Funda Lokhu Kwanele Ngalokho Okuphumayo okungu-4-20mA

Kuyini okukhiphayo kwe-4-20mA?

1.) Isingeniso

I-4-20mA (milliamp) iwuhlobo lwamanje kagesi oluvame ukusetshenziselwa ukudlulisa amasiginali e-analog ekulawuleni inqubo yezimboni kanye nezinhlelo ezizenzakalelayo. Iluphu yamanje ezisebenza yona, enevoltage ephansi ekwazi ukudlulisa amasignali ebangeni elide nasezindaweni ezinomsindo kagesi ngaphandle kokwehlisa isignali ngokuphawulekayo.

Ububanzi obungu-4-20mA bumele ubude obungamamilimitha angu-16, nama-milliamp amane amele inani elincane noma elinguziro lesignali kanye nama-milliamp angu-20 amele inani eliphezulu noma lesilinganiso esigcwele sesiginali. Inani langempela lesiginali ye-analogi edluliswayo ibhalwa ngekhodi njengendawo engaphakathi kwalobu bubanzi, ileveli yamanje ilingana nevelu yesiginali.

Okuphumayo kwe-4-20mA kuvame ukusetshenziselwa ukudlulisa amasiginali e-analog kusuka kuzinzwa nakwamanye amadivaysi asensimini, njengama-temperature probes nama-pressure transducers, ukulawula nokuqapha amasistimu. Iphinde isetshenziselwe ukudlulisa amasignali phakathi kwezingxenye ezahlukene ngaphakathi kwesistimu yokulawula, njengokusuka kusilawuli se-logicable logic (PLC) kuya ku-actuator ye-valve.

Ku-automation yezimboni, ukuphuma kwe-4-20mA kuyisignali evame ukusetshenziswa yokudlulisa ulwazi kusuka kuzinzwa namanye amadivaysi. I-4-20mA okukhiphayo, eyaziwa nangokuthi iluphu yamanje, iyindlela eqinile nethembekile yokudlulisa idatha ebangeni elide, ngisho nasezindaweni ezinomsindo. Lokhu okuthunyelwe kwebhulogi kuzohlola izisekelo zokuphuma kwe-4-20mA, okuhlanganisa ukuthi kusebenza kanjani kanye nezinzuzo kanye nobubi bokuyisebenzisa ezinhlelweni ezishintshayo zezimboni.

I-4-20mA okukhiphayo isignali ye-analog esakazwa kusetshenziswa amandla amanje angama-4-20 milliamp (mA). Ivamise ukusetshenziselwa ukudlulisa ulwazi mayelana nokukalwa kwenani elibonakalayo, elifana nokucindezela, izinga lokushisa, noma izinga lokugeleza. Isibonelo, inzwa yokushisa ingase idlulisele isignali engu-4-20mA ngokulingana nezinga lokushisa elilinganisayo.

Enye yezinzuzo ezinkulu zokusebenzisa ukuphuma kwe-4-20mA ukuthi iyindinganiso yendawo yonke ekuzishintsheni kwezimboni. Kusho ukuthi izinhlobonhlobo zamadivayisi, njengezinzwa, izilawuli, nama-actuator, aklanyelwe ukuhambisana namasignali angu-4-20mA. Kwenza ukuhlanganisa amadivayisi amasha ohlelweni olukhona kube lula, inqobo nje uma esekela okukhiphayo okungu-4-20mA.

2.) Ngabe okukhiphayo okungu-4-20mA kusebenza kanjani?

Okuphumayo okungu-4-20mA kudluliselwa kusetshenziswa iluphu yamanje, equkethe isidlulisi nomamukeli. I-transmitter, ngokuvamile inzwa noma enye idivayisi ekala inani elibonakalayo, ikhiqiza isignali engu-4-20mA futhi iyithumele kumamukeli. Umamukeli, ngokuvamile oyisilawuli noma enye idivayisi enesibopho sokucubungula isignali, ithola isignali engu-4-20mA futhi ihumusha ulwazi oluqukethe.

Ukuze isignali engu-4-20mA idluliselwe ngokunembile, kubalulekile ukugcina amandla angashintshi ngeluphu. Kufinyelelwa ngokusebenzisa i-resistor-limiting yamanje ku-transmitter, ekhawulela inani lamanje elingageleza kumjikelezo. Ukumelana ne-resistor ekhawulelayo yamanje kukhethwa ukuvumela uhla olufiswayo luka-4-20mA ukuthi lugeleze ku-loop.

