diff --git a/fhem/FHEM/44_S7_ARead.pm b/fhem/FHEM/44_S7_ARead.pm
index 32336fbcd..a429fabca 100644
--- a/fhem/FHEM/44_S7_ARead.pm
+++ b/fhem/FHEM/44_S7_ARead.pm
@@ -50,6 +50,9 @@ sub S7_ARead_Define($$) {
 	my ( $name, $area, $DB, $start, $datatype );
 
 	$name     = $a[0];
+
+	AssignIoPort($hash);
+
 	if ( uc $a[2] =~ m/^[NA](\d*)/ ) {
 		my $Offset;
 		$area = "db";
@@ -210,8 +213,6 @@ sub S7_ARead_Define($$) {
 		push( @{ $modules{S7_ARead}{defptr}{$ID} }, $hash );
 	}
 
-	AssignIoPort($hash);    # logisches modul an physikalisches binden !!!
-
 	$hash->{IODev}{dirty} = 1;
 	Log3 $name, 4,
 	  "S7_ARead (" . $hash->{IODev}{NAME} . "): define $name Adress:$start";
diff --git a/fhem/FHEM/44_S7_AWrite.pm b/fhem/FHEM/44_S7_AWrite.pm
index e4a1d7d77..9963ab650 100644
--- a/fhem/FHEM/44_S7_AWrite.pm
+++ b/fhem/FHEM/44_S7_AWrite.pm
@@ -41,6 +41,8 @@ sub S7_AWrite_Define($$) {
 	my ( $name, $area, $DB, $start, $datatype, $length );
 
 	$name     = $a[0];
+
+        AssignIoPort($hash);
 	
 	if ( uc $a[2] =~ m/^[NA](\d*)/ ) {
 		my $Offset;
@@ -189,7 +191,6 @@ sub S7_AWrite_Define($$) {
 			$length = 1;
 		}
 	}
-	AssignIoPort($hash);    # logisches modul an physikalisches binden !!!
 
 	$hash->{AREA}     = $area;
 	$hash->{DB}       = $DB;