SPNIS21

SPNIS21

SPNIS21

因为PLC只是在每一扫描周期开始时读取输入信号，输入信号为ON或OFF的持续时间应大于PLC的扫描周期。如果不满足这一条件，可能会丢失输入信号。

 2. 输出继电器(Y)

 输出继电器是PLC向外部负载发送信号的窗口。输出继电器用来将PLc的输出信号传

送给输出模块，再由后者驱动外部负载。如果图3-6梯形图中Y4的线圈“通电”，继电器型输出模块中对应的硬件继电器的常开触点闭合，使外部负载工作。输出模块中的每一个硬件继电器仅有一对常开触点，但是在梯形图中，每一个输出继电器的常开触点和常闭触点都可以多次使用。

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