PLC PLC to choose a model selection procedures and principles

With the development of PLC technology, the PLC products also more and more. Different types of PLC and its structure, performance, capacity, instruction system, programming method, the price also is different, also each have emphasize particularly on the applicable occasions. Therefore, the reasonable selection of PLC, to improve the technical and economic indexes of PLC control system has important significance. The choice of PLC mainly from PLC models, capacity, I/O module, power module, special function module, communication networking ability by synthetically considering all kinds of aspects and so on. PLC type selection of PLC model selection is the basic principle of meet the function requirement and guarantee under the premise of reliable, convenient maintenance, strive for the best performance/cost ratio. When the choice is mainly consider the following points: ( A) The reasonable structure of PLC are integral and modular structure. Integral PLC every I/O points of the average price is cheaper than that of modular, and the volume is relatively small, generally used in the system process is relatively fixed in the small control system; Flexible and modular PLC function extension, points in the I/O points, input and output points of proportion, the respect such as the types of I/O module choose room is big, and convenient maintenance, generally in more complex control system. ( 2) The choice of the installation of PLC controller system installation is divided into centralized, remote I/O type and distributed many sets of PLC network. Centralized don't need to set up drive remote I/O hardware, system response is fast, low cost; Remote I/O type is suitable for large scale system, system of device distribution range is very wide, remote I/O can be installed near the device at the scene, attachment is short, but need to add drives and remote I/O power supply; Many sets of PLC network distributed applicable to multiple devices independent control respectively, and to connect with each other, can choose small PLC, but must be additional communication module. ( 3) The function of the corresponding general small ( Low) PLC has the logic operation, timing, counting and other functions, the only need to switch quantity control equipment can be satisfied. In the switch quantity control is given priority to, with A small amount of analog control system, can choose to take A/D and D/A conversion unit, which has the function of add and subtract arithmetic, data transfer enhanced low-grade PLC. For more complex control, realize the PID arithmetic, closed loop control, communications, networking, and other functions, visual control size and complexity, choose mid-range or high-end PLC. But the price is more expensive, medium and top grade PLC controller is commonly used in large-scale process control and distributed control system, etc. ( 4) Response speed for general controller of PLC is designed for industrial automation, the response speed of the different grades of PLC are generally can meet the needs of its application range. If you want to cross range using PLC, or certain features or the speed of the signal with special requirements, you should carefully consider the response speed of the PLC, can choose PLC, with high speed I/O functions or have fast response selection module and interrupt input module of PLC, etc. ( 5) The reliability of the system requirements for general reliability of PLC can meet. The high requirement of reliability of system, should consider whether to adopt or hot standby redundancy system. ( 6) Model as far as possible a unified enterprise, should try to be united PLC models. Main problem considering the following three aspects: 1) Models and unified, the module can be as spare, facilitate spare parts procurement and management. 2) Unified model, its function and method of use, beneficial to the improvement of the technology level of training and technical. 3) General model and unified, its external equipment, resources can be Shared, easy networking communication, match after the upper computer is easy to form a multi-level distributed control system.
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