diff -r e8d5ab0855d3 -r 79900abdfa3c graphics/FBD_Objects.py
--- a/graphics/FBD_Objects.py	Tue Apr 05 19:06:00 2011 +0200
+++ b/graphics/FBD_Objects.py	Tue Apr 05 19:08:22 2011 +0200
@@ -188,19 +188,24 @@
     
     def GetConnectionResultType(self, connector, connectortype):
         resulttype = connectortype
+        undefined = True
         for input in self.Inputs:
             name = input.GetName()
+            undefined = undefined and input.GetType(True) == "ANY"
             if input != connector and (name.startswith("IN") or name in ["MN", "MX"]):
                 inputtype = input.GetConnectedType()
                 if resulttype is None or inputtype is not None and self.IsOfType(inputtype, resulttype):
                     resulttype = inputtype
         for output in self.Outputs:
             name = output.GetName()
+            undefined = undefined and output.GetType(True) == "ANY"
             if output != connector and name == "OUT" and not self.IsEndType(output.GetType()):
                 outputtype = output.GetConnectedType()
                 if resulttype is None or outputtype is not None and self.IsOfType(outputtype, resulttype):
                     resulttype = outputtype
-        return resulttype
+        if not undefined:
+            return resulttype
+        return "ANY"
     
     # Returns all the block connectors
     def GetConnectors(self):