I have created a model that is fed by a random noise block from the standard systems dynamics library which creates a new set of values when i re-simulate in Dymola fine. Different random values for every simulation. The same does not happen when running the same model in OMEdit and I cannot work out why. I would be really grateful if anyone had any ideas. Probably something simple as ticking a box somewhere.

i get the following warnings:

[1] 10:18:50 Translation Warning
Assuming fixed start value for the following 2 variables:
         Mine_Grade.y:DISCRETE(fixed = false ) .test_System_Dynamics.test_Flowsheet2016, .SystemDynamics.Functions.NoiseNormal$Mine_Grade, .Modelica.Blocks.Interfaces.RealOutput type: Real
         Mine_output.y:DISCRETE(fixed = false ) .test_System_Dynamics.test_Flowsheet2016, .SystemDynamics.Functions.NoiseNormal$Mine_output, .Modelica.Blocks.Interfaces.RealOutput type: Real


Code involved is below.

Any help greatly appreciated.

block NoiseNormal "Normally distributed random noise"
  parameter Real mean = 0 "Mean value of random noise";
  parameter Real stdev = 100 "Standard deviation of random noise";
  parameter Real tSample = 1 "Noise sample time";
  Modelica.Blocks.Interfaces.RealOutput y annotation(Placement(visible = true, transformation(origin = {90.0,0.0}, extent = {{-10.0,-10.0},{10.0,10.0}}, rotation = 0), iconTransformation(origin = {90.0,0.0}, extent = {{-10.0,-10.0},{10.0,10.0}}, rotation = 0)));
equation
  when initial() then
          SystemDynamics.Functions.Utilities.InitRandomNormal();
 
  end when;
  when sample(0, tSample) then
          y = mean + stdev * SystemDynamics.Functions.Utilities.RandomNormal(time);
 
  end when;
  annotation(Diagram(coordinateSystem(extent = {{-100.0,-100.0},{100.0,100.0}}, preserveAspectRatio = true, initialScale = 0.1, grid = {10,10})), Icon(coordinateSystem(extent = {{-100.0,-100.0},{100.0,100.0}}, preserveAspectRatio = true, initialScale = 0.1, grid = {10,10}), graphics = {Rectangle(visible = true, lineColor = {0,0,255}, extent = {{-80.0,-80.0},{80.0,80.0}}),Text(visible = true, lineColor = {0,0,255}, extent = {{-0.0,-124.0},{0.0,-80.0}}, textString = "%name", fontName = "Arial"),Text(visible = true, lineColor = {0,0,255}, extent = {{-6.0,36.0},{-6.0,68.0}}, textString = "mean=%mean", fontName = "Arial"),Text(visible = true, lineColor = {0,0,255}, extent = {{-4.0,-6.0},{-4.0,24.0}}, textString = "stdev=%stdev", fontName = "Arial"),Text(visible = true, lineColor = {0,0,255}, extent = {{-2.0,-54.0},{-2.0,-24.0}}, textString = "tSample=%tSample", fontName = "Arial")}));
end NoiseNormal;