IC670MDL640
IC670MDL640
由于外部输入设备和输出设备所需的信号电平是多种多样的,而PLC内部CPU的处理的信息只能是标准电平,所以I/O接口要实现这种转换。I/O接口一般都具有光电隔离和滤波功能,以提高PLC的抗*力。另外,I/O接口上通常还有状态指示,工作状况直观,便于维护。
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