Inzwa yoxinzelelo 89448-34020 yeengxenye zemoto yeToyota

1. Unxibelelwano olukude

Okwangoku (4 ukuya kwi-20 mA) yi-interface ye-analog ekhethiweyo xa uhambisa ulwazi kumgama omde.Oku kungenxa yokuba ukuphuma kwamandla ombane kuchaphazeleka ngakumbi kukuphazamiseka kwengxolo, kwaye umqondiso ngokwawo uya kuthotywa kukuxhathisa kwentambo.Nangona kunjalo, umphumo wangoku unokumelana nemigama emide kwaye unikeze ukufundwa koxinzelelo olupheleleyo noluchanekileyo ukusuka kumthumeli ukuya kwinkqubo yokufumana idatha.

2. Ukomelela kuphazamiseko lweRF

Iintambo zentambo zisesichengeni sombane we-electromagnetic (EMI)/ifrikhwensi yerediyo (RFI)/i-electrostatic (ESD) uphazamiseko kwiintambo ezikufutshane neentambo.Le ngxolo yombane ingafunekiyo iya kubangela umonakalo omkhulu kwimiqondiso ephezulu ye-impedance efana neempawu zombane.Le ngxaki inokunqotshwa ngokulula ngokusebenzisa i-impedance ephantsi kunye neempawu eziphezulu zangoku, ezifana ne-4-20 mA.

3, ukulungisa ingxaki

Umqondiso we-4-20 mA unemveliso ye-4 mA kwaye ixabiso loxinzelelo liyi-zero.Oku kuthetha ukuba isiginali ine "zero ephilayo", ke nokuba uxinzelelo luyi-zero, luya kusebenzisa i-4 mA yangoku.Ukuba isignali yehla kwi-0 mA, lo msebenzi unokubonelela ngomsebenzisi ngesibonakaliso esicacileyo sephutha lokufunda okanye ukulahleka komqondiso.Oku akunakufezekiswa kwimeko yeempawu zombane, ezihlala zivela kwi-0-5 V okanye i-0-10 V, apho i-0 V ephumayo ibonisa uxinzelelo lwe-zero.

4. Ukwahlulwa komqondiso

Isignali ye-4-20 mA yemveliso yisignali ephantsi ye-impedance yangoku, kwaye ukugxilwa phantsi kuzo zombini iziphelo (ukuhambisa kunye nokwamkela) kunokukhokelela kwi-loop yomhlaba, okubangela umqondiso ochanekileyo.Ukuze ugweme oku, umgca ngamnye we-4-20 mA kufuneka ube yedwa ngokufanelekileyo.Nangona kunjalo, xa kuthelekiswa nemveliso ye-0-10 V, oku kuyayithintela inzwa ukuba ifakwe kwi-daisy-chain kwisiseko sentambo enye.

5. Ukufumana ukuchaneka

Xa uthumela kwi-sensor yoxinzelelo, i-voltmeter inokutolika ngokulula i-0-10 V isignali ekupheleni kokufumana.Kwimveliso ye-4-20 mA, umqondiso unokufundwa kuphela emva kokuba ummkeli aguqulelwe kwi-voltage.Ukuze uguqule lo mqondiso kwi-voltage drop, i-resistor ixhunyiwe kwi-series kwi-terminal ephumayo.Ukuchaneka kwesi sichasi kubaluleke kakhulu kumlinganiselo wokuchaneka komqondiso ofunyenweyo.