diff --git a/Buildings/Controls/OBC/CDL/Logical/Sources/Pulse.mo b/Buildings/Controls/OBC/CDL/Logical/Sources/Pulse.mo
index bedaa12cf29..10dc479d517 100644
--- a/Buildings/Controls/OBC/CDL/Logical/Sources/Pulse.mo
+++ b/Buildings/Controls/OBC/CDL/Logical/Sources/Pulse.mo
@@ -17,7 +17,12 @@ protected
   discrete Modelica.SIunits.Time pulseStart "Start time of pulse";
 
 initial equation
-  pulseStart = startTime;
+  if time > startTime then
+    pulseStart = startTime + period * floor((time - startTime)/period);
+  else
+    pulseStart = startTime;
+  end if;
+
 equation
   when sample(startTime, period) then
     pulseStart = time;
@@ -74,6 +79,12 @@ The Boolean output y is a pulse signal:
 </html>", revisions="<html>
 <ul>
 <li>
+September 1, 2020, by Milica Grahovac:<br/>
+Revised initial equation section to ensure expected simulation results when <code>startTime</code> is before simulation start time.
+This is for
+<a href=\"https://github.com/lbl-srg/modelica-buildings/issues/2110\">#2110</a>.
+</li>
+<li>
 March 23, 2017, by Jianjun Hu:<br/>
 First implementation, based on the implementation of the
 Modelica Standard Library.
diff --git a/Buildings/Controls/OBC/CDL/Logical/Sources/Validation/Pulse.mo b/Buildings/Controls/OBC/CDL/Logical/Sources/Validation/Pulse.mo
index 7679a5c3016..54691276215 100644
--- a/Buildings/Controls/OBC/CDL/Logical/Sources/Validation/Pulse.mo
+++ b/Buildings/Controls/OBC/CDL/Logical/Sources/Validation/Pulse.mo
@@ -4,8 +4,22 @@ model Pulse "Validation model for the Boolean Pulse block"
   Buildings.Controls.OBC.CDL.Logical.Sources.Pulse booPul(
     width = 0.5,
     period = 1)
-    "Block that generates pulse signal of type Boolean"
-    annotation (Placement(transformation(extent={{-10,-10},{10,10}})));
+    "Block that generates pulse signal of type Boolean at simulation start time"
+    annotation (Placement(transformation(extent={{-10,20},{10,40}})));
+
+  Buildings.Controls.OBC.CDL.Logical.Sources.Pulse booPul1(
+    width=0.5,
+    period=1,
+    startTime=1.75)
+    "Block that generates pulse signal of type Boolean starting from after the simulation start time"
+    annotation (Placement(transformation(extent={{-10,-20},{10,0}})));
+
+  Buildings.Controls.OBC.CDL.Logical.Sources.Pulse booPul2(
+    width=0.5,
+    period=1,
+    startTime=-1.25)
+    "Block that generates pulse signal of type Boolean starting from before the simulation start time"
+    annotation (Placement(transformation(extent={{-10,-60},{10,-40}})));
 
   annotation (
   experiment(StopTime=5.0, Tolerance=1e-06),
@@ -20,6 +34,12 @@ Buildings.Controls.OBC.CDL.Logical.Sources.Pulse</a>.
 </html>", revisions="<html>
 <ul>
 <li>
+September 1, 2020, by Milica Grahovac:<br/>
+Added test cases for simulation time starting before and after the pulse <code>startTime</code>.
+This is for
+<a href=\"https://github.com/lbl-srg/modelica-buildings/issues/2110\">#2110</a>.
+</li>
+<li>
 July 17, 2017, by Jianjun Hu:<br/>
 First implementation.
