Mid Sem test 2020 PDF

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RMIT UNIVERSITYSchool of EngineeringEEET2105/EEET2388 Industrial AutomationMid-s emester Test 20 20Instructions1. Write your solution on blank A4 paper sheets, using only one side of the sheet.2. Write your full name and student number on the first sheet.3. Commence each question on a new sheet.4. N...

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RMIT UNIVERSITY School of Engineering

EEET2105/EEET2388 Industrial Automation Mid-semester Test 2020

Instructions 1. Write your solution on blank A4 paper sheets, using only one side of the sheet. 2. Write your full name and student number on the first sheet. 3. Commence each question on a new sheet. 4. Number the sheets. 5. Use blue or black pen. Pencil is not allowed.

Important You must return your solution to the test paper by replying to the email titled EEET2105/EEET2388 Industrial Automation Mid-semester Test no later than 75 minutes after the email arrived at your email inbox. Scan or take photos of your working and send as attachment(s). ∆

RMIT University | School of Engineering | EEET2105/EEET2388 Mid-semester Test 2020

Part 1) Consider the bottle filling process shown in Figure 1. It contains an infeed conveyor motor M1, an outfeed conveyor motor M2, a limit switch LS to detect that a bottle is under the filler, a solenoid valve SV to control the release of fluid, and a proximity sensor to detect when the bottle is full. ENABLE and DISABLE push-buttons are used to enable and disable the process, respectively.

ENABLE

Fluid

Filler Solenoid Valve SV Proximity Sensor PS

DISABLE

Empty Bottles

Filled Bottles

Fixed Rollers

Limit Switch LS

Motor M1

Motor M2 Figure 1

The system elements have the following characteristics: ■ Motor M1 is 240 Vac single-phase AC type, controlled by a dual-pole contactor K1 ■ Motor M2 is 240 Vac single-phase AC type, controlled by a dual-pole contactor K2 ■ Contactor K1 has a 24 Vdc coil and 1 normally-open auxiliary contact ■ Contactor K2 has a 24 Vdc coil and 1 normally-open auxiliary contact ■ Solenoid valve SV is 24 Vdc type, opens when energised, and closes when de-energised ■ Proximity sensor PS is capacitive type and has 1 normally-open contact and 1 normally-closed contact ■ Limit switch LS has 2 normally-open contacts and 1 normally-closed contact ■ The system is fuse protected and the AC supply to each motor is provided via a dual-pole isolator (retentive) ■ ENABLE push-button is normally-open type ■ DISABLE push-button is normally-closed type The following narrative describes the requirements for the system: ■ The process is enabled by pressing the ENABLE push-button, and disabled by pressing the DISABLE push-button ■ Once the process is enabled, outfeed conveyor motor M2 turns on and remains on until the process is disabled ■ Infeed conveyor motor M1 turns on when the process is enabled and turns off when the limit switch LS detects a bottle under the filler ■ When a bottle stops under the filler, solenoid valve SV opens until proximity sensor PS detects the bottle is full ■ When the bottle is full, infeed conveyor motor M1 turns on until a new bottle arrives under the filler

Part 1.1) Draw the main (power) circuit diagram of the system. Use the graphical symbols provided in the test sheet and identify all components with designator tags.

[10 marks]

Part 1.2) Develop a relay control circuit (without using a PLC) that implements the requirements for the system. Use the graphical symbols provided in the test sheet and identify all components with designator tags. [20 marks]

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RMIT University | School of Engineering | EEET2105/EEET2388 Mid-semester Test 2020

Part 2) Part 2.1) Minimise the following Boolean equation, writing down your answer in the indicated area. [15 marks]

Y = A +AB+AB+A + B+ AB Part 2.2) Develop a PLC ladder software that implements the original Boolean equation from Part 2.1). [15 marks]

Part 2.3) Develop a PLC ladder software that implements the minimised Boolean equation from Part 2.1). [5 marks]

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RMIT University | School of Engineering | EEET2105/EEET2388 Mid-semester Test 2020

Part 3) Consider the airport baggage claim system illustrated in Figure 2. It contains a main loop conveyor where luggage flow around and can be picked up by passengers. Luggage is delivered to the main loop conveyor via an infeed conveyor connected to the luggage distribution network. The main loop conveyor operates continuously while the system is on. The infeed conveyor operates at specific times, defined according to information from the proximity sensor PS, to prevent luggage clashes. The system starts by pressing a START push-button and stops by pressing a STOP push-button. An ON lamp indicates the system is on. An audible SIREN operates for 10 seconds when the system starts.

START

STOP

ON

SIREN

User Interface

Main Loop Conveyor

Luggage

Infeed Conveyor

Distribution Network

PS

Figure 2 The system elements have the following characteristics: ■ Main loop conveyor operates from a contactor K1 commanded by a 24 Vdc coil ■ Infeed conveyor operates from a contactor K2 commanded by a 24 Vdc coil ■ Proximity sensor PS is capacitive normally-open type ■ START push-button is normally-open type and STOP push-button is normally-closed type ■ ON lamp and audible SIREN operate with 24 Vdc The following narrative describes the requirements for the system: ■ The system is turned on by pressing the START push-button and is turned off by pressing the STOP push-button ■ The ON lamp indicates the system is turned on ■ The audible SIREN operates for 10 seconds when the system starts ■ The main loop conveyor operates continuously while the system is on ■ The infeed conveyor can operate only if the system is on ■ The infeed conveyor turns on if no luggage is sensed by the proximity sensor PS for 5 seconds ■ The infeed conveyor turns off (if it was on) if a luggage is sensed by the proximity sensor PS

Part 3.1) Develop a PLC hardware for this airport baggage claim system. Clearly indicate how the system elements connect to the PLC digital inputs and outputs. Use the symbols provided in the test sheet. [10 marks]

Part 3.2) Develop a PLC ladder software for the system control. Use the generic ladder instructions provided in the test sheet. [25 marks]

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