I. Kev Taw Qhia
Nrog rau kev nce qib sai ntawm kev lag luam automation thev naus laus zis, programmable logic controllers (PLCs) tau dhau los ua cov cuab yeej tseem ceeb hauv thaj teb, pom daim ntawv thov dav zuj zus. Fieldbus, uas yog ib qho tseem ceeb ntawm kev sib txuas lus thev naus laus zis txuas PLCs rau cov khoom siv hauv teb, kuj tseem tau koom ua ke ntau dua rau hauv PLC tswj cov tshuab. Daim ntawv no yuav ua tib zoo tshawb nrhiav daim ntawv thov ntawm PLCs hauv fieldbus systems, npog lub tswvyim, hom, thiab cov yam ntxwv ntawm fieldbus, nrog rau cov kev siv tshwj xeeb thiab qhov zoo ntawm PLCs hauv fieldbus systems.
II. Txheej txheem cej luam ntawm Fieldbus
Fieldbus yog lub network sib txuas lus tsim los txuas cov khoom siv hauv teb (xws li sensors, actuators, thiab instruments) nrog rau kev tswj hwm. Nws xa cov ntaub ntawv xwm txheej thiab tswj cov lus txib ntawm cov teeb liab digital, ua kom cov ntaub ntawv sib pauv thiab kev sib koom ua haujlwm ntawm cov khoom siv. Fieldbus thev naus laus zis nta kev qhib, kev sib koom ua haujlwm, kev faib tawm, digitalization, thiab kev tsim qauv, muab kev txhawb nqa zoo rau kev tsim thiab kev siv cov tshuab automation.
Muaj ntau hom tsheb npav muaj nyob, suav nrog PROFIBUS, EtherCAT, CANopen, ControlNet, SERCOSinterface, Ethernet, thiab PROFINET. Txhua lub tsheb npav muaj cov yam ntxwv sib txawv raws li cov kev xav tau ntawm kev lag luam automation sib txawv. Piv txwv li, PROFIBUS, muaj npe nrov rau nws txoj kev kub ceev, kev cia siab, thiab tus nqi- ua tau zoo, tau siv dav hauv kev tsim khoom siv hluav taws xob, lub tsev automation, txheej txheem automation, thiab lub zog tsim hluav taws xob / kis / xa tawm. EtherCAT, nrog rau nws qhov kev ua tau zoo tshwj xeeb thiab cov neeg siv- txoj hauv kev ua phooj ywg, tau tshwm sim los ua tus thawj coj hauv kev lag luam automation.
III. Kev siv PLC hauv Fieldbus Systems
Raws li cov cuab yeej tseem ceeb hauv kev lag luam automation, PLCs ua lub luag haujlwm tseem ceeb hauv cov tshuab hluav taws xob los ntawm cov ntawv thov hauv qab no:
Kev Tau Txais Cov Ntaub Ntawv thiab Kev Saib Xyuas
PLCs txuas rau cov khoom siv hauv teb los ntawm fieldbus los sau cov ntaub ntawv tiag tiag - lub sijhawm xwm txheej xws li kub, siab, ntws tus nqi, thiab qib kua. Nyob rau tib lub sijhawm, PLCs xa cov ntaub ntawv tau txais mus rau hauv lub khoos phis tawj lossis kev saib xyuas cov tshuab ntawm fieldbus, ua rau cov chaw taws teeb saib xyuas thiab tswj cov khoom siv hauv teb. Cov ntaub ntawv no tau txais thiab kev saib xyuas muaj peev xwm tso cai rau kev lag luam automation kom txuas ntxiv taug qab cov xwm txheej ua haujlwm, tshawb xyuas tam sim thiab daws qhov tsis txaus ntseeg, yog li txhim kho kev ntseeg tau thiab ruaj khov.
Tswj Cov Lus Qhia Tshaj Tawm
Lub PLC tau txais kev tswj hwm cov lus txib los ntawm lub tshuab computer lossis kev tswj hwm ntawm lub chaw nres tsheb, txheeb xyuas cov lus txib no, thiab muab lawv rau cov khoom siv sib txuas. Cov kev tswj hwm no tuaj yeem suav nrog kev ua haujlwm xws li pib / nres, kev hloov ceev, thiab kev hloov pauv hloov pauv, ua kom muaj kev tswj xyuas meej ntawm cov khoom siv hauv teb. Lub PLC tswj kev ua haujlwm tso cai rau kev lag luam automation los kho cov cuab yeej ua haujlwm raws li qhov xav tau tiag tiag, yog li txhim kho kev tsim khoom thiab zoo.
