Siemens SIMATIC S7-1200 Function Manual page 140

Using PID_3Step
5.3 PID_3Step V1
Procedure
Proceed as follows to use the analog input value without processing:
1. Select the entry "Input_PER" in the drop-down list "Input".
2. Select "Instruction" as source.
3. Enter the address of the analog input.
Proceed as follows to use the processed process value in floating point format:
1. Select the entry "Input" in the drop-down list "Input".
2. Select "Instruction" as source.
3. Enter the name of the variable in which the processed process value is saved.
Position feedback V1
Position feedback configuration depends upon the actuator used.
● Actuator without position feedback
● Actuator with digital endstop signals
● Actuator with analog position feedback
● Actuator with analog position feedback and endstop signals
Actuator without position feedback
Proceed as follows to configure PID_3Step for an actuator without position feedback:
1. Select the entry "No Feedback" in the drop-down list "Feedback".
Actuator with digital endstop signals
Proceed as follows to configure PID_3Step for an actuator with endstop signals:
1. Select the entry "No Feedback" in the drop-down list "Feedback".
2. Activate the "Actuator endstop signals" check box.
3. Select "Instruction" as source for Actuator_H and Actuator_L.
4. Enter the addresses of the digital inputs for Actuator_H and Actuator_L.
Actuator with analog position feedback
Proceed as follows to configure PID_3Step for an actuator with analog position feedback:
1. Select the entry "Feedback" or "Feedback_PER" in the drop-down list "Feedback".
– Use the analog input value for Feedback_PER. Configure Feedback_PER scaling in
– Process the analog input value for Feedback using your user program.
2. Select "Instruction" as source.
3. Enter the address of the analog input or the variable of your user program.
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the actuator settings.
Function Manual, 03/2017, A5E35300227-AC
PID control