描述
本指令使用的操作数有:01000~01915、20000~25515、HR0000~HR1915,其功能相当于锁存器,当置位端(S端)条件为ON时,KEEP继电器一直保持ON状态,即使S端条件变为OFF,KEEP继电器也还保持ON,,直到复位端(R端)条件为ON时,才使之变OFF,KEEP指令主要用于线圈的保持,即继电器的自锁电路可用KEEP指令实现。若SET端和RES端同时为ON,则KEEP继电器优先变为OFF。锁存继电器指令编写必须按置位行(S端),复位行(R端)和KEEP继电器的顺序来编写。
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