反向变换线圈-(↓)-如果与该线圈相关的参考地址为OFF,且线圈停止接收电能,则参考地址置ON,直至下次线圈被执行为止。不要从外部设备写人区变换线圈所用的参考地址,因为这将破坏这种线圆的具有的单稳特性。转换线圈可与来自保持或非保持性存贮器(%Q,%M,%G,%T,%SA,%SB或%SC)的地址共用。示例:在下例中,当参考地址E1由OFF转到ON,线圈E2和E3通流,使E2为ON,则有一次逻辑扫描。当E1由ON转到OFF,电流从E2和E3中消失,使E3为ON,则有一次扫描。
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