PanelView Standard Terminal
2711-K10C8
2711-K10C8
I/O外部电源是指用于PLC源输入模块、PLC输出模块、输入传感器(如接近开关等)、输出执行元件的电源。
用于PLC输入信号的外部电源一般为DC24V。由于输入信号的电压波动可能直接影响到PLC输入状态的变化,故对其要求较高,原则上应采用稳压电源供电;至少应通过三相桥式整流、滤波后进行供电;不能使用仅通过单相桥式整流的直流电源,以防止输入信号采样的错误。
用于PLC输出信号的外部电源与PLC的输出形式与负载要求有关,可以是交流,也可以是直流。特别在当采用继电器接点输出时,电源要求完全取决于负载。
通常情况下,PLC对输出电源的要求要低于输入电源。如:对于直流24V中间继电器、电磁阀
类负载,一般可以使用单相桥式整流的直流电源,但是,当PLC的输出需要作为系统其他控制装置:如CNC等)的输入时,必须根据后者的要求选择输出电源。
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