Thread Subject: What is the maximum Tolerance in Simulink??????

Dear friends,

      I would like to know What is the maximum Tollerence that can be mentioned in Simulink simulation. I have mentioned a Tolerance of "if((slope >0.1*10^-16)". Is it valid. As i can get good results at this tolerence. Long back I have read about the the maximum tolerance that can be mentioned in Simulink but I dont find it. please tell me were I can find this information.

Embedded Matlab Function block:

function y = fcn(u,t)
%#eml

persistent mytime;
persistent counter;

if(isempty(mytime))
    mytime = 0;
    counter = 0;
    y = 0;
else
    
    slope = u;
    check_time = t;
    
    if((slope >0.1*10^-16) && (counter < 1) && (check_time > 2))
        mytime = t;
        counter = 1;
        
        y = mytime;
    else
        y = mytime;
        
    end
    
end

Thanking you,

Sandhi