diff --git a/doc/revpimodio2.netio.html b/doc/revpimodio2.netio.html
index 98bea51..3f674ae 100644
--- a/doc/revpimodio2.netio.html
+++ b/doc/revpimodio2.netio.html
@@ -122,7 +122,7 @@ Thread
 <h3 style="background-color:#FFFFFF;color:#FF0000">
 Class Attributes</h3>
 <table>
-<tr><td>__slots__</td></tr><tr><td>closed</td></tr><tr><td>name</td></tr><tr><td>reconnecting</td></tr><tr><td>timeout</td></tr>
+<tr><td>__slots__</td></tr><tr><td>closed</td></tr><tr><td>config_changed</td></tr><tr><td>name</td></tr><tr><td>reconnecting</td></tr><tr><td>timeout</td></tr>
 </table>
 <h3 style="background-color:#FFFFFF;color:#FF0000">
 Class Methods</h3>
@@ -163,6 +163,9 @@ Methods</h3>
 <td><a style="color:#0000FF" href="#NetFH.get_closed">get_closed</a></td>
 <td>Pruefen ob Verbindung geschlossen ist.</td>
 </tr><tr>
+<td><a style="color:#0000FF" href="#NetFH.get_config_changed">get_config_changed</a></td>
+<td>Pruefen ob RevPi Konfiguration geaendert wurde.</td>
+</tr><tr>
 <td><a style="color:#0000FF" href="#NetFH.get_name">get_name</a></td>
 <td>Verbindugnsnamen zurueckgeben.</td>
 </tr><tr>
@@ -307,6 +310,17 @@ Pruefen ob Verbindung geschlossen ist.
 <dd>
 True, wenn Verbindung geschlossen ist
 </dd>
+</dl><a NAME="NetFH.get_config_changed" ID="NetFH.get_config_changed"></a>
+<h3 style="background-color:#FFFFFF;color:#FF0000">
+NetFH.get_config_changed</h3>
+<b>get_config_changed</b>(<i></i>)
+<p>
+Pruefen ob RevPi Konfiguration geaendert wurde.
+</p><dl>
+<dt>Returns:</dt>
+<dd>
+True, wenn RevPi Konfiguration geaendert ist
+</dd>
 </dl><a NAME="NetFH.get_name" ID="NetFH.get_name"></a>
 <h3 style="background-color:#FFFFFF;color:#FF0000">
 NetFH.get_name</h3>
@@ -484,7 +498,7 @@ _RevPiModIO
 <h3 style="background-color:#FFFFFF;color:#FF0000">
 Class Attributes</h3>
 <table>
-<tr><td>__slots__</td></tr><tr><td>reconnecting</td></tr>
+<tr><td>__slots__</td></tr><tr><td>config_changed</td></tr><tr><td>reconnecting</td></tr>
 </table>
 <h3 style="background-color:#FFFFFF;color:#FF0000">
 Class Methods</h3>
@@ -510,6 +524,9 @@ Methods</h3>
 <td><a style="color:#0000FF" href="#RevPiNetIO.exit">exit</a></td>
 <td>Beendet mainloop() und optional autorefresh.</td>
 </tr><tr>
+<td><a style="color:#0000FF" href="#RevPiNetIO.get_config_changed">get_config_changed</a></td>
+<td>Pruefen ob RevPi Konfiguration geaendert wurde.</td>
+</tr><tr>
 <td><a style="color:#0000FF" href="#RevPiNetIO.get_jconfigrsc">get_jconfigrsc</a></td>
 <td>Laedt die piCotry Konfiguration und erstellt ein <class 'dict'>.</td>
 </tr><tr>
@@ -595,6 +612,20 @@ Beendet mainloop() und optional autorefresh.
 <dd>
 <a style="color:#0000FF" href="#RevPiModIO.exit(...)">#RevPiModIO.exit(...)</a>
 </dd>
+</dl><a NAME="RevPiNetIO.get_config_changed" ID="RevPiNetIO.get_config_changed"></a>
+<h3 style="background-color:#FFFFFF;color:#FF0000">
+RevPiNetIO.get_config_changed</h3>
+<b>get_config_changed</b>(<i></i>)
+<p>
+Pruefen ob RevPi Konfiguration geaendert wurde.
+</p><p>
+        In diesem Fall ist die Verbindung geschlossen und RevPiNetIO muss
+        neu instanziert werden.
+</p><dl>
+<dt>Returns:</dt>
+<dd>
+True, wenn RevPi Konfiguration geaendert ist
+</dd>
 </dl><a NAME="RevPiNetIO.get_jconfigrsc" ID="RevPiNetIO.get_jconfigrsc"></a>
 <h3 style="background-color:#FFFFFF;color:#FF0000">
 RevPiNetIO.get_jconfigrsc</h3>
@@ -612,6 +643,9 @@ RevPiNetIO.get_reconnecting</h3>
 <b>get_reconnecting</b>(<i></i>)
 <p>
 Interner reconnect aktiv wegen Netzwerkfehlern.
+</p><p>
+        Das Modul versucht intern die Verbindung neu herzustellen. Es ist
+        kein weiteres Zutun noetig.
 </p><dl>
 <dt>Returns:</dt>
 <dd>
diff --git a/eric-revpimodio2.api b/eric-revpimodio2.api
index 3d2c2e1..bc83c7f 100644
--- a/eric-revpimodio2.api
+++ b/eric-revpimodio2.api
@@ -190,8 +190,10 @@ revpimodio2.netio.NetFH._direct_send?5(send_bytes, recv_count)
 revpimodio2.netio.NetFH.clear_dirtybytes?4(position=None)
 revpimodio2.netio.NetFH.close?4()
 revpimodio2.netio.NetFH.closed?7
+revpimodio2.netio.NetFH.config_changed?7
 revpimodio2.netio.NetFH.flush?4()
 revpimodio2.netio.NetFH.get_closed?4()
+revpimodio2.netio.NetFH.get_config_changed?4()
 revpimodio2.netio.NetFH.get_name?4()
 revpimodio2.netio.NetFH.get_reconnecting?4()
 revpimodio2.netio.NetFH.get_timeout?4()
@@ -211,8 +213,10 @@ revpimodio2.netio.NetFH.write?4(bytebuff)
 revpimodio2.netio.NetFH?1(address, check_replace_ios, timeout=500)
 revpimodio2.netio.RevPiNetIO._create_myfh?5()
 revpimodio2.netio.RevPiNetIO._get_cpreplaceio?5()
+revpimodio2.netio.RevPiNetIO.config_changed?7
 revpimodio2.netio.RevPiNetIO.disconnect?4()
 revpimodio2.netio.RevPiNetIO.exit?4(full=True)
+revpimodio2.netio.RevPiNetIO.get_config_changed?4()
 revpimodio2.netio.RevPiNetIO.get_jconfigrsc?4()
 revpimodio2.netio.RevPiNetIO.get_reconnecting?4()
 revpimodio2.netio.RevPiNetIO.net_cleardefaultvalues?4(device=None)
diff --git a/revpimodio2/helper.py b/revpimodio2/helper.py
index 0197694..abb8bcc 100644
--- a/revpimodio2/helper.py
+++ b/revpimodio2/helper.py
@@ -289,7 +289,7 @@ class ProcimgWriter(Thread):
 
