diff --git a/OutputConst.h b/OutputConst.h
index 69d62eb..cf8f24f 100644
--- a/OutputConst.h
+++ b/OutputConst.h
@@ -24,6 +24,7 @@ static const std::string GVAR_VER = ".VER" ;             // (string)  versione d
 static const std::string GVAR_ERR = ".ERR" ;             // (int)     codice di errore (0=ok)
 static const std::string GVAR_USETO1 = ".USETO1" ;       // (bool)    flag per utilizzo origine tavola
 static const std::string GVAR_MODAL = ".MODAL" ;         // (bool)    flag per emissione modale dei valori
+static const std::string GVAR_INCHES = ".INCHES" ;       // (bool)    flag unità di misura (true=inches, false=mm) 
 static const std::string GVAR_NUM = ".NUM" ;             // (bool)    flag numerazione 
 static const std::string GVAR_NUMTOK = ".Nt" ;           // (string)  token per numerazione 
 static const std::string GVAR_LINENBR = ".LINENBR" ;     // (int)     numero progressivo di linea
diff --git a/Processor.cpp b/Processor.cpp
index 0bc8901..8317366 100644
--- a/Processor.cpp
+++ b/Processor.cpp
@@ -519,6 +519,7 @@ Processor::OnStart( void)
   // assegno valori di default
    bOk = bOk && m_pMachine->LuaSetGlobVar( GLOB_VAR + GVAR_USETO1, false) ;
    bOk = bOk && m_pMachine->LuaSetGlobVar( GLOB_VAR + GVAR_MODAL, false) ;
+   bOk = bOk && m_pMachine->LuaSetGlobVar( GLOB_VAR + GVAR_INCHES, ! ExeUiUnitsAreMM()) ;
    bOk = bOk && m_pMachine->LuaSetGlobVar( GLOB_VAR + GVAR_NUM, false) ;
    bOk = bOk && m_pMachine->LuaSetGlobVar( GLOB_VAR + GVAR_NUMTOK, "N") ;
    bOk = bOk && m_pMachine->LuaSetGlobVar( GLOB_VAR + GVAR_LINENBR, 0) ;
diff --git a/Simulator.cpp b/Simulator.cpp
index 003301b..83c749a 100644
--- a/Simulator.cpp
+++ b/Simulator.cpp
@@ -125,6 +125,7 @@ Simulator::Start( bool bFirst)
   // Definisco tabella variabili globali
    if ( ! m_pMachine->LuaCreateGlobTable( GLOB_VAR))
       bOk = false ;
+   m_pMachine->LuaSetGlobVar( GLOB_VAR + GVAR_INCHES, ! ExeUiUnitsAreMM(), true) ;
    m_pMachine->LuaSetGlobVar( GLOB_VAR + GVAR_SIMSTEP, m_dStep, true) ;
 
   // Richiamo funzione su avvio simulazione