Contacts and Coils in PLC Ladder Logic
The most elementary objects in Ladder Diagram programming are contacts and coils, intended to mimic the contacts and coils of
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What is Ladder Diagram Programming ?
Ladder Diagram (LD) Programming The most common language used to program PLCs is Ladder Diagram (LD), also known as Relay
History of Programmable Logic Controllers (PLC)
Every control system may be divided into three general sections: input devices (sensors), controllers, and output devices (actuators). The input
PLC Memory Mapping and I/O addressing
A wise PLC programmer once told me that the first thing any aspiring programmer should learn about the PLC they
PLC Analog I/O and Network I/O
In the early days of programmable logic controllers, processor speed and memory were too limited to support anything but discrete
Basics of PLC Programming
In the late 1960’s an American company named Bedford Associates released a computing device they called the MODICON. As an
Introduction to PLC Ladder Diagrams
As an introduction to ladder diagrams, consider the simple wiring diagram for an electrical circuit in Figure 1.1a. The diagram