MATLAB: Is the sorted order not displayed on the Sum block when one of the inputs is a Unit Delay block, in Simulink 7.4 (R2007a)

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I want to view the sorted order of blocks in my model. When I update the diagram, the sorted order for the Sum Block is not displayed.

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This is expected behavior and is a result of Block Reduction Optimization. In this model, the construct is a Sum block connected to the Unit Delay. Simulink recognizes this as an accumulator, and these two blocks are combined. As a result the Sum block does not dispay a separate sorted order.

To turn off the above optimization, uncheck 'Block Reduction' from Simulation->Configuration Parameters->Optimization.

Related Solutions

MATLAB: Does the ‘Unit Delay’ block with a bus signal input display “0:B” as the sorted order in Simulink 6.6 (R2007a)

This bug has been fixed in Release 2007b (R2007b). For previous product releases, read below for any possible workarounds:

The reason for this, is that the operation the block performs on the bus might depend on how the signals in the bus are connected. It is not possible to include that information in this display, so we display a simple s:B on the block. All bus enabled blocks display this type of sorted order. To see what is really going on, download the attached model and execute the following in MATLAB:

bus_sorting_demo

Notice the Unit Delay block. When you update diagram and (Ctrl+D) you will see it has the sorted order 0:B. Now debug the model, by executing the commands below:

sldebug(bdroot)
slist

Look for the Unit Delay block in the sorted order, now it is actually 5 blocks. Thus, a Unit Delay is applied for each signal in the bus, and the orders of these five delays are different from each other.

Stop debugging by executing the command below:

stop

MATLAB: Problem combining Count and switch block in simulink

The issue occurred primarily because the Switch block is being used before the Counter block in your Simulink model. In order to switch the input signal based on the number of counts, the switch block should be used after the count block as shown below. To reset the number of counts depending on the cycles counted, select the Reset Input port check box in Counterblock. When you enable the Rst port, the block resets the counter to its initial value each time a trigger event occurs at the Rst port.The type of trigger event is based on the Count event parameter in the counter block. The Period of the input signal should be specified as a value greater than the fixed value (i.e. “5”) selected to reset the input signal. In the given model, the Period is selected as “6”.

For more information refer to the documentation given below:

https://www.mathworks.com/help/dsp/ref/counter.html

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Related Solutions

MATLAB: Does the ‘Unit Delay’ block with a bus signal input display “0:B” as the sorted order in Simulink 6.6 (R2007a)

MATLAB: Problem combining Count and switch block in simulink

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