【正文】 replace after the cloth line of electric appliances system, rule a logic relation with the procedure。 Need the kit not standard exterior connects and conditionally once requested to the environment and the spot。 Fall through to have a conversation with calculator. Expect behind till 6039。 The physical volume is big, consume an electricity have another。s angle and that pany lifted to request at 10:00 to the new generation controller and provided an explicit development target for each archduke department. Next year, from the American DEC (numerical equipments pany) developed to succeed first the first set programmable logic controller in the meantime the American MODICON pany also develops 084 controllers. They publish, caused focus attention of whole world, other panies and Western Europe in the United States, Japanese the etc. industry be flourishing nation, also study to develop a product for is similar to one after another. The PLC absorbs microelectronics technique and the calculator technical last word, so develop to quickly automate the whole automation of production line from the single machine very, is go to produce of the whole factory automation, from gentle manufacturing system, industrial robot arrive the large dispersion type control system and the PLC all undertakes to emphasize an important person color. The PLC technique represented nowadays electricity procedure to control of earliest enter level. Equip (like intelligence appearance, numeral turn handbill device, intelligence of the liquid press to patibly move a valve set etc.) with various unit automation through a PLC and the spot total line, calculator work system, constitute car and factory automate of plete system. Usually adopt in the in proper order control realm of industrial control before the PLC invent such as take a reading machine after the electric appliances, drum type switch, paper etc. machine, electricity type the spare part is to control a ponent, particularly is control after the electric appliances, bee the spare part that use most extensively in switch control system in long lost the manufacturing the process the control the realm. But, along with the development of industry modernization, production scale more and more big, labor rate of production and product quality of the request is continuously raising, for control system of the credibility also put forward higher request, originally possessed after electric appliances control system already unwell should need, investigate its reason BE: The action is slowmoving。Programmable logic controller A programmable logic controller (PLC) or programmable controller is a digital puter used for automation of industrial processes, such as control of machinery on factory assembly lines. Unlike generalpurpose puters, the PLC is designed for multiple inputs and output arrangements, extended temperature ranges, immunity to electrical noise, and resistance to vibration and impact. Programs to control machine operation are typically stored in batterybacked or nonvolatile memory. A PLC is an example of a real time system since output results must be produced in response to input conditions within a bounded time, otherwise unintended operation will result. PLC and Programmable Logic Controller are registered trademarks of the AllenBradley Company, although they are widely used generically. Features The main difference from other puters is that PLC