一、接近開關型號怎么看
接近(jin)開(kai)關的型號由以下幾個部分組成:
1、首先第一部(bu)分的字母是接(jie)近開(kai)(kai)關的代(dai)(dai)(dai)號,這(zhe)個代(dai)(dai)(dai)號是表(biao)示(shi)接(jie)近開(kai)(kai)關的類型,比如LJ代(dai)(dai)(dai)表(biao)的是電感式(shi)(shi)接(jie)近開(kai)(kai)關,CJ代(dai)(dai)(dai)表(biao)的是電容式(shi)(shi)接(jie)近開(kai)(kai)關,SJ代(dai)(dai)(dai)表(biao)的是霍爾式(shi)(shi)接(jie)近開(kai)(kai)關等。
2、第二部分代(dai)表(biao)了接近開關的結(jie)構形(xing)式,比如M代(dai)表(biao)了圓柱形(xing),B代(dai)表(biao)了小方(fang)形(xing),D代(dai)表(biao)了普通型(xing)等。
3、第三部(bu)分(fen)是(shi)(shi)指接近(jin)開(kai)關的感應形(xing)式(shi)(shi),另外后面的型號還(huan)有代表檢測距離的參數(shu)、電源種(zhong)類等。尤其(qi)是(shi)(shi)對使用的朋友要(yao)注意最后一(yi)(yi)項參數(shu)的含義,它代表的是(shi)(shi)輸(shu)(shu)出的形(xing)式(shi)(shi),一(yi)(yi)般(ban)接近(jin)開(kai)關有兩種(zhong)輸(shu)(shu)出形(xing)式(shi)(shi),一(yi)(yi)種(zhong)是(shi)(shi)NPN輸(shu)(shu)出的,另一(yi)(yi)種(zhong)是(shi)(shi)PNP輸(shu)(shu)出的,在使用時要(yao)注意。我們從(cong)接近(jin)開(kai)關命名(ming)與型號含義可以看出它的規定(ding)還(huan)是(shi)(shi)比較麻煩的,
比如LJM18T-5Z/NK這種(zhong)接(jie)(jie)近(jin)開(kai)關就代表(biao)了(le)(le)(le)一(yi)(yi)種(zhong)電感(gan)式接(jie)(jie)近(jin)開(kai)關,它(ta)的(de)(de)(de)外形(xing)是(shi)(shi)(shi)M18說(shuo)(shuo)明(ming)是(shi)(shi)(shi)圓形(xing)的(de)(de)(de),T說(shuo)(shuo)明(ming)是(shi)(shi)(shi)埋入式的(de)(de)(de)感(gan)應形(xing)式。后(hou)(hou)面(mian)的(de)(de)(de)5Z又表(biao)示了(le)(le)(le)所能探(tan)測的(de)(de)(de)距離是(shi)(shi)(shi)5mm,最后(hou)(hou)一(yi)(yi)項是(shi)(shi)(shi)NK它(ta)代表(biao)了(le)(le)(le)這種(zhong)接(jie)(jie)近(jin)傳感(gan)器是(shi)(shi)(shi)一(yi)(yi)種(zhong)NPN的(de)(de)(de)常開(kai)型(xing)接(jie)(jie)近(jin)開(kai)關。其實這些都不用(yong)(yong)記,用(yong)(yong)到的(de)(de)(de)時候查找使用(yong)(yong)手冊(ce)就可搞定了(le)(le)(le),包(bao)括它(ta)的(de)(de)(de)接(jie)(jie)線。
二、接近開關pnp和npn的區別是什么
接近開關有NPN輸(shu)(shu)出(chu)型(xing)(電(dian)流(liu)(liu)(liu)(liu)流(liu)(liu)(liu)(liu)入)和PNP輸(shu)(shu)出(chu)型(xing)(電(dian)流(liu)(liu)(liu)(liu)流(liu)(liu)(liu)(liu)出(chu))兩種,當(dang)電(dian)流(liu)(liu)(liu)(liu)流(liu)(liu)(liu)(liu)出(chu)的(de)傳感器(PNP輸(shu)(shu)出(chu)型(xing))在接通時,電(dian)流(liu)(liu)(liu)(liu)是從(cong)電(dian)源(yuan)經傳感器的(de)輸(shu)(shu)出(chu)端(duan)(output)流(liu)(liu)(liu)(liu)到負(fu)載(load)上,進(jin)入負(fu)載,然后流(liu)(liu)(liu)(liu)到接地端(duan)。
而電(dian)流(liu)(liu)流(liu)(liu)入(NPN輸(shu)出(chu)型(xing))的(de)(de)傳(chuan)感(gan)(gan)器(qi)(qi)接(jie)通(tong)時,電(dian)流(liu)(liu)是從電(dian)源經負載流(liu)(liu)到傳(chuan)感(gan)(gan)器(qi)(qi)的(de)(de)輸(shu)出(chu)端(duan)(output),然后(hou)流(liu)(liu)到接(jie)地端(duan)(GND),最后(hou)進入系統(tong)的(de)(de)(GND)。PNP與NPN型(xing)傳(chuan)感(gan)(gan)器(qi)(qi)一般有三條引出(chu)線(xian)(xian),即(ji)電(dian)源線(xian)(xian)VCC、GND,OUT信號輸(shu)出(chu)線(xian)(xian)。
