3BSE003390R1||3BSE003390R1

3BSE003390R1
3BSE003390R1
3BSE003390R1


PLC在RUN工作模式时，执行一次图1-5所示的扫描操作所需的时间称为扫描周期，其典型值约为1～l00ms。扫描周期与用户程序的长短、指令的种类和CPU执行指令的速度有很大的关系。当用户程序较长时，指令执行时间在扫描周期中占相当大的比例。有的编程软件或编程器可以提供扫描周期韵当前值，有的还可以提供扫描周期的大值和小值。


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