See https://github.com/tbeu/ExternData/issues/11

M.mo

model M
  Modelica.Blocks.Math.Gain gain1(k=combiTimeTable1.t_min) annotation(Placement(transformation(extent={{-105,55},{-85,75}})));
  Modelica.Blocks.Sources.Clock clock1 annotation(Placement(transformation(extent={{-140,55},{-120,75}})));
  Modelica.Blocks.Sources.CombiTimeTable combiTimeTable1(table=[0.5,1;1,2]) annotation(Placement(transformation(extent={{-70,55},{-50,75}})));
  equation
    connect(clock1.y,gain1.u) annotation(Line(
      points={{-119,65},{-114,65},{-112,65},{-107,65}},
      color={0,0,127}));
 annotation(uses(Modelica(version="3.2.1")));
end M;