1、信號輸出線連接不同
(1)NPN類,NPN是指當有信號觸發時,信號輸(shu)出線OUT和(he)GND連接。
(2)PNP類,PNP是指當有信號觸發(fa)時,信號輸出(chu)線OUT和VCC連接。
2、輸出信號不同
(1)NPN類接(jie)近(jin)開關。NPN是指(zhi)當(dang)有信號(hao)觸發時(shi),信號(hao)輸(shu)出線out和電(dian)源線VCC連接(jie),相當(dang)于輸(shu)出高電(dian)平的電(dian)源線。
對于(yu)NPN-NO型(xing),在(zai)沒有信號觸(chu)(chu)(chu)發(fa)(fa)時,輸出(chu)(chu)線(xian)(xian)(xian)是(shi)(shi)懸(xuan)空(kong)的,就(jiu)(jiu)是(shi)(shi)VCC電(dian)(dian)源(yuan)線(xian)(xian)(xian)和out線(xian)(xian)(xian)斷(duan)開。有信號觸(chu)(chu)(chu)發(fa)(fa)時,發(fa)(fa)出(chu)(chu)與(yu)VCC電(dian)(dian)源(yuan)線(xian)(xian)(xian)相同的電(dian)(dian)壓,也(ye)(ye)就(jiu)(jiu)是(shi)(shi)out線(xian)(xian)(xian)和電(dian)(dian)源(yuan)線(xian)(xian)(xian)VCC連接,輸出(chu)(chu)高(gao)(gao)電(dian)(dian)平VCC。對于(yu)NPN-NC型(xing),在(zai)沒有信號觸(chu)(chu)(chu)發(fa)(fa)時,發(fa)(fa)出(chu)(chu)與(yu)VCC電(dian)(dian)源(yuan)線(xian)(xian)(xian)相同的電(dian)(dian)壓,也(ye)(ye)就(jiu)(jiu)是(shi)(shi)out線(xian)(xian)(xian)和電(dian)(dian)源(yuan)線(xian)(xian)(xian)VCC連接,輸出(chu)(chu)高(gao)(gao)電(dian)(dian)平VCC。當有信號觸(chu)(chu)(chu)發(fa)(fa)后,輸出(chu)(chu)線(xian)(xian)(xian)是(shi)(shi)懸(xuan)空(kong)的,就(jiu)(jiu)是(shi)(shi)VCC電(dian)(dian)源(yuan)線(xian)(xian)(xian)和out線(xian)(xian)(xian)斷(duan)開。對于(yu)NPN-NC+NO型(xing),其實就(jiu)(jiu)是(shi)(shi)多出(chu)(chu)一(yi)個輸出(chu)(chu)線(xian)(xian)(xian)OUT,根據(ju)需(xu)要取(qu)舍。
(2)PNP類接近開關(guan)。PNP是指當有信號觸發時,信號輸出線out和0v線連接,相當于輸出低(di)電平。
對(dui)(dui)于PNP-NO型(xing),在沒(mei)有(you)(you)信(xin)(xin)號(hao)觸(chu)發(fa)(fa)時,輸出線(xian)(xian)(xian)(xian)是(shi)(shi)懸空的(de),就(jiu)是(shi)(shi)0v線(xian)(xian)(xian)(xian)和(he)(he)out線(xian)(xian)(xian)(xian)斷開。有(you)(you)信(xin)(xin)號(hao)觸(chu)發(fa)(fa)時,發(fa)(fa)出與OV相(xiang)同(tong)的(de)電壓(ya),也(ye)就(jiu)是(shi)(shi)out線(xian)(xian)(xian)(xian)和(he)(he)0V線(xian)(xian)(xian)(xian)連接(jie),輸出輸出低電平OV。對(dui)(dui)于PNP-NC型(xing),在沒(mei)有(you)(you)信(xin)(xin)號(hao)觸(chu)發(fa)(fa)時,發(fa)(fa)出與0V線(xian)(xian)(xian)(xian)相(xiang)同(tong)的(de)電壓(ya),也(ye)就(jiu)是(shi)(shi)out線(xian)(xian)(xian)(xian)和(he)(he)0V線(xian)(xian)(xian)(xian)連接(jie),輸出低電平0V。當有(you)(you)信(xin)(xin)號(hao)觸(chu)發(fa)(fa)后,輸出線(xian)(xian)(xian)(xian)是(shi)(shi)懸空的(de),就(jiu)是(shi)(shi)0V線(xian)(xian)(xian)(xian)和(he)(he)out線(xian)(xian)(xian)(xian)斷開。對(dui)(dui)于PNP-NC+NO型(xing),和(he)(he)NPN-NC+NO型(xing)類似,多出一個輸出線(xian)(xian)(xian)(xian)OUT,及兩條信(xin)(xin)號(hao)反相(xiang)的(de)輸出線(xian)(xian)(xian)(xian),根據需要取(qu)舍(she)。