Lub tswv yim ntawm PLC
PLC stands rau Programmable Logic Controller, tseem hu ua programmable controller. Nws yog ib hom digital computer tshwj xeeb tsim los tswj cov khoom siv hluav taws xob, cov txheej txheem tsim khoom, thiab kev lag luam automation systems hauv industrial automation. Nws lub luag haujlwm tseem ceeb yog ua cov txheej txheem thiab tswj cov cim digital. PLC feem ntau muaj cov khoom hauv qab no:
1. Central Processing Unit (CPU):Lub hauv paus tseem ceeb ntawm PLC system, lub luag haujlwm rau kev ua cov cim tawm tswv yim thiab ua haujlwm zoo. Nws tswj cov xwm txheej ntawm tus tswv tsev thiab cov khoom siv peripheral raws li cov lus qhia programmed.
2. Input/Output Modules:Interface circuits rau PLC input thiab output. Lawv hloov cov teeb liab analog lossis digital rau hauv tshuab- nyeem tau cov cim rau kev ua haujlwm los ntawm CPU. Lawv kuj tso tawm cov teeb liab ua tiav los ntawm CPU rau cov khoom siv peripheral rau kev tswj.
3. Fais Fab Module:Muab lub zog rau PLC system, feem ntau yog siv cov tswj hluav taws xob thiab tam sim no los muab lub zog thauj khoom thiab ua kom lub cev muaj zog.
4. Cov khoom siv programming:Siv los sau PLC cov kev pab cuam, feem ntau suav nrog cov programming software, programmer, thiab txuas cables. Los ntawm kev sau cov kev pab cuam, ntau yam kev lag luam automation tswj kev ua tiav tuaj yeem ua tiav, xws li kev tswj cov khoom thauj, kev ua haujlwm, thiab kev tswj hwm.
PLC systems tau txais - ntiaj teb cov teeb liab los ntawm cov khoom siv tswv yim xws li sensors lossis actuators. Tom qab ua tiav cov teeb liab no los ntawm kev tsim- hauv cov kev pab cuam, lawv tso tawm cov teeb liab tswj kom ua tiav cov kev tswj hwm tsis siv neeg thiab kev tiv thaiv kev ua haujlwm hauv kev lag luam automation tswj. PLCs muaj peev xwm xav tau tus kheej, txiav txim siab, txiav txim, thiab ua raws cov lus qhia. Yog li ntawd, lawv daim ntawv thov yog dav heev, ua si lub luag hauj lwm irreplaceable nyob rau hauv industrial automated ntau lawm.
PLC Txoj Cai Ua Haujlwm
Lub hauv paus ntsiab lus ua haujlwm PLC feem ntau suav nrog tsib kauj ruam:
1. Input Signal Acquisition:Lub PLC sau tiag- ntiaj teb cov teeb liab los ntawm cov khoom siv hluav taws xob thiab cov sensors- xws li kub, siab, lossis ceev- los ntawm cov chaw nres nkoj nkag.
2. Kev ua haujlwm teeb liab:PLC ua cov cim tau txais, digitizing cov ntaub ntawv los ntawm kev ua haujlwm xws li calibration, filtering, amplification, or attenuation.
3. Kev Tswj Xyuas Kev Ua Haujlwm:PLC sib piv cov txheej txheem ua tiav nrog cov kev pab cuam sab hauv, ua kev suav thiab kev ua haujlwm zoo los txiav txim siab cov teeb liab tso tawm thiab ua raws li kev tswj hwm.
4. Tso zis teeb liab tswj:Lub PLC tso tawm cov teeb liab tsim los ntawm kev ua haujlwm rau cov chaw nres nkoj, tswj kev ua haujlwm ntawm cov actuators lossis ntau yam khoom siv hluav taws xob.
5. Kev Saib Xyuas Kev Ua Haujlwm:PLC kuj tseem muaj peev xwm saib xyuas, ua kom muaj kev tshawb nrhiav qhov system dynamic, kuaj xyuas, thiab kev ua txhaum cai kom ntseeg tau tias kev ruaj ntseg thiab kev nyab xeeb ntawm kev ua haujlwm.
