描述

CBL-YRC061-1

PLC是一種監(jiān)控裝置,為了監(jiān)視及控制各項機電等設(shè)備,當然必須與那些設(shè)備有相互溝通的方式.在這些機電設(shè)備的世界里,人類發(fā)明了各種形式的訊號,以作為它們之間的溝通媒介.目前來說,人們研發(fā)出來的各種偵測如:溫度,濕度,壓力等自然現(xiàn)象的偵測元件,都是將所測得的數(shù)據(jù)轉(zhuǎn)換為線性對應(yīng)的電流信號,通常是4~20mA.PLC接受這樣的信號,就可依據(jù)電流的大小而知道偵測器偵得的目前狀況.Pulse(脈沖)信號是一種形式的接點信號.它的意思是每”達到條件”時,接點會閉合一次.例如:某個轉(zhuǎn)輪式的流量計,可能被設(shè)計成–當它計算出水流累計量達到一度時,就將輸出接點閉合一次.至于所謂的RS232訊號,乃是指一種”通訊”的方式(RS232是一種電氣規(guī)格).以上所提的各種信號都是電氣形式的訊號.而且每個信號都需要獨立的線路來作傳遞.通訊的方式,則可以把它當作設(shè)備用”交談”的方式來做溝通.它們彼此間以一串行的數(shù)值信號來組成所要傳遞的資料,使得多樣化的資料能夠借由一組通訊線路來達成.4~20mA算是通用規(guī)格.另外常見的還有0~20mA.另外還有電壓式的:0~5V,1~5V,0~10V,等等.當然還有以其他形式來表達自然環(huán)境中各種”連續(xù)性”數(shù)值的方式,像是:電阻式,以及其他變化應(yīng)用.總之呢,4~20mA的規(guī)格最多.但是,事實上,4~20mA的電流信號,在進入電路板時,還是會串上一個250或500歐姆的電阻,而獲得一個1~5V或2~10V的電壓,然后再由A/D(類比/數(shù)位)轉(zhuǎn)換IC得到一個對應(yīng)的數(shù)值.這個”5V”或”10V”的原因,乃是人們研發(fā)出來的A/DIC最容易且廉價的關(guān)系而已.至于為何以電流的方式較多,因為4~20mA控制電流不易因傳送距離較長而導致訊號衰減。

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主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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