diff --git a/CMS_CORE_Library/NcThermo.cs b/CMS_CORE_Library/NcThermo.cs
index fa58356..f7d3c91 100644
--- a/CMS_CORE_Library/NcThermo.cs
+++ b/CMS_CORE_Library/NcThermo.cs
@@ -730,6 +730,12 @@ namespace CMS_CORE_Library
         /// <param name="currProdCycle"></param>
         /// <returns></returns>
         public abstract CmsError PLC_RProdCycle(ref ThermoModels.ProdCycleModel currProdCycle);
+        /// <summary>
+        /// Request for mode selection via strobe
+        /// </summary>
+        /// <param name="mode">1: MAN, 2: AUTO, 3: SETUP</param>
+        /// <returns></returns>
+        public abstract CmsError PLC_WModeSel(int mode);
 
         #endregion THERMO high level data
 
diff --git a/CMS_CORE_Library/S7Net/Nc_S7Net.cs b/CMS_CORE_Library/S7Net/Nc_S7Net.cs
index 9ea14c9..a346610 100644
--- a/CMS_CORE_Library/S7Net/Nc_S7Net.cs
+++ b/CMS_CORE_Library/S7Net/Nc_S7Net.cs
@@ -2931,7 +2931,40 @@ namespace CMS_CORE_Library.S7Net
 
             return NO_ERROR;
         }
+        /// <summary>
+        /// Request for mode selection via strobe
+        /// </summary>
+        /// <param name="mode">1: MAN, 2: AUTO, 3: SETUP</param>
+        /// <returns></returns>
+        public override CmsError PLC_WModeSel(int mode)
+        {
+            // se update --> scrivo strobe comando update...
+            if (mode == 1)
+            {
+                // Call confirm update
+                CmsError cmsError = PLC_WStrobe(REQ_MODE_ACK, REQ_MODE_STROBE, 6);
+                if (cmsError.IsError())
+                    return cmsError;
+            }
+            else
+            if (mode == 2)
+            {
+                // Call confirm update
+                CmsError cmsError = PLC_WStrobe(REQ_MODE_ACK, REQ_MODE_STROBE, 5);
+                if (cmsError.IsError())
+                    return cmsError;
+            }
+            else
+            if (mode == 3)
+            {
+                // Call confirm update
+                CmsError cmsError = PLC_WStrobe(REQ_MODE_ACK, REQ_MODE_STROBE, 7);
+                if (cmsError.IsError())
+                    return cmsError;
+            }
 
+            return NO_ERROR;
+        }
 
         #endregion
 
@@ -4928,6 +4961,10 @@ namespace CMS_CORE_Library.S7Net
         internal static MEMORY_CELL PARAMETER_EDIT_ACK = new MEMORY_CELL(MEMORY_TYPE.Siemens_DB, TABLE, 0, 2);
         internal static MEMORY_CELL PARAMETER_EDIT_STROBE = new MEMORY_CELL(MEMORY_TYPE.Siemens_DB, TABLE, 2, 2);
 
+        // Mode request strobe/ack
+        internal static MEMORY_CELL REQ_MODE_ACK = new MEMORY_CELL(MEMORY_TYPE.Siemens_DB, TABLE, 0, 2);
+        internal static MEMORY_CELL REQ_MODE_STROBE = new MEMORY_CELL(MEMORY_TYPE.Siemens_DB, TABLE, 2, 2);
+
         // strobe received from PLC
         internal static MEMORY_CELL REQ_CONF_STROBE = new MEMORY_CELL(MEMORY_TYPE.Siemens_DB, TABLE, 0, 2);
         internal static MEMORY_CELL REQ_CONF_ACK = new MEMORY_CELL(MEMORY_TYPE.Siemens_DB, TABLE, 2, 2);