PID


Independent PID with ControlLogix

Introduction to Independent PID with ControlLogix In this section we’ll set up an Introduction to Independent PID with ControlLogix. Realize the equation is different than the dependent mode. For detailed information on the PID instruction, visit the ControlLogix Instruction Set Reference Manual. The PID instruction is in chapter 13. With Read More »

Torque

Tuning a PID for Tank Level

Introduction to Tuning a PID for Tank Level Tuning a PID for Tank Level has some challenges that are different than a standard PID tuning procedure. In the first place, a tank level is not self regulating. It’s an integrating process. In other words, if the system is slightly out Read More »

Tank Level

Troubleshooting PID Loops

Introduction to Troubleshooting PID Loops Indeed troubleshooting PID Loops can be frustrating. It can take time, patience, and knowledge of the process. In this section, we’ll look at a few common issues you might have with PID loops, and how to solve those issues. This is for example only, and Read More »

Derivative too high

Feed Forward for PlantPAx PID

Introduction to Feed Forward for PlantPAx PID With Feed Forward for PlantPAx PID, we can adjust the control variable directly. For example, if the load increases from a tank, we can immediately provide a higher setpoint to the inflow. This can drastically improve response time. Additionally, it will usually reduce Read More »

Disturbance Offset

Cascading PID with PlantPAx

Introduction to Cascading PID with PlantPAx In this section, we’ll cover Cascading PID with PlantPAx. We’ll do this by simulating a level in a tank. The tank controller will change the setpoint of a flow controller. The goal is to maintain a constant tank level. It’s important to realize that Read More »

Cascading PID

Tuning PlantPAx P_PIDE with Simulator

Introduction to Tuning PlantPAx P_PIDE with Simulator Before Tuning PlantPAx P_PIDE, please reset your simulator. This way, we’ll get back to a known configuration. To reset the simulator, use your test button until you get to the reset option. Then press Up then TEST again. In the last sections, we’ve Read More »

PID Settings

Configuring PlantPAx Objects for PID

Introduction to Configuring PlantPAx Objects for PID In this section we’ll be Configuring PlantPAx Objects for PID. In the previous sections, we imported our faceplates. Additionally, we set up our function blocks for PID. Finally, we assocated the faceplates with the function blocks. At this point, we are ready to Read More »

faceplate

Associating PlantPAx Objects for PID

Introduction to Associating PlantPAx Objects for PID When Associating PlantPAx Objects for PID, we simply point our HMI objects to a tag in the processor. Recall that in previous sections, we set up our display screens. We also wrote our logic in function blocks. At this point, we are ready Read More »

Analog Input

Function Blocks for PlantPAx PID

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 »

PID Instruction

Adding PlantPAx Objects for PID

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 »

Flow Screen