6.1 Identify THREE programming methods used in programmable logic controllers (PLCs). 6.2 Name TWO INPUT devices that may be connected to the input stage of a PLC. 6.3 State THREE disadvantages of a hardwired system in comparison with a PLC system. 6.4 Explain how low-current devices, such as transistors, may be activated by the output of a PLC. 6.5 Write the simplified Boolean equation for the expression below. Use a four-variable Karnaugh map. X = \overline{A}BC\overline{D} + AB\overline{C}D + ABCD + \overline{A}BCD + A\overline{B}C\overline{D} + A\overline{B}CD + \overline{A}BC + AB + AB 6.6 Simplify the following Boolean equation by using Boolean algebra. Q = AB + A \overline{B} + ABC + AB 6.7 Refer to FIGURE 6.1. Determine the output at the following points: 6.7.1 W 6.7.2 X 6.7.3 Y 6.7.4 Z 6.8 Name the following ladder logic symbols: 6.8.1 6.8.2 6.8.3 6.9 Refer to FIGURE 6.2 and answer the questions that follow. 6.9.1 Draw the ladder logic diagram that will execute the same function in a PLC system. 6.9.2 Give ONE example where the circuit in FIGURE 6.2 may be used in an electrical application.

NSC Electrical Technology Electronics Multivibrators: 6.1 Identify THREE programming m

6.1 Identify THREE programming methods used in programmable logic controllers (PLCs) - NSC Electrical Technology Electronics - Question 6 - 2016 - Paper 1

Question 6

6.1 Identify THREE programming methods used in programmable logic controllers (PLCs). 6.2 Name TWO INPUT devices that may be connected to the input stage of a PLC. ... show full transcript

Worked Solution & Example Answer:6.1 Identify THREE programming methods used in programmable logic controllers (PLCs) - NSC Electrical Technology Electronics - Question 6 - 2016 - Paper 1

Step 1

Identify THREE programming methods used in programmable logic controllers (PLCs)

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Answer

Ladder Logic Programming
Functional Block Programming
Structured Text Programming

Step 2

Name TWO INPUT devices that may be connected to the input stage of a PLC

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Answer

Push Buttons
Limit Switches

Step 3

State THREE disadvantages of a hardwired system in comparison with a PLC system

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Answer

Difficulty in modification or expansion
Increased complexity in troubleshooting
Higher likelihood of errors with physical wiring changes

Step 4

Explain how low-current devices, such as transistors, may be activated by the output of a PLC

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Answer

Low-current devices can be activated by connecting them to a PLC output relay, which delivers a suitable output voltage. In the case of using a transistor output, the PLC provides a sufficient voltage to control low-current devices directly, facilitating efficient control mechanisms within the system.

Step 5

Write the simplified Boolean equation for the expression below. Use a four-variable Karnaugh map.

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Answer

Using the Karnaugh map method, we group the relevant terms to simplify the expression. The simplified Boolean equation after analyzing the Karnaugh map will yield:

$X = AB + CD$

Step 6

Simplify the following Boolean equation by using Boolean algebra.

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Answer

Applying Boolean algebra, we can simplify the equation: $Q = AB + A\overline{B} + ABC + AB = AB + A\overline{B}$

Step 7

Determine the output at the following points: 6.7.1 W

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W = A + B

Step 8

Determine the output at the following points: 6.7.2 X

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X = A + C

Step 9

Determine the output at the following points: 6.7.3 Y

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Y = AB

Step 10

Determine the output at the following points: 6.7.4 Z

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Z = (A + B)(A + C)(A, B)

Step 11

Name the following ladder logic symbols: 6.8.1

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Answer

Normally open contact / switch

Step 12

Name the following ladder logic symbols: 6.8.2

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Normally closed contact

Step 13

Name the following ladder logic symbols: 6.8.3

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(Coil) output

Step 14

Draw the ladder logic diagram that will execute the same function in a PLC system.

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Answer

The ladder logic diagram should include an ON/OFF switch (Start/Stop), motor control relay (MC1), and stall protection. The diagram should visually represent the control sequence ensuring that pressing Start energizes the coil, while pressing Stop de-energizes it.

Step 15

Give ONE example where the circuit in FIGURE 6.2 may be used in an electrical application.

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Answer

Motor starter circuit applications, such as starting an electric motor safely with overload protection.

6.1 Identify THREE programming methods used in programmable logic controllers (PLCs) - NSC Electrical Technology Electronics - Question 6 - 2016 - Paper 1

Worked Solution & Example Answer:6.1 Identify THREE programming methods used in programmable logic controllers (PLCs) - NSC Electrical Technology Electronics - Question 6 - 2016 - Paper 1

Identify THREE programming methods used in programmable logic controllers (PLCs)

Name TWO INPUT devices that may be connected to the input stage of a PLC

State THREE disadvantages of a hardwired system in comparison with a PLC system

Explain how low-current devices, such as transistors, may be activated by the output of a PLC

Write the simplified Boolean equation for the expression below. Use a four-variable Karnaugh map.

Simplify the following Boolean equation by using Boolean algebra.

Determine the output at the following points: 6.7.1 W

Determine the output at the following points: 6.7.2 X

Determine the output at the following points: 6.7.3 Y

Determine the output at the following points: 6.7.4 Z

Name the following ladder logic symbols: 6.8.1

Name the following ladder logic symbols: 6.8.2

Name the following ladder logic symbols: 6.8.3

Draw the ladder logic diagram that will execute the same function in a PLC system.

Give ONE example where the circuit in FIGURE 6.2 may be used in an electrical application.

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