diff --git a/silecs-model/src/xml/DeploySchema.xsd b/silecs-model/src/xml/DeploySchema.xsd
index 173e0f2ca9c006f391b256b3ee0e20f39eeaba62..8577a26d20960a62d01dcf30ff82d3fbbbf67011 100644
--- a/silecs-model/src/xml/DeploySchema.xsd
+++ b/silecs-model/src/xml/DeploySchema.xsd
@@ -607,8 +607,8 @@
     <xs:simpleType name="DeviceNameType">
         <xs:restriction base="NonIdentifierType">
             <xs:minLength value="1" />
-            <xs:maxLength value="30" />
-            <!-- In FESA the deviceName is restricted to max. 30 characters -->
+            <xs:maxLength value="30" /> <!-- In FESA the deviceName is restricted to max. 30 characters -->
+            <xs:pattern value="[_A-Za-z]+[_A-Za-z0-9]*"/> <!-- Needs to fulfill plc-specific language standards -->
         </xs:restriction>
     </xs:simpleType>