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Mis-conceptions of PLC Ladder Logic

S Bharadwaj Reddy
Perhaps the most important yet elusive concept to grasp when learning to program PLCs is the relationship between the electrical status of the PLC’s I/O points and the status of...

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...

PLC Memory Mapping and I/O addressing

S Bharadwaj Reddy
A wise PLC programmer once told me that the first thing any aspiring programmer should learn about the PLC they intend to program is how the digital memory of that...

Basics of PLC Programming

S Bharadwaj Reddy
In the late 1960’s an American company named Bedford Associates released a computing device they called the MODICON. As an acronym, it meant Modular Digital Controller, and later became the...

Oil and Water Separation Process using PLC Programming

S Bharadwaj Reddy
Oil and Water Separation Process This is PLC Program for automatic water separation process. Problem Description Implement oil and water separation process in PLC using ladder diagram programming language. Problem...

T Flip Flop PLC Ladder Diagram

S Bharadwaj Reddy
T Flip Flop Logic using PLC This is PLC Program to implement T flip flop. Problem Description Implement T flip flop in PLC using ladder diagram programming language. Problem Diagram...

Motor Speed Control using VFD and PLC Programming

S Bharadwaj Reddy
This is PLC Program to control motor speed using VFD drive. Motor Speed Control A VFD drive controls the motor speed. The VFD can be controlled remotely by using PLC/DCS...

PLC Program for Food Processing Industry

S Bharadwaj Reddy
PLC Program Food Processing Industry This is PLC Program to detect burned chips and remove them by using PLC. Problem Description Potato chips are made in company and send to...

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