diff -r d91356480df9 -r 431f4ef34bde editors/SFCViewer.py
--- a/editors/SFCViewer.py	Wed Nov 30 14:27:18 2016 +0300
+++ b/editors/SFCViewer.py	Thu Dec 01 16:40:49 2016 +0300
@@ -31,55 +31,57 @@
 from graphics.GraphicCommons import SELECTION_DIVERGENCE, \
     SELECTION_CONVERGENCE, SIMULTANEOUS_DIVERGENCE, SIMULTANEOUS_CONVERGENCE, EAST, NORTH, WEST, SOUTH
 
-type = [SELECTION_DIVERGENCE, SELECTION_CONVERGENCE, SIMULTANEOUS_DIVERGENCE, SIMULTANEOUS_CONVERGENCE]
-divergence = dict(zip(type,["SELECTION_DIVERGENCE", "SELECTION_CONVERGENCE",\
-                            "SIMULTANEOUS_DIVERGENCE", "SIMULTANEOUS_CONVERGENCE"]))
 SFC_Objects = (SFC_Step, SFC_ActionBlock, SFC_Transition, SFC_Divergence, SFC_Jump)
 
-StandardRules = {
-    # The key of this dict is a block that user try to connect,
-    # and the value is a list of blocks, that can be connected with the current block.
-    "SFC_Step" :                 ["SFC_ActionBlock",
-                                  "SFC_Transition",
-                                  "SELECTION_DIVERGENCE",
-                                  "SIMULTANEOUS_CONVERGENCE"],
-
-    "SFC_ActionBlock" :          ["SFC_Step"],
-
-    "SFC_Transition" :           ["SFC_Step",
-                                  "SELECTION_CONVERGENCE",
-                                  "SIMULTANEOUS_DIVERGENCE",
-                                  "SFC_Jump",
-                                  "FBD_Block",
-                                  "FBD_Variable"
-                                  "LD_Contact",
-                                  "LD_PowerRail",
-                                  "LD_Coil"],
-
-    "SELECTION_DIVERGENCE" :     ["SFC_Transition"],
-
-    "SELECTION_CONVERGENCE" :    ["SFC_Step",
-                                  "SFC_Jump"],
-
-    "SIMULTANEOUS_DIVERGENCE" :  ["SFC_Step"],
-
-    "SIMULTANEOUS_CONVERGENCE" : ["SFC_Transition"],
-
-    "SFC_Jump" :                 [],
-
-    "FBD_Block" :                ["SFC_Transition"],
-
-    "FBD_Variable" :             ["SFC_Transition"],
-
-    "LD_Contact" :               ["SFC_Transition"],
-
-    "LD_PowerRail" :             ["SFC_Transition"],
-
-    "LD_Coil" :                  ["SFC_Transition"]
-                }
 
 class SFC_Viewer(Viewer):
     
+    SFC_StandardRules = {
+        # The key of this dict is a block that user try to connect,
+        # and the value is a list of blocks, that can be connected with the current block
+        # and with directions of connection
+        "SFC_Step": [("SFC_ActionBlock", EAST),
+                     ("SFC_Transition", SOUTH),
+                     (SELECTION_DIVERGENCE, SOUTH),
+                     (SIMULTANEOUS_CONVERGENCE, SOUTH)],
+
+        "SFC_ActionBlock": [("SFC_Step", EAST)],
+
+        "SFC_Transition": [("SFC_Step", SOUTH),
+                           (SELECTION_CONVERGENCE, SOUTH),
+                           (SIMULTANEOUS_DIVERGENCE, SOUTH),
+                           ("SFC_Jump", SOUTH),
+                           ("FBD_Block", EAST),
+                           ("FBD_Variable", EAST),
+                           ("FBD_Connector", EAST),
+                           ("LD_Contact", EAST),
+                           ("LD_PowerRail", EAST),
+                           ("LD_Coil", EAST)],
+
+        SELECTION_DIVERGENCE: [("SFC_Transition", SOUTH)],
+
+        SELECTION_CONVERGENCE: [("SFC_Step", SOUTH),
+                                  ("SFC_Jump", SOUTH)],
+
+        SIMULTANEOUS_DIVERGENCE: [("SFC_Step", SOUTH)],
+
+        SIMULTANEOUS_CONVERGENCE: [("SFC_Transition", SOUTH)],
+
+        "SFC_Jump": [],
+
+        "FBD_Block": [("SFC_Transition", WEST)],
+
+        "FBD_Variable": [("SFC_Transition", WEST)],
+
+        "FBD_Connector": [("SFC_Transition", WEST)],
+
+        "LD_Contact": [("SFC_Transition", WEST)],
+
+        "LD_PowerRail": [("SFC_Transition", WEST)],
+
+        "LD_Coil": [("SFC_Transition", WEST)]
+    }
+
     def __init__(self, parent, tagname, window, controler, debug = False, instancepath = ""):
         Viewer.__init__(self, parent, tagname, window, controler, debug, instancepath)
         self.CurrentLanguage = "SFC"
@@ -335,20 +337,23 @@
     def GetBlockName(self, block):
         blockName = block.__class__.__name__
         if blockName == "SFC_Divergence":
-            blockName = divergence[block.Type]
+            blockName = block.Type
         return blockName
 
     # This method check the IEC 61131-3 compatibility between two SFC blocks
     def BlockCompatibility(self,startblock = None, endblock = None, direction = None):
         if startblock!= None and endblock != None and (isinstance(startblock,SFC_Objects)\
                                                                or isinstance(endblock,SFC_Objects)):
-            # Full "StandardRules" table would be simmetrical and
+            # Full "SFC_StandardRules" table would be symmetrical and
             # to avoid duplicate records and minimize the table only upper part is defined.
             if (direction == SOUTH or direction == EAST):
                 startblock, endblock = endblock, startblock
             start = self.GetBlockName(startblock)
             end = self.GetBlockName(endblock)
-            return end in StandardRules[start]
+            for val in self.SFC_StandardRules[start]:
+                if end in val:
+                    return True
+            return False
         return True
 
 #-------------------------------------------------------------------------------