When connecting a 3-wire field device to your PLC system, it is important to have a solid understanding of sinking (NPN) and sourcing (PNP) concepts. Sinking and Sourcing First, sinking and sourcing are only associated with DC circuits. DC circuits can conduct current in one direction only. This means that it is possible to connect ... Read More
The Technical Support Team at AutomationDirect receives a large number of calls on RLL Plus (Relay Ladder Logic Plus) programming, also known as “Stage” programming. Most of the callers want to understand how and when it should be used. The short answer to the “when” question is that it depends on the process that is ... Read More
Turbine Diagnostic Services (TDS) is a power generation field service company that provides industrial, utility, independent power producers, and municipality power generation systems for turbine generator applications. The company’s TurboNet DASH 1® Control System is a complete DCS-structured turbine generator control system, developed to meet the needs of customers looking for a stable, “crash-free” system ... Read More
Remember when you had to be an artist to design HMI faceplates that resembled your process? Remember configuring your HMI software by filling in cryptic addresses and values, something resembling the Microsoft® Windows™ registry? Remember when your HMI was a dedicated system that only connected to a single process? Or when it was cool to ... Read More
Choices and change are the only constants in control system technologies today. Current industrial controller products can no longer be classified by the internal design architecture they possess. More often than not, any type of modern controller uses some portion of Commercial Off The Shelf (COTS) technology in its CPU, operating system, memory, or data ... Read More
It is said that home is where the heart is. And, the heart of Host Engineering is certainly at home in the rolling foothills of Tennessee on its 50-acre campus. Surrounded by cow pastures and small ponds, the site houses
Ron McVety didn’t have much to start with back in 1987. He had a degree in mechanical engineering, a few years of experience in designing assembly machines for TVs, a spare room, and a vision that everyone can benefit from automation.