FC1编写：

A #Engine_ON
L S5T#4S
SF #Timer_Function
A #Engine_OFF
R #Timer_Function
NOP 0
NOP 0
A #Timer_Function
= #FAN_ON

OB1 调用：

A "SW_ON"
= L 20.0
BLD 103
A "SW_OFF"
= L 20.1
BLD 103
CALL FC 1
Engine_ON :=L20.0
Timer_Function:=T2
Engine_OFF :=L20.1
FAN_ON :=Q0.1

输入到模拟器上模拟，报程序错误，SF灯亮，不能运行，是什么原因呀？