diff --git a/IOB-WIN-FORM/Iob/Generic.Protected.cs b/IOB-WIN-FORM/Iob/Generic.Protected.cs
index 74b29d69..f4769505 100644
--- a/IOB-WIN-FORM/Iob/Generic.Protected.cs
+++ b/IOB-WIN-FORM/Iob/Generic.Protected.cs
@@ -58,6 +58,11 @@ namespace IOB_WIN_FORM.Iob
         /// </summary>
         protected int B_output;
 
+        /// <summary>
+        /// Ultimo valore B_output inviato
+        /// </summary>
+        protected int B_output_sent = -1;
+
         /// <summary>
         /// Vettore 32 BIT valori precedenti
         /// </summary>
diff --git a/IOB-WIN-FORM/Iob/Generic.Public.cs b/IOB-WIN-FORM/Iob/Generic.Public.cs
index d7b6fe8f..a32c7670 100644
--- a/IOB-WIN-FORM/Iob/Generic.Public.cs
+++ b/IOB-WIN-FORM/Iob/Generic.Public.cs
@@ -675,10 +675,19 @@ namespace IOB_WIN_FORM.Iob
                 // verifico non sia in veto invio iniziale...
                 if (queueInEnabCurr)
                 {
-                    // --> accodo (valore già formattato)!
-                    QueueIN.Enqueue(qEncodeIN);
-                    // loggo!
-                    lgDebug($"[QUEUE-IN] {qEncodeIN}");
+                    // verifico il valore encoded sia variato (x evitare doppioni successivi...)
+                    if (B_output_sent != B_output || (nReadFilt % 2 == 1))
+                    {
+                        B_output_sent = B_output;
+                        // --> accodo (valore già formattato)!
+                        QueueIN.Enqueue(qEncodeIN);
+                        // loggo!
+                        lgDebug($"[QUEUE-IN] {qEncodeIN}");
+                    }
+                    else
+                    {
+                        lgDebug($"NON accodado valore [QUEUE-IN] {qEncodeIN} | B_output_sent: {B_output_sent} | B_output: {B_output}");
+                    }
                 }
                 else
                 {
@@ -698,7 +707,7 @@ namespace IOB_WIN_FORM.Iob
                     counterSigIN = 0;
                 }
             }
-            lgDebug($"accodaSigIN 02 | nReadFilt: {nReadFilt} | counterSigIN: {counterSigIN}");
+            lgDebug($"accodaSigIN 02 | nReadFilt: {nReadFilt} | counterSigIN: {counterSigIN} | QueueIN len: {QueueIN.Count}");
         }
 
         /// <summary>