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Contactors versus Relays - Differences and Applications

Contactors versus Relays - Differences and Applications

Although the are similarities in operating theory, relays and contactors are used in industrial circuits for different specific applications, and should not be used interchangeably.


Robots and CNC Machines - An Assembly Configuration Made in Heaven

Robots and CNC Machines - An Assembly Configuration Made in Heaven

Our own Control Automation engineering staff had the opportunity to visit VersaBuilt, a CNC robotic integration shop offering an application system from the Universal Robots UR+ series.


Hysteresis - Error and Compensation in Control Systems

Hysteresis - Error and Compensation in Control Systems

Hysteresis is a term introduced in basic control system courses and listed on sensor datasheets, but the terms is not often understood, with error deriving from both the system itself as well as the sensor.


Siemens SIMATIC PLCs - Hardware History

Siemens SIMATIC PLCs - Hardware History

In the first article of this series, we investigate Siemens as a major PLC manufacturer, learning about the hardware, software, and key applications of each product lineup.


Defining Scalar and Vector Control in VFD Outputs

Defining Scalar and Vector Control in VFD Outputs

Two common methods exist for driving induction motors with VFDs - linear scalar control, which is often labeled as V/f, and vector, or field-oriented control, which can be a bit more complex to understand.


Introduction to Safety Relays

Introduction to Safety Relays

Redundancy and safety are often seen together in industrial safety systems. Safety relays monitor emergency devices to switch contacts based on status - but what makes them different from normal relays?


How-To: Programming with IO-Link Devices

How-To: Programming with IO-Link Devices

Advanced features such as programmable limits, diagnostics, and remote configuration are available with IO-Link devices. Learn how to connect an example IO-Link block into an actual PLC project.


Linear Position Sensors - Control is Only as Precise as the Feedback

Linear Position Sensors - Control is Only as Precise as the Feedback

Linear position sensors are used in electrical and fluid-actuated motion devices. They allow extremely precise position, velocity, and acceleration control, and provide feedback to ensure product quality and tolerance compliance.


Web-Based Industrial HMIs: What’s The Difference?

Web-Based Industrial HMIs: What’s The Difference?

With the increasing appearance of “web-based” HMIs, we investigate these devices, learn how they differ from the graphical HMIs, and see implications for our modern control system architecture.


DC Motors - Why Are We Still Using Them?

DC Motors - Why Are We Still Using Them?

AC motors are common throughout industry - easily controlled by VFDs and without the maintenance that comes with DC brushes. So then, why are DC motors still used in certain applications?


Overcoming Challenges with Automated WMS

Overcoming Challenges with Automated WMS

In this article, learn about different challenges that warehouse systems can face and how automation helps solve them.


Info Byte: What’s the Deal With Debouncing Switches?

Info Byte: What’s the Deal With Debouncing Switches?

Before digital control systems, responses were fairly slow. Push a button, and a motor contactor engaged. These days, the speed of computers introduces some new challenges but brings solutions as well.


How-To: Building a PLC Project with Modbus Communication

How-To: Building a PLC Project with Modbus Communication

Modbus is a communication protocol stemming from the early days of Modicon PLCs, but is still common today. These two example implementations of Modbus transactions will get you started.


Characteristics of Highly Automated WMS Systems

Characteristics of Highly Automated WMS Systems

This article explores various characteristics that are common in advanced and highly automated warehouse management systems (WMS).


Info Byte: Preventing Relay Burnout with Flyback Diodes

Info Byte: Preventing Relay Burnout with Flyback Diodes

Inductive loads, such as solenoids and contactors, can cause arcs and failures back into electromechanical switching devices, causing costly downtime. The solution is cheaper than you think.


Combating That Killer of Industrial Pneumatic Systems - Water

Combating That Killer of Industrial Pneumatic Systems - Water

Moisture inside industrial pneumatic systems is a major cause for concern, and if the air is not filtered or dried properly, it can lead to serious failures.


Troubleshooting for PLC Modules and I/O Devices

Troubleshooting for PLC Modules and I/O Devices

Failures of I/O systems are a common source of headache for control engineers. Troubleshooting those devices that have polarized connections (source vs sink, and NPN vs PNP) is a technique worth refining.


My First Experience Programming a Collaborative Robot

My First Experience Programming a Collaborative Robot

We've read about the capabilities of collaborative robots, but often, one question still remains - how do you program a cobot? Last week, I got a chance to get my hands on a cobot for the first time.


How to Best Use PLM in Automation

How to Best Use PLM in Automation

Product lifecycle management (PLM) and industrial automation are growing closer together. This article explores recent trends and application examples of this software in industry.


SPC Pillar: Design of Experiments (DoE)

SPC Pillar: Design of Experiments (DoE)

The fourth pillar of effective statistical process control (SPC) is the use of designed experiments used to learn as much as possible from a limited number of experiments, yet remain statistically relevant enough to be useful.