Lub Programmable Logic Controller (PLC) yog lub khoos phis tawj tshwj xeeb rau kev tswj hwm kev lag luam. Vim nws cov rugged kev tsim kho, tshwj xeeb kev ua haujlwm (xws li kev tswj hwm ntu ntu, cov txee thiab lub sijhawm), yooj yim ntawm kev ua haujlwm, kev tswj hwm kev muaj peev xwm, thiab yooj yim ntawm kev siv kho vajtse - PLC tsis yog tsuas yog siv hauv thaj chaw tshwj xeeb hauv kev tswj hwm lub computer hauv kev lag luam thiab lwm yam kev lag luam. Feem ntau cov kev lag luam abbreviate cov cuab yeej no ua "PC", tab sis nws kuj yog siv rau tus kheej lub computer; Yog li ntawd, ntau lub tuam txhab tsim cov khoom siv no ua PLCs.
Programmable Logic Controllers yog siv tsis tau tsuas yog rau kev lag luam, tab sis kuj siv rau hauv cov ntawv thov xws li tshuab ntxhua khaub ncaws, kev ua haujlwm of elevator thiab kev tswj cov teeb liab. Muaj ntau ntau hom PLCs muaj nyob rau hauv kev ua lag luam niaj hnub no los ntawm ntau tus neeg tsim khoom, yog li hauv kab lus hauv qab no, cia peb kawm cov hauv paus ntsiab lus, cov hauv paus ntsiab lus thiab kev siv ntawm programmable logic controllers.