Siemens Simatic S7-1500 / ET 200MP - PID Control

System overview
4.8 Technology functions
Automation system
System Manual, 01/2023, A5E03461182-AK
91
More information
More information can be found in the function manuals S7-1500T Motion Control
(https://support.industry.siemens.com/cs/ww/en/view/109751049)
4.8.2 PID Control
PID controllers are integrated as standard in all S7-1500 CPUs. PID controllers measure the
actual value of a physical variable, for example, temperature or pressure, and compare the
actual value with the setpoint. Based on the resulting system deviation, the controller
calculates a manipulated variable that causes the actual value to reach the setpoint as quickly
and stably as possible.
You can choose from three different PID technology objects:
PID technology object
Description
PID_Compact
The PID_Compact technology object provides a PID controller with integrated tuning for actua-
tors with proportional action behavior. Different operating modes are possible with
PID_Compact, such as:
• Pretuning
• Fine tuning
• Automatic mode
• Manual mode
PID_3Step
The PID_3Step technology object provides a PID controller with tuning for valves or actuators
with integrating behavior. You can configure the following controllers:
• Three-point stepping controller with position feedback
• Three-point stepping controller without position feedback
• Valve controller with analog output value
PID_Temp The PID_Temp technology object provides a continuous PID controller with integrated tuning.
PID_Temp is specially designed for temperature control and is suitable for heating or heat-
ing/cooling applications. Two outputs are available, one for heating and one for cooling. You
can also use PID_Temp for other control tasks. PID_Temp can be cascaded. You can use
PID_Temp in manual or automatic mode.
Example: PID Control optimizes the drying process
Automation task: Development of a temperature control for drying panes of glass in the
production of mirrors.
Feature: The drying process is a critical phase in silvering mirrors. It is decisive for optimum
product quality. During the silvering process, the glass panes are treated with chemical
solutions and then dried in a pre-heated oven. Temperature control plays a key role in the
drying process.
Solution: A PID controller controls the temperature in the drying oven. The filament of each
infrared lamp in the oven is controlled separately and remotely. Control was previously only
possible manually.