Index

PSIM
Traffic Control Lab
Utilizing TON Timers


 

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:

  1. Light O:1/00 (Red) = 12 seconds ON
  2. Light O:1/02 (Green) = 8 seconds ON
  3. Light O:1/01 (Amber) = 4 seconds ON
  4. 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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