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Fail‑Safe Motor Circuits: When Loss of Power Moves You Toward Safety

Fail‑Safe Motor Circuits: When Loss of Power Moves You Toward Safety

Part 1 of a 2-part series. A practical look at the failures that plague motor drive systems, even those that are rated to be fail-safe.


The Spectrum Between Human and Machine: The Industrial HMI

The Spectrum Between Human and Machine: The Industrial HMI

Although ‘HMI’ has become synonymous with a durable, rugged touchscreen measuring 7 to 21 inches and mounted in a control cabinet door, the reality of the interface extends far beyond this device.


Mitsubishi PLC to VFD Control: RS-485 Communication

Mitsubishi PLC to VFD Control: RS-485 Communication

This guide shows you how to set up RS-485 communication between the FX3U PLC and the FR-D700 inverter with the FX3U-485-BD. You can control speed and monitor the system using ladder logic.


Methods of Controlling Motor Speed With a VFD

Methods of Controlling Motor Speed With a VFD

Motor speed control can be a tricky process, due to the variety of options. In a VFD, speed can be controlled using fixed values, digital or analog signals, or communication networks.


Obtaining System Values in a PLC

Obtaining System Values in a PLC

It’s easy to obtain I/O values for local and remote modules and network nodes. But what about system data that’s built into the PLC? How can we access and use that information?


Synchronized Motion for Servos | Gearing Profile

Synchronized Motion for Servos | Gearing Profile

Synchronized motion has become an industry standard with robots, gantries, and pick and place automation. Follow along this three-part series as we discuss methods of synchronizing servo motors.


Understanding PLC Tags: Controller Scope vs. Program Scope

Understanding PLC Tags: Controller Scope vs. Program Scope

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.


All About The Legendary Stack Light

All About The Legendary Stack Light

The stack light has a simple but powerful purpose: to report the status of the equipment. Follow along as we take a deep dive into the venerable illuminated signal tower.


Methods of Precision Alignment: Mechanical, Laser, and Vibration Analysis

Methods of Precision Alignment: Mechanical, Laser, and Vibration Analysis

Alignment procedures for pulleys and shafts are a key to preventing costly breakdowns. An effective strategy pairs alignment with vibration analysis to both prevent and predict these downtime events.


Control.com Asks the Experts: Serious Questions About Fluid Valves

Control.com Asks the Experts: Serious Questions About Fluid Valves

After working with solenoid valves for many years, there are still a few questions: is AD or DC voltage better? Do we really need lubrication? I turned to an expert for some answers.


Understanding Inputs and Outputs for Servo Drives

Understanding Inputs and Outputs for Servo Drives

Servo drives interact with hardware axes, but there are many ways to configure the motion. I/O signals allow connections of sensors and switches for functions like homing and setting travel limits.


Managing and Configuring Switches for Secure SCADA Networks | Part 2

Managing and Configuring Switches for Secure SCADA Networks | Part 2

Learn about OT resilience strategies, including SSH, authentication, port blocking, and MAC address binding, methods that can be employed to protect network switches.


Factory I/O: A Modern PLC Simulation Tool to Learn the Fundamentals

Factory I/O: A Modern PLC Simulation Tool to Learn the Fundamentals

Finding a good PLC simulator can be challenging. Read an assessment of Factory I/O and learn how it works, how to get started, and how to use it in your automation learning journey.


Remote Industry and the Growing Popularity of Cellular Systems

Remote Industry and the Growing Popularity of Cellular Systems

Previously reserved for personal and commercial deployments, learn how cellular IoT connectivity technologies are influencing industrial trends, organizations, and integrators.


Avoiding SCADA Pitfalls: 3 Tips for Operational and Business Advantages

Avoiding SCADA Pitfalls: 3 Tips for Operational and Business Advantages

A well-designed SCADA system can reduce costs, increase throughput, and improve usability. Successful implementation requires consideration from both an operational and a business perspective.


Analog and Digital Signal Filtering in PLC Systems

Analog and Digital Signal Filtering in PLC Systems

Unexpected, false, and fluctuating PLC input signals can cost many hours of debugging, but luckily, there are some quick, simple tricks to try before downtime is wasted.


Hands-On with the Arduino Opta Using OpenPLC

Hands-On with the Arduino Opta Using OpenPLC

Using an Arduino Opta PLC, a few off-the-shelf electrical components, and the popular OpenPLC software environment, automation control concepts can be built on your own test bench.


Remote Networking: Explaining VPNs for Control Engineers

Remote Networking: Explaining VPNs for Control Engineers

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 Dirty Details of Electrical Power: Line/Load Reactors and Filters

The Dirty Details of Electrical Power: Line/Load Reactors and Filters

Filters and reactors can protect your electrical devices, but what is the difference between these two kinds of devices, and are they supposed to be installed before or after a VFD?


Intro to CODESYS: First Project Using CMZ Hardware

Intro to CODESYS: First Project Using CMZ Hardware

CODESYS is an automation software that is independent from any one vendor, capable of many PLC, I/O, and motion operations. However, being vendor-agnostic can present challenges. Learn how to get started.