With the increase of power field equipment, the requirements for various data collection and monitoring are becoming increasingly strict. The amount of transmitted data becomes larger and the speed becomes faster. Not only the data flow and direction need to be effectively controlled and monitored, but also the data processing capacity needs to be improved. More departments need to understand the status of data transmission. Needs are also indispensable. All of this is to ensure the safety and efficiency of the entire system. Introduction of DCS system DCS , the so-called distributed control system, or the distributed system in some materials, is a new computer control system relative to the centralized control system. It is developed on the basis of the centralized control system. Evolved. In terms of system functions, the difference between DCS and centralized control system is not big, but the realization method of system functions is completely different. For the DCS system network, it must meet the real-time requirements, that is, complete the transmission of information within a certain time limit. The "determined" time limit mentioned here means that in any case, information transmission can be completed within this time limit, and this time limit is determined according to the real-time requirements of the controlled process. Therefore, the measure of the network performance of the system is not the speed of the network, that is, the number of bits per second, but the real-time nature of the system network, that is, how long it can ensure the transmission of the required information is completed. The system network must also be very reliable, no matter under any circumstances, the network communication can not be interrupted, so the DCS of most manufacturers use a double bus, ring or double star network topology. In order to meet the system scalability requirements, the maximum number of nodes that can be accessed on the system network should be several times larger than the actual number of nodes used. In this way, on the one hand, new nodes can be added at any time, on the other hand, the system network can also be operated in a lighter communication load state to ensure the real-time and reliability of the system. During the actual operation of the system, the online and offline connections of various nodes may occur at any time, especially the operator station. In this way, network reconstruction will be carried out frequently, and this operation must not affect the normal operation of the system. Therefore, the system The network should have a strong online network reconstruction function. Secondly, this is a network node that completely handles on-site I / O and implements direct digital control functions. Generally, a set of on-site I / O control stations should be set up in a set of DCS to share the I / O and control functions of the entire system. This can not only avoid the failure of the entire system due to the failure of one site, improve system reliability, but also enable each site to share data collection and control functions, which is conducive to improving the performance of the entire system. The operator station of DCS is a network node that handles all man-machine interface functions related to running operations. Part 1: Functional requirements 1. According to the provided structural diagram, select the corresponding product, the number of ports meets the actual needs of the system, and the network requires redundancy; 2. The multi-mode optical fiber is required for the cascade between distant sites and each unit subsystem; 3. Star or ring network structure. Part 2: Network topology Datang Power Generation is one of the largest independent power generation companies in China. As of the end of 2007, it had put into operation 20,134.7 MW of power generation equipment. The control system transformation of the power plant was provided by Foxboro DCS system. The control station, data server, operation station and engineering station are connected by Hengqi managed switches. In this DCS, the solution features include: 1. Support port VLAN and IEEE 802.1Q VLAN, improve network performance, security and manageability 2. Multicast control and Port Priority settings, limit broadcast and multicast information on the network to the greatest extent, improve network reliability and work efficiency. 3. Through the RingOn function, the ring network self-healing time is less than 15ms, thereby ensuring the real-time and reliability of the network. 4. Redundant low-voltage AC and DC Power Supply, easy to use and high reliability. 5. Support user-defined alarms, and can be sent via Email to provide operators with real-time alarm information. 6. Strong resistance to electromagnetic interference Basic topology 3. Function description of managed switch 1) Compatible with 10BASE-T / 100BASE-TX / 100BASE-FX; 2) The electrical port automatically recognizes the direct connection or cross line (Auto-MDIX); 3) Wide range low-voltage AC or DC redundant power connection; 4) RapidRingTM rapid ring network redundancy technology, network interruption recovery time is less than 300ms; 5) Trunking high-speed trunk redundancy technology, network interrupt recovery time is less than 10 ms; 6) With VLAN, QoS, rate limit, port security, error alarm and other management functions; 7) Fastening size, nail rail or panel installation; 8) Industrial grade EMC, CE mark, UL508 industrial control equipment certification; 9) c-UL certification, C22.2 CSA No. 14-M91, industrial control equipment certification.
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