Iyini imiphumela engu-4-20mA?
1.) Isingeniso
I-4-20mA (milliamp) uhlobo lwamandla kagesi oluvame ukusetshenziswa ekudluliseni izimpawu ze-analog ezinhlelweni zokulawula izinqubo zezimboni kanye nezinhlelo zokuzenzakalela. Luyi-loop yamandla kagesi ezisebenzisa yona, ene-voltage ephansi engadlulisa izimpawu emabangeni amade nasezindaweni ezinomsindo kagesi ngaphandle kokulimaza kakhulu isignali.
Ububanzi obungu-4-20mA bumele ububanzi obungama-milliamp angu-16, kanye nama-milliamp amane amele inani eliphansi noma eliyi-zero lesignali kanye nama-milliamp angu-20 amele inani eliphezulu noma eligcwele lesignali. Inani langempela lesignali ye-analog edluliswayo libhalwe njengesikhundla ngaphakathi kwalolu bubanzi, kanti izinga lamanje lilingana nenani lesignali.
Ukukhishwa okungu-4-20mA kuvame ukusetshenziselwa ukudlulisa izimpawu ze-analog ezivela kuma-sensor nakwamanye amadivayisi asensimini, njenge-temperature probes kanye nama-pressure transducers, ukulawula nokuqapha izinhlelo. Kuphinde kusetshenziswe ukudlulisa izimpawu phakathi kwezingxenye ezahlukene ngaphakathi kwesistimu yokulawula, njengokusuka ku-programmable logic controller (PLC) kuya ku-valve actuator.
Ekwenzeni okuzenzakalelayo kwezimboni, okukhiphayo okungu-4-20mA kuyisignali esetshenziswa kakhulu ekudluliseni ulwazi oluvela kuma-sensor nakwamanye amadivayisi. Okukhiphayo okungu-4-20mA, okwaziwa nangokuthi i-current loop, kuyindlela eqinile nethembekile yokudlulisa idatha emabangeni amade, ngisho nasezindaweni ezinomsindo. Lokhu okuthunyelwe kwebhulogi kuzohlola izisekelo zokukhipha okungu-4-20mA, okuhlanganisa ukuthi kusebenza kanjani kanye nezinzuzo kanye nokungalungi kokukusebenzisa ezinhlelweni zokuzenzakalelayo kwezimboni.
Ukukhishwa okungu-4-20mA kuyisignali ye-analog edluliselwa kusetshenziswa ugesi ongaguquki ongu-4-20 milliamps (mA). Kuvame ukusetshenziselwa ukudlulisa ulwazi mayelana nokulinganiswa kobuningi obubonakalayo, njengokucindezela, izinga lokushisa, noma izinga lokugeleza. Isibonelo, inzwa yokushisa ingadlulisela isignali engu-4-20mA ngokulingana nokushisa ekulinganisayo.
Enye yezinzuzo eziyinhloko zokusebenzisa umkhiqizo ongu-4-20mA ukuthi uyindinganiso evamile ezenzakalelayo zezimboni. Kusho ukuthi izinhlobo eziningi zamadivayisi, njengezinzwa, izilawuli, kanye nama-actuator, zenzelwe ukuhambisana nezimpawu ezingu-4-20mA. Kwenza ukuhlanganisa amadivayisi amasha ohlelweni olukhona kube lula, inqobo nje uma esekela umkhiqizo ongu-4-20mA.
2.）Isebenza kanjani imiphumela engu-4-20mA?
Ukukhishwa okungu-4-20mA kudluliswa kusetshenziswa iluphu yamanje, equkethe umthumeli kanye nomemukeli. Umthumeli, ngokuvamile inzwa noma enye idivayisi elinganisa inani elibonakalayo, ukhiqiza isignali engu-4-20mA bese eyithumela kumamukeli. Umamukeli, ngokuvamile umlawuli noma enye idivayisi enesibopho sokucubungula isignali, uthola isignali engu-4-20mA futhi achaze ulwazi oluqukethwe yiyo.
Ukuze isignali engu-4-20mA idluliselwe ngokunembile, kubalulekile ukugcina ugesi oqhubekayo ngeluphu. Lokhu kufezwa ngokusebenzisa i-resistor ekhawulela ugesi ku-transmitter, ekhawulela inani logesi elingageleza ngesekethe. Ukumelana kwe-resistor ekhawulela ugesi kukhethwa ukuvumela ububanzi obufunwayo buka-4-20mA ukuthi bugeleze ngeluphu.
