Siemens v1.0 Wartungshandbuch Seite 163

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Example "PID control"
4.9 Active PID controller in online mode
STEP 7 Basic V10.5
Getting Started, 12/2009, A5E02651459-01
163
4. Perform a fine-tuning of the controller optimization, by starting the tuning in run.
The self-tuning starts. The current work steps and any errors that occur are shown in the
"Status" field. The progress bar shows the progress of the current work step. Several
steps are required for controller optimization. The progress display will start at "0" for
each step. If the self-tuning was completed without error message, the PID parameters
have been optimized. The PID controller switches to automatic mode and uses the
optimized parameters.
5. Monitor the curve shape in the top section of the "Commissioning" window.
Note
Shape of the curve
In time the shape of the curve gets closer and closer to the setpoint. To monitor the
complete shape of the curve, use the vertical scroll bar in the bottom area of the graphic
display.
After the controller has switched to automatic mode, the controller reacts to the
temperature changes simulated by the "PROC_C" block by automatically adjusting the
controlled variable.
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