IC697ACC720-+-+-IC697ACC720

-+-+-

R端由0变为1时，T4被复位并停止计时。复位后Q4.5变为0，当前时间和计时预置值均清0。
        定时器指令还有简化形式。

       例：用S7-300控制指示灯HL1，当控制按钮SB1按下时，HL1以2s熄灭、1s亮交替闪烁。设计相应的PLC程序。 
        解：①分配控制系统编程元件：按钮SB1—I0.0；指示灯HL1—Q4.0；延时通定时器T1—计时预置值为1s；延时通定时器T2—计时预置值为2s。 

②采用延时通定时器简化指令，其梯形图和语句指令程序见图。

UNITED SCIENCES 601-0400-02

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