Traffic Control using 3 Lights
Exit to the Main Menu and select the Traffic Light simulation.
Using your knowledge of cascading timers, develop a ladder logic program
which will sequence a set of green, amber and red lights in the
following manner:
Sequence of Operation:
- Light O:1/00 (Red) = 12
seconds ON
- Light O:1/02 (Green) = 8
seconds ON
- Light O:1/01 (Amber) = 4
seconds ON
- The sequence now repeats with
Red = ON.
<----------------- Time in Seconds ------------------>
RED |
GREEN |
AMBER |
12 Sec. |
8 Sec. |
4 Sec. |
Traffic Control using 6 Lights
Modify your program so that the 3 lights which represent the other
traffic direction are also controlled.
Red = O:1/00 |
Green = O:1/02 |
Amber = O:1/01 |
Green = O:1/06 |
Amber = O:1/05 |
Red = O:1/04 |
8 Sec. |
4 Sec. |
8 Sec. |
4 Sec. |
Traffic Light Control With Delayed Green
Modify your program so that there is a 1 second period when both
directions will have their RED lights illuminated. Using the timing
diagram below, note that two 1 second periods are required in this
sequence.
Red = O:1/00 |
Green = O:1/02 |
Amber = O:1/01 |
Green =
O:1/06 |
Amber = O:1/05 |
Red = O:1/04 |
8 Sec. |
4 Sec. |
1 |
8 Sec. |
4 Sec. |
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