Basic of PLC

LADDER Practical Exercises – Lesson2

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Continue with the practice series on the Ladder language .

>>> You can see Lesson1 : Views Here

Today I continue to share to you the next 5 exercises

  • Practical Exercises 6 : 3 Conveyor Control

# 3 conveyor system works with the following sequence :

+ When the S1 button M1 conveyor button is pressed, the M2 and M3 conveyors operate after 5 seconds, respectively

+ When press button S2, M3 conveyor stops, M2 and M1 conveyors stop after 5 seconds

+ Operation process is described according to the following time scheme

# Motivation diagram

# Devices used in the circuit include :

+ 1 Aptomat

+ 1 Start button S1

+ 1 Stop button S2

+ 3 Thermal overload relay

# The table specifies the address

# PLC program

+ Network1

+ Network2

+ Network3

# Video simulation program

  • Practical Exercises 7 : Control the sequence of lights to operate sequentially

1 The sequence of 5 lights operates on the following principles :

+ Turn off the system with the S1 button, turn off the system with the S2 button, switch Automatic / Manual mode (A/M) with the S3 button

+ Auto Mode : When the Up button is pressed, the lights turn on from lights 1 to 5 and then stop. When pressing the Down button, the lights turn off from lamp 5 to lamp 1 respectively. The distance between the lights is 1 second

+ Manual Mode : Every time you press Up, there will be 1 light, every time you press Down, there will be 1 light off

# Diagram of a row of lights

# The table specifies the address

# PLC program

+ Network1

+ Network2

+ Network3

+ Network4

# Video simulation program

  • Practical Exercises 8 : Control the product packaging line

A packaging line of 10 products for a container of 1 M1 conveyor, 1 S4 sensor for product counting. Operate according to the following principle

+ Press the S1 button to convey the product transport operation into the box. S4 sensor counts all 10 conveyor products will stop and operate again after 5 seconds

+ Press S2 button conveyor stops after packing enough 10 products into the box

+ Press the S3 button and the system stops immediately and only works again when the S1 button is pressed

# Simulation diagram

# The table specifies the address

# PLC program

+ Network1

+ Network2

+ Network3

+ Network4

# Video simulation program

  • Practical Exercises 9 : Control traffic lights with pedestrians crossing the road

In normal state, the Green-Car and Red-Walk lights are always on . When pedestrians press the button, go to the car, the green light continues to light for 15 seconds, then turn on the yellow light 3 seconds and then the red light 14 seconds. Along with that, after pressing the way button, the green light for pedestrians lights after 20 seconds for 10 seconds

+ The process is described with the following timeline :

# The table specifies the address

# PLC program

+ Network1

+ Network2

+ Network3

+ Network4

# Video simulation program

  • Practical Exercises 10 : Control traffic lights at the intersection

The traffic light system operates at the crossroads according to the following principles :

+ Press button S1 system operation, press button S2 system stops

+ The indicator lights operate according to the time scheme as shown below

# The table specifies the address

# PLC program

+ Network1

+ Network2

+ Network3

+ Network4

# Video simulation program

Thanks for reading .

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