描述
除了输入模块和输出模块，还有一种既有输入电路又有输出电路的模块，输入、输出的点数一般相同，这种模块使用户确定PLC的硬件配置更为方便。
输出电流的额定值与负载的性质有关，例如FX的继电器输出模块可以驱动2A/220VAC的电阻性负载，但是只能驱动80VA／220VAC的电感性负载和100W的白炽灯。额定输出电流还与温度有关，温度升高时额定输出电流减小，有的PLC提供了有关的曲线。
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