上述指令输入PLC编程器运行。
助记符语言
LD X400
ANI T454
OUT T450
K 25
LD T450
OUT T454
K 30
LD X400
ANI T450
OUT T456
K 20
LD T457
OUT T550
K 22
OUT T457
K 3
LD T457
OUT T455
K 2
LD T450
OUT T451
K 25
LD T451
OUT T551
K 27
OUT T452
K 3
LD T452
OUT T453
K 2
LDI T450
AND X400
OUT Y432
LD T450
OUT Y435
LD Y532
ANI T456
LD T456
ANI T457
AND T652
OUT Y433
LD Y432
ANI T456
LD T456
ANI T457
OUT T552
K 1
LD T552
ANI T550
OUT Y437
LD T457
ANI T455
OUT Y434
LD Y435
ANI T451
LD T451
ANI T452
AND T652
OUT Y430
LD Y435
ANI Y451
LD T451
ANI T452
OUT 553
K 1
LD T553
ANI T551
OUT Y436
LD 452
ANI T453
OUT Y431
LD X400
ANI T563
OUT T652
K 0.5
LD T652
OUT T653
K 0.5
END
本文小结
用PLC控制交通信号灯要充分利用其特点：1、高可靠性2、丰富的I／O接口模块3、采用模块化结构4、编程简单易学5、安装简单，维修方便。本例在设计的过程中主要的难点、重点是编程思路.