     """
 
-    __slots__ = "__dict_delay", "__eventth", "__eventqth", "__eventwork", \
+    __slots__ = "__dict_delay", "__eventth", "_eventqth", "__eventwork", \
         "_adjwait", "_eventq", "_ioerror", "_maxioerrors", "_modio", \
         "_refresh", "_work", "daemon", "lck_refresh", "newdata"
 
@@ -299,7 +299,7 @@ class ProcimgWriter(Thread):
         super().__init__()
         self.__dict_delay = {}
         self.__eventth = Thread(target=self.__exec_th)
-        self.__eventqth = queue.Queue()
+        self._eventqth = queue.Queue()
         self.__eventwork = False
         self._adjwait = 0
         self._eventq = queue.Queue()
@@ -340,7 +340,7 @@ class ProcimgWriter(Thread):
                             or regfunc.edge == FALLING and not boolor:
                         if regfunc.delay == 0:
                             if regfunc.as_thread:
-                                self.__eventqth.put(
+                                self._eventqth.put(
                                     (regfunc, io_event._name, io_event.value),
                                     False
                                 )
@@ -363,7 +363,7 @@ class ProcimgWriter(Thread):
                 for regfunc in dev._dict_events[io_event]:
                     if regfunc.delay == 0:
                         if regfunc.as_thread:
-                            self.__eventqth.put(
+                            self._eventqth.put(
                                 (regfunc, io_event._name, io_event.value),
                                 False
                             )
@@ -390,7 +390,7 @@ class ProcimgWriter(Thread):
         """Laeuft als Thread, der Events als Thread startet."""
         while self.__eventwork:
             try:
-                tup_fireth = self.__eventqth.get(timeout=1)
+                tup_fireth = self._eventqth.get(timeout=1)
                 th = EventCallback(
                     tup_fireth[0].func, tup_fireth[1], tup_fireth[2]
                 )
@@ -415,7 +415,7 @@ class ProcimgWriter(Thread):
                 self.__eventwork = value
                 if not value:
                     # Nur leeren beim deaktivieren
-                    self.__eventqth = queue.Queue()
+                    self._eventqth = queue.Queue()
                     self._eventq = queue.Queue()
                     self.__dict_delay = {}
 
