diff -r ec5d7af033d8 -r 2b18a72dcaf0 graphics/FBD_Objects.py
--- a/graphics/FBD_Objects.py	Wed Sep 19 15:20:59 2007 +0200
+++ b/graphics/FBD_Objects.py	Wed Sep 19 17:23:15 2007 +0200
@@ -26,7 +26,7 @@
 
 from GraphicCommons import *
 from plcopen.structures import *
-
+from plcopen.structures import IsOfType
 
 #-------------------------------------------------------------------------------
 #                         Function Block Diagram Block
@@ -138,6 +138,22 @@
     def GetInputTypes(self):
         return tuple([input.GetType() for input in self.Inputs])
     
+    def GetConnectionResultType(self, connector):
+        resulttype = None
+        for input in self.Inputs:
+            name = input.GetName()
+            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 IsOfType(inputtype, resulttype):
+                    resulttype = inputtype
+        for output in self.Outputs:
+            name = output.GetName()
+            if output != connector and name == "OUT":
+                outputtype = output.GetConnectedType()
+                if resulttype is None or outputtype is not None and IsOfType(outputtype, resulttype):
+                    resulttype = outputtype
+        return resulttype
+    
     # Returns all the block connectors 
     def GetConnectors(self):
         return {"inputs" : self.Inputs, "outputs" : self.Outputs}