机电一体化毕业设计论文-plc控制的饮料瓶自动装箱系统

机电一体化毕业设计论文-plc控制的饮料瓶自动装箱系统内容摘要：

most all of the electrical plant in the production of PLC devices. PLC has as an independent industrial equipment were included in the production of modern electronic control devices bee the dominant. Programming controller39。 s name evolved from the PLC know the historical development, programmable logic controller features constantly changing, and its name evolved through the following process: Early product name for Programmable Logic Controller (programmable logic controller ), Or PLC, the main alternative of traditional relay access control systems. With the development of microprocessor technology, programmable logic controller function also constantly increase, which will programmable logic controller (PLC) can not describe its multifunctional characteristics. 1980, the United States Electrical Manufacturers Association (NEMA) give him a new name Programmable Controller, referred to PC. 1982, the International Electrotechnical Commission (IEC) specifically for the PLC under a strict definition. However, the abbreviated name PC at home has long been a personal puter (Personal Computer) a synonym for, in order to avoid confusion in terminology, so the domestic apparent early that the abbreviated name PLC programmable logic controller, but this does not mean that only a PLC Logic function. 4. PLC has been the definition of programmable logic controller in development, so far, failed its final definition. . Electrical Manufacturers Association NEMA (National Electrical Manufacturers Association) in 1980 to the PLC made the following definition: programmable logic controller is a digital electronic devices, which use a programmable memory to Storage instructions, such as the logic used to implement the order, timing, counting and calculation functions and, through digital or analog input and output to control all kinds of machinery or production process. If a digital puter to the implementation of the PLC function , Was also deemed as PLC, but does not include drum controller or mechanical order. International Electrotechnical Commission (IEC) in November 1982 issued a programmable logic controller first draft of the draft standards, 1985 1 , Also issued a second draft, in February 1987 presented the third draft. In the draft of the PLC is defined as: 南通职业大学毕业设计 6 programmable logic controller is a digital puting operation of electronic systems, designed for use in industrial environments designed using a programmable memory, used in its The implementation of internal storage logical, sequential control, timing, counting and arithmetic operations, such as useroriented mand and, through digital or analog input / output and control v。