Yaya Nisa Za'a Iya Yaduwar Siginar 4-20mA?

Yaya Nisa Za'a Iya Yaduwar Siginar 4-20mA?

Wannan ba shi da sauƙi don ba da amsar tambayar, idan an yi watsi da sauran abubuwan da ke tasiri duk sauran abubuwan, za mu iya ƙididdigewa

Don yanayin al'ada, yana iya tafiya kusan 200-500m.Bari mu san wasu mahimman bayanai game da 4-20mA.

1. Menene Siginar 4-20mA?

Siginar 4-20mA ita ce madaidaicin yarjejeniya da ake amfani da ita a masana'antu da yawa.Hanya ce ta isar da bayanan siginar analog a cikin madauki na yanzu mai waya biyu, yana samar da ingantaccen hanyar sadarwa tsakanin na'urori.Ma'auni daga 4-20mA yawanci suna wakiltar 0 zuwa 100% na kewayon aunawa.

2. Amfanin 4-20mA Sigina

Me yasa masana'antu suka fi son amfani da siginar 4-20mA?Na ɗaya, ba su da sauƙi ga hayaniya idan aka kwatanta da siginar wutar lantarki.Wannan yana ba da damar watsawa ta nisa mai tsayi ba tare da lalata amincin sigina ba.Bugu da ƙari, "sifilin rayuwa" a 4mA yana ba da damar gano kuskure.

3. Ta yaya ake watsa siginar 4-20mA?

Ana watsa siginar 4-20mA ta hanyar madauki na yau da kullun mai waya biyu inda waya ɗaya shine ƙarfin samar da wutar lantarki ɗayan kuma shine hanyar dawowa zuwa tushen.Bambancin halin yanzu a cikin madauki yana wakiltar bayanan siginar.

4. Amma akwai wasu dalilai da ya kamata ku yi la'akari:

Abun da ke shiga tsakani:

①Excitation Voltage;

②Ƙarƙashin Ƙarƙashin Ƙarƙashin Ƙarƙashin Ƙarƙashin Ƙarƙashin Ƙarƙashin Ƙarƙashin Ƙarƙashin Ƙarƙashin Ƙarƙashin Ƙarƙashin Ƙarƙashin Ƙarƙashin Ƙarfafawa;

③Girman resistor mai ɗaukar wutar lantarki da na'urar allo ke amfani da ita don tattara halin yanzu;

④Girman juriya na waya.

Yana iya sauƙin ƙididdige nisan watsa ka'idar na siginar yanzu na 4-20mA.

Ta hanyar waɗannan adadi guda huɗu masu alaƙa.Daga cikin su, Uo shine samar da wutar lantarki na mai watsawa,

kuma dole ne a tabbatar da cewa Uo ≥ Umin a cikakken kaya (na yanzu I=20mA).Wato: Amfani-I.(RL+2r)≥ Umin.

Yawancin lokaci yana buƙatar auna nau'ikan nau'ikan nau'ikan da ba na lantarki ba kamar zazzabi, matsa lamba,

kudi, kwana da sauransu a masana'antu.Dukkansu suna buƙatar a canza su zuwa analoglantarki

sigina wanda ke canjawa zuwa na'ura mai sarrafawa ko nuni da 'yan mitoci kaɗan nesa.Wannan na'urar tana canzawa

adadin jiki cikin siginar lantarki mai suna transmitter.Ana isar da adadin analog ta hanyar

4-20 mA halin yanzu shine mafi yawan hanyar da aka fi sani da masana'antu.Ɗayan dalili don ɗaukar siginar yanzu

shi ne cewa ba shi da sauƙi don tsoma baki tare da rashin iyaka na ciki na tushen yanzu.

Juriya na waya a cikin jerin a cikin madauki ba ya shafar daidaito, kuma yana iya watsa daruruwan

na mita a kan talakawa Twisted biyu.

4-20mAana magana da min halin yanzu a matsayin 4mA, kuma max na yanzu shine 20mA.Dangane da buƙatun tabbatar da fashewa,

iyakance shine 20mA.Yawancin makamashin walƙiya na iya kunna iskar gas mai ƙonewa da fashewa, don haka ƙarfin 20mA ya fi dacewa.

Gano wayoyi masu karya, kuma mafi ƙarancin ƙimar shine 4mA maimakon 0mA.Lokacin da kebul na watsawa ya karye saboda kuskure.

madauki na yanzu yana raguwa zuwa 0. Yawancin lokaci muna ɗaukar 2mA azaman ƙimar ƙararrawa ta cire haɗin.Wani dalili shi ne cewa 4-20mA yana amfani da a

tsarin waya biyu.Wato, wayoyi biyu sune sigina da kuma wutar lantarki a lokaci guda, kuma ana amfani da 4mA don samar da tsayayyen aiki na da'ira zuwa firikwensin.

Yaya Nisa Za'a Iya Yaduwar Siginar 4-20mA?

Abun da ke shiga tsakani:
① Dangantaka da ƙarfin ƙarfin kuzari;

② Danganta da ƙaramin ƙarfin aiki wanda mai watsawa ya yarda;

③ Dangantaka da girman resistor mai ɗaukar wutar lantarki da na'urar allo ke amfani da ita don tattara halin yanzu;

④ Yana da alaƙa da girman juriyar waya.

