diff --git a/IOB-WIN-NEXT/IobGeneric.cs b/IOB-WIN-NEXT/IobGeneric.cs
index b3fcab8f..c07211dc 100644
--- a/IOB-WIN-NEXT/IobGeneric.cs
+++ b/IOB-WIN-NEXT/IobGeneric.cs
@@ -3273,6 +3273,11 @@ namespace IOB_WIN_NEXT
                     {
                         readSemafori(ref currDispData);
                     }
+                    else
+                    {
+                        // forzo lettura OK
+                        currDispData.semIn = Semaforo.SV;
+                    }
                 }
                 else
                 {