Delta PLC Course Dhaka Bangladesh (Lecture-02)

The Working Principles of Ladder Diagram:

The ladder diagram was a diagram language for automatic on developed which is the oldest and most widely adopted language in automation. In the initial l stage, there were only A (normally open) contact, B
(normally closed) contact, output coil, timer and counter…the sort of basic devices on the ladder diagram (see the power panel that is still used today). panels working principles of the traditional ladder diagram and PLC ladder diagram are basically the same. The only difference is that the symbols on the traditional ladder diagram are more similar to its original form, and the PLC ladder diagram adopts the symbols that are easy to recognize and shown on computer or datasheets. In terms of the logic of the ladder diagram