Kev sib txuas lus thiab kev sib koom tes
PLCs sib txuas lus nrog lwm cov PLCs lossis kev tswj hwm ntawm fieldbus, ua kom muaj kev sib pauv ntaub ntawv thiab kev sib koom tes ntawm cov khoom siv. Qhov kev sib txuas lus thiab kev sib koom ua ke muaj peev xwm tso cai rau kev lag luam automation los tsim ib qho kev sib koom ua ke, ua tiav kev sib txuas thiab kev ua haujlwm ntawm cov cuab yeej synchronized. Piv txwv li, nyob rau hauv cov kab ntau lawm, ntau PLCs tuaj yeem sib txuas lus ntawm fieldbus los synchronize ntaus ntawv pib / nres thiab kev hloov kho ceev, txhim kho kab kev sib koom tes thiab kev ua haujlwm zoo.
System Integration thiab Expansion
PLCs tuaj yeem sib koom ua ke thiab nthuav dav nrog lwm cov kev tswj hwm ntawm fieldbus los ua kom loj dua -scale industrial automation systems. Qhov kev sib koom ua ke thiab kev nthuav dav no tso cai rau kev lag luam automation tshuab los ntsuas lawv cov haujlwm thiab qhov loj raws li xav tau, ua tau raws li ntau hom kev ua haujlwm thiab cov ntawv thov. Piv txwv li, nyob rau hauv lub tsev automation systems, PLCs muaj peev xwm integrate thiab nthuav nrog hluav taws kub tswb systems, HVAC systems, teeb pom kev zoo, thiab lwm yam., los ntawm fieldbus mus cuag centralized tswj thiab tswj ntawm ntau yam khoom siv hauv tsev.
IV. Qhov zoo ntawm PLCs hauv Fieldbus Applications
PLCs muaj ntau qhov zoo tshaj plaws thaum siv hauv fieldbus systems:
Siab tiag -Sijhawm Ua Haujlwm
Los ntawm kev txuas mus rau cov khoom siv hauv teb los ntawm fieldbus, PLCs tuaj yeem sau cov ntaub ntawv tiag tiag - lub sijhawm thiab cov teeb meem tswj cov lus txib, ua kom muaj kev saib xyuas tam sim thiab tswj cov khoom siv. Qhov siab tiag tiag no - lub sijhawm muaj peev xwm tso cai rau kev lag luam automation systems kom paub sai thiab daws qhov tsis txaus ntseeg, txhim kho tag nrho cov kev ntseeg tau thiab ruaj khov.
Kev ntseeg siab
PLCs muaj kev cuam tshuam tsis zoo thiab ua txhaum cai, ua kom muaj kev ruaj ntseg hauv qhov chaw hnyav. Concurrently, fieldbus thev naus laus zis kuj tseem muaj kev cuam tshuam tsis zoo thiab kev ua txhaum cai, lav kev ruaj ntseg thiab ruaj khov cov ntaub ntawv xa mus. Qhov kev ntseeg siab no ua rau muaj kev lag luam automation ua haujlwm ruaj khov nyob rau lub sijhawm ntev.
Siab Flexibility
PLCs thiab fieldbus thev naus laus zis muab kev hloov pauv tseem ceeb, tso cai rau cov txheej txheem tsim kho thiab nthuav dav raws li qhov xav tau tiag tiag. Txawm hais tias nce cov cuab yeej suav, txuas ntxiv ua haujlwm, lossis txhim kho cov tshuab, cov kev hloov pauv no tuaj yeem ua tiav los ntawm kev teeb tsa yooj yim thiab kev ua haujlwm. Qhov kev hloov pauv no ua rau muaj kev lag luam automation kom hloov mus rau ntau yam kev xav tau thiab cov xwm txheej.
Tus nqi qis
PLC thiab fieldbus thev naus laus zis siv cov txheej txheem kev sib txuas lus thiab cov cuab yeej sib txuas, ua kom muaj kev sib txuas thiab kev sib txuas lus ntawm cov cuab yeej los ntawm cov tuam txhab sib txawv. Qhov kev tsim qauv no txo cov nqi kev sib koom ua ke thiab kev saib xyuas tsis yooj yim, ua rau kev lag luam automation cov nqi ntau dua - zoo.
V. Xaus
Daim ntawv thov ntawm PLCs nyob rau hauv fieldbus systems muab ntau yam zoo rau kev lag luam automation, nrog rau siab tiag tiag - lub sij hawm ua tau zoo, muaj kev ntseeg siab, tshwj xeeb saj zawg zog, thiab tus nqi qis. Raws li kev lag luam automation thev naus laus zis txuas ntxiv mus, PLCs thiab thev naus laus zis thev naus laus zis yuav pom ntau daim ntawv thov thoob plaws ntau thaj chaw thiab cov xwm txheej, tsav kev txhim kho txuas ntxiv hauv cov qauv kev lag luam automation.