diff --git a/MTC_Adapter/MTC_Adapter/AdapterOsai.cs b/MTC_Adapter/MTC_Adapter/AdapterOsai.cs
index 104dc92..c366e8b 100644
--- a/MTC_Adapter/MTC_Adapter/AdapterOsai.cs
+++ b/MTC_Adapter/MTC_Adapter/AdapterOsai.cs
@@ -30,11 +30,13 @@ namespace MTC_Adapter
             {
                 try
                 {
+                    parentForm.commPlcActive = true;
                     answ = OSAI_ref.O_RW_Byte(bWrite, MemType, memIndex, memOrderStart, ref Value);
                 }
                 catch
                 { }
             }
+            parentForm.commPlcActive = false;
             return answ;
         }
         /// <summary>
@@ -52,11 +54,13 @@ namespace MTC_Adapter
             {
                 try
                 {
+                    parentForm.commPlcActive = true;
                     answ = OSAI_ref.O_RW_Word(bWrite, MemType, memIndex, ref Value);
                 }
                 catch
                 { }
             }
+            parentForm.commPlcActive = false;
             return answ;
         }
         /// <summary>
@@ -74,11 +78,13 @@ namespace MTC_Adapter
             {
                 try
                 {
+                    parentForm.commPlcActive = true;
                     answ = OSAI_ref.O_RW_DWord(bWrite, MemType, memIndex, ref Value);
                 }
                 catch
                 { }
             }
+            parentForm.commPlcActive = false;
             return answ;
         }
         /// <summary>
@@ -96,11 +102,13 @@ namespace MTC_Adapter
             {
                 try
                 {
+                    parentForm.commPlcActive = true;
                     answ = OSAI_ref.O_RW_Short(bWrite, MemType, memIndex, ref Value);
                 }
                 catch
                 { }
             }
+            parentForm.commPlcActive = false;
             return answ;
         }
         /// <summary>
@@ -118,11 +126,13 @@ namespace MTC_Adapter
             {
                 try
                 {
+                    parentForm.commPlcActive = true;
                     answ = OSAI_ref.O_RW_Integer(bWrite, MemType, memIndex, ref Value);
                 }
                 catch
                 { }
             }
+            parentForm.commPlcActive = false;
             return answ;
         }
         /// <summary>
@@ -140,11 +150,13 @@ namespace MTC_Adapter
             {
                 try
                 {
+                    parentForm.commPlcActive = true;
                     answ = OSAI_ref.O_RW_Double(bWrite, MemType, memIndex, ref Value);
                 }
                 catch
                 { }
             }
+            parentForm.commPlcActive = false;
             return answ;
         }
 
@@ -175,8 +187,10 @@ namespace MTC_Adapter
             prevPosAxis = new double[adpConf.nAxis];
             prevDirAxis = new int[adpConf.nAxis];
 
+            parentForm.commPlcActive = true;
             OSAI_ref = (OSAI)Runtime.NC;
             if (utils.CRB("verbose")) lg.Info(string.Format("Generato oggetto OSAI_ref da CMSCncLib:{0}{1}", Environment.NewLine, OSAI_ref.Descrizione));
+            parentForm.commPlcActive = false;
 
             // disconnetto e connetto...
             if (utils.CRB("verbose")) lg.Info("OSAI: tryDisconnect");
@@ -517,9 +531,11 @@ namespace MTC_Adapter
             sb1.AppendLine(string.Format("POWER {0}: | EmStop:{1:N3} | ProcSel: {2}", mPower.Value, mEStop.Value, mProcSel.Value));
 
             // leggo dati globali...
+            parentForm.commPlcActive = true;
             inizio = DateTime.Now;
             OSAI_ref.O_GetNcInfo1(ref allNcData);
             if (utils.CRB("recTime")) TimingData.addResult("R-NcInfo", DateTime.Now.Subtract(inizio).Ticks);
+            parentForm.commPlcActive = false;
 
             // recupero speed e feed...
             FeedRate = Convert.ToInt32(allNcData.realfeed);
@@ -838,10 +854,12 @@ namespace MTC_Adapter
         public override void getPath()
         {
             // recupero vettore generale G MODE
+            parentForm.commPlcActive = true;
             inizio = DateTime.Now;
             ushort[] vettGCodes = new ushort[14];
             OSAI_ref.getPathGCodeMod(ref vettGCodes);
             if (utils.CRB("recTime")) TimingData.addResult("R-GCodModal", DateTime.Now.Subtract(inizio).Ticks);
+            parentForm.commPlcActive = false;
 
             // attenzione: il vettore contiene come campi "vuoti" il valore MAX di USHort (16bit) ovvero 2^16 -1 (base 0) --> 65535
             string GCodAttivi = "";
@@ -907,6 +925,7 @@ namespace MTC_Adapter
             // mostro assi in DataMonitor......
             StringBuilder sb = new StringBuilder();
 
+            parentForm.commPlcActive = true;
             inizio = DateTime.Now;
             // inizializzo x numero assi...
             CMSCncLib.OPENcontrol.GETINTDATA[] posAssiTgt = new CMSCncLib.OPENcontrol.GETINTDATA[currAdpConf.nAxis];
@@ -914,6 +933,7 @@ namespace MTC_Adapter
             OSAI_ref.getAllAxisPos(1, ref posAssiTgt);
             OSAI_ref.getAllAxisPos(2, ref posAssi);
             if (utils.CRB("recTime")) TimingData.addResult("R-AXIS_POS", DateTime.Now.Subtract(inizio).Ticks);
+            parentForm.commPlcActive = false;
 
             // nuova posizione (per calcoli)
             double newPos = 0;