Redundancy and Rationality Analysis of Distributed Control System

Abstract: The redundancy and rationality analysis information of the distributed control system is provided by the excellent flowmeter and flowmeter production and quotation manufacturers. Abstract: According to the characteristics of the distributed control system, this paper analyzes the redundancy configuration and its rationality of the distributed control system from the three aspects of the distributed control system hardware, performance and function. At present, distributed control systems have been applied to all parties in industrial process control. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the redundancy and rationality analysis of the distributed control system. According to the characteristics of the distributed control system, this paper analyzes the redundant configuration and the rationality of the distributed control system from the three aspects of the distributed control system hardware, performance and function. At present, the distributed control system has been applied to all aspects of industrial process control, and the flexibility, diversity and reliability of its control have been proved by practice and recognized by people. However, to design and select a successful distributed control system, the key is to deal with the redundant configuration of the distributed control system. The rationality of redundant configuration directly affects the reliability and engineering cost of distributed control, so how to choose the redundant configuration reasonably is the key to the configuration of distributed control system. The word redundancy comes from the English 'redundancy'. The original meaning refers to the meaning of redundancy, redundancy, surplus, etc. When referring to the distributed control system, it generally refers to the hot standby capability or richness of the hardware performance or function of the control system. However, according to the international common saying, if it refers to the redundancy of the main controller (process controller) of the distributed control system, it refers to the 1:1 online hot standby of the main controller. The redundancy of the distributed control system can be divided into three types of redundancy, namely hardware redundancy, performance redundancy and functional redundancy. The analysis and discussion are carried out separately below. First, the hardware redundancy of the distributed control system The hardware redundancy mainly includes two parts. One part is the redundancy of the internal hardware configuration of the system, including the redundancy of the communication network, the redundancy of the main controller or the redundancy of the I/O card and the redundancy of the external signals. For general distributed control systems, data communication highways and main controllers basically use 1:1 hot standby standard redundant configuration; while the redundancy of I/O cards is due to differences in manufacturers or constraints on engineering costs. There are different processing methods, some adopt n+l backup mode, 3 out of 2 backup mode or 1:1 backup mode, some only use channel backup or configuration optimization mode to ensure the reliability of the main signal, and some do not at all. Use redundant configuration. Another part of hardware redundancy refers to power configuration redundancy. Generally, the power supply redundancy of the distributed control system mostly adopts two-way power supply, that is, dual power supply configuration redundancy. However, due to different manufacturers, the specific configuration is slightly different, such as using dual AC power supply (Figure 1) or one 220VAC, another 220VDC or 110VDC power supply (Figure 2) and so on. The redundant configuration of the power supply should be designed in detail according to the different control objects and the characteristics of the distributed control system itself, and cannot be generalized. The external power supply traditionally uses a single UPS as the upper-level power supply. If the project cost permits, double 100% UPS can also be used as the redundant backup power supply. The traditional single UPS power supply scheme is shown in Figure 3. 2. Performance Redundancy of the Distributed Control System Performance redundancy is mainly the requirement for the affluence of the communication rate, storage capacity and other performance of the distributed control system, and it is to ensure that the peak value of information processing, operation and control of the control system can satisfy the distributed control when the task is busy. Basic requirements for proper functioning of the system. In general, in engineering design, the redundancy requirements of various performance indicators should be strictly controlled and reasonably considered to ensure peak operating conditions and the normal processing capacity of the decentralized control system, otherwise the project cost will increase, affecting the cost and performance. price ratio. In general, the main control indicators of the redundancy of the distributed control system are as follows: (1) The load rate of the communication network of the distributed control system is less than 40%; (2) The average load rate of the main controller of the distributed control system is less than 40%, and the maximum load rate is ≯ 60% ;(3) The average occupancy rate of the memory capacity of the main controller is less than 40%; (4) The power load margin of the distributed control system is 30% to 40%; (5) The number of I/O points is online hot standby >10%; (6) I/O card slot spare > 15%. 3. Functional Redundancy of Distributed Control System Functional redundancy mainly includes two aspects. On the one hand, it is the redundant configuration of function design; on the other hand, it adopts fault-tolerant technology for control technology software to realize fault-tolerant processing of system software and application software, achieve redundancy of system performance, and improve system reliability. For example, in the distributed control system, fault-tolerant and redundant technologies such as the three-to-two or three-to-three processing calculation software of the input switch and analog signals, the disconnection or disconnection protection of the input signal; the self-diagnosis function, expert Redundant technologies such as the analytical redundancy method adopted by the system and CCS control; and the processing of fire extinguishing judgment of furnace flame signals, etc. Distributed control system main controller function configuration,It is the key to the success of the application of the distributed control system. Therefore, attention should be paid to the use of redundant design in the functional design of the distributed control system, which can greatly improve the reliability of the distributed control system and achieve twice the result with half the effort.

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