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PLC是自动控制应用中一种非常重要的器件，PLC作为一种即时系统有别于个人电脑，传统式以继电器为主的电机控制系统中, 每当变更设计时,整个系统几乎都要重新制作, 不但费时又费力;同时由於继电器还有接点接触不良、磨损、体积大之缺点, 因此造成成本升高、可靠性低、不易检修等问题.为了改善这些缺点,美国DEC在1969年首度发表：可编程控制器(Programmable Controller)。

可编程控制器在发表初期被称为(Programmable Logic -Controller)简称PLC, **的目的是取代继电器，从而执行继电器逻辑及其他计时或计数等功能的顺序控制为主, 所以也称顺序控制器,其结构也像一部微电脑,所以也可称为微电脑可程式控制器(MCPC)。
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IFM EFECTOR 500 PRESSURE SENSOR PN7809 PN-001BRBR18-QF?R...

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