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Programmable Logic Controller Functionality Timers thiab xa xov

Mar 11, 2019

Kev ua haujlwm tseem ceeb ntawm lub sijhawm ua haujlwm yog kom muaj kev tso zis rau lub sijhawm ntev. Ib qho piv txwv zoo ntawm qhov no yog qhov chaw nres tsheb, qhov uas koj xav kom muab txiav tawm tom qab 2 feeb thiaj li muab sijhawm rau ib tus neeg mus tsev. Peb hom kev siv cov sij hawm uas feem ntau siv tau yog Kev Tso Cai Tawm, Kev Ncua Kev Ncua Sij Hawm, thiab Lub Ncauj Ntej-Lawm. Lub sijhawm ncua sij hawm Tawm Tsam pib thaum pib, muab suav los ntawm ib qho programmed ua ntej txiav tawm, thiab tau muab tshem tawm thaum cov lus qhib kev tawm. Lub sij hawm ncua sij hawm Tawm Tsav Xeeb yog pib los ntawm kev tawm tswv yim thiab pib sau sij hawm, suav txog lub sijhawm ua ntej txiav tawm, thiab raug tshem tawm thaum lub tswv yim qhib kev tawm. Lub sij hawm ncua ntawm-ncua sij hawm-ncua sij hawm yog pib los ntawm kev tawm tswv yim thiab pib lub sij hawm, khaws tus nqi tseem ceeb txawm hais tias (tus lej-logic) rung ploj mus, thiab rov qab pib dua los ntawm ib tus neeg hu ua RESET.


Cov zauv feem ntau yog siv suav cov khoom xws li cov kaus poom mus rau hauv ib lub thawv rau ntawm kab sib dhos. Qhov no yog qhov tseem ceeb vim tias muaj ib yam dab tsi uas tau sau rau nws qhov khoom ntawd yuav tsum tau hloov mus rau lwm yam uas tau muaj. Muaj ntau lub tuam txhab siv cov txee rau hauv PLC los suav cov thawv, suav seb muaj pes tsawg taw ntawm ib yam dab tsi raug them, los yog suav pes tsawg pallets rau ntawm lub tsheb. Muaj peb hom kev txheeb khoom, Nce suav, Tshawb txheeb, thiab Up / Down counters. Txog suav suav txog cov nqi ntawm preset, tig rau ntawm CTU (Taub Tshooj Tawm) thaum pib qhov nqi pib, thiab raug tshem tawm thaum tau txais kev rov pib dua. Cov nram qab suav suav los ntawm tus nqi preset, puv rau ntawm CTD (Cov lus tso tawm hauv qab) thaum 0 raug mus txog, thiab raug tshem tawm thaum pib dua. Txog Up / Down counters suav ntawm CU, suav cov CD, tig rau CTUD (Taub Teem Tshaj / Down tso zis) thaum tus nqi pib ntaus, thiab tshem tawm ntawm kev pib dua.