Yana iya sauƙin ƙididdige nisan watsa ka'idar na siginar yanzu na 4-20mA.

Ta hanyar waɗannan adadi guda huɗu masu alaƙa.Daga cikin su, Uo shine samar da wutar lantarki na mai watsawa,

kuma dole ne a tabbatar da cewa Uo≥Umin yana da cikakken kaya (I=20mA na yanzu).Wato: Amfani-I.(RL+2r)≥Umin.

Bisa ga wannan dabarar, ana iya ƙididdige yawan juriya na waya lokacin da mai watsawa ya kasance a ƙananan ƙarfin aiki.

Hasashe: sananne: Ue = 24V, I = 20mA, RL = 250Ω, Umin = 12V. Nemo matsakaicin darajar r kamar 175Ω:

Sannan, bisa ga tsarin lissafin juriya na waya:

Tsakanin su:
ρ——Resistivity (Resistivity Bronze = 0.017, Aluminum resistivity=0.029)
L——Tsawon kebul (Naúrar: M)
S——Layin giciye (Raka'a: millimita murabba'i)
Lura: Ƙimar juriya tana daidai da tsayi kuma daidai da madaidaicin yanki na yanki.

Da tsayi da waya, mafi girma juriya;da kauri da waya, da ƙananan juriya.

Dauki jan karfe waya a matsayin misali, ρ= 0.017 Ω·mm2/m, wato: juriyar waya ta tagulla.

tare da yanki na giciye na 1mm2 kuma tsayin 1m shine 0.017Ω.Sai waya tsawon

175Ω daidai da 1mm2 shine 175/0.017=10294 (m).A ka'idar, 4-20mA watsa siginar

zai iya kaiwa dubun duban mita (dangane da dalilai kamar zumudi daban-daban

ƙarfin lantarki da mafi ƙarancin ƙarfin aiki na mai watsawa).

HENGKO yana da fiye da shekaru 10 na OEM / ODM musamman gwaninta da ƙwararru

ƙirar haɗin gwiwa / taimakon ƙira iyawar.Mun samar da 4-20mA da RS485 fitarwa

gas firikwensin / ƙararrawa / module / abubuwa.4-20mA da RS485 zafin fitarwa da zafi

Hakanan ana samun firikwensin / watsawa / bincike.HENGKO an tsara shi musamman don abokan ciniki

saduwa da buƙatun ma'aunin ma'auni na hanyoyin masana'antu da sarrafa muhalli.

Me yasa ake amfani da 4 zuwa 20ma don watsa sigina a cikin Kayan aiki?

Kuna iya duba kamar yadda bidiyon ke biyo baya don sanin cikakkun bayanai.

Kammalawa

Siginar 4-20mA shine ma'aunin masana'antu don dalili.Ikon watsa shi a cikin dogon nesa ba tare da asarar daidaito ba shine babban fa'ida.Duk da yake babu tabbataccen amsa ga "har zuwa yanzu" saboda ya dogara da dalilai kamar juriya na waya, hayaniyar sigina, samar da wutar lantarki, da juriya, tare da matakan da suka dace a wurin, yana iya dogaro da cika nisa mai yawa.Ta hanyar aikace-aikacen sa mai amfani a cikin masana'antu da fasahar firikwensin, muna ganin ƙima da mahimmancin siginar 4-20mA a cikin duniyar haɗin gwiwa.

FAQs

1. Menene mahimmancin "sifilin rayuwa" a 4mA a cikin siginar 4-20mA?

"Zero mai rai" a 4mA yana ba da damar gano kuskure.Idan sigina ya faɗi ƙasa da 4mA, yana nuna kuskure, kamar karyewar madauki ko gazawar na'urar.

2. Me yasa siginar 4-20mA ba ta da sauƙi ga amo?

Canje-canjen juriya da hayaniyar lantarki ba su da tasiri a sigina na yanzu.Wannan shine dalilin da ya sa aka fi son su don watsa nisa mai nisa da kuma a cikin yanayin hayaniya na lantarki.

3. Wace rawa juriya ke takawa wajen watsa siginar 4-20mA?

Ya kamata juriya na lodi ya dace da wutar lantarki.Idan juriyar lodi ya yi tsayi da yawa, mai yiwuwa wutar lantarki ba za ta iya fitar da madauki na yanzu ba, yana iyakance nisan watsawa.

4. Shin za a iya watsa siginar 4-20mA ba tare da waya ba?

Ee, tare da yin amfani da masu watsawa da masu karɓa waɗanda aka tsara musamman don wannan dalili, ana iya watsa siginar 4-20mA ba tare da waya ba.

5. Shin zai yiwu a tsawaita nisan watsawa na siginar 4-20mA?

Ee, ta hanyar amfani da wayoyi masu dacewa, rage amo, tabbatar da isassun wutar lantarki, da daidaita juriya, za a iya tsawaita nisan watsawa.

Idan kuna sha'awar yuwuwar siginar 4-20mA kuma kuna son aiwatarwa ko haɓaka irin waɗannan tsarin a cikin masana'antar ku,

kar a yi jinkiri don ɗaukar mataki na gaba.Don ƙarin bayani, tallafi, ko shawarwari, tuntuɓi masana.

Tuntuɓi HENGKO yanzu aka@hengko.comkuma bari mu cimma mafi kyawun nisa watsa tare.