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Contacts and Coils in PLC Ladder Logic

S Bharadwaj ReddyDecember 13, 2018December 13, 2018

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

What is Ladder Diagram Programming ?

S Bharadwaj ReddyDecember 13, 2018March 21, 2019

Ladder Diagram (LD) Programming The most common language used to program PLCs is Ladder Diagram (LD), also known as Relay Ladder Logic (RLL). This is a graphical language showing the

History of Programmable Logic Controllers (PLC)

S Bharadwaj ReddyDecember 13, 2018May 8, 2019

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 ReddyDecember 12, 2018May 7, 2019

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 ReddyDecember 12, 2018December 12, 2018

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

Basics of PLC Programming

S Bharadwaj ReddyDecember 12, 2018December 14, 2018

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

Siemens PLC Comparator Logic

S Bharadwaj ReddyNovember 19, 2018March 21, 2019

Siemens PLC Comparator Logic This article shows the different types of Siemens PLC Comparator Logics and their ladder diagrams. Problem Description Implement equal, not equal, greater or equal, less or

Introduction to PLC Ladder Diagrams

S Bharadwaj ReddyFebruary 10, 2016March 21, 2019

As an introduction to ladder diagrams, consider the simple wiring diagram for an electrical circuit in Figure 1.1a. The diagram shows the circuit for switching on or off an electric

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