The ladder diagram of the PLC can be understood as a programming language like the assembly and other calculator languages, but the scale of use is different! And the general practice is to convert your ladder diagram into C or assembly language (determined by the CPU used by the PLC), and then use the assembly or C compilation system to compile it into machine code! The PLC only runs a few codes. The ladder diagram is only a simple way for the user to use it.
PLC is actually a set of single-chip microcomputers that have been made (single-chip microcomputers have a wide range of systems).
The ladder diagram of the PLC can be understood as a programming language like the assembly and other calculator languages, but the scale of use is different! And the general practice is to convert your ladder diagram into C or assembly language (determined by the CPU used by the PLC), and then use the assembly or C compilation system to compile it into machine code! The PLC only runs a few codes. The ladder diagram is only a simple way for the user to use it.
In the same way, MCS-51 microcontroller can also be used for PLC manufacturing, only 8-bit CPU in some high-end use such as: a large number of operations (including floating point operations), embedded system (now UCOS can also be ported to MCS-51), etc., some powerless. A set of industrial system used by our company is made by MCS-51 microcontroller, but with DSP, it can now meet our requirements (our equipment is slower, and the logic control is the main, but there are a lot of points, 128 points I/O!!), and also use ladder programming, we are converting our ladder diagram into C51 and then using KEIL's C51 for compilation. Haven't you noticed that the different CPUs of the different types of PLCs are used!!
Of course, you can also use a single-chip microcomputer to directly develop the control system, but the requirements for developers are appropriately high (not the general level can be competent), the development cycle is long, and the cost is high (for some large-scale systems, you need to do experiments, and the printed circuit board needs an appropriate fee, you can say that you use an emulator and a breadboard to develop, but I want to inform you that you only verify the feasibility of hardware and software, and do not mean that it can be used in the industrial control system, because the industrial control system has very high requirements for resisting disturbances, Stability first, not function first, so your circuit board planning must be constantly experimented and improved).
Many people think that PLC is very mysterious, in fact, PLC is very simple, and its internal CPU is not as good as ordinary single-chip microcomputer in addition to its speed. Generally, PLC uses 16-bit or 32-bit CPU, with 1 or 2 serial channels to communicate with the outside world, and there is a timer inside.
The key technology of PLC lies in its internal solidification of a program that can interpret the ladder diagram language and auxiliary communication programs, the efficiency of the ladder diagram speech interpretation program determines the function of the PLC, and the communication program determines the difficulty of the PLC to communicate information with the outside world. For simple use, it is generally operated by the method of independent controller, and there is no need to exchange information with the outside world, but only a program that can explain the ladder diagram language is solidified internally.
In fact, the main task of planning a PLC is to develop a program to interpret ladder words.
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