--- a/lib/iec_types_all.h	Wed Jun 16 21:52:17 2010 +0200
+++ b/lib/iec_types_all.h	Tue Feb 22 15:19:41 2011 +0100
@@ -93,6 +93,7 @@
 /* Get size of type from its number */
 #define __decl_size_case(TYPENAME) \
 	case TYPENAME##_ENUM:\
+	case TYPENAME##_O_ENUM:\
 	case TYPENAME##_P_ENUM:\
 		return sizeof(TYPENAME);
 static inline USINT __get_type_enum_size(__IEC_types_enum t){