MATLAB: Stepping through sorted order of Simulink model

displaysimulinksort order

I have a Simulink model that may be executing blocks in a different order than I expect. So, I would like to check the order that the blocks are executed. The information returned by Format > Block Displays > Sort Order is not intuitive. I would prefer to "step" through the model and highlight each block as it is being executed, pulling up whatever subsystem that the block resides in. I don't need to go through the entire simulation; just a couple of loops through should be enough.

Is it possible to step through blocks in their order of execution?

Best Answer

Yes, you can do that with the Simulink Debugger.

Related Solutions

MATLAB: Do subsystems feeding bus signals into a Switch block not execute conditionally

What you are seeing is that conditional execution is not being applied because this is no longer a simple switch. If you examine the execution order you will notice that the relevant Switch block (Which is named: mysoup1\Switch1 in the example below) is actually two blocks while the model is running.

From the debugger:

 (sldebug @62): >> slist
 ---- Sorted list for 'mysoup1' [11 nonvirtual blocks, directFeed=0]
   0:0    'mysoup1/Constant1' (Constant, tid=1)
   0:1    'mysoup1/TmpAtomicSubsysAtSwitchInport1' (SubSystem, tid=1)
   0:2    'mysoup1/TmpAtomicSubsysAtSwitchInport3' (SubSystem, tid=1)
   0:3    'mysoup1/Switch' (Switch, tid=1)
   0:4    'mysoup1/Display' (Display, tid=1)
   0:5    'mysoup1/Subsystem' (SubSystem, tid=1)
   0:6    'mysoup1/Constant3' (Constant, tid=1)
   0:7    'mysoup1/Subsystem1' (SubSystem, tid=1)
   0:8    'mysoup1/Switch1/Switch1_1' (Switch, tid=1)
   0:9    'mysoup1/Switch1/Switch1_2' (Switch, tid=1)
   0:10   'mysoup1/Display1' (Display, tid=1)

The bus has two signals in it, and this switch block converts into two switches to handle them. For some of the blocks that support bus signals, this method of expanding the bus with multiple blocks is the way that they are implemented. Given that this is a composite signal this is the current expected behavior.

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)

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.

Best Answer

Related Solutions

MATLAB: Do subsystems feeding bus signals into a Switch block not execute conditionally

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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