Kev txiav txim siab yog tias kub khiav kev sib txuas lus digital cuam tshuam nrog yuav tsum muaj kev tshuaj xyuas dav dav ntawm peb yam: qhov tshwm sim txawv txav, teeb liab waveforms, thiab cov cav kaw lus. Qhov no yuav tsum tau ua ke nrog cov cuab yeej tshuaj ntsuam xyuas kom sai nrhiav qhov cuam tshuam. Cov hauv qab no yog ib txoj kev ntsuam xyuas systematic:
1. Saib xyuas cov xwm txheej txawv txav
Yog tias muaj xwm txheej hauv qab no tshwm sim, kev cuam tshuam yuav tshwm sim:
Kev sib txuas lus tsis ruaj khov: Kev sib txuas tsis tu ncua ntawm cov kev sib txuas thiab cov xwm txheej offline, tshwj xeeb tshaj yog thaum lub sijhawm pib inverter lossis lub rhaub rau / tawm mus.
Cov ntaub ntawv hloov pauv txawv txav: Cov kev hloov pauv tsis tu ncua hauv cov ntsuas kub ntsuas kub (piv txwv li, siab dua ± 10 degree), thiab pom pom qhov sib txawv hauv qhov siab lossis hloov pauv sensor.
Nce me ntsis yuam kev tus nqi: nquag "Checksum yuam kev" lossis "Timeout" yuam kev hauv Modbus kev sib txuas lus.
Kev tswj tsis ua haujlwm: Asynchronous valve koob txav thiab ncua qhib qhib ua rau tsis sib xws los yog nyem.
Kev Txiav Txim Ua Ntej: Yog tias qhov txawv txav yog synchronized nrog kev ua haujlwm ntawm cov khoom siv hluav taws xob siab -, electromagnetic cuam tshuam yog qhov muaj feem ntau.
2. Siv cov cuab yeej los kuaj xyuas cov teeb liab zoo
(1) Kev Ntsuas Oscilloscope (Txoj Kev Tseem Ceeb)
Ntsuas Point: Ntsuas qhov sib txawv ntawm RS-485 A / B kab ntawm kev sib txuas lus ntawm qhov ntsuas kub.
Hom cuam tshuam Waveforms:
Fais fab zaus cuam tshuam: Superimposed 50Hz sine yoj;
Pulse Suab nrov: Microsecond- theem spikes thiab glitches;
Siab -Frequency Oscillation: MHz-theem RF oscillations superimposed;
Teeb liab Reflection: Waveform hooks los yog ringing, qhia tias tsis muaj terminating resistors.
Nws raug nquahu kom siv qhov ntsuas qhov sib txawv kom tsis txhob muaj - hom voltage cuam tshuam qhov ntsuas qhov tseeb.
(2) Spectrum Analyzer / Ze ntawm -Kev Tshawb Fawb
Luam theej duab electromagnetic ib puag ncig ib puag ncig lub txee tswj thiab cables txhawm rau txheeb xyuas qhov chaw muaj hluav taws xob muaj zog (xws li hloov cov khoom siv hluav taws xob thiab cov khoom siv zaus).
Nrhiav qhov siab -ntau zaus lub suab nrov ntawm lub rooj tsavxwm PCB siv qhov ze ntawm - teb sojntsuam.
(3) Bus Analyzer
Khaws cov ntaub ntawv sib txuas lus thiab txheeb xyuas cov ntsuas xws li CRC yuam kev, suav rov qab, thiab cov lus teb qeeb.
Cov ntawv teev sijhawm tuaj yeem cuam tshuam los txiav txim seb qhov cuam tshuam puas cuam tshuam rau kev ua haujlwm ntawm cov cuab yeej tshwj xeeb. 3. Kho vajtse thiab Cabling Status Check
(1) Kev Tiv Thaiv Kev Tiv Thaiv thiab Grounding Check
Puas yog ob -shielded twisted-pair cable siv?
Puas yog txheej thaiv thaiv tsuas yog nyob ntawm ib qho taw tes ntawm PLC kawg? Grounding ntawm ob qhov kawg tuaj yeem yooj yim tsim lub voj hauv av.
Puas yog qhov kev tiv thaiv hauv av tsawg dua lossis sib npaug rau 4Ω? Tshawb xyuas siv lub grounding resistance tester.
(2) Cable Specification Check
Puas yog cov kab kev sib txuas lus thiab cov kab hluav taws xob tau muab tso rau hauv cov kab hluav taws xob sib cais nrog qhov sib nrug Ntau dua lossis sib npaug li 50cm?
Puas yog txoj kev hla mus rau ib leeg ntawm 90 degree?
Puas yog lawv khiav los ntawm cov kav dej hauv av? Yog tsis muaj conduits, tsis muaj kev tiv thaiv sab nraud.
(3) Termination Matching thiab Topology
Puas yog 120Ω terminating resistors ntsia ntawm ob qho kawg ntawm lub npav RS-485?
Puas yog topology daisy - chained? Zam lub hnub qub lossis tsob ntoo -zoo li ceg.
4. Txoj Kev Tshawb Fawb Txog Kev Tshawb Fawb (tej zaum muaj feem xyuam)
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Kev ua haujlwm |
Lub hom phiaj |
Xav Tau |
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Kev txo qis baud ib ntus (piv txwv li, 115200 → 19200) |
Txhim kho teeb liab - rau - suab nrov piv |
Kev sib txuas lus ruaj khov qhia tias tus nqi qub tsis haum rau ib puag ncig. |
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Tshem tawm cov txheej txheem tiv thaiv tej thaj chaw deb ntawm hauv av |
Tshem tawm hauv av loops |
Txo kev cuam tshuam qhia tau tias muaj ib qho teeb meem tshwm sim - hom. |
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Ntxiv ib qho ferrite core rau cov kab kev sib txuas lus |
Ncua siab - nrov nrov |
Txo glitches, kev sib txuas lus rov qab. |
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Tua cov khoom siv wireless ze ze |
Tshawb nrhiav RF cuam tshuam |
Kev sib txuas lus zoo dua qhia tias muaj RFI. |
Lub hom kev cuam tshuam ua ntej raug txheeb xyuas los ntawm waveform thiab log tsom, qhov tsawg dua nws yuav raug kuaj tsis raug raws li software txhaum lossis kho vajtse puas. Nws raug nquahu kom koom nrog kev sib txuas lus kev saib xyuas kev noj qab haus huv rau hauv kev tshuaj xyuas niaj hnub hloov los ntawm "kev daws teeb meem tsis zoo" mus rau "kev ceeb toom ntxov ntxov."