Tag nrho PLC workflow yog raws li kev nco thiab tswj cov kev pab cuam. PLC muaj ib lub khoos phis tawj tshwj xeeb thiab cov programmable logic controllers. Nws tiag tiag - lub sijhawm ua haujlwm thiab cov lus teb sai yog qhov tseem ceeb rau kev tswj xyuas cov tshuab. Qhov kev zov me nyuam khaws cia hauv PLC lub cim xeeb suav nrog cov khoom siv tawm tswv yim, kev ua haujlwm, thiab tso tawm cov haujlwm ua haujlwm. Cov kev ua haujlwm no hloov mus rau cov kev hloov pauv hauv cov teeb liab tawm tswv yim, tsis tu ncua kho cov teeb liab tawm tshiab. Qhov kev zov me nyuam khaws cia ua haujlwm xws li kev ua haujlwm zoo, kev ua haujlwm sib piv, sijhawm, suav, thiab ntau dua los ua cov khoom nkag thiab tswj cov teeb liab tawm.
Hauv cov ntsiab lus, txoj hauv kev ua haujlwm ntawm PLC-raws li kev tswj hwm automation cia siab rau plaub kauj ruam tseem ceeb: cov tswv yim teeb liab hloov dua siab tshiab, nco cia, kev ua haujlwm, thiab cov teeb liab tso tawm. Los ntawm cov kauj ruam no, tiag tiag - ntiaj teb cov teeb liab tau hloov mus rau hauv kev tswj cov teeb liab, ua rau lub tshuab hluav taws xob ntawm cov txheej txheem tswj cov txheej txheem.
Qhov zoo thiab qhov tsis zoo ntawm PLCs
PLC, los yog Programmable Logic Controller, yog ib qho tseem ceeb ntawm kev tswj cov khoom siv hauv kev lag luam niaj hnub no. Nws thawj qhov zoo thiab qhov tsis zoo yog raws li hauv qab no:
Qhov zoo ntawm PLCs:
1. Kev ntseeg siab:PLCs muaj cov qauv tsim qauv yooj yim uas txo qis kev pheej hmoo tsis ua haujlwm thiab hloov mus rau ntau qhov chaw ib puag ncig. Ntau yam kev tiv thaiv, suav nrog hauv nruab nrab processor thaub qab thiab lub cim xeeb sab hauv, ua kom muaj kev txhim khu kev lag luam automation tswj.
2. Scalability:PLC systems muab kev ua haujlwm ruaj khov thiab nthuav dav. Kev hloov kho thiab kev txuas ntxiv tuaj yeem ua tiav los ntawm kev hloov kho software / kho vajtse thiab ntxiv I / O modules, ua tau raws li ntau yam kev thov.
3. Yooj yim Programming thiab hloov kho:PLC programming txhawb ntau tus qauv thiab siv txoj hauv kev modular, ua kom yooj yim rau kev tsim thiab hloov kho. Tsis tas li ntawd, thaum lub sijhawm ua haujlwm tiag tiag, PLCs ua kom tau tiag tiag- lub sijhawm soj ntsuam thiab hloov kho cov nqi nkag / tawm, tso cai rau kev hloov kho yam tsis muaj kev kaw haujlwm.
4. Muaj peev xwm ua cov ntaub ntawv muaj zog:PLCs txhawb ntau lub tswv yim / tso zis teeb liab ua, ua kom cov dej num xws li kev tswj xyuas logic, suav, thiab ua cov ntaub ntawv. Lawv muaj peev xwm ua cov ntaub ntawv thiab kev txheeb xyuas cov ntaub ntawv.
Qhov tsis zoo ntawm PLCs:
1. Kev Txhim Kho Siab thiab Kev Kho Tus Nqi:PLC txoj kev txhim kho thiab kev saib xyuas tau txais cov nuj nqis tseem ceeb, yuav tsum muaj pab pawg tshwj xeeb rau kev tu thiab hloov kho.
2. High Programming Barrier:PLC programming nta cov qauv tshwj xeeb thiab cov txheej txheem, xav tau tshwj xeeb programming kev txawj ntse nrog kev kawm nkhaus. Cov txheej txheem PLC sib txawv yuav tsum muaj cov txheej txheem sib txawv thiab kev debugging.
3. Kev txwv ib puag ncig:PLCs feem ntau yog siv rau hauv hnyav lossis siab -ib puag ncig suab nrov. Yog li ntawd, lawv nquag ua haujlwm tsis zoo hauv cov xwm txheej uas muaj qhov kub thiab txias, av noo, lossis plua plav .
Hauv cov ntsiab lus, thaum PLCs ua haujlwm tseem ceeb ntawm kev tswj xyuas kev lag luam niaj hnub nrog kev ruaj ntseg thiab kev ntseeg siab, lawv kuj nthuav qhia qee qhov kev txwv thiab qhov tsis zoo.
Lub tswvyim ntawm DCS
DCS stands rau Distributed Control System, ib tug paub tab txheej txheem automation tswj system. DCS ntiav cov kev tswj xyuas kev faib tawm, faib kev tswj cov haujlwm hla ntau tus tswj kev faib tawm kom ua tiav kev tswj hwm zoo thiab ua kom zoo rau tag nrho cov txheej txheem.
DCS cov txheej txheem raug kho, teeb tsa, thiab tsim los ntawm cov kws tshaj lij thiab cov kws tshaj lij raws li kev thov kev lag luam thiab cov neeg siv khoom xav tau.
Lub kaw lus DCS muaj ntau yam khoom, nrog rau kev teeb tsa tseem ceeb tshaj plaws suav nrog yam tsawg kawg hauv qab no: cov khoom siv nkag / tso tawm, cov tswj hwm, tib neeg - tshuab cuam tshuam, thiab kev sib txuas lus. Input / output modules tsim cov txheej txheem lub cev ntawm DCS system, hloov cov teeb liab electromechanical los ntawm cov txheej txheem tswj rau hauv cov teeb liab digital rau kev tswj xyuas. Cov tswj hwm, feem ntau cov chaw ua haujlwm lossis cov servers, ua haujlwm thawj zaug thiab tswj cov haujlwm hauv DCS system. Tib neeg- tshuab interface ua haujlwm tseem ceeb ntawm kev sib txuas ntawm DCS system thiab cov neeg ua haujlwm, suav nrog cov duab kos duab thiab lub tswb. Kev sib txuas lus sib txuas ua ke tsim lub hauv paus ntawm DCS system, sib cuam tshuam tag nrho cov khoom.
Lub luag haujlwm tseem ceeb ntawm DCS system yog kom ua tiav cov txheej txheem kev lag luam automated, encompassing cov ntaub ntawv tau, ua, tsom xam, thiab tswj kev ua haujlwm. Qhov no pab txhawb kev txhim kho kev tsim khoom, ua kom cov khoom zoo, txo cov nqi tsim khoom, thiab txhim kho cov neeg siv khoom txaus siab.
Hauv cov ntsiab lus, DCS system nta ib qho kev faib khoom uas muaj cov haujlwm xws li kev tswj hwm thiab tib neeg - tshuab interface raug faib thoob plaws ntau lub modules. Qhov kev tsim no muaj qhov tshwj xeeb yooj yooj yim thiab kev ntseeg tau, ua rau nws nyiam cov txheej txheem automation tswj qhov system rau ntau lub lag luam.
DCS ua haujlwm li cas
DCS (Distributed Control System) yog ib qho kev tswj hwm automation uas tsim los ntawm ntau qhov kev faib tawm, sib cuam tshuam tswj modules. Nws txuas cov khoom siv hauv teb thiab cov tswj xws li DI / DO thiab AI / AO ntawm tes hauj lwm. Los ntawm kev ua haujlwm zoo li kev tau txais cov ntaub ntawv, kev ua haujlwm, kev sib kis, thiab kev tswj hwm, nws ua haujlwm tswj cov txheej txheem kev lag luam thiab sau cov ntaub ntawv. Nws cov hauv paus ntsiab lus ua haujlwm yog raws li hauv qab no:
1. Cov ntaub ntawv tau txais thiab xa tawm:Lub kaw lus DCS sau cov ntaub ntawv xwm txheej thiab kev ua haujlwm tsis zoo los ntawm cov txheej txheem engineering- xws li kub, ntws tus nqi, siab, thiab ceev- ntawm ntau lub sensors thiab actuators. Cov ntaub ntawv no raug xa mus rau lub hauv paus tswj hwm los ntawm kev sib txuas hauv network.
2. Logical Control thiab Algorithm Processing:Lub DCS ua cov kev tswj kom muaj nuj nqis thiab kev ua algorithmic ntawm cov ntaub ntawv xa mus. Qhov no suav nrog kev txiav txim siab tswj cov tswv yim, ua tiav algorithms, thiab saib xyuas cov txheej txheem cov ntaub ntawv kom ruaj ntseg, nyab xeeb, thiab ua haujlwm tau zoo.
3. Tshaj Tawm Cov Lus Qhia Txog Kev Tswj:Raws li cov ntaub ntawv ua tiav, DCS teeb meem tswj cov lus txib- xws li cov lus qhia ua, hloov cov lus txib, ceeb toom teeb liab, thiab kev txiav txim kaw - los tswj thiab tswj cov txheej txheem kev lag luam.
4. Kev Saib Xyuas Kev Tswj Xyuas Kev Tswj Xyuas thiab Kev Teeb Meem:Lub kaw lus DCS suav nrog tus kheej- saib xyuas thiab tus kheej- muaj peev xwm kuaj xyuas kom sai sai thiab daws cov teeb meem ntau yam, ua kom muaj kev ua haujlwm ruaj khov. Thaum lub sijhawm ua haujlwm, nws tsis tu ncua saib xyuas qhov tseeb - lub sijhawm ntawm txhua yam khoom thiab teeb meem ceeb toom rau cov neeg ua haujlwm ceeb toom rau kev cuam tshuam raws sijhawm.
Hauv cov ntsiab lus, raws li lub hauv paus ntawm kev lag luam automation tswj systems, DCS systems feature faib architecture, centralized tswj, siab ntseeg, thiab scalability. Lawv txo qis kev pov tseg ntawm cov neeg ua haujlwm, cov khoom siv, thiab cov peev txheej thaum txhim kho kev tsim khoom thiab kev ua tau zoo, txo cov nqi tsim khoom, thiab xa cov kev zam.
Qhov zoo thiab qhov tsis zoo ntawm DCS
Qhov zoo ntawm DCS:
1. Muaj peev xwm sib koom ua ke muaj zog:DCS cov tshuab tuaj yeem koom ua ke tswj cov nodes los ntawm ntau cov txheej txheem tsim khoom rau hauv ib qho system, ua kom cov ntaub ntawv thiab kev sib koom ua ke kom yooj yim dua thiab tswj tau zoo.
2. Kev ntseeg siab:DCS systems siv cov kev tswj xyuas kev faib tawm. Txawm hais tias ib leeg tsis ua haujlwm, lwm cov nodes tuaj yeem txuas ntxiv ua haujlwm ib txwm, ua tiav kev tswj hwm zoo.
3. Zoo tiag tiag - Lub Sijhawm Tswjhwm Ua Haujlwm:DCS systems muab lub sijhawm tiag tiag - saib xyuas cov txheej txheem tsim khoom, cia li sau thiab ua cov ntaub ntawv nrog lub zog tiag tiag - lub sijhawm muaj peev xwm, ua rau kev ua tiav ncaj qha.
4. Scalability:DCS systems txhawb kev nthuav dav modular. Los ntawm kev hloov kho lossis hloov kho cov khoom siv kho vajtse xws li cov tswj hwm thiab I / O modules, lub kaw lus tswj tau tuaj yeem txuas ntxiv.
5. Tus neeg siv-Tus phooj ywg:Lub DCS qhov kev ua haujlwm interface tuaj yeem hloov kho raws li cov neeg siv khoom xav tau, muab kev hloov pauv siab thiab siv tau yooj yim.
Disadvantages ntawm DCS:
1. Cov txheej txheem nyuaj nrog cov nqi siab:DCS systems yog qhov nyuaj hauv kev teeb tsa, kev teeb tsa, thiab kev saib xyuas, xav tau ntau tus neeg ua haujlwm thiab sijhawm peev.
2. Cov nqi kho mob siab:Txij li thaum DCS systems tau tsim, ntsia, thiab ua haujlwm ntawm -site, kev saib xyuas tej thaj chaw deb yog qhov nyuaj rau kev siv. Yog li ntawd, cov nqi cuam tshuam nrog kev daws teeb meem lossis kev hloov kho tshiab yuav yog qhov siab.
3. Management complexity:Vim muaj qhov sib txawv ntawm DCS systems, cov kws tshaj lij pab pawg yuav tsum tau ua haujlwm kom raug. Kev tuav tsis raug yuav ua rau muaj kev cuam tshuam tsis zoo, ua rau kev tswj hwm qhov nyuaj.
Zuag qhia tag nrho, txawm tias muaj kev sib tw hauv cov nqi thiab kev ua haujlwm, DCS cov tshuab tau siv dav hauv kev lag luam tshwj xeeb vim lawv qhov zoo hauv kev tswj thiab saib xyuas. Lawv ua tau zoo nyob rau hauv kev tswj cov khoom lag luam ywj pheej, ua kom cov txheej txheem ua haujlwm zoo los ntawm cov txheej txheem xws li cov twj hydraulic thiab cov kua theem tswj, yog li xa cov lag luam tseem ceeb thiab kev lag luam.
Qhov sib txawv ntawm PLC thiab DCS
Ob leeg PLC thiab DCS yog cov cuab yeej siv hauv kev tswj hwm kev lag luam. Lawv cov kev sib txawv tseem ceeb yog raws li hauv qab no:
1. Daim ntawv thov sib txawv:PLCs tsim nyog rau kev tswj xyuas cov haujlwm ntawm cov kab ntau lawm, xws li hloov, suav, thiab sijhawm. DCS, txawm li cas los xij, yog tsim los rau kev tswj cov txheej txheem tsis tu ncua, xws li tsis zoo xws li concentration, kub, thiab ntws tus nqi hauv cov nroj tsuag tshuaj.
2. System Architecture:PLCs ua haujlwm raws li kev tswj hwm hauv nruab nrab, qhov twg txhua qhov kev tswj hwm tau ua tiav los ntawm ib tus tswj hwm hauv nruab nrab. DCS, txawm li cas los xij, ntiav cov kev tswj hwm kev faib tawm. Nws cov maub los thiab cov khoom siv tawm tswv yim / tso tawm tau tawg mus thoob plaws qhov chaw sib txawv, sib txuas lus thiab sib pauv tswj cov cim ntawm cov ntaub ntawv sib txuas lus.
3. Tswj txoj kev:PLCs txhawb kev ua ntu zus -raws li thiab logic-raws li kev tswj hwm, ua kom nrawm, meej ua tiav ntawm cov kev tswj xyuas tsis sib xws thaum txhawb nqa I/O ntau yam khoom siv. DCS cov txheej txheem tseem ceeb ua ntej cov txheej txheem sib txawv ntawm kev tswj thiab saib xyuas, muab cov peev txheej zoo tshaj hauv cov txheej txheem kev kwv yees thiab kev kwv yees.
4. Programming Approaches:PLCs, tsom mus rau kev ua haujlwm tsis tu ncua, feem ntau siv cov lus piav qhia ntaiv rau kev ua haujlwm. DCS ntiav ntau dua kev ua haujlwm thoob ntiaj teb thaiv kev ua haujlwm, ua rau muaj txiaj ntsig zoo dua -cov haujlwm ua tau zoo.
5. Kev ntseeg me ntsis txawv:PLC cov cuab yeej muaj kev ntseeg siab nrog kev cuam tshuam zoo thiab kev ua txhaum cai, ua kom muaj kev ruaj ntseg hauv kev lag luam ib puag ncig. DCS ua qhov tseem ceeb ntawm kev ntseeg siab ntawm txhua tus, siv cov kev ntsuas xws li tsib- cov cuab yeej tiv thaiv qib thiab cov ntaub ntawv rov ua dua tshiab los lav kev lag luam hauv online ruaj khov.
Hauv cov ntsiab lus, PLCs thiab DCSs tsis yog tsuas yog ua haujlwm rau ntau qhov sib txawv tab sis kuj muaj qhov sib txawv ntawm cov txheej txheem tswj, kev tsim qauv, kev ua haujlwm, thiab kev ntseeg siab thoob plaws hauv cov txheej txheem tswj. Rau cov ntawv thov kev lag luam uas xav tau kev ua haujlwm siab hauv cov txiaj ntsig, DCS tuav qhov kom zoo dua. Hloov pauv, PLCs yog qhov tsim nyog rau cov xwm txheej ua ntej qhov ua tau zoo thiab muaj peev xwm ua txhaum txoj cai.