Recognition of Remote I/O Application in Distributed Control System

Abstract: The information on the re-understanding of the remote I/O application of the distributed control system is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Abstract: This paper analyzes the application status of DCS remote I/O in power plants, expounds the advantages of promoting the use of remote I/O in power plants, and proposes the application range of remote I/O. The development, advantages and existing problems of the existing plug-in bus technology are analyzed, and the current situation is prospected. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the re-understanding of the remote I/O application of the distributed control system. This paper analyzes the application status of DCS remote I/O in power plants, expounds the advantages of using remote I/O in power plants, and proposes the application range of remote I/O. The development, advantages and existing problems of the existing plug-in bus technology are analyzed, and the application prospect of the field bus control system in the power plant is prospected. The most notable feature of the decentralized control system is that it can realize decentralized control functions, decentralized physical locations, and centralized monitoring. However, since the popularization and application of DCS in my country's 300MW units in the mid-1980s, people often only pay attention to the use of DCS control functions to decentralize, but there are various practical applications of physical dispersion, which can obviously save investment and shorten the construction period. Therefore, the huge economic benefits that DCS should generate cannot be fully utilized. 1 DCS layout status and remote I/O application status From the perspective of the DCS layout of units above 300MW that have been put into operation in my country, most power plants have centrally arranged controller processing units and I/O cabinets in the electronic room of the control building , arrange the operator station in the unit control room, the data communication highway connects the controller processing unit c) with the operator station, the data communication cable does not go out of the control building, and all I/O field cables are pulled to the electronic room. of centralized I/0 cabinets. The advantage of this is that the requirements for the protection level of the DCS cabinet are relatively low, and the operation and maintenance conditions are good, but the control floor area is large and the cable investment is large. The practice of distributing the controller processing unit cabinets to the site and connecting each controller processing unit cabinet with communication cables throughout the plant can save a lot of cables, but from the perspective of unit safety, it is considered that the risk is too great to be avoided. consider. Therefore, it is the best choice to arrange the cabinet of the controller processing unit relatively centrally, and adopt the scheme of remote I/O distributed arrangement. The power plant that uses remote I/O to monitor the whole plant and has actual operating performance is the 2X600MW unit of the first-phase project of Zhejiang Beilun Power Plant. The factory has widely used remote I/O in DAS, SCS and BMS. Nearly ten years of experience show that the remote application is successful, and the effect in saving cable investment is also remarkable. However, in the subsequent second phase of the project, the distributed control system only retained the remote I/O of the circulating water pump house, and the remote I/O in the rest of the main powerhouse was canceled. The main reason is that during the construction of the first phase of the project, due to improper construction management, the remote I/O cabinet placed on the site was flooded and some of the cards were damaged. Therefore, in order to avoid similar accidents when determining the design principles of the second phase of the project The occurrence of remote I/O that is scattered in the main building is cancelled. In addition, judging from the situation of other units designed and put into production in China at this stage, except for the DAS part that adopts domestic data mining intelligent front-end devices such as“893 one network”In addition to remote intelligent I/O products, there is no application example of using remote I/O for plant-wide control and monitoring, and most of the reasons are due to concerns about the safety and reliability of remote I/O. Under the situation that the design unit emphasizes controlling the project cost and optimizing the design, as the power construction unit strengthens civilized construction and management, it is necessary for us to re-understand the advantages of DCS physical dispersion and application of remote I/O. 2 Schemes of using remote I/O to realize physical dispersion 2.1 Application scope of remote I/O According to the application scope of remote I/O, the following schemes can be selected: Scheme 1, in DAS, SCS, BMS, MCS four The remote I/O is used in the system. Although there is no instance of using remote I/O in the MCS system at present, it should be fully applicable to MCS in terms of the safety and reliability of the remote I/O. Therefore, the author believes that it can be used in engineering Do a pilot. When equipment and system protection is also implemented by DCS, considering the safety of equipment and systems, the signals related to the protection of boiler and steam turbine equipment should be directly introduced into the DCSI/O cabinet (the I/O cabinet centrally arranged in the electronic room). In order to reduce the variety of spare parts and maintain the consistency of products, it is recommended that the remote I/O should use products from the same DCS factory as much as possible. Scheme 2: Only use remote I/O in the three systems of DAS, SCS and BMS. This scheme has been used maturely, such as the first-phase project of Beilun Power Plant. The principles of equipment and system protection are the same as those of Scheme 1.

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