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Programmable logic controller Discrete (digital) thiab analog teeb tsa

Mar 11, 2019

Discrete (digital) cov cwj pwm coj ua raws li cov kev hloov nruab nrab ntawm binary, yielding ib qho On On or Off signal (1 lossis 0, Tseeb lossis Cuav, feem). Laub cov nyees khawm, cov keyboards, thiab qhov muag sensors yog cov piv txwv ntawm cov cuab yeej muab lub teeb liab. Cov qhab-ncaij tawm cais yog xa raws li siv hluav taws xob los sis tam sim no, qhov twg yog qhov kev khom nqi tshwj xeeb raug teev tseg rau hauv thiab lwm yam ua Off. Piv txwv, tus PLC yuav siv 24 V DC I / O, nrog qhov tseem ceeb saum 22V DC sawv cev rau, qhov tseem ceeb tshaj 2VDC tam tshaj tawm, thiab cov nqe lus tsis tshua meej. Pib, PLCs tsuas yog cov I / O.


Analog Pib ntsais koj teeb yog zoo li ntim ntawm lwm yam, nrog ib qhov ntawm qhov tseem ceeb ntawm zero thiab full-scale. Cov no feem ntau txhais raws li cov zauv (integer) (suav) los ntawm PLC, nrog ntau ntau yam ntawm qhov tseeb nyob ntawm tus ntaus ntawv thiab cov khoom tsawg muaj khaws cia cov ntaub ntawv. Raws li PLCs feem ntau siv 16-ntsis kos npe rau binary processors, integer qhov tseem ceeb yog tsawg ntawm -32,768 thiab +32,767. Kev kub siab, kub, ntws, thiab nyhav feem ntau yog cov sawv cev ntawm analog. Analog signals siv tau voltage los yog tam sim no nrog ib qhov sib luag proportional rau tus nqi ntawm cov teeb meem txheej txheem. Piv txwv, ib qho analog 0 mus rau 10 V lossis 4-20 mA tawm tswv yim yuav raug muab hloov mus ua ib qho ntawm integer ntawm 0 rau 32767.


Cov khoom siv tam sim no tsis hnov suab nrov ntawm lub suab nrov (piv txwv li ntawm cov neeg ntim khoom los yog lub tshuab hluav taws xob pib) dua li qhov hluav taws xob nkag.


PLCs yog nyob ntawm lub forefront ntawm kev tsim khoom hluav taws xob. Ib tug engineer ua haujlwm nyob rau hauv ib qho chaw yuav raug tsawg kawg muaj feem xyuam nrog qee cov PLCs, yog tias tsis siv nws ua ntu zus. Cov tub ntxhais kawm ntawv hluav taws xob tsim nyog yuav tsum paub txog PLCs vim lawv txoj siv thoob plaws hauv cov ntawv siv.