diff --git a/XML/config.xsd b/XML/config.xsd
index 800b53e..7d13854 100644
--- a/XML/config.xsd
+++ b/XML/config.xsd
@@ -6,8 +6,6 @@
         <xs:restriction base="xs:string">
             <xs:enumeration value="DI"/>
             <xs:enumeration value="DO"/>
-            <xs:enumeration value="AI"/>
-            <xs:enumeration value="AO"/>
         </xs:restriction>
     </xs:simpleType>