In your code you are linearizing at default model operating point. If you want to linearize a model at a speciific simulation time or at specific operating condition (for example, your model states are at steady state, and output is equal to number x), you need to trim the model first, using findop command.
To trim at a simulation time of 5 secs and then linearize the model at that condition:
>>op=findop(model,5);
>>sys=linearize(model,op,ios)
To see inputs and outputs, add inports and outports accordingly. Then simply do
>>op
HTH.
Arkadiy
