ELSIF #A=2 AND #B=#C THEN
CASE #D OF
11..19:
#H:= 'In->Pause:Button';
#F := -1;
#G:= 6;
#D := 10;
21..29:
#H:= 'OUT->Pause:Button';
#F := -1;
#G:= 6;
#D := 20;
101..109:
#H:= 'In->Pause:Button';
#F := -1;
#G:= 6;
#D := 100;
END_CASE;
END_IF;
这段程序什么意思?特别是 In->Pause:Button 这是什么啊,新手不明白