diff -r 4c130dba8366 -r 65a751cbb9b9 plcopen/plcopen.py
--- a/plcopen/plcopen.py	Mon Mar 17 16:16:06 2014 +0100
+++ b/plcopen/plcopen.py	Fri Mar 21 00:21:15 2014 +0100
@@ -2217,7 +2217,7 @@
     if self.expression == old_name:
         self.expression = new_name
 
-def _UpdateIOElementAddress(self, old_name, new_name):
+def _UpdateIOElementAddress(self, address_model, new_leading):
     self.expression = update_address(self.expression, address_model, new_leading)
 
 cls = _initElementClass("inVariable", "fbdObjects")