Changing initial parameters in a FMU created in simulink

Hi

I have created a robot ar with p starting position X, Y, Z and a spring that connects to the robot end effector with a spring that is L long. I have exported this simulink model to an FMU inorder to use it in python. 

Is it posible to change the value of X, Y, Z and L using pyfmi before using it in pythuon and if it is, then how?

Thanks again for youre time and help. I know that this is not exaclyt inside the expertise of this fine comunity but have no were else to go.

Eric R