1) Learn the basic principles of PLC,

Hardware: Understand the basic structure of input and output terminals, and be familiar with the basic electrical requirements of ports.

Software: For PLC system, you should know what I/O refresh is, which is the basis of programming, and you should know the working cycle of PLC.

It is suggested to learn the principle and application of programmable controller.

2) Learn basic instructions

You can start with ladder diagram language and practice basic logic instructions first;

Learn all kinds of logical instruction blocks.

It is recommended to study PLC self-study manual.

3) Practice

You can simulate exercises on the simulator: (Generally, PLC programmers have the function of simulation)

Write PLC program, compile and run, and manually input some signals to see if the signal change at the output port meets the program requirements.

Final actual combat.