Pid Control - Siemens SIMATIC S7-1500/ET 200MP System Manual

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
PID_Compact
PID_3Step
PID_Temp
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.
Automation system
System Manual, 01/2023, A5E03461182-AK
Description
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
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
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.
System overview
4.8 Technology functions
91