Should be followed in the design of PLC control system of the basic principles

Any a kind of control system is in order to realize the technological requirements of the controlled system, in order to improve the production efficiency and product quality. Therefore, in the design of PLC controller control system, should follow the following principles: 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 of PLC control system to ensure long-term safe and reliable, stable operation, 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 controller 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. Strive to simple, economic, convenient use and maintenance of 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. To adapt to the needs of the development of due to the continuous development of technology, the requirements of the control system will also continue to improve, to appropriate design considering the control system for the needs of the development and improvement. This requires the selection of PLC, the input/output module, I/O points and memory capacity, with appropriate allowance, in order to meet the development of production and process improvement.
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