diff --git a/src/Common.share.xml b/src/Common.share.xml
index 34103526..95f6ab86 100644
--- a/src/Common.share.xml
+++ b/src/Common.share.xml
@@ -110,7 +110,9 @@
                 <TypeNumber SizeInBit="16" Type="signedInt" minInclusive="-32768" maxInclusive="32767" />
               </ParameterType>
               <ParameterType Id="%AID%_PT-ValueDpt9" Name="ValueDpt9">
-                <TypeFloat Encoding="IEEE-754 Single" minInclusive="-671088" maxInclusive="670760" />
+                <!-- ETS 5.7 allows range of -670760..670760 -->
+                <!-- max Value is below, as 7FFFh is reserved for "invalid data" in DPT 9-->
+                <TypeFloat Encoding="IEEE-754 Single" minInclusive="-671088" maxInclusive="670433" />
               </ParameterType>
               <ParameterType Id="%AID%_PT-ValueDpt12" Name="ValueDpt12">
                 <TypeNumber SizeInBit="32" Type="unsignedInt" minInclusive="0" maxInclusive="4294967295" />