Description
若输入端的动合触点闭合,则对应于该输入端子的输入继电器线圈得电,它的动合触点闭合、动断触点断开;当输入端接动断触点且在PLC工作时,若输入端的动断触点未动作,则对应于该输入端的输入继电器线圈得电,它的动合触点闭合、动断触点断开。如果该动断触点与输出继电器线圈串联
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