The cycle time(CycleTime)refers to the time required for the operating system to perform a cycle operation as shown in the figure,and the cycle time is also called the scan cycle time(ScanCycleTime)or the scan cycle.The cycle time has a great relationship with the length of the user program,the type of the instruction and the speed of the CPU executing the instruction.When the user program is long,the instruction execution time accounts for a considerable proportion of the cycle time.When the PLC is in run mode,the maximum cycle time,the minimum cycle time and the last cycle time can be obtained from the module information dialog of the CPU or the local variables of OB1.
循环时间(CycleTime)是指操作系统执行一次如图所示的循环操作所需的时间，循环时间又称为扫描循环时间(ScanCycleTime)或扫描周期。循环时间与用户程序的长短、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，指令执行时间在循环时间中占相当大的比例。在PLC处于运行模式时，可以从CPU的模块信息对话框或OB1的局部变量获得最大循环时间、最小循环时间和上一次的循环时间。
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