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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...

Automatic Empty Bottle detection using PLC Logic

S Bharadwaj Reddy
Automatic Empty Bottle detection This is PLC Program for Automatic Empty Bottle detection. This logic usually found in packing industries . Problem Description After completion of filling process, the bottles are...

1 to 8 Demultiplexer PLC ladder diagram

S Bharadwaj Reddy
1 to 8 Demultiplexer PLC This is PLC Program to implement 1:8 De-multiplexer. Problem Description Implement 1:8 Demultiplexer in PLC using ladder diagram programming language. Problem Diagram Problem Solution Demultiplexer...

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