Enye yezinzuzo ezibalulekile zokusebenzisa iluphu yamanje ukuthi ivumela isiginali ye-4-20mA ukuthi idluliselwe amabanga amade ngaphandle kokuhlushwa ukuwohloka kwesignali. Kungenxa yokuthi isignali idluliswa njengamanje esikhundleni se-voltage, engathinteki kakhulu ekuphazamisekeni nomsindo. Ngaphezu kwalokho, izihibe zamanje zingadlulisa isignali engu-4-20mA phezu kwamapheya asontekile noma izintambo ezingama-coaxial, kunciphise ubungozi bokuwohloka kwesignali.

3.） Izinzuzo zokusebenzisa okukhiphayo okungu-4-20mA

Kunezinzuzo ezimbalwa zokusebenzisa ukuphuma kwe-4-20mA ezinhlelweni ezishintshayo zezimboni. Ezinye zezinzuzo ezibalulekile zifaka:

Ukudluliswa kwesignali yebanga elide:Okuphumayo kwe-4-20mA kungadlulisela amasiginali kumabanga amade ngaphandle kokuhlupheka kokuwohloka kwesignali. Ilungele ukusetshenziswa ezinhlelweni lapho isidlulisi kanye nomamukeli kuqhelelene kakhulu, njengasezimbonini ezinkulu noma izinsimbi zikawoyela zasogwini lolwandle.

A: Ukungavikeleki komsindo ophezulu:Amaluphu amanje amelana kakhulu nomsindo nokuphazamiseka, okuwenza alungele ukusetshenziswa ezindaweni ezinomsindo. Kubaluleke kakhulu kuzilungiselelo zezimboni, lapho umsindo kagesi ovela kumamotho nezinye izinto zokusebenza ungabangela izinkinga ngokudluliswa kwesignali.

B: Ukuhambisana nezinhlobonhlobo zamadivayisi:Njengoba okukhiphayo okungu-4-20mA kuyindinganiso yendawo yonke ekuzishintsheni kwezimboni, kuyahambisana namadivayisi amaningi. Kwenza ukuhlanganisa amadivayisi amasha ohlelweni olukhona kube lula, inqobo nje uma esekela okukhiphayo okungu-4-20mA.

4.) Ububi bokusebenzisa okukhiphayo okungu-4-20mA

Ngenkathi ukuphuma kwe-4-20mA kunezinzuzo eziningi, kubuye kube nezingqinamba zokukusebenzisa ezinhlelweni ezishintshayo zezimboni. Lokhu kubandakanya:

A: Ukulungiswa okulinganiselwe:I-4-20mA okukhiphayo isignali ye-analog edluliselwa kusetshenziswa ububanzi obuqhubekayo bamanani. Kodwa-ke, ukulungiswa kwesignali kunqunyelwe ububanzi be-4-20mA, okuyi-16mA kuphela. Lokhu kungase kunganele ezinhlelweni zokusebenza ezidinga izinga eliphezulu lokunemba noma ukuzwela.

B: Ukuncika ekunikezeni amandla:Ukuze isignali engu-4-20mA idluliselwe ngokunembile, kubalulekile ukugcina amandla angashintshi ngeluphu. Lokhu kudinga ukunikezwa kwamandla kagesi, okungaba izindleko ezengeziwe nobunzima ohlelweni. Ngaphezu kwalokho, ukunikezwa kwamandla kungase kuhluleke noma kuphazamiseke, okungase kuthinte ukudluliswa kwesignali ye-4-20mA.

5.) Isiphetho

Okuphumayo kwe-4-20mA kuwuhlobo olusetshenziswa kakhulu lwesiginali ezinhlelweni ezishintshayo zezimboni. Idluliselwa kusetshenziswa i-current eqhubekayo ye-4-20mA futhi yamukelwe kusetshenziswa iluphu yamanje ehlanganisa isidluliseli nomamukeli. Okuphumayo kwe-4-20mA kunezinzuzo ezimbalwa, okuhlanganisa ukudluliswa kwesignali yebanga elide, ukungavikeleki komsindo ophezulu, nokuhambisana nezinhlobonhlobo zamadivayisi. Kodwa-ke, futhi inezihibe ezithile, okuhlanganisa ukulungiswa okulinganiselwe nokuncika ekunikezeni amandla. Sekukonke, okukhiphayo okungu-4-20mA kuyindlela ethembekile neqinile yokudlulisa idatha ezinhlelweni ezishintshayo zezimboni.

Uyini Umehluko Phakathi Kwe-4-20ma, 0-10v, 0-5v, kanye Ne-I2C Output?

