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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...

History of Programmable Logic Controllers (PLC)

S Bharadwaj Reddy
Every control system may be divided into three general sections: input devices (sensors), controllers, and output devices (actuators). The input devices sense what is happening in the process, the controller...

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...

PLC Analog I/O and Network I/O

S Bharadwaj Reddy
In the early days of programmable logic controllers, processor speed and memory were too limited to support anything but discrete (on/off) control functions. Consequently, the only I/O capability found on...

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...

PLC Program to Drain Same Products from Two Tanks

S Bharadwaj Reddy
Drain Same Products from Two Tanks This is PLC Program to drain same products from two tanks. Problem Description Two tanks are filled with same products. Draining materials from these...

PLC Program for Alarm Security System

S Bharadwaj Reddy
Alarm Security System This is PLC Program for Alarm Security System. Problem Description Make burglar alarm system program in S7-1200 PLC for the house. Consider one house, in this we...

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