We most often come across four way traffic jam in our city. This PLC ladder logic gives the solution to control city traffic using programmable logic control.
S.no | Address | Name | Input/Output |
1 | I:0/0 | Start | Input |
2 | I:0/1 | Stop | Input |
3 | B3.0 | Memory | Memory |
4 | O:0/0 | East Green | Output |
5 | O:0/1 | North Red | Output |
6 | O:0/2 | West Red | Output |
7 | O:0/3 | South Yellow | Output |
8 | O:0/4 | East Yellow | Output |
9 | O:0/5 | North Yellow | Output |
10 | O:0/6 | North Green | Output |
11 | O:0/7 | East Red | Output |
12 | O:0/8 | West Yellow | Output |
13 | O:0/9 | West Green | Output |
14 | O:0/10 | South Yellow | Output |
15 | O:0/11 | South Green | Output |
Below tabular column gives the Steps or sequence of outputs to turn ON the traffic system lamps (RED, GREEN, YELLOW)
Latching rung to operate the system through Master Start and Stop PB.
Starting the timer to turn on output East Green ,North-South-West are in red. Parallel circuits are added to turn ON/OFF the output in up next sequence.
Turning on North Yellow and East Yellow. Parallel circuits are added to turn ON/OFF the output in up next sequence.
Turn on East Red and North Green.
Same procedures followed to turn on further outputs.( Refer Above Tabular column for sequence of operation)
Timer (T4:7) done bit is used to restart the cycle from beginning
Program runs continuously until STOP PB is pressed
Time delay of 10s has given using timers.
Note: We can reduce the number of timers using comparator block
The above explained 4 ways traffic light control using PLC is for example only. It may vary from real time. We can use this example program to understand the working of timers and Interlocking function in AB PLC.
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View Comments
IS IT POSSIBLE TO DO THIS WITH JUST ONE TIMER
Can you combine North/South, East/West instructions for neatness and simplicity?