Programmable Logic Controller Control Muaj nuj nqi xaiv

Tswj kev xaiv xaiv
Qhov kev xaiv no suav nrog kev xaiv cov yam ntxwv xws li kev ua haujlwm, kev tswj hwm kev ua haujlwm, kev sib txuas lus, kev ua haujlwm hauv kev ua haujlwm, kev kuaj mob thiab kev ua haujlwm ceev.
1. Kev ua haujlwm ua haujlwm
Kev ua haujlwm ntawm cov programmable logic maub los yooj yim suav nrog kev ua haujlwm zoo, sijhawm thiab suav ua haujlwm; kev ua haujlwm ntawm cov programmable logic maub los kuj suav nrog cov ntaub ntawv hloov pauv, sib piv thiab lwm yam haujlwm ua haujlwm; ntau txoj haujlwm ua haujlwm suav nrog kev ua haujlwm algebraic, xa cov ntaub ntawv, thiab lwm yam .; loj programmable logic controllers kuj muaj analog PID lag luam thiab lwm yam kev ua haujlwm siab heev. Nrog rau qhov tshwm sim ntawm qhib systems, programmable logic controllers muaj kev sib txuas lus ua haujlwm. Qee cov khoom muaj kev sib txuas lus nrog cov khoos phis tawj qis, qee cov khoom muaj kev sib txuas lus nrog cov phooj ywg computers lossis cov khoos phis tawj sab saud, thiab qee cov khoom kuj muaj cov ntaub ntawv sib txuas lus nrog cov chaw tsim khoom lossis kev lag luam network. Thaum tsim thiab xaiv, peb yuav tsum pib los ntawm cov kev cai ntawm cov ntawv thov tiag tiag thiab tsim nyog xaiv cov haujlwm uas yuav tsum tau ua. Hauv cov ntawv thov feem ntau, tsuas yog kev ua haujlwm zoo thiab lub sijhawm thiab suav cov haujlwm tsuas yog yuav tsum tau ua, thiab qee qhov kev siv yuav tsum tau xa cov ntaub ntawv thiab sib piv. Thaum siv rau kev tshawb nrhiav thiab kev tswj hwm analog, kev ua haujlwm algebraic, kev hloov pauv lej thiab kev ua haujlwm PID yog siv. Kev txiav txim siab thiab encoding yuav tsum tau ua kom pom cov ntaub ntawv.
2. Tswj muaj nuj nqi
Kev tswj hwm muaj xws li PID tswj kev ua haujlwm, kev them nyiaj pub rau kev tswj hwm kev lag luam, kev ua haujlwm piv txwv, thiab lwm yam, uas yuav tsum tau txiav txim siab raws li kev tswj hwm. Programmable logic controllers feem ntau yog siv rau kev tswj xyuas cov logic. Yog li ntawd, ib leeg-loop los yog ntau-loop controllers feem ntau siv nyob rau hauv feem ntau cov neeg los daws cov analog tswj. Qee lub sij hawm, cov tswv yim ntse ntse thiab cov khoom siv tau siv los ua kom tiav cov haujlwm tswj hwm uas yuav tsum tau ua, txhim kho kev ua haujlwm ceev ntawm cov programmable logic controllers thiab txuag lub peev xwm nco. Piv txwv li, PID tswj units, high-speed counters, analog units nrog ceev them nyiaj, ASC code conversion units, thiab lwm yam. [5]
3. Kev sib txuas lus muaj nuj nqi
Qhov loj thiab nruab nrab qhov programmable logic controller systems yuav tsum txhawb ntau lub tsheb npav thiab cov txheej txheem kev sib txuas lus (xws li TCP / IP), thiab yuav tsum muaj peev xwm txuas mus rau lub Hoobkas tswj kev sib txuas (TCP / IP) thaum tsim nyog. Cov txheej txheem kev sib txuas lus yuav tsum ua raws li ISO / IEEE cov qauv kev sib txuas lus thiab yuav tsum yog kev sib txuas lus qhib. [5]
Kev sib txuas lus sib txuas ntawm lub programmable logic controller system yuav tsum suav nrog kev sib txuas lus sib txuas thiab sib txuas, RIO kev sib txuas lus chaw nres nkoj, feem ntau siv DCS interfaces, thiab lwm yam.; lub tsheb npav kev sib txuas lus (nrog rau cov khoom siv sib txuas thiab cov cables) ntawm qhov loj thiab nruab nrab qhov programmable logic controllers yuav tsum yog 1: 1 redundantly configured, lub tsheb npav sib txuas lus yuav tsum ua raws li cov qauv thoob ntiaj teb, thiab kev sib txuas lus nyob deb yuav tsum ua tau raws li qhov xav tau ntawm lub cuab yeej.
