¥ 价格面议
¥ 价格面议
¥ 价格面议
¥ 价格面议
易卖工控网(www.ymgk.com)提供”0811405073 控制模块”,产品详情:品牌/厂家:其他品牌、型号:811405073、成色:全新、货期:期货 7天内发货、保修:365天,更多产品详情就上易卖工控网。
当PLC运行时,用户程序中有众多的操作需要去执行,但CPU是不能同时去执行多个操作的,它只能按分时操作原理每一时刻执行一个操作。这种分时操作的过程称为CPU对程序的扫描。扫描从0000号存储地址所存放的第一条用户程序开始,在无中断或跳转控制的情况下,按存储地址号递增顺序逐条扫描用户程序,也就是顺序逐条执行用户程序,直到程序结束。每扫描完一次程序就构成一个扫描周期,然后再从头开始扫描,并周而复始。
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