每当它们用作非保持线圈时,%Q和%M总是非记忆的，也就是说,随者PLC从STOP转为RUN,或电源接通而被清除,非保持线圈包括:线圈-()-求反线圈-(/)-、暨位线圈-(S)-和复位线圈-(R)-。当%Q或%M参考地址被用作保持线圈或用作功能模块输出时,在断电和启动-停止-启动的转换过程,内容仍被保存,保持线圈包括:保持线圈-(M)-,求反保持线圈-(/M)-,保持置位线圈-(SM)-,保持复位线圈-(RM)-。

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