7.1 Explain the advantages of PLC systems with regard to the following:
7.1.1 Space
7.1.2 Flexibility
7.2 FIGURE 7.2 below shows the ladder logic of a logic gate - NSC Electrical Technology Power Systems - Question 7 - 2023 - Paper 1
Question 7
7.1 Explain the advantages of PLC systems with regard to the following:
7.1.1 Space
7.1.2 Flexibility
7.2 FIGURE 7.2 below shows the ladder logic of a logic gate.... show full transcript
Worked Solution & Example Answer:7.1 Explain the advantages of PLC systems with regard to the following:
7.1.1 Space
7.1.2 Flexibility
7.2 FIGURE 7.2 below shows the ladder logic of a logic gate - NSC Electrical Technology Power Systems - Question 7 - 2023 - Paper 1
Step 1
7.1.1 Space
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Answer
PLC systems significantly reduce the need for physical space by integrating various functions into a single device, minimizing the requirement for large relay panels and reducing wiring complexity.
Step 2
7.1.2 Flexibility
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Answer
PLCs offer high flexibility as they can be programmed and re-programmed to accommodate changing processes or functions, allowing for quick adjustments without extensive hardware modifications.
Step 3
7.2.1 Name the logic gate represented in FIGURE 7.2 above.
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The logic gate represented in FIGURE 7.2 is a NOR gate.
Step 4
7.2.2 Draw the equivalent logic gate symbol of FIGURE 7.2.
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Answer
The equivalent logic gate symbol for a NOR gate can be illustrated as follows:
A ----|\
| >o---- Output
B ----|/
Step 5
7.2.3 Complete the truth table in FIGURE 7.3 by writing only the state of the output.
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Answer
For the given input combinations:
For A = 0 and B = 0, the output will be 1 (W).
For A = 0 and B = 1, the output will be 0 (X).
Step 6
7.3.1 Name the type of proximity sensor that utilises an electrostatic field (e-field) to sense proximity.
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The type of proximity sensor that utilises an electrostatic field to sense proximity is known as a capacitive proximity sensor.
Step 7
7.3.2 Describe the purpose of a light sensor in an automated garage door.
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A light sensor in an automated garage door acts as a safety feature to prevent the door from closing when an object obstructs the beam of light, allowing the door to remain open until the path is clear.
Step 8
7.3.3 Explain how a temperature sensor is used to prevent a grinding mill from break.
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A temperature sensor monitors the temperature of the grinding mill to detect any increases that may indicate overheating. When a dangerous level is reached, the sensor triggers an alert to stop the machinery, preventing damage or breakdown.