Enye yezinzuzo ezibalulekile zokusebenzisa iluphu yamanje ukuthi ivumela isignali engu-4-20mA ukuthi idluliselwe amabanga amade ngaphandle kokuhlushwa ukuwohloka kwesignali. Kungenxa yokuthi isignali idluliselwa njengomsinga kunokuba ibe yi-voltage, okungathinteki kalula ekuphazamisekeni nomsindo. Ngaphezu kwalokho, amaluphu amanje angadlulisela isignali engu-4-20mA phezu kwama-pair asontekile noma izintambo ze-coaxial, okunciphisa ingozi yokuwohloka kwesignali.
3.） Izinzuzo zokusebenzisa okukhipha okungu-4-20mA
Kunezinzuzo eziningana zokusebenzisa umkhiqizo ongu-4-20mA ezinhlelweni zokwenza izinto ngokuzenzakalela kwezimboni. Ezinye zezinzuzo ezibalulekile zifaka:
Ukudluliswa kwesignali yebanga elide:Umphumela ongu-4-20mA ungadlulisa amasignali amabanga amade ngaphandle kokulahlekelwa yisignali. Ilungele ukusetshenziswa ezinhlelweni lapho umthumeli kanye nomemukeli kuqhelelene kakhulu, njengasezimbonini ezinkulu zezimboni noma ezindaweni zokugaya uwoyela zasogwini.
A: Ukungavikeleki komsindo ophezulu:Ama-current loops amelana kakhulu nomsindo kanye nokuphazamiseka, okwenza kube kuhle kakhulu ukusetshenziswa ezindaweni ezinomsindo. Kubaluleke kakhulu ezindaweni zezimboni, lapho umsindo kagesi ovela ezinjinini kanye neminye imishini ungabangela izinkinga ngokudluliswa kwesignali.
B: Ukuhambisana namadivayisi ahlukahlukene:Njengoba ukuphuma kwe-4-20mA kuyindinganiso evamile ezenzakalelayo zezimboni, kuyahambisana namadivayisi amaningi. Kwenza ukuhlanganisa amadivayisi amasha ohlelweni olukhona kube lula, inqobo nje uma esekela ukuphuma kwe-4-20mA.
4.) Okubi kokusebenzisa umphumela ongu-4-20mA
Nakuba umkhiqizo ongu-4-20mA unezinzuzo eziningi, kukhona futhi nezinkinga zokuwusebenzisa ezinhlelweni zokwenza izinto ngokuzenzakalela kwezimboni. Lokhu kufaka phakathi:
A: Isixazululo esilinganiselwe:Ukukhishwa okungu-4-20mA kuyisignali ye-analog edluliselwa kusetshenziswa ububanzi obuqhubekayo bamanani. Kodwa-ke, isinqumo sesignali sinqunyelwe ububanzi obungu-4-20mA, obungu-16mA kuphela. Lokhu kungase kunganeli izinhlelo zokusebenza ezidinga izinga eliphezulu lokunemba noma ukuzwela.
B: Ukuthembela ekuhlinzekweni kwamandla:Ukuze isignali engu-4-20mA idluliselwe ngokunembile, kubalulekile ukugcina ugesi oqhubekayo nge-loop. Lokhu kudinga ukunikezwa kwamandla, okungaba yizindleko ezengeziwe kanye nobunzima ohlelweni. Ngaphezu kwalokho, ukunikezwa kwamandla kungase kuhluleke noma kuphazamiseke, okungathinta ukudluliselwa kwesignali engu-4-20mA.
5.) Isiphetho
Ukukhishwa okungu-4-20mA uhlobo lwesignali olusetshenziswa kabanzi ezinhlelweni zokuzenzakalela zezimboni. Kudluliselwa kusetshenziswa ugesi ongaguquki ongu-4-20mA futhi kwamukelwa kusetshenziswa iluphu yamanje equkethe i-transmitter kanye ne-receiver. Ukukhishwa okungu-4-20mA kunezinzuzo eziningana, kufaka phakathi ukudluliselwa kwesignali yebanga elide, ukungavikeleki komsindo ophezulu, kanye nokuhambisana namadivayisi ahlukahlukene. Kodwa-ke, futhi kunezinkinga ezithile, kufaka phakathi ukuxazulula okulinganiselwe kanye nokuncika ekunikezelweni kwamandla. Sekukonke, ukukhishwa okungu-4-20mA kuyindlela ethembekile neqinile yokudlulisa idatha ezinhlelweni zokuzenzakalela zezimboni.
Uyini Umehluko Phakathi Kokukhipha kwe-4-20ma, 0-10v, 0-5v, kanye ne-I2C?
I-4-20mA, i-0-10V, kanye ne-0-5V zonke ziyizimpawu ze-analog ezivame ukusetshenziswa ezenzakalelayo zezimboni nakwezinye izinhlelo zokusebenza. Zisetshenziselwa ukudlulisa ulwazi mayelana nokulinganiswa kwenani elibonakalayo, njengokucindezela, izinga lokushisa, noma izinga lokugeleza.
