【正文】
一個又一個集散系統(tǒng), 從此過程控制進(jìn)入了集散系統(tǒng)的新時期?! ‰S著計算機(jī)的發(fā)展與網(wǎng)絡(luò)開發(fā)使各控制廠商更多地采用商業(yè)計算機(jī)的技術(shù), 80年代末許多公司推出新一代的集散系統(tǒng), 其主要特征是新系統(tǒng)的局部網(wǎng)絡(luò)采用MA P 協(xié)議?! ∧壳皣鴥?nèi)DCS主要有:新華XDPS,魯能的LN2000,國電智深DCS,中控DCS,和利時DCS,南京科遠(yuǎn)DCS,浙江中自等。 400, Bailey39。s I246。 Intelligent variable reference transmitter with fieldbus structure。s rate, known as bits per second (bps), but the realtime system network, which can ensure the long period of time to plete the required information transmission . System network also must be very reliable in any case, network munications are not interrupted, so most manufacturers of DCS were double bus, ring or dual star network topology. Scalability to meet the requirements of the system, the system can access the network should be higher than the maximum number of nodes in the large number of nodes actually used several times. In this way, one can always add a new node, it can also make the system run in a lighter network traffic load conditions, to ensure that the system realtime and reliability. During the actual operation of the system, each node of the Internet and the net may occur at any time, in particular, operator stations, so that reconfiguration will always be, and this operation must not affect the normal operation, therefore, the system network should have a strong online network reconfiguration functions.Secondly, this is a pletely onsite I / O processing and realization of direct digital control (DDC) feature of network nodes. To set the general scene in a DCS I / O controllers, to share the entire system I / O and control functions. This site can be avoided due to a failure caused by the failure of the entire system, improve system reliability, the site also allows sharing of data acquisition and control functions, will help improve overall system performance. DCS operator station is run operation to deal with all the humanmachine interface (HMIHuman Machine Interface, or operator interface) function of network nodes.DCS engineer station is offline configuration, the system configuration work, and online monitoring, control, maintenance of the network node, and its main function is to provide to the DCS configuration, software configuration tool (ie, the configuration software) and running online in real time DCS DCS network to monitor the operation of each node, the system engineer can engineer station to adjust the system configuration settings and some system parameters, the DCS at any time under the best working condition. And centralized control systems, are required to have all of the DCS system configuration functions, it can be said, no system configuration functions of the system can not be called as a DCS.DCS since its inception in 1975, has already experienced twenty years of development. In two decades, DCS system architecture although there is no significant change, but through constant development and improvement of its functionality and performance have been a huge increase. In general, DCS is toward more open, more standardized product in the direction of development.As the field of process automation puter control system, the traditional DCS is only a narrow concept. If only the production process that DCS automation system, which will lead to wrong conclusions, because the meaning of the puter control system has been greatly expanded, and it includes not only the DCS in the past included a variety of content, but also drill down to the each site measuring equipment, implementing agencies, upwards to the production management, all aspects of business. Traditional DCS now only refers to this part of the production process control automation, and industrial automation system concept, should be targeted to enterprisewide solution, total solution level. Only from this perspective to ask questions and solve problems, to really play the puter automation of its role.DCS has the following characteristics:(1) high reliability. DCS system to control the spread of the puter implementation, the system uses faulttolerant design of the structure, so a puter system malfunction will no