 - 1.4 Basic HMI panels

Principles for control
2.3 Characteristic values of the control section
PID control
22 Function Manual, 03/2017, A5E35300227-AC
Response rate of controlled systems
Controlled systems can be judged on the basis of the following values:
T
u
< 0.5 min, T
g
< 5 min = fast controlled system
T
u
> 0.5 min, T
g
> 5 min = slow controlled system
Parameters of certain controlled systems
Physical
quantity
Controlled system
Delay time T
u
Recovery time T
g
Rate of rise v
max
Temperature
Small electrically heated furnace
0.5 to 1 min
5 to 15 min
Up to 60 K/min.
Large electrically heated annealing fur-
nace
1 to 5 min 10 to 20 min Up to 20 K/min.
Large gas-heated annealing furnace
0.2 to 5 min
3 to 60 min
1 to 30 K/min
Distillation tower 1 to 7 min 40 to 60 min 0.1 to 0.5° C/s
Autoclaves (2.5 m
3
)
0.5 to 0.7 min
10 to 20 min
Not specified
High-pressure autoclaves
12 to 15 min
200 to 300 min
Not specified
Steam superheater
30 s to 2.5 min
1 to 4 min
2°C/s
Injection molding machines
0.5 to 3 min
3 to 30 min
5 to 20 K/min
Extruders
1 to 6 min
5 to 60 min
Packaging machines
0.5 to 4 min
3 to 40 min
2 to 35 K/min
Room heating
1 to 5 min
10 to 60 min
1° C/min
Flow rate
Pipeline with gas
0 to 5 s
0.2 to 10 s
Not relevant
Pipeline with liquid
None
None
Pressure
Gas pipeline
None
0.1 s
Not relevant
Drum boiler with gas or oil firing
None
150 s
Not relevant
Drum boiler with impact grinding mills
1 to 2 min
2 to 5 min
Not relevant
Vessel level
Drum boiler
0.6 to 1 min
Not specified
0.1 to 0.3 cm/s
Speed
Small electric drive
None
0.2 to 10 s
Not relevant
Large electric drive
None
5 to 40 s
Not relevant
Steam turbine
None
Not specified
50 min
–1
Voltage
Small generators
None
1 to 5 s
Not relevant
Large generators
None
5 to 10 s
Not relevant