PLC控制元件，如何开关背景灯
通过PLC控制，可以打开或关闭背光灯，带返回值的是关屏以后LB10变量也复位了。
而不带返回值的，是需要手动复位或置位。
再新建一个位状态显示元件
再新建一个宏让其每3秒执行一次关屏，可以发现带返回值的也跟着复位了。
另一种方式：是添加系统变量LW9080节能时间，单位分钟。
通过PLC控制，可以打开或关闭背光灯，带返回值的是关屏以后LB10变量也复位了。
而不带返回值的，是需要手动复位或置位。
再新建一个位状态显示元件
再新建一个宏让其每3秒执行一次关屏，可以发现带返回值的也跟着复位了。
另一种方式：是添加系统变量LW9080节能时间，单位分钟。
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