diff --git a/Test.xml b/Test.xml
index 244ae6b..7273dee 100644
--- a/Test.xml
+++ b/Test.xml
@@ -2,16 +2,16 @@
 <DeviceList xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="config.xsd">
     <Device name="example">
-        <ValueInfo type="boolean"/>
         <Port protocol="DI">
             <Pin>GPIO_2</Pin>
         </Port>
     </Device>
+    <Device name="PWM_example">
+        <Port protocol="PWM" frequency="2">
+            <Pin>GPIO_10</Pin>
+        </Port>
+    </Device>
     <Device name="sensorarray">
-        <ValueInfo type="int" unit="°C">
-            <Offset>1.2</Offset>
-            <Factor>2.5</Factor>
-        </ValueInfo>
         <Port protocol="DI">
             <Pin>GPIO_3</Pin>
             <Pin>GPIO_4</Pin>
diff --git a/config.xsd b/config.xsd
index 7d13854..7487017 100644
--- a/config.xsd
+++ b/config.xsd
@@ -6,6 +6,7 @@
         <xs:restriction base="xs:string">
             <xs:enumeration value="DI"/>
             <xs:enumeration value="DO"/>
+            <xs:enumeration value="PWM"/>
         </xs:restriction>
     </xs:simpleType>
 
@@ -18,6 +19,14 @@
         </xs:restriction>
     </xs:simpleType>
 
+    <!-- available PWM frequencies -->
+    <xs:simpleType name="FrequencyType">
+        <xs:restriction base="xs:integer">
+            <xs:minInclusive value="0"/>
+            <xs:maxInclusive value="1000"/>
+        </xs:restriction>
+    </xs:simpleType>
+
 
     <!-- available Pins -->
     <xs:simpleType name="Pin">
@@ -72,9 +81,6 @@
     <xs:element name="Device">
         <xs:complexType>
             <xs:sequence>
-                <xs:element ref="ValueInfo" 
-                    minOccurs="1" 
-                    maxOccurs="1"/>
                 <xs:element ref="Port" 
                     minOccurs="1" 
                     maxOccurs="1"/>
@@ -85,27 +91,6 @@
         </xs:complexType>
     </xs:element>
 
-    <xs:element name="ValueInfo">
-        <xs:complexType>
-            <xs:sequence>
-                <xs:element name="Offset" 
-                    type="xs:float" 
-                    minOccurs="0" 
-                    maxOccurs="1"/>
-                <xs:element name="Factor" 
-                    type="xs:float" 
-                    minOccurs="0" 
-                    maxOccurs="1"/>
-            </xs:sequence>
-            <xs:attribute name="type" 
-                type="ValueType" 
-                use="required"/>
-            <xs:attribute name="unit" 
-                type="xs:string" 
-                use="optional"/>
-        </xs:complexType>
-    </xs:element>
-
     <xs:element name="Port">
         <xs:complexType>
             <xs:sequence>
@@ -115,6 +100,7 @@
                     maxOccurs="unbounded"/>
             </xs:sequence>
             <xs:attribute name="protocol" type="ProtocolType" use="required"/>
+            <xs:attribute name="frequency" type="FrequencyType" use="optional"/>
         </xs:complexType>
     </xs:element>
 </xs:schema>
\ No newline at end of file