Introduction to Function Blocks for PlantPAx PID In this section, we’ll add our Function Blocks for PlantPAx PID. In our previous sections, we imported the add-on instructions. At this point, we are ready to set up our function block logic. If you have not already done so, created a periodic Read More »
Introduction to Adding PlantPAx Objects for PID In this section, we’ll be Adding PlantPAx Objects for PID. Specifically, we’ll use the P_PIDE instruction. In the last section, we imported objects that we need to get our PID working. Now we’re ready to add those objects to our display. We created Read More »
Introduction to Preparing PlantPAx for PID In this section, we’ll be Preparing PlantPAx for PID. We’ll assume you already have a running PlantPAx project. If not, you’ll have to install PlantPAx using the PlantPAx process library. Be sure your HMI Images, macros, tags, and global objects are imported. You should Read More »
Introduction to PID Zero-Crossing Deadband PID Zero-Crossing Deadband is a method to prevent too much action on the control variable. Particularly, if your process variable is noisy. Too much action on a field device will cause premature wear. This requires extra maintenance, and possibly more downtime. The disadvantage to deadband Read More »
Introduction to PID tuning with Ziegler-Nichols method (rule based variation) In this section, we’ll tune a PID with the Ziegler-Nichols Method. This will be a rule based variation. Previously, we discussed a trial and error based method. Recall that we increased Kc until the loop was unstable. At this point, Read More »
Introduction to PID Feed Forward PID Feed Forward allows you to immediately compensate for a change before Proportional, and Integral have a chance to act. It does this by BIASing the control variable. For example, consider a tank where we need to maintain a constant level. As soon as we Read More »
Introduction to Cascading PIDE (Enhanced) In this section we’ll discuss Cascading PIDE (Enhanced). We’ll set this up using the simulator. We’ll need two simulation units with a 1000uF capacitor across the PV of the flow simulator. Be sure to wire the PV of the flow simulator to the CV of Read More »
Introduction to Tuning the Simulator with an Enhanced PID (PIDE) Instruction There are a few things to keep in mind when tuning the simulator with the Enhanced PID (PIDE) Instruction. First of all, the PIDE uses Function blocks. You will need to make sure you have activated the Function Block Read More »
Introduction to Setting up the PIDE Instruction In this section, we’ll be Setting up the PIDE Instruction for use with our simulator. We’ll simulate a flow control process. To begin with, we’ll leave the simulator settings at default. Be sure to wire the CV from the simulator to an analog Read More »
Introduction to Cascading PID with ControlLogix Cascading PID is when one controller writes to the setpoint of another controller. The controller writing the setpoint is the master controller. Likewise, the PID instruction the master writes to is called the slave controller. Keep in mind that we’ve already set up the Read More »
