Mechatronics Technology  ·  Level 5
Programmable Logic Control (Plc) Systems
Chapter 5: Maintain PLC system
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Chapter Practical Activities

Practical 1: Inspect and clean PLC hardware components

Mechatronics Technology · Level 5
Programmable Logic Control (Plc) Systems
PRACTICAL ASSESSMENT
TIME: 4 HOURS
⬇ PDFCandidate Instructions (Candidate Tool)

Type: Individual

INSTRUCTIONS TO CANDIDATE:
1.  You are required to perform the following task:
i.  Inspect and clean the PLC hardware components including modules and wiring on the control panel measuring approximately 600mm x 400mm as per the maintenance checklist.
2.  You have been provided with the following resources for the practical task:
Tools & EquipmentMaterials
Insulated electrical glovesIsopropyl alcohol (70%)
Safety bootsLint-free cleaning cloth
Overall/dust coat
Multimeter
Soft-bristle brush
Isopropyl alcohol (70%)
Lint-free cleaning cloth
Compressed air canister
Phillips screwdriver
Flat screwdriver
Lockout tagout (LOTO) kit
⬇ PDFResources Required (Cutting List)
S/NItemQuantity
1Insulated electrical gloves1 Pair per Candidate
2Safety boots1 Pair per Candidate
3Overall/dust coat1 Pc per Candidate
4Multimeter1 Pc per Candidate
5Soft-bristle brush1 Pc per Candidate
6Isopropyl alcohol (70%)100 ml per Candidate
7Lint-free cleaning cloth2 Pcs per Candidate
8Compressed air canister1 Pc per Candidate
9Phillips screwdriver1 Pc per Candidate
10Flat screwdriver1 Pc per Candidate
11PLC system with modules and wiring1 Set per Candidate
12Lockout tagout (LOTO) kit1 Kit per Candidate
⬇ PDFAssessor Guide
Items to be EvaluatedMarks AvailableMarks ObtainedComments
TASK 1: PPE and Safety Preparation
Wore insulated electrical gloves
(Award 1 mark for correct use)
1
Wore safety boots
(Award 1 mark for correct use)
1
Wore overall/dust coat
(Award 1 mark for correct use)
1
Followed Lockout Tagout (LOTO) procedure correctly
(Award 1 mark each for placing LOTO tag, clear name, accurate date, and isolating power)
3
Sub-Total6
TASK 2: Inspection of PLC Hardware Components
Visually inspected PLC modules for damage or corrosion
(Award 2 marks for thorough inspection)
2
Checked all wiring connections for looseness or wear using multimeter
(Award 1 mark for checking all connections, 2 marks for using multimeter properly)
3
Verified correct wiring routing and no signs of overheating
(Award 2 marks for complete verification)
2
Sub-Total7
TASK 3: Cleaning of PLC Components
Used compressed air to remove dust from PLC modules and wiring
(Award 2 marks for proper use without damaging components)
2
Cleaned PLC module surfaces with isopropyl alcohol and lint-free cloth
(Award 3 marks for correct cleaning technique and no moisture ingress)
3
Used soft-bristle brush to clean connectors and terminals
(Award 2 marks for effective and careful cleaning)
2
Rechecked connections after cleaning for tightness
(Award 2 marks for thorough re-inspection)
2
Sub-Total9
TASK 4: Final Safety and Restoration
Removed LOTO tag and restored power safely
(Award 2 marks for correct and safe power restoration)
2
Ensured PLC powered ON without faults
(Award 2 marks for successful power-up)
2
Sub-Total4
PRODUCT CHECKLIST
PLC hardware components are clean, free from dust and corrosion, and wiring is secure and undamaged
(Award marks based on cleanliness, absence of damage, and secure wiring)
10
PLC system powers ON successfully without error indicators after maintenance
(Award marks for proper system operation post-maintenance)
5
Sub-Total15
GRAND TOTAL41
ASSESSMENT OUTCOME:   ☐ Competent    ☐ Not Yet Competent (competent if at least 50%)

Practical 2: Diagnose and Replace Faulty PLC Input/Output Modules

Mechatronics Technology · Level 5
Programmable Logic Control (Plc) Systems
PRACTICAL ASSESSMENT
TIME: 4 HOURS
⬇ PDFCandidate Instructions (Candidate Tool)

