系統(tǒng)管理(內(nèi)務(wù))掃描中的系統(tǒng)管理完成開(kāi)始掃描所必需的準(zhǔn)備工作。若PLC為等速掃描模式,掃描將–直延遲到請(qǐng)求掃描時(shí)間消失。若請(qǐng)求時(shí)間早已消失.則OV-SWP%SA0002觸點(diǎn)被置位,而掃描將不延遲。進(jìn)而計(jì)時(shí)器的值(百位、十位和秒位)通過(guò)計(jì)算前–次掃描開(kāi)始與新掃描的時(shí)間差來(lái)更新。為了不失精確性,掃描實(shí)際開(kāi)始是以10014的增量來(lái)記錄的。每個(gè)定時(shí)器都有包含100148增量的殘余量。該殘余量從定時(shí)器增值的最后-次便出現(xiàn)。

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