diff --git a/DirectCuts/ControlsMachineButtonUC.xaml.vb b/DirectCuts/ControlsMachineButtonUC.xaml.vb
index 949c8f9..828fedc 100644
--- a/DirectCuts/ControlsMachineButtonUC.xaml.vb
+++ b/DirectCuts/ControlsMachineButtonUC.xaml.vb
@@ -475,7 +475,7 @@ Public MustInherit Class MachineButton
                If m_CN.m_NewVariable And m_MainWindow.m_CNCommunication.m_nNCType = 2 Then
                   ' solo per Flexium
                   m_CN.DPlcVariables_WriteVariables(ENumber, EValue)
-                  If Not IsNothing(ENumber2) And Not IsNothing(EValue2) Then
+                  If Not String.IsNullOrEmpty(ENumber2) And Not String.IsNullOrEmpty(EValue2) Then
                      m_CN.DPlcVariables_WriteVariables(ENumber2, EValue2)
                   End If
                   ' altrimenti scrittura delle variabili E
diff --git a/My Project/AssemblyInfo.vb b/My Project/AssemblyInfo.vb
index 16e9762..ff00a98 100644
--- a/My Project/AssemblyInfo.vb	
+++ b/My Project/AssemblyInfo.vb	
@@ -62,5 +62,5 @@ Imports System.Windows
 ' by using the '*' as shown below:
 ' <Assembly: AssemblyVersion("1.0.*")> 
 
-<Assembly: AssemblyVersion("2.3.10.3")>
-<Assembly: AssemblyFileVersion("2.3.10.3")>
+<Assembly: AssemblyVersion("2.3.10.4")>
+<Assembly: AssemblyFileVersion("2.3.10.4")>
diff --git a/NcComm/M_Num.vb b/NcComm/M_Num.vb
index 0a1f50e..08c7416 100644
--- a/NcComm/M_Num.vb
+++ b/NcComm/M_Num.vb
@@ -1578,6 +1578,13 @@ Namespace Num
       End Sub
 
       Public Overrides Sub DPlcVariables_WriteVariables(sz_var_names As String, sz_values As String)
+         Try
+            Dim shortNumber As Short = CShort(sz_values)
+         Catch ex As Exception
+            EgtOutLog("Errore di conversione dato: " & sz_var_names)
+            EgtOutLog(ex.ToString)
+            Return
+         End Try
          Dim _ret As Short = objDPlcVariables.WriteVariables(sz_var_names, CShort(sz_values))
          If _ret <> 0 Then
             EgtOutLog("Scrittura " & sz_var_names & " fallita")