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Introduction to Modbus and Modbus Function Codes

Introduction to Modbus and Modbus Function Codes

Modbus is one of the oldest industrial communication protocols still in use today. Continue reading to find out how the protocol works and how to use it for monitoring and control.


Count Up (CTU) Instructions on an Arduino OpenPLC Simulator

Count Up (CTU) Instructions on an Arduino OpenPLC Simulator

DC motors are an old technology still commonly used in industry. This hands-on article shows how to implement a Count Up (CTU) counter on an Arduino OpenPLC Simulator to control a low-voltage DC motor.


Safety Devices - The When, How, and Why

Safety Devices - The When, How, and Why

Machine safety design can be a daunting task with all the different safety devices on the market today. Choosing the correct device for your design can be made easier by understanding when to use the proper device.


Introduction to Network Switches for Industrial Applications

Introduction to Network Switches for Industrial Applications

Industrial network switches connect automation equipment, controllers, and other such devices. Learn about unmanaged, managed, and PoE enabled switches, as well as the differences between switches, routers, and hubs.


What’s the Difference Between a Safety Contactor and a General Purpose Contactor?

What’s the Difference Between a Safety Contactor and a General Purpose Contactor?

Designing a system with motor motion always includes a consideration of safety. Incorporating safety contactors might be the correct prevention to protect equipment and users but may add additional challenges.


Power Supplies: Understanding the Differences Between Linear and Switching

Power Supplies: Understanding the Differences Between Linear and Switching

Linear and switch-mode power supplies provide direct current to power control components and electrical devices. Learn about the differences between the two power supplies and which one is best for your control system.


Electronic Datasheet (EDS) Files: Why do We Use Them?

Electronic Datasheet (EDS) Files: Why do We Use Them?

Many control product manufacturers offer these downloadable ‘EDS files’ for peripheral equipment, but what exactly is an EDS, and how can they aid in the development of a project?


Teardown: What’s Inside a Timer Relay?

Teardown: What’s Inside a Timer Relay?

PLCs and microprocessors have largely replaced timing functions in control circuits. But these timer relays still hold many necessary tasks. What’s inside these devices might be more complex than you imagined!


Teardown: What’s Inside a 3-Phase Induction Motor?

Teardown: What’s Inside a 3-Phase Induction Motor?

Coil, field winding, rotor, stator, eddy current… When it comes to motors, there are numerous terms that describe the theory of operation, but what is inside a 3-phase motor? Take a look, and learn how they work.


Teardown: What’s Inside a Pneumatic Solenoid Valve Bank?

Teardown: What’s Inside a Pneumatic Solenoid Valve Bank?

Air power drives a lot of modern equipment. Robot grippers, ejectors, actuators, and rotary tables are just a few of the devices controlled by air. What’s inside those banks of solenoid valves, and how do they work?


PLC Program Commands: Arrays Part 3, Searching and Sorting

PLC Program Commands: Arrays Part 3, Searching and Sorting

Learn how to streamline your ladder logic by searching and sorting arrays with the FSC and SRT instructions in the Rockwell (Allen-Bradley) Studio 5000 programming software.


Know Your Phase: How and When to Use a Motor and Phase Rotation Tester

Know Your Phase: How and When to Use a Motor and Phase Rotation Tester

Connecting a new motor without knowing the phase rotation of the electrical supply can cause damage to expensive equipment. By using a 3-phase rotation meter, you can save yourself time and money.


What You Need to Know: Variable Frequency Drives (VFDs)

What You Need to Know: Variable Frequency Drives (VFDs)

With precise control abilities to manage speed, torque, and direction, variable frequency drives remain one of the most common methods of driving 3-phase industrial motors. Below, we introduce a few leading VFD manufacturers.


Introduction to Functional Safety (IEC 62061) and its Implementation

Introduction to Functional Safety (IEC 62061) and its Implementation

Functional safety is the safety of a system and is critical for industries such as medical devices, automotive, railways, and machinery. This article will focus on functional safety for machinery and the standards that help its implementation.


Feedback for Fluid Cylinders: Bang Bang Control

Feedback for Fluid Cylinders: Bang Bang Control

Tracking the position of a hydraulic or pneumatic cylinder is often accomplished at a basic precision level, detecting only end stop limits with discrete digital values… But what methods accomplish this?


Life on the Farm: Cleaning Stalls, Milking Cows, and… Robots?

Life on the Farm: Cleaning Stalls, Milking Cows, and… Robots?

Learn how one small farm in a rural community is upgrading production with advanced technology in several ways to overcome staff shortages, product demand, and regulatory compliance.


Configuring a Network With Pneumatic Valve Manifolds

Configuring a Network With Pneumatic Valve Manifolds

There are many distributed fieldbus capabilities for valve manifolds that can save on network overhead and wiring. In this article, we will look at PLC programming of fieldbus manifolds highlighting Festo's CPX layout.


Controlling Hydraulic Devices with Open and Closed Loop Systems

Controlling Hydraulic Devices with Open and Closed Loop Systems

What if you could control the end position and the speed of a hydraulic actuator accurately with just a simple signal? Some systems use simple open/close valves, but others require far more precision.


Up Close and Personal With Automated Ag Equipment

Up Close and Personal With Automated Ag Equipment

Our Control Automation engineering staff got the chance to visit a commercial farm in North Dakota and learn the hardware and software making these huge automated tractors ready for high-tech ‘field’ work.


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?