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使用LB9040在宏中向上/向下打开背光。
在宏编辑屏幕中，编写两个背光控制宏。
macro_command main()
bool a=1
short i
for i=0 to 30 step 1
SetData(a,"Local HMI", LB, 9040, 1)
next
end macro_command
macro_command main()
bool a=1
short i
for i=0 to 30 step 1
SetData(a,"Local HMI", LB, 9041, 1)
next
end macro_command