Thermal mass variable beginning temperature

Hey guys,

I have one "Thermal Mass" block in Simulink, which represents a thermal mass, which is the ability of a material or combination of materials to store internal energy. In this standard block of Simulink, the initial temperature must be entered. Only one signal can be connected to the block.

I would like to build another component, whose initial temperature can come from another block. So, one input parameter and everything else should be the same. I have edited the block to have two signal able to connect; the node and the initial temperature. My idea was to define an input S and a node M, and then give the valor of S to T.

But when I define the variable 'T = {value = {S, 'K'}, priority = priority.high};', it fails.

component mass_v1
% Thermal Mass
% This block models internal energy storage in a thermal network. The rate
% of temperature increase is proportional to the heat flow rate into the
% material and inversely proportional to the mass and specific heat of the
% material.
 
inputs
    S = {293.15, 'K'}; % S:bottom
end
 
nodes
    M = foundation.thermal.thermal; % :top
end
 
parameters
    mass    = {1,   'kg'      }; % Mass
    sp_heat = {447, 'J/(kg*K)'}; % Specific heat
end
 
variables (Access=private)
    T = {value = {S, 'K'}, priority = priority.high}; % Temperature
end
 
variables
    Q = {0, 'W'}; % Heat flow rate
end
 
branches
    Q : M.Q -> *;
end
 
equations
    assert(mass > 0)
    assert(sp_heat > 0)
    T == M.T;
    Q == mass * sp_heat * T.der;
    assert(T > 0, 'Temperature must be greater than absolute zero')
end
 
end

I need to extract the initial temperature of the block because when I export the model to FMU, this parameter becomes in constant.

Any idea how this can be done?

Best regards,