diff --git a/MTC_Adapter/MTC_Adapter/AdapterGeneric.cs b/MTC_Adapter/MTC_Adapter/AdapterGeneric.cs
index 50b6e44..ed4b3ef 100644
--- a/MTC_Adapter/MTC_Adapter/AdapterGeneric.cs
+++ b/MTC_Adapter/MTC_Adapter/AdapterGeneric.cs
@@ -629,6 +629,10 @@ namespace MTC_Adapter
         /// </summary>
         public bool adpTryRestart;
         /// <summary>
+        /// Ultimo valore watchdog rilevato
+        /// </summary>
+        public bool lastWatchDog = false;
+        /// <summary>
         /// Determina se utilizzare blocchi di memoria IOT contigui (e quindi processing "monoblocco" semplificato"=
         /// </summary>
         public bool procIotMem = false;
diff --git a/MTC_Adapter/MTC_Adapter/AdapterOsai.cs b/MTC_Adapter/MTC_Adapter/AdapterOsai.cs
index 1c6e52e..3da430c 100644
--- a/MTC_Adapter/MTC_Adapter/AdapterOsai.cs
+++ b/MTC_Adapter/MTC_Adapter/AdapterOsai.cs
@@ -458,7 +458,7 @@ namespace MTC_Adapter
             {
                 inizio = DateTime.Now;
                 OsaiMemRW_Byte(W, OSAI.MemTypeWord.MW_CODE, memIndexAck, 0, ref currACK_DW);
-                if (utils.CRB("recTime")) TimingData.addResult(string.Format("W{0}-B", currACK_DW.Length), DateTime.Now.Subtract(inizio).Ticks);
+                if (utils.CRB("recTime")) TimingData.addResult(string.Format("W{0}-ACK_DW0", currACK_DW.Length), DateTime.Now.Subtract(inizio).Ticks);
             }
         }
         /// <summary>
@@ -504,7 +504,7 @@ namespace MTC_Adapter
             {
                 inizio = DateTime.Now;
                 OsaiMemRW_Byte(W, OSAI.MemTypeWord.MW_CODE, memIndexAck, memOrderStart, ref currACK_DW);
-                if (utils.CRB("recTime")) TimingData.addResult(string.Format("W{0}-B", currACK_DW.Length), DateTime.Now.Subtract(inizio).Ticks);
+                if (utils.CRB("recTime")) TimingData.addResult(string.Format("W{0}-ACK_DW0", currACK_DW.Length), DateTime.Now.Subtract(inizio).Ticks);
             }
         }
         /// <summary>
@@ -513,19 +513,25 @@ namespace MTC_Adapter
         private void sendWatchDog()
         {
             int memIndex = 0;
+            bool setFlag = false;
             byte[] retACK_DW = new byte[1];
             // 2016.10.18 aggiungo scrittura del bit di "watchdog" al primo bit della DW2... come resto tra secondi / 2
             if (utils.CRB("sendWatchDog"))
             {
                 int resto = 0;
                 Math.DivRem(DateTime.Now.Second, 2, out resto);
-                bool setFlag = resto == 0;
-                retACK_DW = utils.setBitOnStFlag(retACK_DW, setFlag, 0); // imposto primo bit!!!
-                // scrivo su area PLC
-                memIndex = 19022;
-                inizio = DateTime.Now;
-                OsaiMemRW_Byte(W, OSAI.MemTypeWord.MW_CODE, memIndex, 0, ref retACK_DW);
-                if (utils.CRB("recTime")) TimingData.addResult(string.Format("W{0}-B", retACK_DW.Length), DateTime.Now.Subtract(inizio).Ticks);
+                setFlag = resto == 0;
+                // se watchdog è cambiato lo invio, altrimenti lascio come è...
+                if (setFlag != lastWatchDog)
+                {
+                    lastWatchDog = setFlag;
+                    retACK_DW = utils.setBitOnStFlag(retACK_DW, setFlag, 0); // imposto primo bit!!!
+                    // scrivo su area PLC
+                    memIndex = 19022;
+                    inizio = DateTime.Now;
+                    OsaiMemRW_Byte(W, OSAI.MemTypeWord.MW_CODE, memIndex, 0, ref retACK_DW);
+                    if (utils.CRB("recTime")) TimingData.addResult(string.Format("W{0}-WatchDog", retACK_DW.Length), DateTime.Now.Subtract(inizio).Ticks);
+                }
             }
         }
         /// <summary>
@@ -1544,7 +1550,7 @@ namespace MTC_Adapter
         {
             // recupero vettore generale G MODE
             inizio = DateTime.Now;
-            ushort[] vettGCodes= new ushort[14];
+            ushort[] vettGCodes = new ushort[14];
             OSAI_ref.getPathGCodeMod(ref vettGCodes);
             if (utils.CRB("recTime")) TimingData.addResult("R-GCodModal", DateTime.Now.Subtract(inizio).Ticks);
 
@@ -1615,7 +1621,7 @@ namespace MTC_Adapter
 
                 parentForm.dataMonitor_2 += sb_2.ToString();
                 parentForm.dataMonitor_3 += sb_3.ToString();
-            } 
+            }
         }
 
         public override void getAxis()