描述
JZRCR-YPP01-1
PLC是一种监控装置,为了监视及控制各项机电等设备,当然必须与那些设备有相互沟通的方式.在这些机电设备的世界里,人类发明了各种形式的讯号,以作为它们之间的沟通媒介.目前来说,人们研发出来的各种侦测如:温度,湿度,压力等自然现象的侦测元件,都是将所测得的数据转换为线性对应的电流信号,通常是4~20mA.PLC接受这样的信号,就可依据电流的大小而知道侦测器侦得的目前状况.Pulse(脉冲)信号是一种形式的接点信号.它的意思是每”达到条件”时,接点会闭合一次.例如:某个转轮式的流量计,可能被设计成–当它计算出水流累计量达到一度时,就将输出接点闭合一次.至于所谓的RS232讯号,乃是指一种”通讯”的方式(RS232是一种电气规格).以上所提的各种信号都是电气形式的讯号.而且每个信号都需要独立的线路来作传递.通讯的方式,则可以把它当作设备用”交谈”的方式来做沟通.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的规格最多.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最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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主营DCS系统配件
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