Qhov siab tshaj plaws qhov poob siab tso cai rau ntawm DeviceNet trunk kab yog teev los ntawm DeviceNet specification. Cov lus qhia tshwj xeeb hais tias qhov siab tshaj qhov poob qis yuav tsum tsis pub tshaj tsib feem pua ntawm cov nominal voltage. Piv txwv li, yog hais tias tus nominal voltage ntawm DeviceNet network yog 24 volts, ces qhov siab tshaj plaws voltage poob tso cai rau ntawm lub pob tw kab yog 1.2 volts (24 volts x 5%=1.2 volts).
Tshaj qhov siab tshaj qhov poob siab ntawm DeviceNet lub cev kab tuaj yeem ua rau muaj ntau yam teeb meem, xws li cov ntaub ntawv xa mus tsis raug, ntaus ntawv ua haujlwm tsis zoo, thiab lub sijhawm poob. Yog li ntawd, nws yog ib qho tseem ceeb los xyuas kom meej tias qhov hluav taws xob poob ntawm cov kab hauv lub cev tsis pub dhau qhov kev txwv. Qhov no tuaj yeem ua tiav los ntawm kev ua kom zoo ntawm cov kab hauv lub cev, siv cov kab hluav taws xob zoo, thiab tsis txhob siv cov kab ntau dhau.
Hauv kev xaus, qhov siab tshaj qhov poob siab tso cai rau ntawm DeviceNet lub cev kab yog teev los ntawm DeviceNet specification thiab yuav tsum tsis pub tshaj tsib feem pua ntawm cov nominal voltage. Ua raws li cov lus qhia no ua kom muaj kev ruaj ntseg thiab txhim khu kev qha DeviceNet network nrog lub sijhawm poob qis thiab txo tus nqi kho.
