MVME162P-344SE MOTOROLA
Due to the development of computer integrated chip technology, the price of memory has fallen, therefore, for the normal operation of application projects, the memory capacity of PLC is generally required, and at least 8K memory is selected according to 256 I/O points. When complex control functions are required, large capacity and high grade memory should be selected.
(5) Selection of redundant functions
1. Redundancy of control units
(1) Important process units (including memory) and power supply shall be 1B1 redundant.
(2) When necessary, the hot spare redundant system composed of PLC hardware and hot spare software, 2 or 3 redundant fault tolerant system can also be selected.
2. Redundancy of I/O interface units
(1) The multi-point I/O card of the control loop should be redundantly configured.
(2) The multi-point I/O card of important points can be redundantly configured. 3) According to the need for important I/O signals, can choose 2 or 3 heavy I/O interface units.
(6) Economic considerations
When choosing a PLC, the price-to-energy ratio should be considered. When considering the economy, the extensibility, operability, input-output ratio and other factors of the application should be considered at the same time, and the comparison and consideration should be made to finally select the more satisfactory product.
Input and output points have a direct effect on prices. Each additional piece of input and output card requires an additional fee. When the number of points is increased to a certain value, the corresponding memory capacity, rack, mother board, etc., should also be increased accordingly, therefore, the increase of the number of points has an impact on the selection, memory capacity, control function range and other choices. In the estimation and selection should be fully considered, so that the whole control system has a more reasonable cost of energy.
This paper analyzes the electromagnetic interference and its interference mechanism to PLC control system, points out that the anti-interference ability of control system must be considered comprehensively in engineering application, and puts forward several effective anti-interference measures.
1 Overview
With the development of science and technology, the application of PLC in industrial control is more and more extensive. The reliability of PLC control system directly affects the safe production and economic operation of industrial enterprises, and the anti-interference ability of the system is the key to the reliable operation of the whole system. The various types of PLC used in the automation system, some are centrally installed in the control room, some are installed on the production site and various motor equipment, most of them are in the harsh electromagnetic environment formed by the strong current circuit and the strong current equipment. To improve the reliability of PLC control system, on the one hand, PLC manufacturers are required to improve the anti-interference ability of equipment; On the other hand, it requires great attention in engineering design, installation, construction and use and maintenance, and multi-party cooperation can perfect the problem and effectively enhance the anti-interference ability of the system.
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