描述
除了上述几种输出电路外,还有双向晶闸管输出电路,它用光电晶闸管实现隔离。双向晶闸管由关断变为导通的延迟时间小于1ms,由导通变为关断的延迟时间小于10ms。晶闸管在负载电流过小时不能导通,遇到这种情况时可以在负载两端并联电阻。
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。
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