I-4-20mA, 0-10V, kanye ne-0-5V wonke amasiginali e-analog avame ukusetshenziswa ekuzishintsheni kwezimboni nakwezinye izinhlelo zokusebenza. Asetshenziselwa ukudlulisa ulwazi mayelana nesilinganiso sobuningi obuphathekayo, njengokucindezela, izinga lokushisa, noma izinga lokugeleza.

Umehluko omkhulu phakathi kwalezi zinhlobo zamasignali ububanzi bamanani abangawadlulisela. Izimpawu ze-4-20mA zidluliselwa kusetshenziswa i-current eqhubekayo yama-milliamp angu-4-20, amasignali angu-0-10V adluliselwa kusetshenziswa i-voltage esukela ku-0 kuya ku-10 volts, futhi amasignali angu-0-5V adluliswa kusetshenziswa i-voltage esukela ku-0 kuya ku-5 volts.

I-I2C (I-Inter-Integrated Circuit) iyiphrothokholi yokuxhumana yedijithali esetshenziselwa ukudlulisa idatha phakathi kwamadivaysi. Ivamise ukusetshenziswa ezinhlelweni ezishumekiwe nakwezinye izinhlelo zokusebenza lapho amadivaysi amaningi edinga ukuxhumana wodwa. Ngokungafani namasignali e-analog, adlulisela ulwazi njengohlu oluqhubekayo lwamanani, i-I2C isebenzisa uchungechunge lwama-pulses edijithali ukudlulisa idatha.

Ngayinye yalezi zinhlobo zamasiginali inesethi yayo yezinzuzo kanye nokubi, futhi ukukhetha okungcono kakhulu kuzoncika ezidingweni ezithile zohlelo lokusebenza. Isibonelo, amasiginali we-4-20mA avame ukuncanyelwa ekudluliseleni isignali yebanga elide kanye nokuvikeleka komsindo ophezulu, kuyilapho amasiginali we-0-10V kanye ne-0-5V anganikeza ukulungiswa okuphezulu kanye nokunemba okungcono. I-I2C ngokuvamile isetshenziselwa ukuxhumana kwebanga elifushane phakathi kwenombolo encane yamadivayisi.

1. Ububanzi bamanani:Amasignali angu-4-20mA adlulisa i-current esukela ku-4 kuya ku-20 milliamp, amasignali angu-0-10V adlulisa i-voltage esukela ku-0 ukuya ku-10 volts, futhi amasignali angu-0-5V adlulisa i-voltage esukela ku-0 ukuya ku-5 volts. I-I2C iyiphrothokholi yokuxhumana yedijithali futhi ayidlulisi amanani aqhubekayo.

2. Ukudluliswa kwesignali:Izimpawu ze-4-20mA kanye ne-0-10V zithunyelwa kusetshenziswa iluphu yamanje noma i-voltage, ngokulandelana. Izimpawu ze-0-5V nazo zidluliselwa kusetshenziswa i-voltage. I-I2C isakazwa kusetshenziswa uchungechunge lwama-pulses edijithali.

3. Ukuhambisana:4-20mA, 0-10V, kanye namasiginali we-0-5V ngokuvamile ahambisana namadivayisi amaningi, njengoba asetshenziswa kakhulu kumishini ezenzakalelayo yezimboni nezinye izinhlelo zokusebenza. I-I2C isetshenziswa ngokuyinhloko ezinhlelweni ezishumekiwe nakwezinye izinhlelo zokusebenza lapho amadivaysi amaningi edinga ukuxhumana wodwa.

4. Isixazululo:Amasiginali we-4-20mA anokulungiswa okulinganiselwe ngenxa yebanga elilinganiselwe lamanani angakwazi ukuwadlulisela (i-16mA kuphela). Izimpawu ze-0-10V kanye ne-0-5V zinganikeza ukulungiswa okuphezulu nokunemba okungcono, kuye ngezidingo eziqondile zohlelo lokusebenza. I-I2C iyiphrothokholi yedijithali futhi ayinaso isixazululo ngendlela efanayo namasiginali e-analog enza ngayo.

5. Ukungavikeleki komsindo:Izimpawu ze-4-20mA zimelana kakhulu nomsindo nokuphazamiseka ngenxa yokusebenzisa iluphu yamanje yokudlulisa isignali. Amasignali angu-0-10V kanye ne-0-5V angase abe lula emsindweni, kuye ngokusetshenziswa okuthile. I-I2C ngokuvamile ayizwani nomsindo njengoba isebenzisa ama-pulses edijithali ukudlulisa isignali.

Iyiphi esetshenziswa kakhulu?

Iyiphi inketho engcono kakhulu yokukhipha isidlulisi sezinga lokushisa nomswakama?

