Using Pid_Compact; Technology Object Pid_Compact - Siemens SIMATIC S7-1200 Function Manual

Using PID_Compact

4.1

Technology object PID_Compact

The technology object PID_Compact provides a continuous PID controller with integrated
optimization. You can alternatively configure a pulse controller. Both manual and automatic
mode are possible.
PID-Compact continuously acquires the measured process value within a control loop and
compares it with the required setpoint. From the resulting control deviation, the instruction
PID_Compact calculates an output value by which the process value is adapted as quickly
and stable as possible to the setpoint. The output value for the PID controller consists of
three actions:
● Proportional action
The proportional action of the output value increases in proportion to the control
deviation.
● I action
The integral action of the output value increases until the control deviation has been
balanced.
● D action
The derivative action increases with the rate of change of control deviation. The process
value is corrected to the setpoint as quickly as possible. The derivative action will be
reduced again if the rate of change of control deviation drops.
The instruction PID_Compact calculates the proportional, integral and derivative parameters
for your controlled system during pretuning. Fine tuning can be used to tune the parameters
further. You do not need to manually determine the parameters.
Additional information
● Overview of software controller (Page 38)
● Add technology objects (Page 40)
● Configure technology objects (Page 42)
● Configuring PID_Compact V2 (Page 73)
● Configuring PID_Compact V1 (Page 96)
FAQ
For more information, see the following FAQs in the Siemens Industry Online Support:
● Entry ID 79047707 (https://support.industry.siemens.com/cs/ww/en/view/79047707)
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PID control