diff --git a/fhem/webfrontend/pgm2/01_FHEMWEB.pm b/fhem/webfrontend/pgm2/01_FHEMWEB.pm
index 12921f63b..c6ea184e5 100755
--- a/fhem/webfrontend/pgm2/01_FHEMWEB.pm
+++ b/fhem/webfrontend/pgm2/01_FHEMWEB.pm
@@ -87,21 +87,20 @@ FW_Define($$)
            ($global && $global ne "global"));
 
   $hash->{STATE} = "Initialized";
-  $hash->{PORT} = IO::Socket::INET->new(
+  $hash->{SERVERSOCKET} = IO::Socket::INET->new(
           Proto     => 'tcp',
           LocalHost => (($global && $global eq "global") ? undef : "localhost"),
           LocalPort => $port,
           Listen    => 10,
           ReuseAddr => 1);
 
-  return "Can't open server port at $port: $!" if(!$hash->{PORT});
+  return "Can't open server port at $port: $!" if(!$hash->{SERVERSOCKET});
 
-  $hash->{FD} = $hash->{PORT}->fileno();
+  $hash->{FD} = $hash->{SERVERSOCKET}->fileno();
+  $hash->{PORT} = $port;
 
   $selectlist{"$name.$port"} = $hash;
-  $hash->{SERVERSOCKET} = 1;
   Log(2, "FHEMWEB port $port opened");
-
   return undef;
 }
 
@@ -110,8 +109,19 @@ sub
 FW_Undef($$)
 {
   my ($hash, $arg) = @_;
-  close($hash->{CD})   if(defined($hash->{CD}));    # Clients
-  close($hash->{PORT}) if(defined($hash->{PORT}));  # Server
+  my $name = $hash->{NAME};
+
+  return undef if($hash->{INUSE});
+
+  if(defined($hash->{CD})) {                   # Clients
+    close($hash->{CD});
+    delete($selectlist{$hash->{NAME}});
+  }
+  if(defined($hash->{SERVERSOCKET})) {          # Server
+    close($hash->{SERVERSOCKET});
+    $name = $name . "." . $hash->{PORT};
+    delete($selectlist{$name});
+  }
   return undef;
 }
 
@@ -120,11 +130,11 @@ sub
 FW_Read($)
 {
   my ($hash) = @_;
+  my $name = $hash->{NAME};
 
   if($hash->{SERVERSOCKET}) {   # Accept and create a child
 
-    my @clientinfo = $hash->{PORT}->accept();
-    my $name = $hash->{NAME};
+    my @clientinfo = $hash->{SERVERSOCKET}->accept();
     my $ll = GetLogLevel($name,4);
 
     if(!@clientinfo) {
@@ -162,8 +172,8 @@ FW_Read($)
   my $ret = sysread($hash->{CD}, $buf, 1024);
 
   if(!defined($ret) || $ret <= 0) {
-    my $r = CommandDelete(undef, $hash->{NAME});
-    Log($ll, "Connection closed for $hash->{NAME}");
+    my $r = CommandDelete(undef, $name);
+    Log($ll, "Connection closed for $name");
     return;
   }
 
@@ -175,9 +185,17 @@ FW_Read($)
   my ($mode, $arg, $method) = split(" ", $lines[0]);
   $hash->{BUF} = "";
 
-  Log($ll, "HTTP $hash->{NAME} GET $arg");
+  Log($ll, "HTTP $name GET $arg");
+  $hash->{INUSE} = 1;
+
   my $cacheable = FW_AnswerCall($arg);
 
+  delete($hash->{INUSE});
+  if(!$selectlist{$name}) {             # removed by rereadcfg, reinsert
+    $selectlist{$name} = $hash;
+    $defs{$name} = $hash;
+  }
+
   my $c = $hash->{CD};
   my $l = length($__RET);
   my $e = ($cacheable? ("Expires: ".localtime(time()+900)." GMT\r\n") : "");
diff --git a/fhem/webfrontend/pgm2/cul_em.gplot b/fhem/webfrontend/pgm2/cul_em.gplot
index e15fe0165..7ae328e61 100644
--- a/fhem/webfrontend/pgm2/cul_em.gplot
+++ b/fhem/webfrontend/pgm2/cul_em.gplot
@@ -1,7 +1,8 @@
 ############################
 # Display the power reported by the EM1010
 # Corresponding FileLog definition:
-# define ememlog FileLog /var/log/fhem/emem-%Y.log emem:power.*
+# define ememlog FileLog /var/log/fhem/em-%Y.log emem:power.*
+# define emwzlog FileLog /var/log/fhem/em-%Y.log emwz:power.*
 
 set terminal png transparent size <SIZE> crop
 set output '<OUT>.png'
diff --git a/fhem/webfrontend/pgm2/cul_emem.gplot b/fhem/webfrontend/pgm2/cul_emem.gplot
new file mode 100644
index 000000000..152109146
--- /dev/null
+++ b/fhem/webfrontend/pgm2/cul_emem.gplot
@@ -0,0 +1,32 @@
+############################
+# Display the power reported by the EM1000FM received bei CUL
+
+#set terminal png transparent size <SIZE> crop
+set terminal png size <SIZE> crop
+set output '<OUT>.png'
+set xdata time
+set timefmt "%Y-%m-%d_%H:%M:%S"
+set xlabel "Energiemonitor EM1000EM"
+
+set title '<TL>'
+set ylabel "Power (kW)"
+set y2label "Power (kWh)"
+set grid
+set ytics
+set y2tics
+set logscale y
+set logscale y2
+set format y "%.1f"
+set format y2 "%.1f"
+
+#FileLog 8::0:
+#FileLog 10::0:
+
+
+plot \
+  "< awk '/5MIN:/ {print $1, $8}' <IN>"\
+     using 1:2 axes x1y2 title 'kWh' with lines lw 1,\
+  "< awk '/TOP:/ {print $1, $10}' <IN>"\
+     using 1:2 axes x1y1 title 'Spitze kW' with lines lw 2\
+
+