Introduction to sequence control!
Before starting the program
I will explain what I have to know at a minimum before actually creating the program. If you are actually writing the program to the PLC, the explanation here is unnecessary. It is for those who begin sequence control now, those who are beginners.
Sequence basics, relay circuit. First of all it is an introduction from here. I will explain it clearly from the beginning. It is difficult to understand ladder diagrams if this is not possible.
Let's receive the input signal from the external device such as the sensor by relay. Once the sensor responds, the relay also ticks.
This is a Japanese reference books.