西门子PLC交通灯设计

SB1 SB2 1L 1M — 2L GND +24V L1 N 220V

PLC交通灯外部分配及接线图

编制程序

根据上述I/O分配表编制出程序如下：

T38

30 T37 250T38 IN TON PT 100ms T37

IN TON PT 100ms 250s T39 IN TON PT 100ms

200sT39

T40 IN TON PT 100ms T41 IN TON 20 PT 100ms T40 T42 IN TON PT 100ms T43

T37 200

T42 30 T43

IN TON PT 100ms T44 IN TON PT 100ms 20

T37

T37

﹙﹚

﹙﹚

T39

﹙﹚

T40 T40 >=I <=I 1

10

T40

T40

>=I

<=I 20 30 T40

T41

T42

﹙﹚ ﹙﹚

T43 T43 >=I <=I 1 10

T43 >=I T43 20

<=I 30 T43

T44

﹙﹚

指令表如下

LD AN AN T38 TON T37, 250 LD T37 LD T39 TON T40, 30 LD T40 TON T41, 20 LD T37 TON T42, 200 LD T42 TON T43, 30 LD T43 TON T44, 20 LDN T37 AN A = LD T37 = LD AN T39 = LD T40 >=I,I=1 A T40 <=I,I=10 =

TON T38, 250 LDN A A T37 TON T39, 200 LD T40 AN T41 = LD AN T42 =

LD T43 >=I,I=1 A T43 <=I,I=10 =

LD T43 >=I,I=20A T43 <=I,I=30 = LD T43 AN T44 = LD A =

LD A =

T40 >=I,I=20 T40 <=I,I=30