系统管理(内务)扫描中的系统管理完成开始扫描所必需的准备工作。若PLC为等速扫描模式,扫描将–直延迟到请求扫描时间消失。若请求时间早已消失.则OV-SWP%SA0002触点被置位,而扫描将不延迟。进而计时器的值(百位、十位和秒位)通过计算前–次扫描开始与新扫描的时间差来更新。为了不失精确性,扫描实际开始是以10014的增量来记录的。每个定时器都有包含100148增量的残余量。该残余量从定时器增值的最后-次便出现。
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