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Failsafe Wiring Practices

S Bharadwaj Reddy
Failsafe wiring practice is one of those topics that separates control system designers and electricians from other technical specialties. This is one of the areas that show up as problems...

PLC Digital Signals Wiring Techniques

S Bharadwaj Reddy
Ina process plant, on/off control is done through the PLC or DCS. The below Figure is an overview of one discrete/digital (on/off) circuit, showing the entire process from the power supply...

PLC Analog Signals Wiring Techniques

S Bharadwaj Reddy
Unlike the discrete/digital (on/off) circuit, analog signals vary across a range of voltage or current. Taking the same vessel described previously in Digital wiring example, how would the wiring change...

Contacts and Coils in PLC Ladder Logic

S Bharadwaj Reddy
The most elementary objects in Ladder Diagram programming are contacts and coils, intended to mimic the contacts and coils of electromechanical relays. Contacts and coils are discrete programming elements, dealing...

Normally-Closed Contacts for Stop Buttons

S Bharadwaj Reddy
You may know the difference between normally open and normally closed contacts, but do you know where to use them? This article will teach you where to use normally open...

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