You will see that the loop is still stable. Change the load on your simulator to 60%. Go back to your trend chart, and observe the result of Kc=1.Īs you can see, the loop seems to stabilize. Once the loop is unstable, we can gather some information to tune the other PID parameters. Our goal is to find out which value of Kc will cause the loop to become unstable. Click the ellipsis on the instruction, and go to the “Tuning” tab. Tuning for Proportional Gain (Kc)Īt this point, we are ready to go back to your PID instruction. At this point, go to the Y axis tab, and choose “Preset” for your scaling.įinally, click the “Run” button to start your trend. Keep in mind that we already set the scaling for each pen. We’ll set up the X axis tab to track a 5 minute period. Also be sure to check the scaling for the Min and Max values. In this case, I’ve set my preferred colors, and width of each pen. Select the Setpoint, Output, and Process Variable from “MyPID” tag. Otherwise choose the controller name if it’s a controller scoped tag. Choose the program that you created your PID tag in (if this is a program scope tag). It’s important to realize that your scope will be different than what is in this documentation. The sample period is how often the tags will refresh. The trend folder resides just above the I/O configuration. Right-click the trends folder to create a new trend. This allows us to track the process variable, control variable, and setpoint.
Trending for Tuning the Simulator with a PID Instructionīefore we begin, we need to set up a trend chart. Assembly Registers and Compatibility Modes.FactoryTalk View SE Trends and Data Log.Beginning a FactoryTalk View SE Project.Derivative Settings for ControlLogix PID Enhanced.Integral Settings for ControlLogix PID Enhanced.Proportional Settings for ControlLogix PID Enhanced (PIDE).Proportional, Integral, Derivative (PID).
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