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 = A̅BCD + AB̅CD + ABCD + A̅BCD + A̅B 6.6 Simplify the following Boolean equation by using Boolean algebra. Q = A̅BC + AB + A̅C + 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 Amplifier Theory: 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. 6... 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
Structured Text (ST)
Function Block Diagram (FBD)

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

Lack of flexibility: Changes in operation require physical rewiring.
Difficulty in troubleshooting: Hardwired systems often make it challenging to diagnose faults without specialized tools.
Increased time for modification: Changes or expansions can lead to significant downtime, unlike PLC systems which can often be reprogrammed quickly.

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 via the output relay of the PLC to a power source. When the PLC output signal is activated, it sends current to the relay, which closes the circuit, allowing power to flow to the connected low-current device.

Step 5

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

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Answer

The simplified equation is: $X = AB + A̅C + A̅D$

Step 6

Simplify the following Boolean equation by using Boolean algebra.

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Answer

Q = A̅BC + AB + A̅C + AB By applying the Consensus theorem, we can simplify it to: $Q = BC + A̅$

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 = A imes B

Step 10

Determine the output at the following points 6.7.4 Z

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Z = (A + B)(A + C)(A̅ + 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 6.9.1

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Answer

The ladder logic diagram will show the Start, Stop, and OL contacts in a series with the motor contactor MC1 and a hold-in circuit.

Step 15

Give ONE example where the circuit in FIGURE 6.2 may be used in an electrical application 6.9.2

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Answer

A motor starter for industrial machinery.

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 6.9.1

Give ONE example where the circuit in FIGURE 6.2 may be used in an electrical application 6.9.2

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