diff -r d750151bd6ae -r 80eb3bde98e3 LPCBeremiz.py
--- a/LPCBeremiz.py	Mon Dec 07 10:25:33 2009 +0100
+++ b/LPCBeremiz.py	Mon Dec 07 14:43:27 2009 +0100
@@ -72,6 +72,17 @@
 #                              LPCModule Class
 #-------------------------------------------------------------------------------
 
+LOCATION_TYPES = {"I": LOCATION_VAR_INPUT,
+                  "Q": LOCATION_VAR_OUTPUT,
+                  "M": LOCATION_VAR_MEMORY}
+
+LOCATION_DIRS = dict([(dir, size) for size, dir in LOCATION_TYPES.iteritems()])
+
+LOCATION_SIZES = {}
+for size, types in LOCATIONDATATYPES.iteritems():
+    for type in types:
+        LOCATION_SIZES[type] = size
+
 def _GetModuleChildren(module):
     children = []
     for child in module["children"]:
@@ -96,9 +107,9 @@
             return child
     return None
 
-def _GetModuleVariable(module, location):
+def _GetModuleVariable(module, location, direction):
     for child in _GetModuleChildren(module):
-        if child["location"] == location:
+        if child["location"] == location and child["type"] == LOCATION_TYPES[direction]:
             return child
     return None
 
@@ -110,17 +121,6 @@
             if group["type"] == LOCATION_GROUP and child in group["children"]:
                 group["children"].remove(child)
 
-LOCATION_TYPES = {"I": LOCATION_VAR_INPUT,
-                  "Q": LOCATION_VAR_OUTPUT,
-                  "M": LOCATION_VAR_MEMORY}
-
-LOCATION_DIRS = dict([(dir, size) for size, dir in LOCATION_TYPES.iteritems()])
-
-LOCATION_SIZES = {}
-for size, types in LOCATIONDATATYPES.iteritems():
-    for type in types:
-        LOCATION_SIZES[type] = size
-
 BUS_TEXT = """/* Code generated by LPCBus plugin */
 
 /* LPCBus plugin includes */
@@ -893,7 +893,7 @@
             for child in _GetModuleChildren(module):
                 if child["name"] == name:
                     return "Error: A variable named %s already exists" % name
-                if child["location"] == location:
+                if child["location"] == location and child["type"] == LOCATION_TYPES[direction]:
                     return "Error: A variable with location %s already exists" % ".".join(map(str, location))
             _GetLastModuleGroup(module).append({"name": name, 
                                                 "location": location, 
@@ -911,7 +911,7 @@
                 return "Error: No parent found"
             variable = None
             for child in _GetModuleChildren(module):
-                if child["location"] == location:
+                if child["location"] == location and child["type"] == LOCATION_TYPES[new_direction]:
                     variable = child
                 elif child["name"] == new_name:
                     return "Error: A variable named %s already exists" % new_name
@@ -929,11 +929,11 @@
                 variable["description"] = new_description
             self.RestartTimer()
     
-        def RemoveVariable(self, parent, location):
+        def RemoveVariable(self, parent, location, direction):
             module = self.PluginRoot.GetChildByIECLocation(parent)
             if module is None:
                 return "Error: No parent found"
-            child = _GetModuleVariable(module, location)
+            child = _GetModuleVariable(module, location, direction)
             if child is None:
                 return "Error: No variable found"
             size = LOCATION_SIZES[self.PluginRoot.GetBaseType(child["IEC_type"])]