Latest Process Control and PID Technical Articles

When setting up a new program in a Rockwell PLC, task scheduling is an important and often overlooked issue where errors…

When setting up a new program in a Rockwell PLC, task scheduling is an important and often overlooked issue where errors appear as inconsistencies, often incorrectly attributed to random faults.

Is it best to ‘controller scope’ or ‘program scope’ your tags? This is the question asked by many new PLC…

Is it best to ‘controller scope’ or ‘program scope’ your tags? This is the question asked by many new PLC programmers, and it often comes down to personal preference.

We know that PID stands for proportional, integral, and derivative, but have you ever seen exactly how the derivative…

We know that PID stands for proportional, integral, and derivative, but have you ever seen exactly how the derivative term affects the final output signal in a motion control system?

Watch how each of the P and I terms influence the output of a motion control system. How do we explain and prevent terms…

Watch how each of the P and I terms influence the output of a motion control system. How do we explain and prevent terms like overshoot, error, and long settling time?

A common field-level protocol for automation is ASi or AS-interface–a method used to convey actuator and sensor data…

A common field-level protocol for automation is ASi or AS-interface–a method used to convey actuator and sensor data and commands between I/O devices and the PLC control system level.

It can be risky to adopt unknown technology; it poses serious security concerns if misused. The Control.com engineering…

It can be risky to adopt unknown technology; it poses serious security concerns if misused. The Control.com engineering team contacted our friends at OnLogic to gain some insight into VPN technology.

The OPC UA protocol is designed to solve two problems in automation: interoperability between device vendors and…

The OPC UA protocol is designed to solve two problems in automation: interoperability between device vendors and independence from incompatible transport layer differences.

Before tuning a motion axis, you must define the axis. If the control system doesn’t understand the axis properties or…

Before tuning a motion axis, you must define the axis. If the control system doesn’t understand the axis properties or specifications, it can’t be expected to effectively complete the tuning process.

In any process industry, transducers are the basic instrumentation unit for continuous monitoring of system variables…

In any process industry, transducers are the basic instrumentation unit for continuous monitoring of system variables that provide inputs for control system algorithms and outputs.

Ladder logic is an industrial control systems legend stemming from electrical line diagrams before the days of PLCs.…

Ladder logic is an industrial control systems legend stemming from electrical line diagrams before the days of PLCs. Although logical, they are difficult to interpret.

Learn how to use analog I/O devices with AutomationDirect’s Productivity series of PLCs and Productivity Suite…

Learn how to use analog I/O devices with AutomationDirect’s Productivity series of PLCs and Productivity Suite software. Wiring, configuring I/O, and programming will be a part of this tutorial.

Learn how to measure temperature using an RTD and a temperature transmitter to convert resistance into common analog…

Learn how to measure temperature using an RTD and a temperature transmitter to convert resistance into common analog voltage or current values for process control.

Many sensors, like prox, optical, and ultrasonic, are familiar to control engineers. More and more modern devices are…

Many sensors, like prox, optical, and ultrasonic, are familiar to control engineers. More and more modern devices are incorporating advanced motion profiles requiring motion sensing in many axes.

Converting different numbering systems is quite common in PLCs and structured text codes. Why? Because people read…

Converting different numbering systems is quite common in PLCs and structured text codes. Why? Because people read decimals. Computers read binary. Processors read sets of bits. Not so simple.

It’s important to consider your PLC tag naming convention when using different styles. Learn when and why you might…

It’s important to consider your PLC tag naming convention when using different styles. Learn when and why you might even use more than one, depending on the circumstances and scope of your project.

Have you ever needed to know the temperature, pressure, flow, or other measurement on location, but the readout is way…

Have you ever needed to know the temperature, pressure, flow, or other measurement on location, but the readout is way off in the control room? Here’s an easy way to add a readout in the field.

Function block diagram (FBD) programming is a common language for PLCs following the IEC 61131 standard. What is FBD, and…

Function block diagram (FBD) programming is a common language for PLCs following the IEC 61131 standard. What is FBD, and how does it differ from the familiar ladder logic programs?

Automation can be inexpensive for small projects by using development boards. This article presents a walkthrough of the…

Automation can be inexpensive for small projects by using development boards. This article presents a walkthrough of the setup and installation steps for the popular Raspberry Pi.

Programmable Logic Controllers (PLCs) are designed as an endlessly-looping program, examining all lines of code as…

Programmable Logic Controllers (PLCs) are designed as an endlessly-looping program, examining all lines of code as rapidly as possible. Following are a few critical tips for when programmers only need to run a series of single operations at startup.