Distributed control system redundancy and its rationality analysis

Abstract: the distributed control system redundancy and its rationality analysis of the information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Abstract: according to the characteristics of distributed control system, based on the distributed control system hardware, from three aspects, such as performance and functional redundancy configuration of the distributed control system are analyzed and its rationality. At present, the distributed control system has been applied to industrial process control of each party. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a distributed control system redundancy and its rationality analysis for details. According to the characteristics of distributed control system, based on the distributed control system hardware, from three aspects, such as performance and functional redundancy configuration of the distributed control system are analyzed and its rationality. At present, the distributed control system has been applied to all aspects of the industrial process control, the control flexibility, diversity, reliability has been proved by practice, and obtained people's approval. However, to design and choose a successful distributed control system, the key is to deal with distributed control system redundancy configuration. The rationality of the redundancy configuration directly affects the reliability of the distributed control and the project cost, so how to choose the reasonable redundancy configuration is the key to the distributed control system configuration. Redundancy is a word derived from the English 'redundancy'. Intention is to point to excess, redundancy, and the remaining meaning, reference to the distributed control system, generally refers to the control system hardware performance or the degree of hot standby power or rich functionality. But according to international practice, if refers to the main controller (distributed control system Process controller) Redundancy, is refers to the main controller 1:1 online hot standby. Distributed control system redundancy can be summarized into three types of redundancy, namely the hardware redundancy, the performance function of redundancy and redundancy. The paper discusses the following respectively. One, the distributed control system hardware redundancy hardware redundancy mainly includes two parts. Part of the internal hardware configuration for the system redundancy, including communications network redundancy, main controller redundancy or I/O card redundancy and redundancy of external signal. For general distributed control system, the data communication highway, main controller basically adopt standard 1:1 hot standby redundancy configuration; And redundancy of I/O card, is due to the difference of the manufacturer or constraints on the project cost, has a different approach, such as some use n + l standby mode, standby mode or 1:1 three choose two standby mode, also some with channel only standby or configuration optimization way to guarantee the reliability of the main signal, some don't use redundant configuration. The other part of the hardware redundancy refers to the redundant power supply configuration. Distributed control system for power supply redundancy generally use two way more power, namely double redundant power supply configuration. But due to the difference of the manufacturer, a slightly different configuration, such as double ac power supply ( FIG. 1) Or all the way along the 220 vac, another 220 VDC power supply (or ll0VDC FIG. 2) And so on. Power supply redundancy configuration according to the different control object and the characteristics of different distributed control system for the detailed design, cannot treat as the same. External power supply traditionally generally USES single UPS as a superior power supply, if the licensing of engineering cost, also can use double ten o % UPS work as redundant backup power supply. The traditional single UPS power solutions as shown in figure 3. Second performance, the performance of the distributed control system redundancy redundancy is mainly on the distributed control system communication rate, storage capacity and other properties of the rich degree requirements, is to ensure that the control system in task busy peak of information processing, computing, control, meet the basic requirement of distributed control system normal function. General, should be strictly controlled in the engineering design, considering the redundancy of various performance indicators are required, to ensure the working condition of the peak and the degree of normal processing capacity of distributed control system, otherwise it will cause the rise of the project cost, cost and performance/cost ratio. In general, the distributed control system are as follows: (the redundancy of the main control indicators 1) Distributed control system communication network load rate < 40%; （ 2) Distributed control system, main controller of the average load rate < 40%, zui high load rate ≯ 60%; （ 3) Main controller memory capacity of the average share < 40%; （ 4) Distributed control system power load margin is 30% ~ 40%; （ 5) I/O points online hot standby > 10%; （ 6) The I/O card slot spare > 15%. Third, the function of the distributed control system redundancy function redundancy mainly includes two aspects of content. On the one hand, for the functional design of redundancy configuration; On the other hand to control technology using fault-tolerant technology, software implementation of system software and application software fault-tolerant processing, to achieve the performance of the system redundancy, improve the reliability of the system. Such as distributed control system input switch and analog signals and take three choose two or three in the processing of the calculation software and the input signal of the wire or broken fault tolerant redundant technology such as lotus root protection; Distributed control system using the self-diagnosis function, expert system, CCS control adopts analytical redundancy method such as redundant technology; And the chamber of a stove or furnace flame signal processing of the judgment of fire, and so on. Distributed control system configuration, main controller function is the key to the success of distributed control system application. As a result, the functional design should pay attention to the distributed control system USES the redundancy design, which can greatly improve the reliability of distributed control system, to achieve the effect of get twice the result with half the effort.

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