西门子6SL3353-3AE32-6AA0

6SL3353-3AE32-6AA0

数字量输入信号：数字量输入信号是指只有两个状态的信号，通常表示为0或1，例如开关信号、按钮信号、传感器信号等。数字量输入信号可以直接连接到数字量输入模块，由PLC进行采集和处理。数字量输入信号的处理简单，适用于对外部设备进行二进制控制的场合。

　　模拟量输入信号：模拟量输入信号是指信号大小可以连续变化的信号，例如温度信号、压力信号、流量信号等。模拟量输入信号需要经过模拟量输入模块进行A/D转换，将模拟量信号转换为数字量信号，再由PLC进行采集和处理。模拟量输入信号的处理比较复杂，适用于对外部设备进行精密控制和调节的场合。在实际工业控制中，PLC通常需要处理各种不同类型的数字量和模拟量信号，例如传感器信号、按钮信号、温度信号、压力信号、流量信号、速度信号、位置信号等。根据实际需要选择不同的输入模块进行采集处理，再通过PLC进行逻辑处理和控制输出模块控制外部设备。

　　plc没有输入信号

　　如果PLC没有输入信号，则PLC无法进行控制和调节外部设备。PLC的输入信号通常来自外部设备，例如传感器、按钮、开关等，如果没有这些设备的输入信号，PLC无法采集和处理信号，也就无法控制和调节外部设备。在实际工业控制中，如果PLC没有输入信号，通常需要检查以下几点：

　　检查输入设备是否正常：如果输入设备故障或未连接，则无法采集到信号，PLC也无法进行控制和调节。

　　检查输入模块是否正常：如果输入模块故障或未连接，则无法将信号转换为PLC内部的数字量或模拟量信号，PLC也无法进行采集和处理。

　　检查PLC程序是否正常：如果PLC程序有误或未启动，则无法进行逻辑处理和控制输出模块控制外部设备。如果以上问题都排除了，仍然没有输入信号，则需要进一步检查PLC硬件是否正常，例如电源、CPU、通讯口等。如果无法解决问题，则需要联系PLC厂家或专业维修人员进行修理。

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