Umehluko omkhulu phakathi kwalezi zinhlobo zezibonakaliso ububanzi bamanani ezingawadlulisela. Izibonakaliso ezingu-4-20mA zidluliselwa kusetshenziswa ugesi ongaguquki wama-milliamp angu-4-20, izimpawu ezingu-0-10V zidluliselwa kusetshenziswa i-voltage esukela ku-0 kuya ku-10 volts, kanti izimpawu ezingu-0-5V zidluliselwa kusetshenziswa i-voltage esukela ku-0 kuya ku-5 volts.
I-I2C (Inter-Integrated Circuit) iyiphrothokholi yokuxhumana yedijithali esetshenziselwa ukudlulisa idatha phakathi kwamadivayisi. Ivame ukusetshenziswa ezinhlelweni ezifakiwe nakwezinye izinhlelo zokusebenza lapho amadivayisi amaningi edinga ukuxhumana khona. Ngokungafani nezimpawu ze-analog, ezidlulisela ulwazi njengobubanzi obuqhubekayo bamanani, i-I2C isebenzisa uchungechunge lwama-pulse edijithali ukudlulisa idatha.
Uhlobo ngalunye lwalezi zimpawu lunezinzuzo nezinkinga zalo, futhi ukukhetha okungcono kuzoncika ezidingweni ezithile zohlelo lokusebenza. Isibonelo, izimpawu ze-4-20mA zivame ukuthandwa ekudlulisweni kwesignali yebanga elide kanye nokungavikeleki komsindo ophezulu, kuyilapho izimpawu ze-0-10V kanye ne-0-5V zingase zinikeze ukucaca okuphezulu kanye nokunemba okungcono. I-I2C ngokuvamile isetshenziselwa ukuxhumana kwebanga elifushane phakathi kwenani elincane lamadivayisi.
1. Ububanzi bamanani:Izimpawu ze-4-20mA zidlulisa ugesi osukela kuma-milliamp angu-4 kuya kwangu-20, izimpawu ze-0-10V zidlulisa ugesi osukela kuma-volt angu-0 kuya kwangu-10, kanti izimpawu ze-0-5V zidlulisa ugesi osukela kuma-volt angu-0 kuya kwangu-5. I-I2C iyiphrothokholi yokuxhumana yedijithali futhi ayidlulisi amanani aqhubekayo.
2. Ukudluliswa kwesignali:Izimpawu ze-4-20mA kanye ne-0-10V zidluliselwa kusetshenziswa iluphu yamanje noma i-voltage, ngokulandelana. Izimpawu ze-0-5V nazo zidluliselwa kusetshenziswa i-voltage. I-I2C idluliselwa kusetshenziswa uchungechunge lwama-pulse edijithali.
3. Ukuhambisana:Izimpawu ze-4-20mA, 0-10V, kanye ne-0-5V zivame ukuhambisana namadivayisi amaningi, njengoba zisetshenziswa kabanzi ezenzakalelayo zezimboni nakwezinye izinhlelo zokusebenza. I-I2C isetshenziswa kakhulu ezinhlelweni ezifakiwe nakwezinye izinhlelo zokusebenza lapho amadivayisi amaningi edinga ukuxhumana khona.
4. Isixazululo:Izimpawu ze-4-20mA zinesinqumo esilinganiselwe ngenxa yobubanzi obulinganiselwe bamanani ezingawadlulisela (i-16mA kuphela). Izimpawu ze-0-10V kanye ne-0-5V zinganikeza isinqumo esiphezulu kanye nokunemba okungcono, kuye ngezidingo ezithile zohlelo lokusebenza. I-I2C iyiphrothokholi yedijithali futhi ayinaso isinqumo ngendlela efanayo nezimpawu ze-analog.
5. Ukuzivikela komsindo:Amasignali angu-4-20mA amelana kakhulu nomsindo kanye nokuphazamiseka ngenxa yokusebenzisa iluphu yamanje yokudlulisa isignali. Amasignali angu-0-10V kanye no-0-5V angase abe sengozini enkulu yomsindo, kuye ngokuthi kusetshenziswe kanjani okuthile. I-I2C ngokuvamile imelana nomsindo njengoba isebenzisa ama-pulse edijithali yokudlulisa isignali.
Yisiphi esisetshenziswa kakhulu?
Yikuphi okukhethwa kukho okungcono kakhulu kokukhipha ukushisa nomswakama?
