Nowadays vending machine demands is increasing to satisfy

customer needs. The objective is to design a fully automatic fresh

orange juice machine using the PLC ladder logic. Basic

information about the design$/$machine are as follows:

The machine only accepts one Omani riyal notes and will

not return any changes.

The machine should return the notes for all cases where

the machine has a problem.

The machine will have the capacity to handle several sizes

of oranges to extract fresh orange juice, but machine

should indicate whenever the machine needs refilling

oranges.

The machine will have orange squeezed waste storage

capacity but needs to indicate when full.

The customer takes the ready glass of pure orange juice

from the allocated slot in the machine when it is ready.

The machine should inform the customer if there is an error in the machine.

This vending machine is simple and small size.

a$)$ Identify tasks required to design fully automatic orange juicer machine

using PLC ladder logic diagram.

b$)$ Identify all possible input and output signals and label $($give proper name or

abbreviation$)$ all of them.

c$)$ Write the ladder logic program for this design.