我写了个大家指导指导！！
i0.0 启动
q0.0 正转
q0.1 反转
q0.2 指示灯

TITLE=程序注释
Network 1
// 初始化1
LD SM0.1
OB= VB0, 60
MOVB 0, VB0
Network 2
// 初始化2
LD I0.0
MOVB 1, VB0
Network 3
// 启动
LD I0.0
LDB= VB0, 60
NOT
A M0.0
OLD
= M0.0
Network 4 // 网络标题
// 计时
LD SM0.5
EU
A M0.0
INCB VB0
Network 5
// 正转
LDB= VB0, 1
OB= VB0, 27
LDB= VB0, 11
OB= VB0, 37
NOT
A M0.1
OLD
= M0.1
= Q0.0
Network 6
// 反转
LDB= VB0, 14
OB= VB0, 40
LDB= VB0, 24
OB= VB0, 50
NOT
A M0.2
OLD
= M0.2
= Q0.1
Network 7
// 反转
LDB= VB0, 50
LDB= VB0, 60
NOT
A M0.3
OLD
= M0.3
= Q0.2