ABB PP846现货

易卖工控网（www.ymgk.com）提供”ABB PP846现货”，产品详情：品牌/厂家：ABB、型号：PP846、成色：全新、货期：现货 1天内发货、保修：180天，更多产品详情就上易卖工控网。

它们彼此间以一串行的数值信号来组成所要传递的资料,使得多样化的资料能够借由一组通讯线路来达成.4~20mA算是通用规格.另外常见的还有0~20mA.另外还有电压式的:0~5V,1~5V,0~10V,等等.当然还有以其他形式来表达自然环境中各种"连续性"数值的方式,像是:电阻式,以及其他变化应用.总之呢,4~20mA的规格多.但是,事实上,4~20mA的电流信号,在进入电路板时,还是会串上一个250或500欧姆的电阻,而获得一个1~5V或2~10V的电压,然后再由A/D(类比/数位)转换IC得到一个对应的数值.这个"5V"或"10V"的原因,乃是人们研发出来的A/DIC容易且廉价的关系而已.至于为何以电流的方式较多,因为4~20mA控制电流不易因传送距离较长而导致讯号衰减。

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