详细介绍
EPRO PR9376/010-021 传感器
EPRO PR9376/010-021 传感器
PLC接收外部输入的开关量信号的窗口。PLC通过光耦合器,将外部信号的状态读入并存储在输入映像寄存器中。输入端可以外接常开触点或常闭触点,也可以接多个触点组成的串并联电路或电子传感器(如接近开关)。在梯形图中,可以多次使用输入继电器的常开触点和常闭触点。 X0端子外接的输入电路接通时,它对应的输入映像寄存器为1状态,断开时为0状态。输入继电器的状态惟一地取决于外部输入信号的状态,不可能受用户程序的控制,因此在梯形图中不能出现输入继电器的线圈。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。
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