Kunzima ukusho ukuthi iyiphi inketho yokukhipha esetshenziswa kakhulu kuma-transmitter okushisa nomswakama, njengoba kuncike ekusetshenzisweni okukhethekile kwesistimu kanye nezidingo zayo. Kodwa-ke, i-4-20mA kanye ne-0-10V zisetshenziswa kabanzi ekudluliseni izilinganiso zokushisa nomswakama ezenzakalelayo zezimboni nakwezinye izinhlelo zokusebenza.
I-4-20mA iyindlela ethandwayo yokudlulisa izinga lokushisa kanye nomswakama ngenxa yokuqina kwayo kanye namakhono okudlulisa ibanga elide. Iphinde imelane nomsindo kanye nokuphazamiseka, okwenza ifaneleke ukusetshenziswa ezindaweni ezinomsindo.
I-0-10V ingenye indlela esetshenziswa kabanzi kuma-transmitter okushisa nomswakama. Inikeza ukucaca okuphezulu nokunemba okungcono kune-4-20mA, okungaba kubalulekile ezinhlelweni zokusebenza ezidinga ukunemba okuphezulu.
Ekugcineni, inketho engcono kakhulu yokukhipha i-transmitter yokushisa nomswakama izoncika ezidingweni ezithile zohlelo lokusebenza. Izici zebanga phakathi kwe-transmitter ne-receiver, izinga lokunemba kanye nesisombululo esidingekayo, kanye nendawo yokusebenza (isb., ukuba khona komsindo kanye nokuphazamiseka).
Iyini Ukusetshenziswa Okuyinhloko Kokuphuma kwe-4-20mA?
Ukukhishwa okungu-4-20mA kusetshenziswa kabanzi ezenzakalelayo zezimboni nakwezinye izinhlelo zokusebenza ngenxa yokuqina kwayo kanye namakhono okudlulisa ibanga elide. Ezinye izinhlelo zokusebenza ezivamile zokukhishwa okungu-4-20mA zifaka:
1. Ukulawulwa Kwenqubo:I-4-20mA ivame ukusetshenziselwa ukudlulisa iziguquguquko zenqubo, njengokushisa, ingcindezi, kanye nesivinini sokugeleza, kusukela kuzinzwa kuya kubalawuli ezinhlelweni zokulawula izinqubo.
2. Ukwenziwa Kwezinsimbi Zezimboni:I-4-20mA ivame ukusetshenziswa ukudlulisa idatha yokulinganisa kusuka kumathuluzi ezimboni, njengemitha yokugeleza kanye nezinzwa zamazinga, kubalawuli noma izibonisi.
3. Ukwakha Okuzenzakalelayo:I-4-20mA isetshenziswa ekwakheni izinhlelo zokwenza izinto ngokuzenzakalela ukuze kudluliselwe ulwazi mayelana nokushisa, umswakama, kanye nezinye izimo zemvelo kusuka kuzinzwa kuya kubalawuli.
4. Ukukhiqizwa Kwamandla:I-4-20mA isetshenziswa ezitshalweni zokuphehla ugesi ukudlulisa idatha yokulinganisa kusuka kuzinzwa nezinsimbi kuya kubalawuli kanye nezibonisi.
5. Uwoyela negesi:I-4-20mA ivame ukusetshenziswa embonini kawoyela negesi ukudlulisa idatha yokulinganisa kusuka kuzinzwa nezinsimbi ezisekelweni nasemapayipini asogwini.
6. Ukwelashwa Kwamanzi Nokungcola:I-4-20mA isetshenziswa ezitshalweni zokuhlanza amanzi namanzi angcolile ukudlulisa idatha yokulinganisa kusuka kuzinzwa nezinsimbi kuya kubalawuli kanye nezibonisi.
7. Ukudla Neziphuzo:I-4-20mA isetshenziswa embonini yokudla neziphuzo ukudlulisa idatha yokulinganisa kusuka kuzinzwa nezinsimbi kuya kubalawuli kanye nezibonisi.
8. Izimoto:I-4-20mA isetshenziswa embonini yezimoto ukudlulisa idatha yokulinganisa kusuka kuzinzwa nezinsimbi kuya kubalawuli nezibonisi.
Unentshisekelo yokufunda kabanzi ngesithumeli sethu sokushisa nomswakama esingu-4-20? Xhumana nathi nge-imeyili.ka@hengko.comukuze uthole yonke imibuzo yakho iphenduleke futhi uthole ulwazi olwengeziwe mayelana nomkhiqizo wethu. Silapha ukuzokusiza ukuthi wenze isinqumo esingcono kakhulu sezidingo zakho. Unganqikazi ukuxhumana nathi - silangazelela ukuzwa kuwe!
Isikhathi sokuthunyelwe: Jan-04-2023
