2711-K5A2【】2711-K5A2
2711-K5A2在歐系產(chǎn)品的有些說(shuō)明書(shū)里面,這個(gè)信號(hào)有時(shí)會(huì)用TTL表示,但是在國(guó)際RS422標(biāo)準(zhǔn)出來(lái)推廣以后,逐漸的也有用RS422表示,并且有些RS422的信號(hào)做到的是5--24V。
2),集電極開(kāi)路信號(hào),(PNP或者NPN),就是簡(jiǎn)單的10-24V的ABZ三根線,沒(méi)有反相信號(hào)。注意這個(gè)信號(hào)有PNP與NPN之分,事實(shí)上確實(shí)就是三極管放大電路,應(yīng)該完全對(duì)應(yīng)接收端匹配。例如NPN的編碼器配NPN的PLC。早先的半導(dǎo)體放大電路的發(fā)展,日本與歐洲各自有所側(cè)重,日本的基本是以NPN結(jié)晶體管放大電路為主,而歐洲的基本是以PNP電路為主,兩者雖然可以用“上拉電阻”采集電壓信號(hào)同樣獲得方波互通,但是通過(guò)這種上拉電阻的方波信號(hào)在高速和干擾雜波的情況下信號(hào)品質(zhì)很差,容易造成誤讀。上拉電阻僅僅是經(jīng)濟(jì)而臨時(shí)性辦法,不應(yīng)一直有用。
集電極開(kāi)路輸出的信號(hào),盡量要與原極性一致的匹配,而不是上拉電阻(編碼器內(nèi)部或PLC內(nèi)部預(yù)先加入的上拉電阻),在編碼器選擇性和PLC的選型是需要特別注意。~~~~~~~~~~~~~~~~~~~~~~~~~~~~
公司 名稱:廈門(mén)泰尼電氣有限公司
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