Cov txheej txheem ua haujlwm ntawm Programmable Logic Controllers (PLCs)

 

Nyob rau hauv lub realm ntawm industrial automation, Programmable Logic Controllers (PLCs) yog cov tseem ceeb tswj units uas orchestrate lub seamless lag luam ntawm ntau lawm kab, machinery, thiab complex systems. Cov txheej txheem kev ua haujlwm ntawm PLC yog ib qho kev sib tw thiab cov txheej txheem zoo heev, tsim los xyuas kom meej - lub sij hawm teb, raug, thiab kev ntseeg siab nyob rau hauv ib puag ncig hnyav. Lub hauv paus ntawm kev tswj hwm qhov kev ua tau zoo ib yam yog qhov zoo ntawmautomation qhov chaw-los ntawm kev tawm tswv yim / tso tawm (I / O) modules mus rau hauv nruab nrab kev ua haujlwm (CPU) cov khoom, txhua qhov khoom seem ua lub luag haujlwm tseem ceeb hauv kev txhawb nqa PLC kev ua haujlwm ruaj khov.

Cov txheej txheem kev ua haujlwm PLC raug nthuav tawm hauv plaub theem ua ntu zus, uas rov ua tsis tu ncua thaum lub kaw lus tau siv rau: pib, kev coj ua piv txwv, kev ua tiav, thiab cov khoom tso tawm tshiab. Cov theem pib pib pib tam sim tom qab PLC qhib lossis rov pib dua. Thaum lub sij hawm no, CPU ua tus kheej - kuaj xyuas kev ua haujlwm ntawm cov khoom siv sab hauv, xws li kev nco thiab kev sib txuas lus modules. Nws kuj tseem pib sau npe sab hauv, timers, thiab counters rau lawv cov nqi qub. Yog tias pom muaj teeb meem kho vajtse, PLC ua rau lub tswb nrov thiab nres kev ua haujlwm ib txwm muaj, qhia txog qhov teeb meem me me hauv cov khoom siv automation tuaj yeem cuam tshuam tag nrho cov kev tswj xyuas.

Tom qab pib qhov pib, PLC nkag mus rau theem kev coj ua piv txwv. Nyob rau theem no, CPU scans tag nrho cov input terminals nyob rau hauv ib qho kev txiav txim ua ntej, sau cov teeb liab los ntawm teb cov cuab yeej xws li sensors, laub khawm, thiab txwv keyboards. Cov teeb liab analog lossis digital no tau hloov pauv mus rau hauv cov ntaub ntawv binary (0s thiab 1s) thiab khaws cia rau hauv daim ntawv sau npe nkag - thaj chaw nco tshwj xeeb uas ua raws li cov duab ntawm cov xwm txheej hauv lub sijhawm ntawd. Qhov tseem ceeb, txhua qhov kev hloov pauv ntawm cov tswv yim tawm tswv yim nyob rau theem tom ntej yuav tsis muaj txiaj ntsig kom txog rau thaum lub sijhawm ua piv txwv tom ntej, kom ntseeg tau tias qhov kev ua tiav yog raws li cov ntaub ntawv ruaj khov. Lub durability ntawm cov tswv yim modules, ib pawg tseem ceeb ntawm automation qhov chaw, ncaj qha cuam tshuam qhov tseeb ntawm cov teeb liab sau, tshwj xeeb tshaj yog nyob rau hauv ib puag ncig uas muaj kev cuam tshuam electromagnetic siab.

Tom ntej no los txog theem kev ua tiav, qhov tseem ceeb ntawm PLC txoj haujlwm. CPU ua haujlwm rau tus neeg siv- sau cov kev tswj hwm kab los ntawm kab, tom qab sab saum toj - mus rau - hauv qab thiab sab laug - mus rau - txoj cai ib ntus. Nws khaws cov ntaub ntawv los ntawm cov ntawv sau npe nkag thiab lub cim xeeb hauv lub cim xeeb, ua haujlwm zoo (xws li THIAB, LOSSIS, TSIS), kev suav lej, thiab sijhawm / suav ua haujlwm raws li tau teev tseg hauv qhov program. Cov txiaj ntsig ntawm cov haujlwm no tau muab khaws cia ib ntus hauv cov ntawv tso tawm cov duab tso tawm, tsis yog raug xa ncaj qha mus rau qhov tso zis terminals. Qhov kev ua kom raug cais tawm no tiv thaiv kev cuam tshuam sab nraud los ntawm kev cuam tshuam rau kev ua haujlwm logic, lav qhov tseeb ntawm kev tswj xyuas kev txiav txim siab. Qhov kev ua tau zoo ntawm theem no yog ze rau qhov ua tau zoo ntawm CPU chips thiab lub cim xeeb modules, qhov tseem ceeb automation uas txiav txim siab PLC cov lus teb ceev thiab kev ua haujlwm muaj peev xwm.

Qhov kawg theem yog tso zis refresh. Tom qab ua tiav qhov kev ua tiav, CPU hloov pauv cov ntaub ntawv khaws cia hauv cov duab tso zis tso npe rau cov zis terminals hauv ntu. Cov teeb liab no tau hloov mus rau hauv cov lus txib ua tau zoo rau cov actuators, xws li lub cev muaj zog, solenoid li qub, thiab cov teeb pom kev zoo, tsav cov cuab yeej siv los ua cov haujlwm tsim. Thaum cov khoom tso tawm tshiab tiav lawm, PLC tam sim ntawd rov qab mus rau theem kev tawm tswv yim, pib lub voj voog tshiab. Lub voj nruam txuas ntxiv no ua kom ntseeg tau tias PLC tuaj yeem hloov kho kom hloov pauv hauv cov txheej txheem kev lag luam, tswj xyuas lub sijhawm tiag tiag -. Kev ntseeg siab ntawm cov zis modules thiab relays, qhov tseem ceeb automation qhov chaw, yog qhov tseem ceeb ntawm no, vim lawv ua tus choj ntawm PLC lub logic sab hauv thiab cov khoom siv sab nraud.

Raws li ib tug kws tshaj lij kev lag luam nrog ntau tshaj kaum xyoo ntawm kev paub hauv kev lag luam automation, Synctime Automation Tech Co., Ltd muaj ib qho - nres kev pab cuam rau automation qhov chaw uas haum rau ntau yam kev xav tau ntawm cov neeg siv khoom thoob ntiaj teb. Tshwj xeeb nyob rau hauv ib tug ntau yam ntawm cov Cheebtsam -los ntawm PLC I/O modules thiab CPU units mus rau sensors thiab relays-lub tuam txhab tau tsim ib tug zoo lub koob npe nrov rau nws zoo ib yam khoom zoo, sib tw nqi, thiab cov kev pab cuam xa khoom zoo.