Hauv kev sib txuas lus ntawm PLC system, qhov kev sib txuas lus ntawm lub network sab saud yuav tsum siab dua 1Mbps, thiab kev sib txuas lus yuav tsum tsis pub tshaj 60%. Cov ntaub ntawv tseem ceeb ntawm kev sib txuas lus network ntawm PLC system yog raws li hauv qab no:
1) PC yog tus tswv chaw nres tsheb, thiab ntau PLCs ntawm tib tus qauv yog qhev chaw nres tsheb, tsim ib qho yooj yim PLC network;
2) Ib PLC yog lub chaw nres tsheb tswv, thiab lwm yam PLCs ntawm tib tus qauv yog qhev chaw nres tsheb, tsim ib tug tswv- qhev PLC network;
3) PLC network txuas nrog DCS loj los ntawm kev sib txuas lus tshwj xeeb raws li subnet ntawm DCS;
4) Dedicated PLC network (mob siab PLC kev sib txuas lus network ntawm txhua lub chaw tsim khoom).
Txhawm rau txo cov haujlwm ntawm CPU kev sib txuas lus, raws li qhov xav tau tiag tiag ntawm lub network muaj pes tsawg leeg, cov txheej txheem kev sib txuas lus nrog kev sib txuas lus sib txawv (xws li point-to-point, fieldbus) yuav tsum raug xaiv.
4. Programming muaj nuj nqi
Offline programming hom: PLC thiab tus programmer sib koom CPU. Thaum tus programmer nyob hauv hom programming, CPU tsuas yog muab kev pabcuam rau tus programmer thiab tsis tswj cov khoom siv hauv teb. Tom qab programming tiav, tus programmer hloov mus rau hom kev khiav, thiab CPU tswj cov khoom siv hauv teb thiab tsis tuaj yeem ua haujlwm. Offline programming tuaj yeem txo cov nqi ntawm cov kab ke, tab sis nws tsis yooj yim rau siv thiab debug. Online programming: CPU thiab programmer muaj lawv tus kheej CPUs. Tus tswv tsev CPU yog lub luag haujlwm rau kev tswj xyuas teb thiab sib pauv cov ntaub ntawv nrog tus programmer hauv ib lub voj voog scan. Tus programmer xa cov program online lossis cov ntaub ntawv mus rau tus tswv tsev. Hauv lub voj voog scan tom ntej, tus tswv tsev khiav raws li qhov kev pab cuam tshiab tau txais. Txoj kev no yog kim dua, tab sis lub kaw lus yooj yim rau kev debug thiab khiav lag luam, thiab feem ntau yog siv rau hauv qhov loj thiab nruab nrab qhov programmable logic controllers. Tsib tus qauv programming lus: sequential function chart (SFC), ladder diagram (LD), function block diagram (FBD) peb graphical languages ​​and statement list (IL), structured text (ST) two text languages. Cov lus xaiv programming yuav tsum ua raws li nws tus qauv (IEC6113123), thiab tib lub sijhawm, nws yuav tsum txhawb ntau hom lus programming, xws li C, Basic, thiab lwm yam, kom ua tau raws li cov kev cai tswj hwm tshwj xeeb.