First of all, buy a book about PLC (it is recommended to buy books on electrical control and PLC application technology). The first half of this book is about some common electrical components and basic circuits in the electric control cabinet, and the second half is about the application of PLC. It should be suitable, but you can go to the bookstore. )

Then I have a PLC in my hand.

Then according to the example in the book, consider a small project to realize a function.

Finally, I learned that I had done a PLC project independently. After finishing PLC, I mastered Siemens 200 series small PLC, which is very suitable for beginners to learn and easy to use.

First of all, we should understand the knowledge of electricians, how to control electrical appliances and various actuators. Then we should understand the working mode of PLC, input and output circuits, and finally understand the corresponding technology.

1. To learn PLC, you must first choose which manufacturer's PLC to learn. The internal software of Japanese PLC has high integration and simple application. Omron and Mitsubishi were widely used in the early days, but now Siemens PLC and Rockwell are widely used because of trade and international cooperation. Although learning a brand is profound, others will soon get started, but people's energy is limited. We must devote our limited energy to the direction with the widest application, the most potential and the most development, but we have a deep understanding of all brands of PLC, including imported PLC and domestic PLC, and have a deep understanding of the characteristics, advantages and disadvantages of each PLC, so we are rare talents in the future market. )

2, PLC is not a single programming technology, it is a system professional course. PLC can be widely regarded as a high-reliability PC with embedded operating system. First of all, we should deepen the programming language ladder diagram and statement table language of PLC itself. At this level, you can only look at the programming program, and you can design some engineering programs. In this industry, VB and v c++ are also needed to realize serial communication and distributed control system. Some large programs also need knowledge of databases. (PLC is quick to get started, but it needs constant efforts. )

3.PLC is a subject that focuses on the application direction. So we should practice more. Don't look down on small projects, in which you can summarize the logical thinking method of designing programs. Make continuous progress in summing up. For example, every time you go to the site for debugging, call the site program to check it out and understand the structure of the program and the differences and characteristics with other programs, so that the progress will be faster. Good luck!