Description
输入的灵敏度各厂家对PLC的输人端电压和电流都有规定,如日本三菱公司F7n系列PLC的输入值为:DC24V、7mA,启动电流为4.5mA,关 断电流小于1.5mA,因此,当输入回路串有二极管或电阻(不能完全启动),或者有并联电阻或有漏电流时(不能完全切断),就会有误动作,灵敏度下降,
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