 </li>
diff --git a/Buildings/Resources/ReferenceResults/Dymola/Buildings_Controls_OBC_CDL_Logical_Sources_Validation_Pulse.txt b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Controls_OBC_CDL_Logical_Sources_Validation_Pulse.txt
index bf77750865f..40b991a976e 100644
--- a/Buildings/Resources/ReferenceResults/Dymola/Buildings_Controls_OBC_CDL_Logical_Sources_Validation_Pulse.txt
+++ b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Controls_OBC_CDL_Logical_Sources_Validation_Pulse.txt
@@ -1,9 +1,11 @@
-last-generated=2018-06-19
+last-generated=2020-09-01
 statistics-simulation=
 {
   "linear": " ",
   "nonlinear": " ",
   "numerical Jacobians": "0"
 }
-booPul.y=[1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00]
 time=[0e+00, 5e+00]
+booPul.y=[1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00]
+booPul1.y=[0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00]
+booPul2.y=[1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 0e+00, 1e+00, 1e+00, 1e+00, 1e+00, 1e+00]
diff --git a/Buildings/Resources/Scripts/Dymola/Controls/OBC/CDL/Logical/Sources/Validation/Pulse.mos b/Buildings/Resources/Scripts/Dymola/Controls/OBC/CDL/Logical/Sources/Validation/Pulse.mos
index 286a19af6f2..e2e7aed0fab 100644
--- a/Buildings/Resources/Scripts/Dymola/Controls/OBC/CDL/Logical/Sources/Validation/Pulse.mos
+++ b/Buildings/Resources/Scripts/Dymola/Controls/OBC/CDL/Logical/Sources/Validation/Pulse.mos
@@ -1,2 +1,4 @@
 simulateModel("Buildings.Controls.OBC.CDL.Logical.Sources.Validation.Pulse", stopTime=5.0, method="Cvode", tolerance=1e-06, resultFile="BooleanPulse1");
-createPlot(id=1, position={15, 10, 590, 420}, y={"booPul.y"}, range={0.0, 5.0, -3.5, 3.5}, grid=true, colors={{28,108,200}});
+createPlot(id=1, subPlot=1, position={15, 10, 590, 420}, y={"booPul.y"}, range={0.0, 5.0, -3.5, 3.5}, grid=true, colors={{28,108,200}});
+createPlot(id=1, subPlot=2, position={15, 10, 590, 420}, y={"booPul1.y"}, range={0.0, 5.0, -3.5, 3.5}, grid=true, colors={{28,108,200}});
+createPlot(id=1, subPlot=3, position={15, 10, 590, 420}, y={"booPul2.y"}, range={0.0, 5.0, -3.5, 3.5}, grid=true, colors={{28,108,200}});
diff --git a/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Controls.OBC.CDL.Logical.Sources.Validation.Pulse.mos b/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Controls.OBC.CDL.Logical.Sources.Validation.Pulse.mos
index a317fd4b413..3f480c744a1 100644
--- a/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Controls.OBC.CDL.Logical.Sources.Validation.Pulse.mos
+++ b/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Controls.OBC.CDL.Logical.Sources.Validation.Pulse.mos
@@ -1,4 +1,6 @@
 compareVars :=
   {
-    "booPul.y"
+    "booPul.y",
+    "booPul1.y",
+    "booPul2.y"
   };
diff --git a/Buildings/package.mo b/Buildings/package.mo
index 742de35e80b..65869bdde6d 100644
--- a/Buildings/package.mo
+++ b/Buildings/package.mo
@@ -288,9 +288,22 @@ have been <b style=\"color:blue\">improved</b> in a
                        Buildings.Controls.OBC.CDL.Continuous.LessThreshold
     </td>
     <td valign=\"top\">Added option to specify a hysteresis, which by default is set to <i>0</i>.
-<tr><td colspan=\"2\"><b>Buildings.Fluid.HeatExchangers.RadiantSlabs</b>
+    </td>
+    </tr>
+<tr><td colspan=\"2\"><b>Buildings.Controls.OBC.CDL.Logical</b>
     </td>
 </tr>
+<tr><td valign=\"top\">Buildings.Controls.OBC.CDL.Logical.Sources.Pulse
+    </td>
+    <td valign=\"top\">Revised initial equation section to ensure an output of the block is <code>true</code> when simulation is started
+                       after boolean pulse <code>startTime</code> and the simulation start time is such that it falls within a time period during which the
+                       output is expected to be <code>true</code>.<br/>
+                       This is for <a href=\"https://github.com/lbl-srg/modelica-buildings/issues/2110\">issue 2110</a>.
+    </td>
+    </tr>
+<tr><td colspan=\"2\"><b>Buildings.Fluid.HeatExchangers.RadiantSlabs</b>
+    </td>
+    </tr>
 <tr><td valign=\"top\">Buildings.Fluid.HeatExchangers.RadiantSlabs.BaseClasses.Functions.AverageResistance
     </td>
     <td valign=\"top\">Corrected inequality test on <code>alpha</code>,
@@ -577,7 +590,7 @@ xxx
                            from control sequences.<br/>
                            This is for <a href=\"https://github.com/lbl-srg/modelica-buildings/issues/1709\">#1709</a>.
         </td>
-    </tr>
+      </tr>
     <tr><td valign=\"top\">Buildings.Controls.OBC.CDL.Discrete.TriggeredMovingMean
         </td>
         <td valign=\"top\">Block that outputs the triggered discrete moving mean of an input signal.
