Description
In essence, PLC can only recognize machine language. The reason why it can use some mnemonic language, ladder diagram language, flow diagram language, and even high-level language is due to various software developed for using these languages. Mnemonic language is the most basic and simple PLC language. It is similar to the assembly language of computer, and the instruction system of PLC is expressed in this language. This language only uses text symbols, and the programming tools used are simple, just use a simple programmer. Therefore, most PLCs are equipped with this language.
Ladder diagram language is a graphic language, which uses symbols similar to relay circuit diagram to express the logic relationship of PLC control. This language has a corresponding relationship with the symbol language, which is easy to convert to each other, and is easy for electrical engineers to understand and be familiar with, so it is widely used. Almost all PLCs have developed this language. Because it is expressed in graphics, it is not easy for small programmers to use it. Only programmers with large LCD screen can use it. This language is only used when the computer programs PLC.
The flow chart language is also a graphic language. However, the symbols used are not similar to the symbols of electrical components, but are similar to the flow chart symbols used by computers, so that computer workers can understand and be familiar with them. There is also a one-to-one correspondence between flow chart language and symbol language, but its corresponding symbol language is different from that of ladder diagram. People who are familiar with computers but have not engaged in general electrical work are willing to use this language to program PLC. The F series machine developed by OMRON in Japan uses this language.
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