Connecting blocks with signal lines in Simulink - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to connect two blocks with a signal line.

Simulink

add_block('simulink/Sources/Sine Wave', 'model/SineWave');
add_block('simulink/Sinks/Scope', 'model/Scope');
add_line('model', 'SineWave/1', [1], 'autorouting', 'on');

Drag options to blanks, or click blank then click option'

A'Scope/1'

B'Scope/2'

C'SineWave/2'

D'Scope/3'

Attempts:

3 left

💡 Hint

Common Mistakes

Connecting to a non-existent port number.

Mixing up source and destination ports.

The signal line connects the output port 1 of the Sine Wave block to the input port 1 of the Scope block.

2fill in blank

medium

Complete the code to connect the output of a Gain block to the input of a Display block.

Simulink

add_block('simulink/Math Operations/Gain', 'model/Gain');
add_block('simulink/Sinks/Display', 'model/Display');
add_line('model', [1], 'Display/1', 'autorouting', 'on');

Drag options to blanks, or click blank then click option'

A'Gain/1'

B'Gain/2'

C'Display/2'

D'Display/1'

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong port number for the Gain block output.

Confusing input and output ports.

The output port of the Gain block is port 1, so we connect 'Gain/1' to the Display input.

3fill in blank

hard

Fix the error in the code to correctly connect a Sum block output to a Scope input.

Simulink

add_block('simulink/Math Operations/Sum', 'model/Sum');
add_block('simulink/Sinks/Scope', 'model/Scope');
add_line('model', 'Sum/1', [1], 'autorouting', 'on');

Drag options to blanks, or click blank then click option'

A'Scope/2'

B'Sum/3'

C'Scope/1'

D'Sum/2'

Attempts:

3 left

💡 Hint

Common Mistakes

Connecting to a non-existent port on the Scope block.

Mixing source and destination ports.

The Sum block output is port 1, and the Scope input is port 1, so connect 'Sum/1' to 'Scope/1'. The code already has 'Sum/1' as source, so the destination must be 'Scope/1'.

4fill in blank

hard

Fill both blanks to connect a Product block output to a Scope input and enable autorouting.

Simulink

add_block('simulink/Math Operations/Product', 'model/Product');
add_block('simulink/Sinks/Scope', 'model/Scope');
add_line('model', [1], [2], 'autorouting', 'on');

Drag options to blanks, or click blank then click option'

A'Product/1'

B'Scope/1'

C'Scope/2'

D'Product/2'

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong port numbers for either block.

Swapping source and destination ports.

The output port of the Product block is port 1, and the Scope input port is 1, so connect 'Product/1' to 'Scope/1'.

5fill in blank

hard

Fill all three blanks to create a dictionary mapping block names to their output ports, filtering only those with output port number greater than 1.

Simulink

output_ports = { [1]: [2] for [3] in blocks if [2] > 1 }

Drag options to blanks, or click blank then click option'

Ablock.name

Bblock.output_port

Cblock

Dblock.input_port

Attempts:

3 left

💡 Hint

Common Mistakes

Using input_port instead of output_port.

Using block instead of block.name as key.

This dictionary comprehension maps each block's name to its output port, but only includes blocks where the output port number is greater than 1.

Practice

1. In Simulink, what is the main purpose of connecting blocks with signal lines?

easy

A. To pass data from one block to another

B. To change the color of blocks

C. To delete blocks automatically

D. To rename blocks in the model

Solution

1. Step 1: Understand signal lines in Simulink

   Signal lines are used to transfer data between blocks in a model.

2. Step 2: Identify the purpose of connecting blocks

   Connecting blocks with signal lines allows data flow from one block's output to another block's input.

3. Final Answer:

   To pass data from one block to another -> Option A

4. Quick Check:

   Signal lines = Data transfer [OK]

Hint: Signal lines always carry data between blocks [OK]

Common Mistakes:

• Thinking signal lines change block appearance
• Confusing signal lines with block properties
• Assuming signal lines delete blocks

2. Which of the following is the correct way to connect two blocks in Simulink?

easy

A. Drag from the input port of the first block to the output port of the second block

B. Drag from the output port of the first block to the input port of the second block

C. Click both blocks and press delete

D. Right-click the block and select 'Connect'

Solution

1. Step 1: Identify correct connection direction

   Signal lines flow from output ports to input ports in Simulink.

2. Step 2: Match dragging action to ports

   You must drag from the output port of the first block to the input port of the second block to connect them.

3. Final Answer:

   Drag from the output port of the first block to the input port of the second block -> Option B

4. Quick Check:

   Output to input drag = Correct connection [OK]

Hint: Always drag from output to input port [OK]

Common Mistakes:

• Dragging from input to output port
• Trying to connect by right-click menu
• Deleting blocks instead of connecting

3. Consider two blocks: Block A outputs a constant value 5, and Block B adds 3 to its input. If you connect Block A's output to Block B's input, what is the output of Block B?

medium

A. 5

B. 3

C. 8

D. 15

Solution

1. Step 1: Understand Block A's output

   Block A outputs a constant value of 5.

2. Step 2: Calculate Block B's output

   Block B adds 3 to its input, so output = 5 + 3 = 8.

3. Final Answer:

   8 -> Option C

4. Quick Check:

   5 + 3 = 8 [OK]

Hint: Add input value to Block B's constant [OK]

Common Mistakes:

• Ignoring the addition in Block B
• Confusing input and output values
• Assuming output equals input without change

4. You tried to connect two blocks but the signal line does not appear. What is the most likely reason?

medium

A. You connected two output ports

B. You dragged from the input port to the output port

C. You clicked the blocks without dragging

D. You dragged from the output port to the input port correctly

Solution

1. Step 1: Check connection rules in Simulink

   Signal lines must connect an output port to an input port.

2. Step 2: Identify invalid connection

   Connecting two output ports is invalid and will not create a signal line.

3. Final Answer:

   You connected two output ports -> Option A

4. Quick Check:

   Output to output connection = No signal line [OK]

Hint: Connect output port to input port only [OK]

Common Mistakes:

• Connecting input to input ports
• Clicking without dragging
• Dragging from input to output port

5. You have three blocks: Block X outputs a signal, Block Y multiplies input by 2, and Block Z adds 4 to input. How should you connect these blocks to get the output as (X * 2) + 4?

hard

A. Connect Y output to X input, then X output to Z input

B. Connect X output to Z input, then Z output to Y input

C. Connect Z output to Y input, then Y output to X input

D. Connect X output to Y input, then Y output to Z input

Solution

1. Step 1: Determine operation order

   The expression (X * 2) + 4 means multiply first, then add.

2. Step 2: Connect blocks accordingly

   Connect Block X output to Block Y input (multiply by 2), then connect Block Y output to Block Z input (add 4).

3. Final Answer:

   Connect X output to Y input, then Y output to Z input -> Option D

4. Quick Check:

   Multiply then add = X->Y->Z [OK]

Hint: Follow math order: multiply first, then add [OK]

Common Mistakes:

• Reversing connection order
• Connecting add before multiply
• Connecting outputs to outputs