智能总线控制器的切换智能总线控制:器当在一-定的时间没有接收到PLC传送的输出数据后会停止对智能设备的输出,这段时间等于两倍的看门狗计时器的设置值。如果首要单元中的CPU在非控制(例如掉电)的情况下无法执行控制
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