diff -r 8a1ed1959c69 -r d5b778dab4b0 PLCGenerator.py
--- a/PLCGenerator.py	Wed Apr 16 09:45:15 2008 +0200
+++ b/PLCGenerator.py	Wed Apr 16 09:46:56 2008 +0200
@@ -475,18 +475,21 @@
             self.Program = ReIndentText(body_content["value"].gettext(), 2)
         elif body_type == "FBD":
             orderedInstances = []
-            otherInstances = []
+            otherInstances = {"outVariables" : [], "block" : [], "connector" : []}
             for instance in body.getcontentInstances():
                 if isinstance(instance, (plcopen.fbdObjects_outVariable, plcopen.fbdObjects_inOutVariable, plcopen.fbdObjects_block)):
                     executionOrderId = instance.getexecutionOrderId()
                     if executionOrderId > 0:
                         orderedInstances.append((executionOrderId, instance))
-                    else:
-                        otherInstances.append(instance)
+                    elif isinstance(instance, (plcopen.fbdObjects_outVariable, plcopen.fbdObjects_inOutVariable)):
+                        otherInstances["outVariables"].append(instance)
+                    elif isinstance(instance, plcopen.fbdObjects_block):
+                        otherInstances["block"].append(instance)
                 elif isinstance(instance, plcopen.commonObjects_connector):
-                    otherInstances.append(instance)
+                    otherInstances["connector"].append(instance)
             orderedInstances.sort()
-            instances = [instance for (executionOrderId, instance) in orderedInstances] + otherInstances
+            instances = [instance for (executionOrderId, instance) in orderedInstances]
+            instances.extend(otherInstances["connector"] + otherInstances["outVariables"] + otherInstances["block"])
             for instance in instances:
                 if isinstance(instance, (plcopen.fbdObjects_outVariable, plcopen.fbdObjects_inOutVariable)):
                     var = instance.getexpression()
@@ -610,7 +613,7 @@
         connectionPointIn = divergence.getconnectionPointIn()
         if connectionPointIn:
             connections = connectionPointIn.getconnections()
-            if len(connections) == 1:
+            if connections is not None and len(connections) == 1:
                 instanceLocalId = connections[0].getrefLocalId()
                 return pou.body.getcontentInstance(instanceLocalId)
         return None
@@ -679,7 +682,7 @@
     
     def GenerateSFCStepActions(self, actionBlock, pou):
         connections = actionBlock.connectionPointIn.getconnections()
-        if len(connections) == 1:
+        if connections is not None and len(connections) == 1:
             stepLocalId = connections[0].getrefLocalId()
             step = pou.body.getcontentInstance(stepLocalId)
             self.GenerateSFCStep(step, pou)
@@ -732,7 +735,7 @@
         if transition not in self.SFCNetworks["Transitions"].keys():
             steps = []
             connections = transition.connectionPointIn.getconnections()
-            if len(connections) == 1:
+            if connections is not None and len(connections) == 1:
                 instanceLocalId = connections[0].getrefLocalId()
                 instance = pou.body.getcontentInstance(instanceLocalId)
                 if isinstance(instance, plcopen.sfcObjects_step):
@@ -836,13 +839,17 @@
             self.Program += " FROM "
             if len(transition_infos["from"]) > 1:
                 self.Program += "(%s)"%", ".join(transition_infos["from"])
-            else:
+            elif len(transition_infos["from"]) == 1:
                 self.Program += "%s"%transition_infos["from"][0]
+            else:
+                raise PLCGenException, "Not connected transition"
             self.Program += " TO "
             if len(transition_infos["to"]) > 1:
                 self.Program += "(%s)"%", ".join(transition_infos["to"])
-            else:
+            elif len(transition_infos["to"]) == 1:
                 self.Program += "%s"%transition_infos["to"][0]
+            else:
+                raise PLCGenException, "Not connected transition"
             self.Program += transition_infos["content"]
             self.Program += "  END_TRANSITION\n\n"
             for step_name in transition_infos["to"]: