I. Kev Taw Qhia
Nyob rau hauv niaj hnub kev lag luam automation tswj systems, daim ntawv thov ntawm Programmable Logic Controllers (PLCs) tau dhau los ua qhov dav heev. Txhawm rau kom ua tiav cov txheej txheem ntau lawm thiab kev ruaj ntseg, PLC cov txheej txheem rov ua haujlwm tau txais txiaj ntsig tseem ceeb thiab kev coj ua raws li kev daws teeb meem tseem ceeb. Daim ntawv no muab cov ncauj lus qhia ntxaws ntxaws txog cov txheej txheem teeb tsa thiab cov qauv kev ua haujlwm ntawm PLC redundant systems. Los ntawm cov ntaub ntawv tshawb fawb, nws qhia txog lawv cov ntawv thov thiab kev ua tau zoo hauv kev lag luam automation tswj.
II. Txhais ntawm PLC Redundant Systems
PLC redundant system yog hais txog cov thev naus laus zis uas txhim kho kev ntseeg tau thiab ruaj khov los ntawm kev teeb tsa cov khoom siv tsis tu ncua thiab cov khoom siv software hauv PLC tswj qhov system. Thaum ib qho kev tivthaiv lossis ib feem hauv lub kaw lus tsis ua haujlwm, qhov rov ua haujlwm rov ua haujlwm tau hloov mus rau qhov kev tivthaiv thaub qab lossis ib feem, ua kom muaj kev ua haujlwm zoo ntawm tag nrho lub cev.
III. Configuration Methods rau PLC Redundant Systems
Cov txheej txheem kev teeb tsa rau PLC redundant systems feem ntau suav nrog cov hauv qab no:
Dual{0}}Machine Hot Standby Configuration
Lub dual -machine kub standby configuration yog feem ntau mus kom ze nyob rau hauv PLC redundancy systems. Qhov kev teeb tsa no ntiav ob tus PLC zoo ib yam: ib qho ua haujlwm ua tus thawj tswj hwm, thaum lwm qhov ua haujlwm ua tus tswj hwm thaub qab. Tus thawj tswj tswj lub sijhawm tiag tiag - lub sijhawm ua haujlwm, thiab tus tswj hwm thaub qab tsis tu ncua saib xyuas tus thawj tswj hwm txoj haujlwm ua haujlwm. Yog tias tus thawj tswj hwm tsis ua haujlwm, tus tswj hwm thaub qab tam sim ntawd ua haujlwm tswj xyuas, ua kom tsis muaj kev cuam tshuam kev ua haujlwm.
Qhov zoo:Kev hloov pauv ceev ceev, txo qhov cuam tshuam ntawm kev ua tsis tiav ntawm cov txheej txheem ntau lawm.
Qhov tsis zoo:Xav tau cov khoom siv kho vajtse thiab software ntxiv, ua rau cov nqi ntau dua.
Dual -Machine Cold Backup Configuration
Tsis zoo li cov txheej txheem thaub qab kub, tus tswj hwm thaub qab hauv qhov kev teeb tsa thaub qab txias tsis koom nrog -cov haujlwm tswj lub sijhawm thiab tseem nyob hauv hom standby. Thaum tus thawj tswj tsis ua haujlwm, tus tswj hwm thaub qab yuav tsum tau hloov pauv mus rau lub xeev ua haujlwm.
Qhov zoo:Tus nqi qis dua vim tus tswj hwm thaub qab tsis tas yuav tsum tau ua haujlwm tiag tiag - sijhawm.
Qhov tsis zoo:Slower switchover ceev, tej zaum yuav tsum tau ib co downtime.
Multi-PLC Redundancy Configuration
Hauv ntau daim ntawv thov nyuaj, ntau PLC tswj yuav tsum tau ua kom rov ua dua. Qhov no configuration ntxiv txhim khu kev ntseeg tau thiab stability. Multi-PLC redundancy tuaj yeem hloov kho raws li cov kev xav tau tshwj xeeb, xws li peb -PLC kub thaub qab lossis plaub-PLC txias thaub qab.
Qhov zoo:Muaj peev xwm tuav ntau qhov teeb meem tsis ua haujlwm, txhim kho kev ntseeg tau thiab ruaj khov.
Qhov tsis zoo:Tus nqi siab dua, xav tau kev pab kho vajtse thiab software ntxiv.
IV. Cov Ntsiab Cai Ua Haujlwm ntawm PLC Redundancy Systems
Cov qauv kev ua haujlwm ntawm PLC redundancy systems feem ntau suav nrog cov hauv qab no:
Cov ntaub ntawv synchronization
Nyob rau hauv lub PLC redundancy system, tiag tiag -sijhawm cov ntaub ntawv synchronization yuav tsum tshwm sim ntawm thawj thiab backup controllers. Qhov no suav nrog cov kev tswj hwm, cov tswv yim / tso zis, cov hloov pauv nruab nrab, thiab ntau dua. Los ntawm cov ntaub ntawv synchronization, tus tswj thaub qab tswj lub sijhawm tiag tiag - lub sijhawm paub txog tus thawj tswj hwm txoj haujlwm ua haujlwm, ua rau nws tuaj yeem tswj hwm cov haujlwm thaum xav tau.
Fault Detection
Lub PLC redundant system yuav tsum kuaj xyuas qhov tsis raug ntawm tus thawj tswj hauv lub sijhawm. Qhov no feem ntau ua tiav los ntawm kev sib xyaw ntawm cov khoom siv thiab software. Piv txwv li, ib qho khoom siv saib xyuas hluav taws xob tuaj yeem saib xyuas PLC tus tswj xyuas kev ua haujlwm, thaum software tuaj yeem kuaj xyuas qhov ua tsis raug los ntawm kev txheeb xyuas qhov ua tiav ntawm cov kev tswj hwm, I / O xeev, thiab lwm yam.
Automatic Switchover
Thaum kuaj pom tus thawj tswj tsis ua haujlwm, PLC redundant system yuav tsum tau hloov mus rau tus tswj thaub qab. Qhov no feem ntau ua tiav los ntawm predefined switchover logic. Lub logic hloov pauv tuaj yeem hloov kho tau tsim raws li cov kev xav tau tshwj xeeb, xws li lub sijhawm- hloov pauv lossis tsis ua haujlwm- hom- raws li kev hloov pauv.
Redundancy Management
Txhawm rau kom muaj kev ua haujlwm ruaj khov thiab kev ruaj ntseg, PLC redundancy systems kuj xav tau kev tswj xyuas rov ua dua. Qhov no suav nrog redundancy resource configuration, fault handle, thiab system rov qab. Los ntawm kev tswj hwm redundancy, kev kho sai sai ntawm kev ua haujlwm ntawm lub cev thaum lub sijhawm ua tsis tiav yog lav.
V. Case Study
Xav txog lub tuam txhab petrochemical uas siv PLC redundancy system raws li Siemens S7-400H. Lub kaw lus ntiav ob lub tshuab kub standby teeb tsa, nrog cov thawj thiab thaub qab controllers txuas nrog fiber ntau optic cables rau cov ntaub ntawv synchronization. Thaum lub sijhawm ua haujlwm tiag tiag, lub kaw lus no tau ua tiav ntau yam kev tswj hwm qhov tsis ua haujlwm, ua kom cov txheej txheem ntau lawm thiab ruaj khov. Nyob rau tib lub sijhawm, los ntawm nws cov peev txheej tswj kev rov ua dua tshiab, lub kaw lus ua rau muaj kev ua txhaum sai sai thiab kev ua haujlwm rov qab ua haujlwm.
VI. Xaus thiab Outlook
Raws li ib qho tseem ceeb ntawm kev lag luam automation tswj tshuab, PLC redundancy systems ua lub luag haujlwm tseem ceeb hauv kev ua kom muaj kev ntseeg siab thiab ruaj khov. Los ntawm kev teeb tsa kev tsim nyog thiab kev tsim qauv, lawv xa cov khoom muaj siab thiab muaj peev xwm rov qab tau sai. Nrog rau kev nce qib tsis tu ncua thiab kev tsim kho tshiab hauv kev lag luam automation thev naus laus zis, PLC redundancy systems yuav pom kev siv dav dav hauv ntau hom kev thov. Peb kuj cia siab tias yuav tshwm sim thiab kev txhim kho ntawm cov thev naus laus zis tshiab, uas yuav qhib qhov muaj peev xwm ntxiv rau kev lag luam automation tswj.