如果PLC使用继电器输出模块，应在与CD4513相连的PLC各输出端接一个下拉电阻，以避免在输出继电器的触点断开时CD4513的输入端悬空。PLC输出继电器的状态变化时，其触点可能抖动，因此应先送数据输出信号，待该信号稳定后，再用LE信号的上升沿将数据锁存进CD4513。除了PLC输入和输出共用同一电源外，输入公共端与输出公共端一般不能接在一起。

：张亮（工程师）    专线：
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