Can invent the structure of Cheng controller and process designing method

The structure of the structural PLC that can make up Cheng controller includes hardware and software two much. There are 3 links between hardware and control object: The first annulus: It is an operating system, will manage the hardware resource of PLC with it; The 2nd annulus: It is to compile a system, the PLC software system that these two annulus made. The 3rd annulus: It is the applied program that implements user requirement. The hardware principle block diagram of PLC 2.

The echelon of graph of echelon of · of process designing method that can make up Cheng controller pursues (LD -- process designing of Ladder Diagram) law and traditional relay circuit pursues (following plan institute are shown) the design is very similar, will state control task is intuitionistic with circuit element symbol intelligible. Watch of statement of · statement watch also calls an instruction the watch (IL, Instruction List) . Or call instruction predicative character. It is with RD, OR, AND, NOT... the command code that waits for logistic instruction to be a statement, in order to operate the programming language of address or parameter operand. Command code expresses to want the functional kind of the operation, operand expresses where to be operated. Method of this kind of process designing compact, systematization, but more abstract, use echelon chart to amount to first sometimes, write into corresponding statement statement input next. Echelon graph and the law of process designing of relation · advanced language that the statement expresses (wait like C language) ; As the development of numerical control technology, can make up equipment of Cheng controller pilot to already was expanded by stand-alone FMS, CIMS. The information that can compile Cheng controller to handle measures signal, imitate to measure signal, communication to believe an extra except switch, still need to finish with go up a machine or the information exchange that leave an opportunity. The processing of certain information already cannot use the means that carries out orderly, and must use high speed to handle way in real time. Be based on these reasons, the advanced language that computer place uses is cited to come in the applied process of PC stage by stage. Flow chart of system of control of law of · other process designing (logistic function pursues) process designing law; Functional module pursues denotive " functional piece language " process designing law; Be based on a graph denotive " graphical language " process designing law; With show stator programme controll and statement statement are denotive " structural text language " process designing law; Law of logical pattern process designing. CNC Milling CNC Machining