下面的这两个程序为什么用sm0.1实现不了sm0.5脉冲输出


LD I0.0
= Q0.2
LD Q0.2
EU
S M2.3, 1
LD M2.3
MOVW +500, VW20
TON T33, VW20
A T33
R M2.3, 1
MOVW +0, T33
LD M2.3
A SM0.5
= Q0.5
END
***********************

LD sm0.1
= Q0.2
LD Q0.2
EU
S M2.3, 1
LD M2.3
MOVW +500, VW20
TON T33, VW20
A T33
R M2.3, 1
MOVW +0, T33
LD M2.3
A SM0.5
= Q0.5
END