Question

on plc program(PLC software) (Ladder diagram)basic program on paper is ok if it is drwan on paper i just need an example to understand and do by myself detail answer is much appreciated thank you

Write a short (no more than 2 page) paper on your process and ladder diagram

• choose a simple manufacturing process (i.e. conveyor belt, garage door, filling operation, etc.)

• process must have the following inputs

• A safety factor (such as 2 pushbuttons or a safety sensor) • An emergency stop button • At least one additional sensor (i.e. photo sensor, fill sensor, etc.)

• process must have the following outputs: • At least 1 motor or solenoid • At least 2 indicator lights (pilot lights)

Answer 1

Garage door manufacturing process-

This system has two safety sensors to sense the movement of the shutter of the garage near top and bottom ceiling to avoid hard impact of the shutter.
And an emergency button to stop the movement of the shutter in between. Also, two push buttons to open and close the door if a vehicle comes near the door of the garage.

And the system has two outputs to rotate the motor to close and open the shutter.

Component details of the system for drawing the ladder diagram -

The ladder diagram for the system is as bellow-

Explanation -

At first when the 'open switch' is pressed then the motor up output(I:1/00) will be on. The status of I:1/00 is connected parallelly to 'open switch' to make the output 1 at I:1/00 continuous.

The inputs of Safety button at the top and Stop button is also connected parallelly to 'open switch' to stop the motor.

A similar thing is done in case of 'close switch'.

For indicators to indicate the status of the door the output of the top sensor is taken for indicating closed status and output of the bottom sensor is taken for indicating opened status.