diff -r 58f2e3f22934 -r 7278186a2083 plcopen/plcopen.py
--- a/plcopen/plcopen.py	Tue May 25 15:05:38 2021 +0200
+++ b/plcopen/plcopen.py	Thu Jun 10 09:40:05 2021 +0200
@@ -1393,8 +1393,8 @@
         self.interface.setcontent(vars)
     setattr(cls, "setvars", setvars)
 
-    def addpouExternalVar(self, var_type, name):
-        self.addpouVar(var_type, name, "externalVars")
+    def addpouExternalVar(self, var_type, name, **args):
+        self.addpouVar(var_type, name, "externalVars", **args)
     setattr(cls, "addpouExternalVar", addpouExternalVar)
 
     def addpouVar(self, var_type, name, var_class="localVars", location="", description="", initval=""):