Task $5$

Figure $1$: shows a simple conveyor dispatching system ot boxes.

The system works as follows:

Press and release the 'start' Button, the motor will rotate, the conveyor will move to carry the box towards the sensor and the lamp turn a green light while this is going on$.$

When the box on the conveyor is detected by the sensor$,$ the motor stops immediately.

A timer is integrated on the green light to make it flicker every $5$ seconds.

When the fifth $(5)$ box is taken away from the conveyor, the motor stops so that the operator can seal the pack.

If the 'stop' button is pressed, the motor is stopped, and the lamp will turn OFF immediately.

a$.$ Generate the input, output and address table which can be documented.

b$.$ The ladder diagram must be drawn or printed.

c$.$ Explain in detail how the program operates.

d$.$ Write a description of the test procedure used and the justification of the logic elements used to construct the final program.