【正文】 on the small scaled PLC, high speed count, also establish an arithmetic operation on the instruction, pare instruction and PID regulate instruction. The hand hold type plait distance machine that the small scaled PLC use uses big area liquid crystal display can also be with trapezoid diagram and GRAFCET language carry on weaving a distance. The software design of this stage PLC also includes to very greatly improve, widespread carried out a software mold a piece to turn a design, provide on the PLC product in great quantities in general use with the appropriation software function mold piece, the customer adjust to use through a simple function and then can carry out plicated control mission to bring usage tremendous convenience. The plait distance of the usage the machine be more and more perfect, the appropriation plait distance machine is actually already a personal calculator, can carry out an offline plait distance or online plait distance and supervision, the procedure print and the procedure be solid to turn, carry out sketch set Tai, can unite a (namely hang on the PLC work), some plait distance machines can also use deluxe language this help that brought PLC further development very, also make PLC application more extensive. 可設計的邏輯控制器 一個可設計的邏輯控制器 (PLC), 或可設計的控制器是對自動化是二手的一部數(shù)傳計算機工業(yè)的程序 , 像是控制機器在工廠裝配線上。s person － machine to the words means(if keyboard, CRT and speech have a conversation), in recent years because of the spot emergence and related standard establishment of total line principle, and the quick development of product, the PLC bee the spot total line of an importance constitute part, extended PLC applied realm further. Because the PLC raised function with gentle degree in the meantime, make its application quickly increase, and make widely available many other longlost spare parts manufacture industry realm. Later on again expand to and criticize quantity to produce with continuous production line relevant of industrial realm. Along with the CIMS (calculator integration manufacturing system) development, the PLC is still used for factory by people to correspond by letter a work at present in, bee a calculator with other intelligence controllers and calculator system together prehensive control system in of importance constitute part, especially unit class and work station class. From 1969 the first set P L C publish up to now and the programmable controller about experienced three stages: First stage: The PLC capacity of the development is smaller, I/O the point be small at 120: customer saves area capacity or so scan the speed as 20~50 ms K B in the 2 KB s, the instruction is more simple and only have logic an operation and account, count etc., weave distance language to adopt a simple language sentence a predicative speech. Mainly use to make amount of switch a control on the usage. Second stage: The PLC capacity has to expand, the I/O point is from 5121024:00, customer39。t need to be reform or didn39。 There is higher credibility and diagnosis ability, maintain easily。 Build price high. Need and possibility, urge people to look for new exit, the PLC emerge with the tide of the times. It is apply in the car industry in the United States first, the PLC that is at this time uses solid(integration) electric circuit to replace electric circuit after the electric appliances logic and use saving machine electric circuit in of saving digital(procedure)