1783-BMS20CGN

1783-BMS20CGN

1783-BMS20CGN 输入电路的作用是将输入控制信号送入PLC，输入设备为按钮SB1、SB2及FR常闭触头。外部输入的控制信号经PLC输入到对应的一个输入继电器，输入继电器可提供任意多个常开触头和常闭触头，供PLC内容控制电路编程使用。

输出电路

输出电路的作用是将PLC的输出控制信号转换为能够驱动KM线圈和HL1指示灯的信号。PLC内部控制电路中有许多输出继电器，每个输出继电器除了 PLC内部控制电路提供编程用的常开触头和常闭触头外，还为输出电路提供一个常开触头与输出端口相连，该触头称为内部硬触头，是一个内部物理常开触头。通过该触头驱动外部的KM线圈和HL1指示灯等负载，而KM线圈再通过主电路中KM主触头去控制电动机M的起动与停止。驱动负载的电源由外电部电源提供，PLC的输出端口中还有输出电源用的COM公共端。

1783-BMS20CGN

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