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现代工业自动化,离不开机械化和自动控制。本文仅着重从自动控制对工业自动化的现状及其市场进行分析探讨。前言早期的机械式钟表,是一种完全靠弹簧(发条)作为动力,采用精密机械传动的自动化装置,对其控制也只能用机械方式,如上发条、拨动指针等来进行。在半导体晶体管面市之前,生产自动化的控制只能由时间常数大、可靠性差及体积庞大的继电器和真空电子管构成的控制线路来完成。半导体晶体管是由美国贝尔试验室发明的,由
Modern industrial automation, can not be separated from mechanization and automatic control. This article focuses only on automatic control of the status quo of industrial automation and market analysis. Preface Early mechanical watches, is a completely spring (clockwork) as a driving force, the use of precision mechanical transmission automation device, its control can only be used mechanical means, such as the winding, dial the pointer to carry out. Prior to the introduction of semiconductor transistors, automation of production control can only be accomplished by control loops consisting of relays and vacuum tubes with large time constants, poor reliability and bulky relays. Semiconductor transistors were invented by Bell Labs in the United States