ControlLogix CASE / OF Statement

Introduction to ControlLogix CASE / OF Statement The ControlLogix CASE / OF Statement allows a specific block of code to execute. The block of code that executes depends on the value of a tag. This can also be an expression that returns a value. You can use this statement in Read More »

case of

ControlLogix IF / THEN Statement

Introduction to ControlLogix IF / THEN Statement The most common instruction is the ControlLogix IF / THEN Statement. This is for Structured Text routines. Structured Text is an easy way to program complex algorithms. Additionaly, some vendors prefer to use all structured text routines. One of the reasons to use Read More »

if then

Reducing Cost in Industry

Introduction to Reducing Cost in Industry In this section, we’ll explore some ideas for Reducing Cost in Industry. High costs are frustrating. Especially when inflation is at such a high rate. Extra costs reduce profit. They also slow down the ability for you to upgrade and grow your production. This Read More »

Ricky Arduino

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 »


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

Z80 Pack with Linux

Introduction to the Z80 Pack with Linux In this post, I’ll discuss the Z80 Pack with Linux. This should work with other operating systems such as BSD, OSX, and Windows with Cygwin. The purpose of this post is to simply show you some packages that are in the Z80Pack. There Read More »


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