MATLAB: Is it possible to specify an initial condition for the Rate Limiter Dynamic block in Simulink 7.3 (R2009a)

conditiondynamicinitiallimiterratesimulink

I would like to be able to specify an initial condition for the Rate Limiter Dynamic block.

Best Answer

The ability to specify an initial condition for the Rate Limiter Dynamic block is not available in Simulink 7.3 (R2009a).

To workaround this issue, you can make a copy of the Rate Limiter Dynamic block and change the underlying Unit Delay block.

A better approach would be to edit the blocks mask to transfer the initial condition as a dialog parameter for the Rate Limiter Dynamic block.

Related Solutions

MATLAB: Rate Limiter Block ignores the Initial Condition

The Rate Limiter block ignores the initial condition if the sample time of the block is continuous. Instead, it will simply pass the initial value of the input. The sample time must be discrete for the Rate Limiter block to enforce the initial condition parameter. See documentation page for Rate Limiter block for more information:

https://www.mathworks.com/help/simulink/slref/ratelimiter.html

As a workaround, you can specify the initial value of any signal with the IC block (see documentation link below).

https://www.mathworks.com/help/simulink/slref/ic.html

MATLAB: How to annotate the Signal Builder Block in Simulink 7.3 (R2009a)

This enhancement has been incorporated in Release 2011a (R2011a). For previous product releases, read below for any possible workarounds:

This is a limitation in Simulink 7.3 (R2009a) and earlier versions. To work around this issue, use the SIGNALBUILDER command. For example:

[t, d, sig_lbls, group_lbls]=signalbuilder(gcb);
indx=signalbuilder(gcb,'activegroup');
group_lbls{indx}

Behavior similar to the annotation functionality could be achieved by putting the code above into the "StartFcn" block callback and set the name of the block to the group name. But this is only a partial work around because the name would be updated only when the model is run.

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Related Solutions

MATLAB: Rate Limiter Block ignores the Initial Condition

MATLAB: How to annotate the Signal Builder Block in Simulink 7.3 (R2009a)

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