Qhov zoo: Lub relay tso zis tuaj yeem dhau AC thiab DC, feem ntau ntab hauv qab AC250V / 500V, thiab cov khoom thauj tam sim no tuaj yeem ncav cuag 2A. Yog li ntawd, cov zis ntawm PLC feem ntau tsis haum rau kev tsav tsheb ncaj qha rau cov khoom thauj tam sim no.
Disadvantage: Relays muaj lub neej ntev. Siemens PLC tus neeg saib xyuas lub cim xeeb yog ib qho khoom siv hluav taws xob nrog lub cim xeeb, nws txoj haujlwm yog khaws cov kev pabcuam, cov neeg siv cov kev pabcuam, cov ntaub ntawv sib txawv thiab lwm yam ntaub ntawv. Ntawm lawv, qhov kev zov me nyuam yog qhov kev pab cuam uas tswj PLC kom paub txog ntau yam haujlwm. Nws yog sau los ntawm PLC cov chaw tsim khoom thiab ua kom ruaj khov rau hauv lub cim xeeb nyeem nkaus xwb, uas tsis tuaj yeem nkag los ntawm tus neeg siv. Tsis tas li ntawd, lub sij hawm teb ntawm relay tso zis kuj qeeb, yog li nws tsis tsim nyog siv sub-type circuit output form nyob rau hauv rooj plaub uas yuav tsum tau teb ceev.
