The 8 strides that are based on PLC to control a system to design suddenly

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On the foundation that knew program structure and process designing method, be about practically writes PLC program. PLC controls a system to design need to experience following processes. (one) analyse object be accusinged and put forward to control requirement labor to be accused the process of the object and working characteristic, understanding is accused between target aircraft, report, fluid cooperate, put forward object be accusinged to control control demand of the system to PLC, dominate program certainly, protocol designs assignment certificate. (2) equipment of output of affirmatory input ／ asks according to systematic control, all input equipment that definite system place requires (be like: Reach all sorts of sensor to wait by switch of button, position, transfer switch) with output equipment (be like: Indicator light of a powerful person of contactor, electromagnetism, signal and other are carried out implement etc) , the input that concerns with PLC certainly thereby / export equipment, in order to determine the I/O check the number of PLC. (3) module of the model that choice PLCPLC chooses to include pair of PLC, capacity, I/O, power source the choice that wait, detailed sees this order the 2nd. (4) allocate I/O to nod and design line of PLC periphery hardware 1.

The I/O feature that assigns I/O stipple to give PLC and the join that input ／ to export equipment pursue or corresponding relation is expressed, this part also can undertake in the 2nd pace. 2.

Picture of circuitry of hardware of design PLC periphery gives the electric circuit picture of systematic other part, include main circuit and did not enter the control circuit that can write Cheng controller to wait. By the I/O join graph of PLC and PLC periphery electric circuit is pursued the electric principle plan that forms a system. Hereto electric circuit has decided systematic hardware. (5) programming 1.

Programming asks according to systematic control, use appropriate design method to design PLC program. The program wants to ask in order to satisfy systematic control to give priority to a line, one by one writes implementation to control function or each each child the program of the task, perfect the function that the system assigns stage by stage. Besides, the program still should include the following content normally: (1) initialization program. After PLC electrify, want to become the operation of a few initialization commonly, to start necessary preparation, avoid systematic happening misoperation. The main content of initialization program has: Wait to certain data division, tally undertake to clear, undertake resumptive to what certain data division requires data, undertake set or restoration to certain relay, undertake indication waiting a moment to certain and initiative condition. (2) detect, breakdown is diagnosed and show wait for a program. These courses are relatively independent, add again when programming is finished basically commonly. (3) protection and linkage program. Protection and chain are the indispensable part in the program, must try to consider seriously. The control logic that because be operated illegally,it can avoid and causes is confused. 2.

The basic idea that program imitate debugs program imitate is, produce the spot with convenient formal imitate actual condition, for the ambient conditions with the moving necessary creation of the program. Differ according to producing the kind of spot signal, imitate is debugged have hardware imitate law and software imitate way two kinds of forms. (1) hardware imitate law is to use device of a few hardware (if use another PLC or parts of an apparatus of a few inputs to wait) the signal of imitate generation spot, connect these signal the input end of PLC system with the means of hard wiring, meantime effect sex is stronger. (2) software imitate law is additional in PLC write a simulator, imitate provides spot signal, its go easily simply, but sex of effectiveness for a given period of time assures not easily. Imitate debugs a process in, can use the method that section debugs, use process designing implement monitoring function. (6) hardware carries out hardware to carry out a respect basically is to undertake controlling ark (stage) the design that waits for hardware and spot construction. Main content has: The electric equipment of the part such as ark of 1) design control and work station decorates graph and installation hookup. 2) designs a system between each part electric interrelate graph. 3) undertakes spot wiring according to construction blueprint, have detailed examination. Because programming and hardware are carried out,can undertake at the same time, because this PLC controls systematic design,cycle can shorten greatly. (7) debugging on-line debugging on-line is to will pass the program that imitate debugs to undertake online all is moved further. Debugging on-line process should successive, join only from PLC input equipment, join again output equipment, receive again on real load undertake debugging stage by stage. If do not accord with a requirement, make to hardware and program adjust. Need to modify halfway program only normally can. Debug entirely after ending, consign tries move. Move through period of time, if work,normal, program does not need to revise, answer to go to program solidify in EPROM, in case the program is missing. (8) arrange and write file of technical file technology to include to design program of list of hookup of graph of principle of manual, hardware, installation, electric component, PLC and operation instruction handbook to wait.

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