PLC logic tuaj yeem tsim ua hom lus sib txawv, suav nrog cov lus pom kev ua haujlwm siab. Ib qho ntawm cov lus pom zoo tshaj plaws rau PLC tswj cov laj thawj thiab teeb tsa yog Ladder Logic (LL), uas yog mirrored hauv Ladder Diagrams (LDs).Qhov zoo ntawm Ladder Logic yog tias nws muab qhov pom kev sib cuam tshuam, uas txo qis PLC. programming kev kawm nkhaus. Tsis tas li ntawd, cov qauv ntawm Ladder Logic thiab Ladder Diagrams zoo ib yam li cov relay circuits, uas ua rau lawv yooj yim rau electromechanical thiab industrial engineers to taub thiab siv. Ib yam li ntawd, kev paub nrog cov neeg ua haujlwm bitwise thiab Boolean logic pab nkag siab thiab siv ntaiv logic.
Los ntawm qhov kev xav ntawm qhov programming, ntaiv logic siv cov cim sawv cev los qhia txog kev ua haujlwm zoo. Yog li ntawd, ladder logic cov kev pab cuam muaj batches ntawm lej logic nyob rau hauv lub cim txoj hauj lwm, piv txwv li, lawv yog raws li nyob rau hauv me ntsis logic kev khiav hauj lwm thiab yog cov qauv zoo ib yam li cov ntaiv daim duab. Qhov no yog vim li cas thiab qhov laj thawj tom qab lub npe "ladder logic". Qhov no ua rau nws ua hom lus programming. Txawm li cas los xij, ntaiv logic tsis tau tsim rau cov neeg ua haujlwm ib txwm ua ntawm cov lus programming siab. Hloov chaw, nws tau tsim tshwj xeeb rau cov kws tshaj lij, hluav taws xob thiab cov kws tsim hluav taws xob paub txog cov teeb liab hluav taws xob. Yog li ntawd, cov cim ntaiv zoo li cov teeb liab hluav taws xob xws li kev sib cuag thiab cov relays. Cov cim no qhia txog Boolean thiab cov cim logic nyob rau hauv cov ntsiab lus ntawm ib tug ntaiv logic program.
Ladder logic yog PLC programming lus nrov tshaj plaws, tab sis nws tsis yog tib txoj hauv kev los pab PLCs. Lwm yam lus nrov muaj xws li Sequential Function Chart (SFC), Function Block Diagram (FBD), Structured Text (ST), thiab Instruction List (IL). Cov lus no muaj lub tswv yim thiab kev sib txuas lus zoo sib xws rau cov ntaiv logic, nrog rau txoj kev kawm zoo rau cov engineers thiab cov kws tshaj lij paub txog cov tswv yim hluav taws xob.
