Kev nce qib tsis nyob twj ywm. Yog li ntawd, muaj ntau thiab ntau yam tshiab. Ib txhia ntawm lawv yog cov kev hloov kho tseem ceeb ntawm cov khoom siv yav dhau los. Cov no suav nrog programmable controllers. Lawv yog dab tsi thiab lawv siv qhov twg?
Dab tsi yog hu ua programmable controller
Qhov no yog lub npe ntawm microprocessor ntaus ntawv uas sau, hloov pauv, txheej txheem thiab khaws cov ntaub ntawv. Raws li nws, nws tuaj yeem xa cov lus tswj hwm. Lub cev, cov cuab yeej no tsuas yog txwv los ntawm tus naj npawb ntawm cov khoom siv thiab cov khoom tawm. Sensors, yuam sij, actuators txuas nrog lawv. Programmable controllers yog tsim los ua haujlwm hauv lub sijhawm. Lawv tsim li cas?
Nws pib ua li cas
Kev lag luam automation pib nrog kev sib cuag-relay circuits uas tswj cov txheej txheem tsis tu ncua. Lawv muaj lub logic ruaj khov ntawm kev ua haujlwm, thiab thaum lub algorithm hloov, txhua yam yuav tsum tau rov ua dua. Tab sis dhau sij hawm, qhov tsis yooj yim ua rau kev txhim kho me ntsis hauv kev tsim thiab cov txheej txheem logic tswj tau tshwm sim.
Txoj Cai Ua Haujlwm
Lub hauv paus ntawm lawv yog dab tsiua haujlwm? Nws yuav tsum tau muab sau tseg tias programmable controllers txawv heev ntawm lwm yam microprocessor li. Yog li, qhov kev zov me nyuam muaj ob ntu:
- System software. Qhov no yog ib hom kev khiav hauj lwm uas tswj kev ua haujlwm ntawm cov nodes, txuas cov khoom sib txuas thiab ua kev kuaj mob sab hauv.
- Qhov software uas tswj hwm thiab ua txhua yam haujlwm. Yog li, nws yog lub luag haujlwm rau kev pov npav tawm tswv yim, ua tiav cov neeg siv kev pab cuam, teeb tsa cov txiaj ntsig tsim tawm, nrog rau qee qhov haujlwm pabcuam (visualization, npaj xa cov ntaub ntawv mus rau qhov debugger).
Lub sijhawm teb rau txhua qhov xwm txheej yog nyob ntawm lub sijhawm nws yuav siv los ua ib daim ntawv thov kev pabcuam. Cov khoom xyaw muaj zog dua yog siv, qhov me me yuav yog.
PLC teb
Freely programmable controllers muaj lub cim xeeb nyob ntawm keeb kwm ntawm cov xwm txheej. Thiab raws li qhov tau tshwm sim lawm, lawv yuav hnov qhov txawv ntawm qhov tau tshwm sim tam sim no. Programmable controllers txawv ntawm kev sib xyaw ua ke automata yooj yim uas lawv tuaj yeem tswj tau raws sijhawm, tau tsim cov peev txheej suav thiab tuaj yeem ua cov teeb liab ua tiav.
Nkag thiab tawm
Lawv tuaj nyob rau hauv peb hom: analog, discrete thiab tshwj xeeb. Hauv thawj hom, cov teeb liab hluav taws xob qhia txog qhov muaj qee yam ntawm lub cev ntawm lub sijhawm tam sim no, uasua nrog tam sim no lossis voltage theem. Yog li, lawv tuaj yeem xa cov ntaub ntawv hais txog qhov kub thiab txias, qhov hnyav, txoj haujlwm, siab, zaus, ceev thiab lwm yam ntaub ntawv zoo sib xws. Yuav luag ib txwm lawv yog multichannel. Cov khoom siv digital tuaj yeem ua haujlwm nrog ib lub teeb liab hluav taws xob binary. Nws tuaj yeem piav qhia los ntawm ob lub xeev - tawm lossis qhib. Cov tswv yim digital feem ntau yog qhov loj los lees txais cov qauv teeb liab uas muaj DC tam sim no theem ntawm kwv yees li 10mA ntawm 24V. Muab qhov tseeb tias programmable controllers yog cov khoos phis tawj digital, nws yog qhov tsim nyog los ua kom tsim nyog hloov pauv. Qhov tshwm sim yog qhov sib txawv ntawm qhov sib txawv nrog qee qhov me ntsis. Raws li txoj cai, 8-12 daim yog siv rau hauv ib lub cuab yeej. Txhawm rau tswj hwm qhov siab feem ntau cov txheej txheem thev naus laus zis, qhov no txaus. Tsis tas li ntawd, nrog kev nce hauv qhov tob me ntsis, qhov kev cuam tshuam ntawm kev lag luam nce, uas cuam tshuam tsis zoo rau kev ua haujlwm ntawm lwm yam khoom siv.
