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中控DCS卡件的发展

2022-04-06 20:11:12 来源:http://www.sdjkyqyb.com/ 53

DCS是中控分布式控制系统的缩写,在国内自控行业又称之为集散控制系统。是相对于集中式控制系统而言的一种计算机控制系统,它是在集中式控制系统的基础上发展、演变而来的.
DCS is the abbreviation of central control distributed control system, which is also called distributed control system in domestic automatic control industry. It is a computer control system relative to the centralized control system. It is developed and evolved on the basis of the centralized control system
首先,DCS的骨架—系统网络,它是DCS的基础和核心。由于网络对于DCS整个系统的实时性、可靠性和扩充性,起着决定性的作用,因此济南汉诺达控科技有限公司都在这方面进行了精心的设计。对于DCS的系统网络来说,它需要满足实时性的要求,即在确定的时间限度内完成信息的传送。这里所说的“确定”的时间限度,是指在无论何种情况下,信息传送都能在这个时间限度内完成,而这个时间限度则是根据被控制过程的实时性要求确定的。因此,衡量系统网络性能的指标并不是网络的速率即通常所说的每秒比特数而是系统网络的实时性,即能在多长的时间内确保所需信息的传输完成。系统网络还需要非常可靠,无论在任何情况下,网络通信都不能中断,因此本公司所经营的的中控、和利时DCS均采用双总线、环形或双重星形的网络拓扑结构。为了满足系统扩充性的要求,系统网络上可接入的节点数量应比实际使用的节点数量大若干倍。这样,一方面可以随时增加新的节点,另一方面也可以使系统网络运行于较轻的通信负荷状态,以确保系统的实时性和可靠性。在系统实际运行过程中,各个节点的上网和下网是随时可能发生的,特别是操作员站,这样,网络重构会经常进行,而这种操作不能影响系统的正常运行,因此,系统网络应该具有很强在线网络重构功能。
Firstly, the framework of DCS - system network, which is the foundation and core of DCS. Because the network plays a decisive role in the real-time, reliability and expansibility of the whole DCS system, Jinan hanorda Control Technology Co., Ltd. has made careful design in this regard. For the system network of DCS, it needs to meet the requirements of real-time, that is, to complete the transmission of information within a certain time limit. The "determined" time limit mentioned here refers to that in any case, the information transmission can be completed within this time limit, which is determined according to the real-time requirements of the controlled process. Therefore, the index to measure the performance of the system network is not the rate of the network, that is, the number of bits per second, but the real-time performance of the system network, that is, how long it can ensure the transmission of the required information. The system network also needs to be very reliable, and the network communication can not be interrupted under any circumstances. Therefore, the central control and Hollysys DCS operated by the company adopt the network topology of double bus, ring or double star. In order to meet the requirements of system expansibility, the number of accessible nodes on the system network should be several times larger than the number of nodes actually 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 run in a light communication load state to ensure the real-time and reliability of the system. During the actual operation of the system, the online and offline of each node may occur at any time, especially at the operator station. In this way, the network reconstruction will be carried out frequently, and this operation can not affect the normal operation of the system. Therefore, the system network should have a strong online network reconstruction function.
其次,这是一种完全对现场I/O处理并实现直接数字控制(DDC)功能的网络节点。一般一套DCS中要设置现场I/O控制站,用以分担整个系统的I/O和控制功能。这样既可以避免由于一个站点失效造成整个系统的失效,提高系统可靠性,也可以使各站点分担数据采集和控制功能,有利于提高整个系统的性能。DCS的操作员站是处理一切与运行操作有关的人机界面(HMI-Human Machine Interface或operator interface)功能的网络节点。
Secondly, this is a kind of network node that completely processes the field I / O and realizes the function of direct digital control (DDC). Generally, a set of DCS shall be equipped with on-site I / O control station to share the I / O and control functions of the whole system. This can not only avoid the failure of the whole system caused by the failure of one station and improve the reliability of the system, but also enable each station to share the data acquisition and control functions, which is conducive to improving the performance of the whole system. The operator station of DCS is a network node that handles all human-machine interface (HMI human machine interface or operator interface) functions related to operation.
工程师站是对DCS进行离线的配置、组态工作和在线的系统监督、控制、维护的网络节点,其主要功能是提供对DCS进行组态,配置工作的工具软件(即组态软件),并在DCS在线运行时实时地监视DCS网络上各个节点的运行情况,使系统工程师可以通过工程师站及时调整系统配置及一些系统参数的设定,使DCS随时处在的工作状态之下。与集中式控制系统不同,所有的DCS都要求有系统组态功能,可以说,没有系统组态功能的系统就不能称其为DCS。
The engineer station is a network node for offline configuration, configuration and online system supervision, control and maintenance of DCS. Its main function is to provide tool software (i.e. configuration software) for DCS configuration and configuration, and monitor the operation of each node on the DCS network in real time when DCS is running online, so that the system engineer can timely adjust the system configuration and the setting of some system parameters through the engineer station, Keep DCS in working state at any time. Different from the centralized control system, all DCS require system configuration function. It can be said that a system without system configuration function cannot be called DCS.
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The above is a detailed introduction about the DCS card of Zhejiang University central control. I hope it will be helpful to you If you have any questions, please contact us We will provide you with professional service http://www.sdjkyqyb.com
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