Archive For: Tech Topics

Decimal Point Manipulation Challenge

Decimal Point Manipulation Challenge

I think we’ve all been confronted with a challenging application at one time or another. In this particular instance, I was contacted by a customer asking for help with an application using a floating-point number that needed four decimal places. Even though the fourth decimal place was not being used, it had to have a ... Read More
 
How to Connect 3-wire Sinking & Sourcing Devices to PLC Input Modules

How to Connect 3-wire Sinking & Sourcing Devices to PLC Input Modules

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
 
Jumping on the “stage” wagon

Jumping on the “stage” wagon

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
 
HMIs and PC Control: Upwardly Mobile With Upscale Connections

HMIs and PC Control: Upwardly Mobile With Upscale Connections

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
 
How to Wire a Motor Starter

How to Wire a Motor Starter

The Technical Support page on the AutomationDirect website is full of valuable information and is available 24/7. The following is referenced from the Technical and Application Notes section. A motor starter is a combination of devices used to start, run, and stop an AC induction motor based on commands from an operator or a controller. ... Read More