Technology instructions
10.2 PID control
S7-1200 Programmable controller
624 System Manual, V4.2, 09/2016, A5E02486680-AK
Reaction to error Defines the behavior of the valve when an error is detected or when the PID loop is
reset. If you select to use a substitute position, enter the "Safety position". For analog
feedback or analog output, select a value between the upper or lower limit for the out-
put. For digital outputs, you can choose only 0% (off) or 100% (on).
Scale Position
Feedback
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• "High end stop" and "Lower end stop" define the maximum positive position (full-
open) and the maximum negative position (full-closed). "High end stop" must be
greater than "Lower end stop".
• "High limit process value" and "Low limit process value" define the upper and lower
positions of the valve during tuning and automatic mode.
• "FeedbackPER" ("Low" and "High") defines the analog feedback of the valve posi-
tion. "FeedbackPER High" must be greater than "FeedbackPER Low".
Advanced Monitoring process
Sets the warning high and low limits for the process value.
PID parameters If the user wishes, he can enter his own PID tuning parameters in this window. The
“Enable Manual Entry” check box must be checked to allow this.
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"Scale Position Feedback" is editable only if you enabled "Feedback" in the "Basic" settings.
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