Siemens SIMATIC S7-1200 Manual page 172

PID is easy
8.3 PID_3STEP instruction
Parameter and type
ManualUP IN
ManualDN IN
ManualValue IN
Feedback IN
Feedback_PER IN
Actuator_H IN
Actuator_L IN
Reset IN
ScaledInput OUT
ScaledFeedback OUT
Output_PER OUT
172
Data type Description
Bool In manual mode, every rising edge opens the valve by 5% of the total
actuating range, or for the duration of the minimum motor actuation
time. ManualUP is evaluated only if you are using OutputPer and if
position feedback is available. Default value: FALSE
If Output_PER is FALSE, the manual input turns Output_UP on for

the time that corresponds to a movement of 5% of the device.
If Config.ActuatorEndStopOn is TRUE, then Output_UP does not

come on if Actuator_H is TRUE.
Bool In manual mode, every rising edge closes the valve by 5% of the total
actuating range, or for the duration of the minimum motor actuation
time. ManualDN is evaluated only if you are using OutputPer and if
position feedback is available. Default value: FALSE
If Output_PER is FALSE, the manual input turns Output_DN on for

the time that corresponds to a movement of 5% of the device.
If Config.ActuatorEndStopOn is TRUE, then Output_DN does not

turn on if Actuator_L is TRUE.
Real Process value for manual operation. Default value: 0.0
In manual mode, you specify the absolute position of the valve.
ManualValue is evaluated only if you are using OutputPer, or if position
feedback is available. Default value: 0.0
Real Position feedback of the valve. Default value: 0.0
To use Feedback, then set Config.FeedbackPerOn = FALSE.
Word Analog feedback of the valve position. Default value: W#16#0
To use Feedback_PER, set Config.FeedbackPerOn = TRUE.
Feedback_PER is scaled, using the following parameters:
Config.FeedbackScaling.LowerPointIn

Config.FeedbackScaling.UpperPointIn

Config.FeedbackScaling.LowerPointOut

Config.FeedbackScaling.UpperPointOut

Bool If Actuator_H = TRUE, the valve is at the upper end stop and is no
longer moved in this direction. Default value: FALSE
Bool If Actuator_L = TRUE, the valve is at the lower end stop and is no
longer moved in this direction. Default value: FALSE
Bool Restarts the PID controller. Default value: FALSE
If Reset = TRUE:
"Inactive" operating mode

Input value = 0

Interim values of the controller are reset. (PID parameters are

retained.)
Real Scaled process value
Real Scaled valve position
Word Analog output value. If Config.OutputPerOn = TRUE, then Output_PER
is evaluated.
Easy Book
Manual, 11/2011, A5E02486774-04