diff --git a/IOB-WIN-NEXT/IobOpc/OpcUa.cs b/IOB-WIN-NEXT/IobOpc/OpcUa.cs
index 5f90de7a..67730576 100644
--- a/IOB-WIN-NEXT/IobOpc/OpcUa.cs
+++ b/IOB-WIN-NEXT/IobOpc/OpcUa.cs
@@ -169,9 +169,9 @@ namespace IOB_WIN_NEXT.IobOpc
                 {
                     if (diKey.Contains(opcUaParams.kvDelim))
                     {
-                        int iPos = opcUaParams.keyPartCount.IndexOf(opcUaParams.kvDelim);
-                        string kRef = opcUaParams.keyPartCount.Substring(0, iPos);
-                        string varDef = opcUaParams.keyPartCount.Substring(iPos + 1);
+                        int iPos = diKey.IndexOf(opcUaParams.kvDelim);
+                        string kRef = diKey.Substring(0, iPos);
+                        string varDef = diKey.Substring(iPos + 1);
                         // recupero byte
                         byte[] bArray = getDataItemValueBytes(kRef);
                         answ = ConvFromBArr(bArray, varDef, opcUaParams.memDelim);