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Simulink: Why is it so hard to have copies of a block?

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Viren
Viren 2013-12-3
关闭： MATLAB Answer Bot 2021-8-20
I have a library of different components for heat transfer analysis. Two of them are basically copies of each other (the evaporator and condenser) with tiny differences. They use an S Function that is written in matlab.
Now, whenever I have them both in a simulink model at the same time, I get an error that has something to do with simulink being unable to differentiate between the Pressure variable of the two blocks.
I found out that this error is resolved when I use a CMEX function instead of the matlab sFunction. Anyone know why this might be happening?
Also, since I had the CMEX function from a former colleague, I do not know how to convert my matlab sFunction into a C SFunction. I tried using the Matlab Coder, but I got the same error as this guy: http://www.mathworks.com/matlabcentral/answers/53964
I tried using an Fcn block instead (with one input (u) and one output (sys), hoping to replicate sFunction functionality , but simulink threw an error about wrong dimensions.
Any advice? Thanks in advance for any help.
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Ketan
Ketan 2013-12-3
Any chance you can provide the Simulink error messages when
1) The two MATLAB S-functions are used within a model
2) Trying to port over the MATLAB s-function to MATLAB function block
Viren
Viren 2013-12-9
Hi Ketan
Thanks for taking the time to reply. I would provide the error message, but I fear it won't be much use. We use a proprietary 'library' of functions that is used to calculate refrigerant properties. The error comes from that library, although it's origin is likely in Simulink rather than the library itself.

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