VT3006S35R5

输入(Input)模块和输出(Output)模块简称为I/O模块，开关量输入、开关量输出模块简称为DI模块和DO模块，模拟量输入、模拟量输出模块简称为AI模块和AO模块，它们统称为信号模块。信号模块是系统的眼、耳、手、脚，是联系外部现场设备和CPU模块的桥梁。
输入模块用来接收和采集输入信号，开关量输入模块用来接收从按钮、选择开关、数字拨码开关、限位开关、接近开关、光电开关、压力继电器等来的开关量输入信号。模拟量输入模块用来接收电位器、测速发电机和各种变送器提供的连续变化的模拟量电流、电压信号，或者直接接收热电阻、热电偶提供的温度信号。
开关量输出模块用来控制接触器、电磁阀、电磁铁、指示灯、数字显示装置和报警装置等输出设备，模拟量输出模块用来控制电动调节阀、变频器等执行器。
CPU模块内部的工作电压一般是DC5V，而PLC的外部输入/输出信号电压一般较高，例如DC24V或AC220V。从外部引入的尖峰电压和干扰噪声可能损坏CPU模块中的元器件，或使PLC不能正常工作。在信号模块中，用光耦合器和小型继电器等器件来隔离PLC的内部电路和外部的输入、输出电路。信号模块除了传递信号外，还有电平转换与隔离的作用。 低压断路器的选用，应根据具体使用条件选择使用类别，选择额定工作电压、额定电流、脱扣器整定电流和分励、欠压脱扣器的电压电流等参数，参照产品样本提供的保护特性曲线选用保护特性，并需对短路特性和灵敏系数进行校验。当与另外的断路器或其他保护电器之间有配合要求时，应选用选择型断路器。低压断路器的额定工作电压Ue。和额定电流Ie。应分别不低于线路，设备的正常额定工作电压和工作电流或计算电流。断路器的额定工作电压与通断能力及使用类别有关，同一台断路器产品可以有几个额定工作电压和相对应的通断能力使用类别。 所选断路器的瞬时或短延时脱扣器整定电流Ir2应大于线路尖峰电流。配电断路器可按不低于尖峰电流1.35倍的原则确定，电动机保护电路当动作时间大于0.02s时可按不低于1.35倍起动电流的原则确定，如果动作时间小于0.02s，则应增加为不低于起动电流的1.7—2倍。这些系数是考虑到整定误差和电动机起动电流可能变化等因素而加的。

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Tascam DA-88 Digital Multi-Track Recorder w/ SY-88 Card

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专业销售进口DCS  PLC系统备件模块