We most often come across a three-way traffic jam in our city. This PLC program gives the solution to control heavy traffic jams using programmable logic control.
This is a Latching rung to operate the system through Master Start and Stop PB.
Starting the timer to turn ON first output West Green so east and west should be in red.
Comparators in Parallel rung are used to turn OFF East red after 15 sec. Timer T4:2 timing bit in parallel contact used to turn ON East red again in 5th and 6Th Step. (Refer Above Tabular column for clarification)
Turning ON North Red up to 3rd step using T4:0 and T4:1’s timer timing bit and comparator blocks.
Turn ON East yellow for 5 sec using comparator blocks. (Step 2nd)
The same procedures followed to turn ON further outputs. ( Refer Tabular column for a sequence of operation)
Reset coil is turned ON using T4:2 ‘s done bit to restart the cycle from beginning
The program runs continuously until STOP PB is pressed
The above-explained 3 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 comparator block function in AB PLC.
If you liked this article, then please subscribe to our YouTube Channel for PLC and SCADA video tutorials.
You can also follow us on Facebook and Twitter to receive daily updates.
Read Next:
The conveyor sorting machine is widely used in the packing industries using the PLC program…
Learn the example of flip-flop PLC program for lamps application using the ladder logic to…
In this article, you will learn the STAR DELTA programming using PLC controller to start…
Lube oil consoles of rotary equipment packages in industrial process plants are usually equipped with…
Rotating equipment packages such as pumps, compressors, turbines need the lube oil consoles for their…
This article explains how to blink lights in ladder logic with a detailed explanation video…
View Comments
If it is possible and ok with you, can you get back the pdf downloading for your articles?
I loved the explanation and the graphic, it helped me.