当使能输出%M0125跳变为ON时,底板通讯窗口模式和定时器值是被读,如果定时器值大于或等于25 ms时,值不会改变如果小于25 ms,值将改变为25 ms。不管那种情况，当梯级完成执行后窗口激活，三个窗口参数块在存储单元%R5051中。在从读窗口值功能(SVC_ REQ 2)送回参数块时，由于底板通讯窗口的模式和计时器是第二个值，底板通讯窗口的现有的窗口时间存储单元在%R5052.的低字节。

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