Nyob zoo, peb tau tham txog NPN sensors thiab PNP sensors ntau zaus ua ntej, qhov txawv ntawm ob lub sensors no yog dab tsi?
PNP sensors, tseem hu ua "qhov kev tawm tswv yim", qhov tam sim no ntws los ntawm lub davhlau ya nyob twg, uas yog, qib siab siv tau. Tom qab ntawd nws cov zis voltage yog 24V hauv 24V.
NPN sensor tseem hu ua "kev tawm tswv yim tawm", qhov tam sim no yog ntws los ntawm lub davhlau ya nyob twg, uas yog active tsawg. Ces nws cov zis voltage yog 0V tawm ntawm 24V.
Qhov tseeb, NPN thiab PNP muaj lawv tus kheej cov txiaj ntsig.
Rau PNP, cov tuam txhab European thiab Asmeskas cov tuam txhab dav dav yuav siv nws, dua li ntawm nws qhov kev cuam tshuam kev cuam tshuam muaj zog, vim tias nws qhov ntsuas hluav taws xob tso tawm hluav taws xob yog 24V24V voltage piv rau 0V voltage yog qhov nyuaj dua los ua lwm lub zog. cuam tshuam tawm. Yog li PNP sensor yog ruaj khov dua, cov kev xav tau ntawm lub zog sab nraud tsis siab.
Kuv ib zaug muaj lub zog loj servo lub cev muaj zog cuam tshuam sensor hauv lub Hoobkas, tom qab ntau yam kev ua haujlwm tseem tsis tuaj yeem tshem tawm tag nrho cov cuam tshuam ntawm servo system, thiab thaum kawg lub sensor los ntawm NPN-hom hloov rau PNP-hom ntawm ib ua kom tiav cov tshuaj, yog li qhov zoo ntawm NPN sensors yog dab tsi?
NPN sensor tso zis teeb liab yog {{0}}V, 0V qhov tsis zoo yog yooj yim cuam tshuam nrog, qhov zoo dua yog tias hauv av yuav tsis luv. Yog li txawm hais tias NPN teeb liab kab rau qee qhov laj thawj kev sib cuag nrog cov kab hauv av, yuav tsis ua rau theem dhau los ntawm kev hloov hluav taws xob mus txawv tebchaws lossis kev puas tsuaj, yog li kev hloov pauv me ntsis, tuaj yeem tiv thaiv tau zoo dua.
Qhov tseeb, qhov tseeb ntau lawm tseem tshwm sim vim hais tias cov teeb liab kab ntawm ib tug sensor txuas nrog rau hauv av kab ua rau lub hwj chim mov burnout los yog yav dhau los switching fais fab mov tripped rooj plaub, lub sij hawm no yog lub NPN sensor yuav tsis muaj teeb meem.
Txhua qhov sib txawv peb tuaj yeem xaiv lub sensor raws li qhov xav tau tiag tiag.
Yog li yuav ua li cas paub qhov txawv thiab siv NPN thiab PNP?
Ua ntej tshaj plaws, lub sensor dav dav tau cim rau saum toj, NPN lossis PNP ib hnub ntshiab, tau kawg, muaj qee qhov kev sib tshuam qhuav ntawm lub sensor tsis paub qhov txawv ntawm NPN thiab PNP ntxiv rau qee qhov NPN thiab PNP tuaj yeem hloov mus rau txhua qhov. lwm tus sensors, tab sis hom sensors feem ntau kim dua.
Tsis tas li ntawd, peb tuaj yeem ua raws li PLC cov hlua hluav taws xob kom paub qhov txawv ntawm hom sensor.Thaum lub davhlau ya nyob twg yog 0V, PLC txuas nrog PNP, ces PLC tsuas tuaj yeem tau txais cov teeb liab los ntawm PNP sensors, thiab tsis muaj lus teb. mus rau NPN sensors, thaum rau qhuav junction sensors, feem ntau hais lus, koj tsuas yog yuav tsum tau txuas lub dav dav dav ntawm lub sensor rau 24V, thiab koj tuaj yeem txuas rau PLC ntawm PNP.
Thaum lub davhlau ya nyob twg yog 24V, PLC kev twb kev txuas yog NPN, ces lub PLC tsuas tuaj yeem tau txais lub teeb liab ntawm NPN sensor, tsis muaj lus teb rau PNP sensor, thiab rau qhov sib txuas sensor, feem ntau hais lus, tsuas yog yuav tsum tau txuas lub sensor. cov davhlau ya nyob twg rau 0V, nws tuaj yeem txuas nrog PLC ntawm PNP.
Ntau tus tub ntxhais kawm yuav nug, vim li cas NPN thiab PNP cuam tshuam nrog lub davhlau ya nyob twg ntawm PLC?
Qhov no yog raws li lub hauv paus ntsiab lus ntawm kev ua hauj lwm ntawm PLC cov inputs, PLC yuav ua li cas thiaj li pom tau tias muaj cov teeb liab tawm tswv yim siv tib lub xov tooj?
Cov lus teb yog qhov sib txawv voltage.
PLC yuav tsum kuaj xyuas qhov sib txawv ntawm qhov hluav taws xob kom paub meej tias qhov kev tshawb pom ntawm cov teeb liab tawm tswv yim, thiab cov teeb liab tawm tswv yim tsuas yog ib lub xaim, ces qhov kawg ntawm qhov sib txawv ntawm qhov voltage yog qhov dav dav dav, uas yog rau kev sib piv nrog cov teeb liab tawm tswv yim.
Yog li ntawd, lub {{0}}V lub davhlau ya nyob twg ntawm PNP xav tau lub teeb liab tawm tswv yim yuav tsum tau 24V kom qhib tau, thiab 24V lub davhlau ya nyob twg ntawm NPN xav tau lub teeb liab tawm tswv yim los ua 0V kom qhib tau tom qab ntawd hauv qee qhov tshwj xeeb peb yuav tsum siv NPN thiab PNP sensors tib lub sijhawm, thiab qhov no yog qhov peb yuav tsum ua li cas? Txoj kev yooj yim tshaj plaws yog siv qhov hloov pauv hloov pauv.
Tab sis txoj kev no muaj qee qhov tsis zoo, uas yog, qee cov teeb liab tsis tuaj yeem hloov pauv, xws li encoders, thiab lwm yam. Muaj kuj yog vim cov relay xav tau nqus lub sijhawm, uas yuav ua rau qee qhov qeeb hauv PLC scanning input signals, uas yog. tsis tso cai rau ib qho xwm txheej.
Yog li, kuv xav kom koj siv txoj kev thib ob, uas yog, PLC siv lub davhlau ya nyob twg sib txawv, rau Siemens S7 series PLC, txhua PLCs muaj cov haujlwm ntawm kev nthuav dav, thiab txhua qhov module muaj qhov sib txawv dav dav, yog li koj tuaj yeem nthuav dav dav dav dav ntawm lub module rau hauv hom xav tau, kom paub txog kev ua haujlwm ntawm kev lees txais NPN thiab PNP sensors tib lub sijhawm.