【正文】 blocks, and first of all define it in the E2PROM of the address, and other function blocks and links are expressed with the address. At the same time fill in the required parameters. The work of known configuration, which is different from the language used for programming. Configuration, can be used as maps, which means CAD. For a CAD software that can draw a control loop for each function block and the necessary connection between them. It is known as the engineer station. Use it to the controller configuration. Configuration, the first draw SAMA plan or ISA plan. The use of small function block, the painting SAMA diagram, large functional blocks, the picture ISA plan. 1,Development course of PLC In the course of industrial production, a large number of switch amount orders are controlled, it carries on order movements according to the logic condition , and carry on the control that the chain protected movements according to the logic relation, and the data of a large number of dispersed quantity are gathered . Traditionally, these functions were realized through the pneumatic or electric control system. The Company put forward and replaced the demand which continued the electric control device in . GM in 1968 (General Motors ), in second year, American digital pany develops the control device based on integrated circuit and electronic technology, adopt means of procedure apply electric to control for the first time, this it is first generation that can programme the controller , call Programmable Controller (PC ). After the personal puter ( abbreviated as PC ) develops, for being convenient, in order to reflect the function characteristic of the programmable controller too, can programme controller name Programmable Logic Controller (PLC). The eighties of last century is to the middle period of the 1990s, it was PLC the period with the fastest developing speed, the annual growth kept 300%. This period, PLC is improved by a large margin in power to dispose of analog quantity , digital operation ability , manmachine interface ability and work ability , PLC enters the course controlled field gradually, has replaced and in DCS system ruling position on the course controlled field in some is used. PLC have monability to be strong easy to use meeting surface wide , dependability high , antiinterference ability strong , programming characteristicking such as being simple. The position in PLC is controlled in the industrial automation especially the order is controlled, in foreseeable future, can replace. Composition of PLC Divide from structure, PLC is divided into a regular type and sectional (module type ) two kinds Regular type PLC including CPU board , I/O board , showing the panel , memory lump , power ,etc., these elements are made up into a whole not detachable . Module type PLC includes CPU module , I/O module , memory , power module , the baseplate or the framework, the module can be made up and disposes according to certain rule. Composition of CPU CPU is a core of PLC, functions as nerve center, each set of PLC has one CPU at least, it receives and stores user39。s station and engineer, to finish one39。 2, the warning window: By arranging the time order way (namely the most emerging alarm ranks the top of the window ) and listing the unusual situation appearing in production processes , if number value restricts . Reporting to the police should include time , unusual state and value , confirming by operator and unusual brief illustration to tabulate already of the unusual data to unusually appear 。s station, and can control and regulate the craft course through the input equipment , so as to ensure the security of the production process , reliable , highefficient , high quality. It is colored CRT that operator39。s standing , engineer that can also receive , in order to realize that establishes artificial control or parameter to our station of the scene. 3, calculation and closing ring controlling , in order to control etc. IN realizing the part and automaticallying control in our station , return circuit , algorithm whose some classical algorithm generally, can remove theatrical makeup and costume nonstandard algorithm , plicated algorithm. Operator39。 2, the realtime data gathering our station are sent to operator39。 Facing DCS supervise the administrative staff39。s operator39。中文 6790字 DCS principle and PLC foundation DCS principle Distributed Control System (DCS) carries on the centralism monitor, the operation, the management and the disperser control which is one kind of new control technology using the puter technology to the production process. DCS is base on the puter technology, the signal processing technology, the survey control technology, the correspondence work technology, the CRT technology, the graphical display technology and the manmachine connection technology mutually seeps the development to produce. DCS both is different with the dispersible measuring appliance control, and different with Yuji Chinese type puter control system, but overes the two flaw to concentrate the two superiority, it has concentrated function and so on step less control, batch control, logic sequential control, data acquisition. Basic ponent of DCS The logic structure of the system needs realizing by the physics structure. We can sum up their physics structure as the structure of the type of a gleam of past three simply . first line refers to its skeleton puter work, the three means that join three kinds of different kinds of nodes in the work: Face onthespot I/O which is accused of the course scene to control and stand。 Facing the attenbant39。s station。s engineer standing. I/O controls the station live An onthespot I / O is controlled and stood to finish dealing with and realizing the wor