PLC control system design steps -

PLC control system design content

( 1) According to the design specification, process analysis and control scheme is determined, it is the basis of design.

( 2) Choose the input device ( Such as buttons, switches, sensors, etc. ) And output devices ( Such as relay, contactor, indicator light) actuator 。

( 3) Selected PLC models ( Including model and capacity, I/o module and power supply, etc. ) 。

( 4) Distribution of PLC I/o points, draw PLC IO hardware wiring diagram.

( 5) Programming and debugging.

( 6) Work station for the design of the control system, electric control cabinet and install the wiring diagram, etc.

( 7) Write design specifications and use.

the basic principles of PLC control system design 1, maximum limit satisfy the requirement of the controlled object control

give full play to the function of PLC, maximum limit satisfy the control requirement of the controlled object, is the first premise of design of PLC control system, which is one of the most important in the design of the principle. This requires that the designers in the design, before further the field investigation and study, control the scene information collection, collect related advanced domestic and foreign data. At the same time should pay attention to and the scene of the project management, engineering and technical personnel, field operation personnel close cooperation, proposed control scheme, solve key problems in design and problems together.

2, guarantee safety and reliability of PLC control system

PLC control system to ensure safe, reliable and stable operation for a long time, is important principle for the design of the control system. This requires the designer on the system design, component selection, software programming to comprehensive consideration, in order to ensure safe and reliable control system. For example, should guarantee the PLC program not only under the condition of normal operation, and under the condition of abnormal ( Suddenly lost electricity to electricity, button by mistake, etc. ) , also can work normally.

3, simple, economic, convenient use and maintenance to

a new control project is can improve the quality and quantity of products, bring huge economic benefits and social benefits, but the investment of the new project, technical training, equipment maintenance will also lead to increased operating funds. Therefore, under the premise of meeting the control requirement, on the one hand, attention should be paid to continuously expand the benefit of the project, on the other hand also should pay attention to continuously reduce the cost of engineering. This requires that the designers should not only make the control system is simple, economic, and to make the control system using and maintenance convenience, low cost, should not blindly pursue high automation and indicators.

4, adapt to the needs of the development of

due to the continuous development of technology, the requirements of the control system will be constantly improved, the design must be properly when considering the control system for the needs of the development and improvement. This requires the selection of PLC, input and output module, I/o points and memory capacity, with appropriate allowance, in order to meet the development of production and process improvement.

1, PLC control system design steps are familiar with the controlled object, analysis of the controlled process control plan and working characteristics of understanding between the controlled machine, electricity, liquid, determine the controlled object to the control requirement of the PLC control system.

2, determine the IO device 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.

3, choose when the choice of PLC controller mainly includes PLC model, capacity, I/o module, the power of choice.

4, distribution, PLC I/o address, according to the production equipment on site to 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 and 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 of software and hardware of PLC 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, online 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, organize technical documents including design specifications, electrical installation drawing, electrical component list and instruction manual, etc.

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