diff --git a/CMS_CORE_Library/S7Net/Nc_S7Net.cs b/CMS_CORE_Library/S7Net/Nc_S7Net.cs
index 71bf528..931401e 100644
--- a/CMS_CORE_Library/S7Net/Nc_S7Net.cs
+++ b/CMS_CORE_Library/S7Net/Nc_S7Net.cs
@@ -2860,6 +2860,9 @@ namespace CMS_CORE_Library.S7Net
 
             cmsError = null;
 
+            // attenzione endianness! invertire byte...
+            int fixIndex = MemIndex % 2 == 0 ? MemIndex + 1 : MemIndex - 1;
+
             if (bWrite)
             {
                 // try/catch
@@ -2867,7 +2870,7 @@ namespace CMS_CORE_Library.S7Net
                 {
                     byte[] DB_Byte = new byte[1];
                     DB_Byte[0] = Value;
-                    currPLC.WriteBytes(DataType.DataBlock, MemTable, MemIndex, DB_Byte);
+                    currPLC.WriteBytes(DataType.DataBlock, MemTable, fixIndex, DB_Byte);
                 }
                 catch
                 {
@@ -2878,7 +2881,7 @@ namespace CMS_CORE_Library.S7Net
             {
                 try
                 {
-                    var memByteRead = currPLC.ReadBytes(DataType.DataBlock, MemTable, MemIndex, 1);
+                    var memByteRead = currPLC.ReadBytes(DataType.DataBlock, MemTable, fixIndex, 1);
                     Value = memByteRead[0];
                 }
                 catch