Stored Programme Systems NCV Level 3 — Document
February 2020 — NCV Level 3 — Stored Programme Systems
NCV Level 3
2020
NCV IT
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Q1— Section header —
1.1What is the purpose of the power supply? (1 2\ (2\
1.2List THR EE subsections that make up the CPU. (3 1\ (3\
1.3Draw an opto isolating input that will represent one input of the digital input/output module. (4 1\ (4\
1.4Draw a relay output that will represent one output of the digital input/output mo dule. (4 1\ (4\
1.5Explain what the purpose of the communications module is. (1 2\ (2\ [15]15
Q2— Section header —
2.1The Joint International Standard (JIS\and the International European Commission (IEC\ generic ally name to all sensors that pr ovide non contact
2.1.1What is the name of the sensor that detects metal objects? (1 1\ (1\
2.1.2Explain the operation of the sensor that detects metal objects. (1 2\ (2\ POWER SUPPLY CPU D I/O
2.1.4Explain the operation of the sensor that detects metal and non metal objects. (1 2\ (2\
2.2Proximity ensor include all sensors that perform non contact detection in comparison to sensors, such as limit switches, that detect objects by
2.2.2
2.3Draw a fully labelled block diagram of an inductive sensor system. (Not the inductive sensor symbol\ (7 1\ (7\ [20]20
Q3— Section header —
3.1FIGURE 2 shows a conveyor belt syste m connected to a PLC controller for control. FIGURE Draw the electrical connection diagram of the PLC (10
2.1.3What is the name of the se nsor that detects metal and non metal objects? (1 1\ (1\
2.1.5What is the na me of the sensor that uses a magnet to detect the presence of an object? (1 1\ (1\
2.1.6Explain the operation of the sensor that uses a magnet to detect the presence of an objec t. (1 2\ (2\
2.2.1Name TWO advantages of using a limit switch. P/S PLC X1 START STOP RUN
3.2Explain the purpose of the electrical connection diagram. (1 2\ (2\
3.3Explain the purpose of the emergency stop mushroom head push button. (1 2\ (2\
3.4Explain how the emergency stop operates when working in conjunction with a safety relay and a PLC controlled application. (3 1\ (3\
3.5List THREE d rive actuators used in PLC automated applications. (3 1\ (3\ [20] (10040103\20
Q4— Section header —
4.1Study the PLC control code used in an automated PLC application shown in FIGURE 3 FIGURE 3 Answer the following related questions.
4.1.1The virtual special relay (AR\ has different characteristics to that of a virtual output (Q\ coil. Explain this difference. (2 2\ (4\ START I1
4.1.2Name TWO other special virtual relays used in this application PLC control code. (2 1\ (2\
4.1.3Explain the purpose of program lines (1 5\ (5 1\ (5\
4.1.4What is the purpose of the vir tual contact (C01\line 5? (1 2\ (2\
4.1.5What is the purpose of the sensor virtual contact (I3\ line 7? (1 2\ (2\
4.1.6What is the purpose having line 9 in the application PLC control code? (1 2\ (2\
4.1.7What is the purpose of the timer (T01\in the application PLC control code? (1 2\ (2\
4.1.8Write down the summary of operation of the PLC application control code given a FIGURE 3. (5 1\ (5\
4.2ith the aid of a piece of PLC control code show how virtual cascaded timers can be used to turn on three motor control relays in a positive sequence having 10 second starting intervals. (6
Q5— Section header —
5.1Troubleshooting requ ires out of the box thinking to solve automated PLC related malfunctions, therefore knowledge of various aspects of the controlled application is required to be known. List SIX related
5.2Explain how the THREE diagnostic indicators will assist one in trouble shooting PLC central processing unit. (3
5.3Explain with the aid of a drawing how the output LEDs can assist one to determine whether a PLC program fault or f ield device is malfunctioning. (4
Topics Identified
1
Business Plan
Mark Allocation
Total100 marks
Sections15 + 20 + 20 + 30 + 15 = 100 marks
Paper information
TitleDocument
SubjectStored Programme Systems
LevelNCV Level 3
Document typeQuestion paper
Year2020
MonthFebruary
Pages7
Downloads4
Examination context
Decade2020s
Years ago6y
SeasonSummer (SH)
Start daySaturday
Exam periodFebruary 2020
Days since exam2,443
About Stored Programme Systems examination preparation
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