Tsev > Exhibition > Ntsiab lus

PLC piv nrog lwm lub tshuab

Mar 11, 2019

PLCs yog zoo yoog rau ib thaj tsam ntawm kev ua haujlwm automation. Cov no yog cov kev lag luam hauv kev lag luam uas cov nqi ntawm kev tsim thiab tswj cov automation system yog siab txheeb ze rau tus nqi tag nrho ntawm qhov kev siv nyiaj, thiab qhov twg hloov mus rau qhov system yuav raug cia siab thaum lub sijhawm ua haujlwm. PLCs muaj cov khoom siv tawm tswv yim thiab tso zis tshaj li cov kws tsav dav hlau thiab kev tswj; tsawg tsim hluav taws xob tsim yuav tsum tau, thiab qhov teeb meem tsim cov centres ntawm kev piav qhia yam ua tiav ntawm cov haujlwm. Kev siv PLC yog feem ntau lub peev xwm ua haujlwm, yog li tus nqi ntawm Paged Foos yog tsawg dua piv rau cov nqi ntawm ib qhov kev cai tsim ua tus qauv siv. Ntawm qhov tod tes, qhov khoom loj-tsim khoom, kev tswj kev tiv thaiv muaj kev ywj pheej. Qhov no yog vim tus nqi qis dua ntawm cov cheebtsam, uas yuav tsum xaiv yam tsis muaj kev sib txuas lus ntawm "generic", thiab qhov uas cov nqi uas tsis yog rov ua dua yuav kis tau ntau txhiab lossis ntau lab tus.


Rau siab ntim los yog yooj yim heev ruaj automation paub tab, ntau hom kev kawm raug siv. Piv txwv li, ib lub khw muag khoom noj pheej yig uas yuav tswj tau los ntawm kev siv lub tshuab thev naus laus zis costing tsuas yog ob peb duas las hauv qhov ntau lawm.


Ib tus qauv microcontroller tsim nyog tsim nyog uas tsim tau ntau pua pua lossis txhiab tus units yuav raug tsim thiab yog li tsim cov nqi (tsim cov khoom siv fais fab, khoom siv hluav taws xob tawm tswv yim / tso tawm, thiab kuaj thiab ntawv pov thawj) yuav kis tau ntau tshaj kev muag, thiab qhov kawg -user tsis tas yuav hloov qhov kev tswj hwm. Automotive daim ntawv thov yog ib qho piv txwv; tsheej lab ntawm cov koog tsev yog tsim txhua xyoo, thiab tsawg kawg-cov neeg siv hloov lub programming ntawm cov kev sib tshuam no. Txawm li cas los xij, qee cov tsheb tshwj xeeb xws li cov npav khiav tsheb npav siv PLCs tsis yog tsim los ntawm kev tswj tus kheej, vim tias qhov ntau tsawg tsawg thiab qhov kev tsim kho yuav tsis muaj nyiaj. [18]


Txoj kev tswj tus txheej txheem heev, xws li siv tshuaj hauv kev lag luam, yuav tsum tau algorithms thiab kev ua tau zoo tshaj qhov muaj peev xwm ntawm kev ua tau zoo tshaj plaws hauv cov PLCs. High-speed lossis precision ntawm kev tswj kuj yuav tsum tau kev daws teeb meem; piv txwv li, cov dav hlau dav dav dav dav hlau. Lub tshuab computer nkaus xwb uas yog siv cov khoom nruab nrab los sis kev kho hluav taws xob tshwj xeeb feem ntau yuav raug xaiv rau kev tswj cov kev xav tau uas cov kev txhim kho thiab kev them nqi kho siab. "Mos PLCs" khiav ntawm cov qauv duab uas muaj peev xwm sib txuas tau nrog cov I / O hardware thaum ua tiav cov kev zov me nyuam nyob rau hauv ib lub xov tooj ntawm cov lag luam kev lag luam uas tau siv rau kev tswj tus txheej txheem.


Cov programmable controllers yog siv rau hauv kev sib hais, qhov teebmeem, lossis kev tswj lub zog. Qee manufacturers tsim cov kev tswj kev tswj kom muaj kev koom nrog PLC kom G-code (uas yog siv lub tshuab CNC) siv los qhia kev taw qhia cov tshuab. [19] [qhov yuav tsum tau muaj]


PLCs kuj yuav muaj xws li logic rau cov tswv yim hloov ib qho txawv ntawm ib qho kev hloov analog, ib qho proportional, integral, derivative (PID) xws li. Ib lub voj PID siv tau los tswj lub ntsuas kub ntawm kev tsim khoom, piv txwv. Keeb kwm PLCs feem ntau yog teeb tsa nrog tsuas muaj ob peb qhov kev tswj kev tswj analog; qhov twg qhov kev xav tau yuav tsum tau pua pua lossis phav phav loops, yuav tsum siv qhov kev tswj fais fab (DCS). Raws li PLCs tau ua ntau dua, qhov ciam ntawm DCS thiab PLC daim ntawv thov tau qhov teeb meem.


PLCs zoo li kev ua haujlwm zoo li cov chaw hauv cov chaw taws teeb. Ib qho RTU, li cas los xij, feem ntau tsis txhawb kev tswj algorithms lossis tswj loops. Raws li kev kho mob sai sai tuaj yeem pheej yig thiab pheej yig dua, RTUs, PLCs, thiab DCSs pib nce sib luag ntawm cov luag haujlwm, thiab ntau cov neeg muag khoom muag RTUs nrog PLC zoo li nta, thiab vice versa. Txoj kev lag luam tau tsim los ntawm IEC 61131-3 cov lus ua haujlwm tsis zoo los tsim cov kev pabcuam khiav hauv RTUs thiab PLCs, txawm tias txhua tus neeg muag khoom tseem muaj lwm yam kev pabcuam thiab kev txhim kho thaj chaw.


Nyob rau hauv xyoo tas los "kev nyab xeeb" PLCs tau pib ua nrov, xws li ua qauv ua qauv los yog kev ua haujlwm thiab kev kho mob kom ruaj ntseg ntxiv rau cov qauv tswj kev lag luam (Allen-Bradley Guardlogix, Siemens F-series thiab lwm yam). Cov no txawv ntawm PLC hom qis raws li tsim nyog rau kev siv rau kev siv rau kev nyab xeeb-ib qho tseem ceeb rau cov PLCs tau txais kev lig kev cai nrog cov kev ruaj ntseg hauv kev ruaj ntseg. Piv txwv, kev siv PLC yuav siv los tswj kev nkag mus rau ib tug neeg hlau ntawm txoj kev nkag mus rau hauv tsev, lossis tswj xyuas qhov lus teb kaw rau qhov chaw nres tsheb thaum muaj xwm ceev rau ntawm ib qho kev tsim cov twj. Xws li PLCs feem ntau muaj kev txwv cov kev qhia uas tau teev tseg nrog cov lus qhia txog kev nyab xeeb uas tsim los rau kev sib txuas nrog cov chaw nres tsheb ceev, lub teeb ntxig, thiab lwm yam. Qhov yooj ywj siab hais tias cov kev pab cuam no tau ua rau kev loj hlob sai ntawm qhov kev thov rau cov kev sib tshuam no.