Ladder Diagram of Time Control of a Traffic Signal (using RS Logix 500)

Operation:

When On push button is pressed, the process is started
1st red light is lit for 10 sec
Then yellow light is lit for 5 sec.
Then green light is lit for 10 sec.
And then process is repeated from step 1.

Working:

When On push button is pressed, red light is lit and On timer 1 starts for 10 sec. Holding contact keeps red light and timer ON. If we don't use holding contact then red light and timer keep ON until  On push button is pressed. When timer completes its 10 sec, its normally open link closes and its normally close link opens. In the same way 1st 3 rungs work. Then normally open link of On timer 2 resets all the timers and process starts again. This cyclic process remains On forever until the Off push button is pressed.

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PLC based Automatic Filling of Large and Small Size Bottles (Bachelor Level Project)

Start push button = I:0.0/0

Stop push button = I:0.0/1

Conveyor belt = O:0.0/1

Sensor at small height (S1) = I:0.0/2

Sensor at large height (S2) = I:0.0/3

Valve = O:0.0/2

Working

Start push button creates holding for conveyor belt. Small size bottles activates sensor S1 where as large size bottles activate sensors S1 and S2. When S1 closes its path, a timer of 1 second is activated. This timer stops the conveyor belt and activates another timer for 5 seconds and opens the valve to fill the bottle. When 5 second timer completes its 5 seconds, conveyor belt starts again. When S2 closes its path, a timer of 1 second is activated. This timer stops the conveyor belt and activates another timer for 10 seconds and opens the valve to fill the bottle. When 10 second timer completes its time, conveyor belt starts again. 

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Ladder Diagram of 2 motors running in cyclic order for life time (using RS logix 500)

In rung1, when start push button is pressed and released, it establishes a holding. In rung 2,  holding contact starts timer1 and motor1. When timer1 completes its time, its done contacts changes their positions. Normally close done contact of timer1 opens and motor1 stops. Normally open contact of timer 1 closes and starts timer2 and motor2. When timer2 completes its time, its done contacts changes their positions. Normally close done contact of timer2 opens and motor2 stops. Normally open contact of timer2 closes and resets timer1 and timer2. 

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Ladder Diagram of a motor running for 100 secs (using RS logix 500)

In rung1, when start push button is pressed and released, it establishes a holding. In rung 2,  holding contact starts a timer and a motor. When timer completes its time, its done contact opens and motor stops.

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