diff --git a/edl21.sh b/edl21.sh
index 77bd1a2..3fce033 100644
--- a/edl21.sh
+++ b/edl21.sh
@@ -2,7 +2,7 @@
 # edl21.sh reads data from the EDL21 electricity meter and writes it up to a MySQL/MariaDB.
 # https://code.hw12.org/tilman/edl21
 #
-# Version 0.5 - 03.03.2019
+# Version 0.6 - 05.06.2019
 #
 # License GPL3.0 or later
 # https://code.hw12.org/tilman/edl21/src/branch/master/LICENSE
@@ -12,9 +12,9 @@ INPUT_DEV="/dev/ttyUSB0";
 stty -F $INPUT_DEV 1:0:8bd:0:3:1c:7f:15:4:5:1:0:11:13:1a:0:12:f:17:16:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0
 
 #Log file and temporary txt.
+PFAD=$(dirname "$(readlink -e "$0")");
 FILE=$PFAD"/"$DATE."txt";
 LOG=$PFAD"/edl.log";
-PFAD=$(dirname "$(readlink -e "$0")");
 
 #Database
 DB_USER="dbuser";
@@ -45,10 +45,13 @@ SEQ_180="070100010800FF";
 SEQ_280="070100020800FF";
 #Start of actual aktive power
 SEQ_PWR="070100100700FF";
-#Max possiple power value as mark of power direction
+#Max possiple power value as mark of power direction (0x7FFFFFFF)
 INOUT=2147483647;
+#Max useful power value for error handling (upper threshold in W)
+PWRMAX=10000;
 
 #Read from device
+readNcalc() {
 cat $INPUT_DEV 2>/dev/null | xxd -p -u -l 600 1> $FILE;
 
 #Delete line breaks
@@ -70,19 +73,33 @@ let STRING_280=0x${STRING_280:20:10};
 STRING_PWR=${STRING#*$SEQ_PWR};
 let STRING_PWR=0x${STRING_PWR:14:8};
 
+checkNconvert;
+}
+
+checkNconvert() {
 #Calculate direction of active power and convert in W (Watt)
 if [ $STRING_PWR -gt $INOUT ]; then
  STRING_PWR_OUT=$(echo "(4294967295 - $STRING_PWR) / (10)"|bc);
  STRING_PWR_IN=0;
+ if [ $STRING_PWR_OUT -gt $PWRMAX ]; then
+  readNcalc;
+ fi
 else
  STRING_PWR_IN=$(echo "$STRING_PWR / 10"|bc);
  STRING_PWR_OUT=0;
+ if [ $STRING_PWR_IN -gt $PWRMAX ]; then
+  readNcalc;
+ fi
 fi
 
 #Convert both active energy values in Wh (Watt hours)
 STRING_180=$(echo "scale=4; $STRING_180 / 10" |bc);
 STRING_280=$(echo "scale=4; $STRING_280 / 10" |bc);
 
+logNrock;
+}
+
+logNrock() {
 #Write to log file
 echo $DATE";"$DATE_N5M";"$STRING_180";"$STRING_280";"$STRING_PWR_IN";"$STRING_PWR_OUT >> $LOG ;
 
@@ -92,4 +109,7 @@ INSERT INTO $DB_TAB (TimeStamp,Nearest5min,zaehlerstand_in,zaehlerstand_out,acti
 EOF
 
 #Delete temporary file
-rm $FILE;
\ No newline at end of file
+rm $FILE;
+}
+
+readNcalc;