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Programmable logic controller Kev hais lus thiab kev loj hlob thaum ntxov

Programmable logic controller Kev hais lus thiab kev loj hlob thaum ntxov

Mar 11, 2019

Nyob rau xyoo 1968 GM Hydramatic (qhov kev sib txuas lus pib tsav tsheb ntawm General Motors) tau xa daim ntawv thov rau kev xa khoom hluav taws xob rau cov xov hluav taws xob raws li ntawv sau los ntawm engineer Edward R. Clark. Lub tswv yim uas tau txais los ntawm Bedford Associates ntawm Bedford, Massachusetts. Tus thawj PLC, tau tso cai rau 084 vim nws yog Bedford Associates qhov kev pabcuam yim caum yim, yog qhov tshwm sim. Bedford Associates tau pib ib lub tuam txhab tshiab rau kev tsim, tsim, muag, thiab pab tu cov khoom tshiab no: Modicon, uas sawv ntawm cov qauv siv digital. Ib tug ntawm cov neeg uas tau ua haujlwm ntawm qhov project ntawd yog Dick Morley, uas yog xav tias yog txiv "tus txiv" ntawm PLC. Lub Nroog Modicon tau muag thaum 1977 mus rau Gould Electronics, tom qab kis ntawm German Company AEG, thiab ces los ntawm Fabkis Schneider Electric, tam sim no tus tswv.


Ib qho ntawm cov ua ntej 084 qauv yog tam sim no rau tso saib ntawm Schneider Electric lub chaw nyob rau hauv North Andover, Massachusetts. Nws tau hais rau Modicon los ntawm GM, thaum chav tsev tau so haujlwm tom qab ze li ntawm nees nkaum xyoo ntawm kev pab cuam. Modicon siv lub 84 moniker ntawm qhov kawg ntawm nws cov khoom ntau txog thaum 984 nws cov tsos.


Qhov kev lag luam tsheb tseem yog ib qho ntawm cov neeg siv coob ntawm PLCs.


Hauv kev loj hlob ntawm txoj kev loj hlob Odo Josef Struger qee lub npe hu ua "leej txiv ntawm tus programable logic xws li" zoo li. Nws tau koom tes rau hauv lub tswv yim ntawm Allen-Bradley cov cuab yeej tswj logic (PLC) thaum xyoo 1958 mus txog rau 1960. Struger yog muab tso nrog tsim cov PLC acronym. [4] Allen-Bradley (tam sim no ib lub npe ntawm Rockwell Automation), cov chaw tsim tshuaj paus ntawm tus maub los, ua ib qho loj programmatic logic tswj qhov chaw tsim hluav taws xob nyob hauv Tebchaws Meskas thaum lub sijhawm ntawm Struger.


Thaum ntxov PLCs tau tsim los hloov cov khoom siv lub tshuab cua. Cov PLCs tau programmed nyob rau hauv "ntaiv logic", uas ntseeg tau tsa ib daim duab ntawm daim phiaj tsom tawm. Qhov kev pab cuam cim no tau raug xaiv los txo cov kev kawm xav tau rau cov kws kho tam sim no. Lwm cov PLC thaum ntxov tau siv ib daim ntawv qhia kev qhia programming, raws li qhov teeb meem ntawm cov teeb meem logic.


Cov PLCs tam sim no muaj peev xwm ua tau rau hauv ntau txoj hau kev, los ntawm cov lag luam relay-derived logic rau cov programming cov lus xws li kev qhia tshwj xeeb uas siv yawm suab ntawm BASIC thiab C. Lwm txoj kev yog xeev logic, hom lus programming ntau heev uas tsim los rau qhov program PLCs raws li xeev hloov duab kos. PLC feem ntau niaj hnub ua raws li IEC 61131/3 tswj cov txheej txheem ntawm cov cuab yeej siv los qhia txog 5 hom lus: Ntaus Daim Duab Qhia (LD), Cov Ntawv Sau Tseg (ST), Cov Kev Ntsuas Kos Duab (FBD), Cov Ntawv Qhia Npe (IL) (SFC).


Ntau lub sijhawm PLCs tsis tau nrog cov programming terminals uas muaj peev xwm sawv cev ntawm cov logic, thiab yog li ntawd cov logic twb txhais sawv cev ntawm cov kab lus ntawm cov zajlus hauv ib co version of Boolean, zoo li Boolean algebra. Raws li programming terminals evolved, nws los ua ntau tshaj rau tus ntaiv logic rau siv, rau cov lus hais vim li cas thiab vim nws yog ib yam uas paub siv rau kev tswj hwm electronically mechanical panels. Cov ntawv tshiab tshiab xws li lub xeev cov cim thiab Lub Nruab Nrab Cov Haujlwm (uas yog zoo li txoj kev logic yog cov duab thaum siv digital integrated logic circuits) nyob ua ke, tab sis lawv tseem tsis yog nrov li ntaiv logic. Qhov laj thawj ntawm qhov no yog qhov PLCs daws cov logic hauv kev ua kom paub tseeb thiab rov ua dua, thiab tus ntaiv cov lus tso cai rau tus programmer (tus neeg sau cov logic) kom pom txhua yam teeb meem nrog lub sij hawm ntawm cov txheej txheem logic yooj yim dua li yuav ua tau rau lwm tawm tswv yim.