PLC basic instruction system characteristics

PLC programming language, compared with common computer language has distinct characteristics, it is different in a high-level language, also different with the general assembly language, it should not only meet the easy to write, and to meet the requirements of easy to debug. Currently, there is no one for each manufacturer product can be compatible with the programming language. Products such as mitsubishi company has its own programming language, OMRON company's products has its own language. But no matter what type of PLC controller, the programming language has the following features: 1. Figure form command structure: program by the graphic expression, instruction is composed of different graphic symbol, is easy to understand and memory. System software developers have the independent operation of industrial control function into a symbolic figure, user these graphics are combined, according to their own needs and fill in the appropriate parameters. In logical operations section, almost all the manufacturers adopt similar to the ladder diagram of control circuit of relay, it is easy to accept. Like Siemens company also USES the flow chart of control system, it used binary logic element graphic symbols to express the control relation, was very straightforward. More complex arithmetic operations, timing, counting and so on, generally refer to ladder diagram or logic element figure said, symbolic, though less logic operation part, is also popular with the users. 2. Clear variable constant: graphic character is equal to the operation code, regulation the function of operation, the operand filled by the user, such as: K400, T120, etc. PLC of variables and constants and their values range have specific provision, is determined by the product model, please refer to product catalog manual. 3. Simplify the program structure, PLC program structure is very simple, usually a typical block structure, different piece of complete function, make the program debugging of control functions and control sequence to the entire program has a clear concept. 4. Simplified application software generation process: the use of assembly language and high-level language program, to complete the edit, compile, and link the three process, and use the programming language, only need to edit a process, the remaining done automatically by the system software, the whole process of editing in the man-machine dialogue, does not require users with advanced software design capabilities. 5. Improved debugging tool: the assembler, or high level language program debugging, is make editors headaches, and PLC program debugging provides perfect conditions, using the programmer, using PLC and programming on buttons, display and editing, debugging, monitoring, etc. , and with software support, diagnose and debug operation is very simple. Anyhow, PLC controller programming language is user-oriented, the users are not required to have knowledge of the advanced training, don't need a long time.
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