Kunzima ukusho ukuthi iyiphi inketho yokukhipha esetshenziswa kakhulu kuma-transmitters okushisa nomswakama, njengoba kuncike ekusetshenzisweni okukhethekile kwesistimu kanye nezidingo. Kodwa-ke, i-4-20mA kanye ne-0-10V isetshenziswa kakhulu ekudluliseni izilinganiso zokushisa nomswakama kuma-automation wezimboni nezinye izinhlelo zokusebenza.

I-4-20mA iyindlela ethandwayo yokukhethwa kwamazinga okushisa kanye nomswakama ngenxa yokuqina kwayo namandla okudlulisa amabanga amade. Iphinde imelane nomsindo nokuphazamiseka, okuyenza ifanelekele ukusetshenziswa ezindaweni ezinomsindo.

I-0-10V ingenye inketho esetshenziswa kabanzi yokuhambisa izinga lokushisa nomswakama. Inikeza ukulungiswa okuphezulu nokunemba okungcono kuno-4-20mA, okungase kubaluleke ezinhlelweni ezidinga ukunemba okuphezulu.

Ekugcineni, inketho engcono kakhulu yokukhipha isidlulisi sezinga lokushisa nokuswakama izoncika ezidingweni ezithile zohlelo lokusebenza. Izici zebanga phakathi kwesidlulisi nesitholi, izinga lokunemba nokuxazulula okudingekayo, kanye nendawo yokusebenza (isb, ukuba khona komsindo nokuphazamiseka).

Iyini Ukusetshenziswa Okuyinhloko Kokukhiphayo kwe-4-20mA?

I-4-20mA ephumayo isetshenziswa kakhulu ekuzishintsheni kwezimboni nakwezinye izinhlelo zokusebenza ngenxa yokuqina kwayo namandla okudlulisa amabanga amade. Ezinye izinhlelo zokusebenza ezijwayelekile zokuphuma kwe-4-20mA zifaka:

1. Ukulawula Inqubo:I-4-20mA ivamise ukusetshenziselwa ukudlulisa okuguquguqukayo kwenqubo, okufana nezinga lokushisa, ingcindezi, nezinga lokugeleza, ukusuka kuzinzwa kuya kuzilawuli ezinhlelweni zokulawula inqubo.
2. Amathuluzi Embonini:I-4-20mA ivamise ukusetshenziselwa ukudlulisa idatha yokulinganisa isuka kumathuluzi emboni, njengamamitha okugeleza nezinzwa zeleveli, iye kuzilawuli noma izibonisi.
3. Ukwakha Okuzenzakalelayo:I-4-20mA isetshenziswa ekwakheni amasistimu ezishintshayo ukuze kudluliselwe ulwazi mayelana nezinga lokushisa, umswakama, nezinye izimo zemvelo kusuka kuzinzwa kuya kuzilawuli.
4. Ukukhiqiza Amandla:I-4-20mA isetshenziswa ezitshalweni eziphehla amandla ukuze kudluliselwe idatha yokulinganisa isuka kuzinzwa namathuluzi iye kuzilawuli nezibonisi.
5. Uwoyela Negesi:I-4-20mA ivamise ukusetshenziswa embonini kawoyela negesi ukuze kudluliselwe idatha yokulinganisa kusuka kuzinzwa namathuluzi kumapulatifomu namapayipi angasogwini.
6. Ukuhlanza Amanzi Namanzi Angcolile:I-4-20mA isetshenziswa ezindaweni zokuhlanza amanzi namanzi angcolile ukuze kudluliselwe idatha yokulinganisa isuka kuzinzwa namathuluzi iye kuzilawuli nezibonisi.
7. Ukudla Nesiphuzo:I-4-20mA isetshenziswa embonini yokudla neziphuzo ukudlulisa idatha yokulinganisa isuka kuzinzwa namathuluzi iye kuzilawuli nezibonisi.
8. Ezezimoto:I-4-20mA isetshenziswa embonini yezimoto ukudlulisa idatha yokulinganisa isuka kuzinzwa namathuluzi iye kuzilawuli nezibonisi.

Ingabe unentshisekelo yokufunda okwengeziwe ngezinga lokushisa elingu-4-20 kanye nesidlulisi somswakama? Xhumana nathi nge-imeyilika@hengko.comukuze uphendule yonke imibuzo yakho futhi uthole ulwazi olwengeziwe mayelana nomkhiqizo wethu. Silapha ukuze sikusize wenze isinqumo esingcono kakhulu sezidingo zakho. Ungangabazi ukuxhumana nathi - sibheke ngabomvu ukuzwa okuvela kuwe!