PLC control system design steps in detail - what are the seven design step

with the development of technology, the application of PLC is more and more widely, it is necessary for us one step closer to understanding of PLC controller, this article is of the seven design step of PLC control system.

7 steps of PLC control system design steps:

the first. Familiar with the controlled object, make control plan

analysis process and the working characteristics of controlled object, understand the controlled machine, electricity, liquid between cooperate, to determine the controlled object to the control requirement of the PLC control system.

according to the requirements of the system control, determine the input for the user ( Such as buttons, trip switch, switch, etc. ) And output devices ( Such as the contactor, solenoid valve, signal lamp, etc. ) Determine the PLC I/O points.

the third. Choose PLC

when the choice model mainly includes PLC, capacity, I/O module, the power of choice.

4. Allocation of PLC I/O address

according to the production site equipment needs, determine the control button, selector switch, contactor, electromagnetic valve, the signal light is all sorts of input and output devices such as the model, specification and quantity; Listed according to the selected PLC model input/output devices and the PLC input and output terminals of the table, in order to draw PLC external I/O wiring diagram and programming.

5. Design software and hardware of PLC controller program design, carries on the control cabinet ( A) Such as hardware design and site construction.

due to program and the hardware design can be simultaneously, therefore, can greatly shorten the design cycle of PLC control system, and to relay system must be designed after all of the electrical control circuit design to construction.

6. On-line debugging

online debugging refers to the simulation debugging through the application of online tracking. In the beginning, not to take the output device ( Contactor coil, signal lights and other load) For debugging. The monitoring function of programmer, segmented debugging method. All the parts after debugging to normal, with actual load operation. If do not conform to the requirements, adjust the hardware and the procedure. Usually only need to modify the part program, all after the debugging, commissioning. After a period of time running, if working properly, the program does not need to modify the program should be solidified in the EPROM, in case the program is missing.

7. Finishing technology file

including design manual, electrical installation drawing, electrical component list and instruction manual, etc.

all in all, design PLC application system, the first is the function of PLC application system design, namely according to the requirements of the controlled object function and process, a clear system must do work and therefore essential condition. Then analyzed the function of PLC application system, by analyzing the system function, put forward the structure of PLC control system, control signal type and quantity, scale, layout of the system. Finally according to the result of system analysis, the determination of the specific PLC model and specific configuration of the system.

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Compare the various types of that are available. At Coolmay PLC, the range is constantly being updated with new models, technical details and competitive prices.
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