Type: Individual

INSTRUCTIONS TO CANDIDATE:
1.  You are required to perform the following task:
i.  Diagnose faults and replace PLC input and output modules 200mm x 150mm x 50mm.
2.  You have been provided with the following resources for the practical task:
Tools & EquipmentMaterials
Flat head screwdriverPLC input module (24V DC)
Phillips head screwdriverPLC output module (24V DC)
Wire stripperReplacement PLC input/output modules (24V DC)
Wire cutterSingle-strand control wires (1.5mm2, PVC insulated)
Crimping toolCable lugs (fork and pin type, 1.5mm2)
MultimeterLOTO tag
Electrical gloves
Safety boots
Overall/dust coat
⬇ PDFResources Required (Cutting List)
S/NItemQuantity
1PLC input module (24V DC)1 Pc per Candidate
2PLC output module (24V DC)1 Pc per Candidate
3Replacement PLC input/output modules (24V DC)1 set per Candidate
4Multimeter1 Pc per Candidate
5Flat head screwdriver1 Pc per Candidate
6Phillips head screwdriver1 Pc per Candidate
7Wire stripper1 Pc per Candidate
8Wire cutter1 Pc per Candidate
9Crimping tool1 Pc per Candidate
10Single-strand control wires (1.5mm2, PVC insulated)5 metres per Candidate
11Cable lugs (fork and pin type, 1.5mm2)30 Pcs per Candidate
12LOTO tag1 Pc per Candidate
13Electrical gloves1 Pair per Candidate
14Safety boots1 Pair per Candidate
15Overall/dust coat1 Pc per Candidate
⬇ PDFAssessor Guide
Items to be EvaluatedMarks AvailableMarks ObtainedComments
TASK 1: Safety and Preparation
Wore personal protective equipment: safety boots, overall/dust coat, electrical gloves
(Award 1 mark each)
3
Followed Lock Out Tag Out (LOTO) procedure: placed LOTO tag correctly, indicated name clearly, wrote accurate date, safely isolated power supply
(Award 1 mark each)
4
Sub-Total7
TASK 2: Diagnosis of Faulty PLC Modules
Used multimeter to test input module for faults
(Award 2 marks)
2
Used multimeter to test output module for faults
(Award 2 marks)
2
Identified faulty input or output modules correctly
(Award 3 marks)
3
Sub-Total7
TASK 3: Removal and Replacement of Faulty Modules
Selected correct tools for removing modules: flat and Phillips screwdrivers
(Award 1 mark each)
2
Disconnected wiring safely and labeled wires
(Award 2 marks)
2
Removed faulty PLC input/output modules without damage
(Award 2 marks)
2
Prepared replacement modules and wiring: stripped wires, crimped lugs
(Award 1 mark each for stripping, crimping, preparation)
3
Installed replacement PLC input/output modules correctly
(Award 3 marks)
3
Connected wiring to replacement modules correctly according to schematic
(Award 3 marks)
3
Sub-Total15
TASK 4: Testing and Commissioning
Reconnected power supply safely
(Award 2 marks)
2
Powered ON the PLC system
(Award 1 mark)
1
Tested input and output modules functionality using software or indicators
(Award 1 mark each for input test, output test, system response, no error)
4
Sub-Total7
TASK 5: Finalization
Powered OFF system and isolated power supply
(Award 1 mark)
1
Removed LOTO tag and stored tools and materials properly
(Award 1 mark)
1
Cleaned work area and disposed of faulty modules correctly
(Award 1 mark)
1
Sub-Total3
PRODUCT CHECKLIST
Replacement PLC input/output modules installed securely and aligned with mounting dimensions 200mm x 150mm x 50mm
(Award 4 marks)
4
Wiring connections are neat, correctly crimped, labeled, and match schematic wiring
(Award 4 marks)
4
PLC system operates without faults after replacement
(Award 5 marks)
5
Sub-Total13
GRAND TOTAL52
ASSESSMENT OUTCOME:   ☐ Competent    ☐ Not Yet Competent (competent if at least 50%)
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