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以东西南北红绿灯为例

其实比较简单，不多说了，就是使用PLC S7-200的顺控指令并行分支，一个分支执行东西红绿灯，另一个执行南北，最后汇总转移。
为什么说是伪多线程？
因为最后需要汇总转移，两个分支在最后具有一定耦合性，并不能说完全相互独立。

控制大意如下

查看详细图片

红绿灯闪烁部分可以看看

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TITLE=PROGRAM COMMENTS
Network 1 // Network Title
// Network Comment
LD     I0.0
S      S0.0, 1
Network 2 
LD     I0.0
O      M0.0
AN     I0.1
=      M0.0
Network 3 
LSCR   S0.0
Network 4 
LD     M0.0
SCRT   S0.1
SCRT   S0.2
Network 5 
SCRE
Network 6 
LSCR   S0.1
Network 7 
LD     SM0.0
TON    T37, 250
Network 8 
LDN    T37
=      M0.3
Network 9 
LD     T37
SCRT   S0.3   
Network 10 
SCRE
Network 11 
LSCR   S0.3   //闪烁部分
Network 12 
LD     SM0.0
TON    T38, 30
Network 13 
LD     M0.0
AN     T39
TON    T40, 5
Network 14 
LD     T40
TON    T39, 5
Network 15 
LD     T40
AN     T38
=      M0.1
Network 16 
LD     T38
SCRT   S0.4
Network 17 
SCRE
Network 18 
LSCR   S0.4
Network 19 
LD     SM0.0
TON    T41, 20
Network 20 
LDN    T41
=      Q0.1
Network 21 
LD     T41
TON    T42, 300
Network 22 
LDN    T42
=      Q0.2
Network 23 
SCRE
Network 24 
// 南北信号灯
LSCR   S0.2
Network 25 
LD     M0.0
TON    T43, 300
Network 26 
LDN    T43
=      Q0.5
Network 27 
LD     T43
SCRT   S0.5

Network 28 
SCRE
Network 29 
LSCR   S0.5
Network 30 
LD     M0.0
TON    T44, 250
Network 31 
LDN    T44
=      M0.2
Network 32 
LD     T44
SCRT   S0.6
Network 33 
SCRE
Network 34 
LSCR   S0.6

Network 35 
LD     SM0.0
TON    T45, 30

Network 36 
LD     M0.0
AN     T46
TON    T47, 5

Network 37 
LD     T47
TON    T46, 5

Network 38 
LD     T47
AN     T45
=      M0.4

Network 39 
LD     T45
SCRT   S0.7

Network 40 
SCRE
Network 41 
LSCR   S0.7

Network 42 
LD     SM0.0
TON    T47, 20

Network 43 
LDN    T47
=      Q0.4

Network 44 
SCRE
Network 45 


LD     S0.7
A      S0.4
AN     I0.1
R      S0.7, 1
R      S0.4, 1
S      S0.0, 1
Network 46 
LD     M0.3
O      M0.1
=      Q0.0
Network 47 

LD     M0.2
O      M0.4
=      Q0.3

当然也在github上开源的，直接下载下来，看梯形图更方便。