描述
按照I/O分配接线图接线。I/O分配接线图如图3所示，图中P0—P3为四个按钮，X0—X3为输入继电器接口，Y0—Y3为输出继电器接口，COM为输入继电器的公共端，在内部已接电源负极，COM1为输出继电器分区的公共端，应接24V直流电源的正极。千万注意不能将COM和COM1连接在一起，否则，将造成电源短路，烧坏保险丝。因本实验台本身没有提供电铃，所以电铃在图中未画出，实际应用时可用相应的输出接继电器再控制电铃。
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