1747-L531

1747-L531

1747-L531

（二）开关量I/O

    开关量I/O接口可从传感器和开关（如按钮、限位开关等）及控制设备（如指示灯、报警器、电动机起动器等）接收信号。典型的交流输入/输出信号为24～240V，直流输入/输出信号为5～240V。尽管输入电路因制造厂家不同而不同，但有些特性是相同的，如用于消除错误信号的抖动电路等。此外，大多数输入电路在高压电源输入和接口电路的控制逻辑部分之间都设有可选的隔离电路。在评估离散输出时，应考虑熔丝、瞬时浪涌保护和电源与逻辑电路间的隔离电路。熔丝电路也许在开始时花费较多，但可能比在外部安装熔丝耗资要少。

    （三）模拟量I/O

    模拟量输入/输出接口一般用来感知传感器产生的信号。这些接口可用于测量流量、温度和压力，并可用于控制电压或电流输出设备。这些接口的典型量程为-10～+10V、0～+11V、4～20mA或10～50mA。一些制造厂家在PLC上设计有特殊模拟接口，因而可接收低电平信号，如RTD、热电偶等。一般来说，这类接口模块可用于接收同一模块上不同类型的热电偶或RTD混合信号。

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