@@ -533,7 +533,7 @@ class ProcimgWriter(Thread):
                             if self.__dict_delay[tup_fire] <= 0:
                                 # Verzögertes Event übernehmen und löschen
                                 if tup_fire[0].as_thread:
-                                    self.__eventqth.put(tup_fire, False)
+                                    self._eventqth.put(tup_fire, False)
                                 else:
                                     self._eventq.put(tup_fire, False)
                                 del self.__dict_delay[tup_fire]
diff --git a/revpimodio2/modio.py b/revpimodio2/modio.py
index 401b4fc..f21a5e3 100644
--- a/revpimodio2/modio.py
+++ b/revpimodio2/modio.py
@@ -850,7 +850,7 @@ class RevPiModIO(object):
                                 or regfunc.edge == RISING and io.value \
                                 or regfunc.edge == FALLING and not io.value:
                             if regfunc.as_thread:
-                                self._imgwriter.__eventqth.put(
+                                self._imgwriter._eventqth.put(
                                     (regfunc, io._name, io.value), False
                                 )
                             else:
diff --git a/revpimodio2/netio.py b/revpimodio2/netio.py
index db500ce..1c9eeb7 100644
--- a/revpimodio2/netio.py
+++ b/revpimodio2/netio.py
@@ -187,6 +187,9 @@ class NetFH(Thread):
                     "configuration on revolution pi was changed")
             else:
                 self.__replace_ios_h = byte_buff[16:]
+        except ConfigChanged:
+            so.close()
+            raise
         except Exception:
             so.close()
         else:
@@ -228,9 +231,7 @@ class NetFH(Thread):
         """Entfernt die konfigurierten Dirtybytes vom RevPi Slave.
         @param position Startposition der Dirtybytes"""
         if self.__config_changed:
-            raise ConfigChanged(
-                "configuration on revolution pi was changed"
-            )
+            raise ConfigChanged("configuration on revolution pi was changed")
         if self.__sockend.is_set():
             raise ValueError("I/O operation on closed file")
 
@@ -301,9 +302,7 @@ class NetFH(Thread):
     def flush(self):
         """Schreibpuffer senden."""
         if self.__config_changed:
-            raise ConfigChanged(
-                "configuration on revolution pi was changed"
-            )
+            raise ConfigChanged("configuration on revolution pi was changed")
         if self.__sockend.is_set():
             raise ValueError("flush of closed file")
 
@@ -337,6 +336,11 @@ class NetFH(Thread):
         @return True, wenn Verbindung geschlossen ist"""
         return self.__sockend.is_set()
 
+    def get_config_changed(self):
+        """Pruefen ob RevPi Konfiguration geaendert wurde.
+        @return True, wenn RevPi Konfiguration geaendert ist"""
+        return self.__config_changed
+
     def get_name(self):
         """Verbindugnsnamen zurueckgeben.
         @return <class 'str'> IP:PORT"""
@@ -621,6 +625,7 @@ class NetFH(Thread):
         return len(bytebuff)
 
     closed = property(get_closed)
+    config_changed = property(get_config_changed)
     name = property(get_name)
     reconnecting = property(get_reconnecting)
     timeout = property(get_timeout, set_timeout)
@@ -755,6 +760,15 @@ class RevPiNetIO(_RevPiModIO):
         except ConfigChanged:
             pass
 
+    def get_config_changed(self):
+        """Pruefen ob RevPi Konfiguration geaendert wurde.
+
+        In diesem Fall ist die Verbindung geschlossen und RevPiNetIO muss
+        neu instanziert werden.
+
+        @return True, wenn RevPi Konfiguration geaendert ist"""
+        return self._myfh.config_changed
+
     def get_jconfigrsc(self):
         """Laedt die piCotry Konfiguration und erstellt ein <class 'dict'>.
         @return <class 'dict'> der piCtory Konfiguration"""
@@ -765,6 +779,10 @@ class RevPiNetIO(_RevPiModIO):
 
     def get_reconnecting(self):
         """Interner reconnect aktiv wegen Netzwerkfehlern.
+
+        Das Modul versucht intern die Verbindung neu herzustellen. Es ist
+        kein weiteres Zutun noetig.
+
         @return True, wenn reconnect aktiv"""
         return self._myfh.reconnecting
 
@@ -835,6 +853,7 @@ class RevPiNetIO(_RevPiModIO):
                 dev._offset + dev._slc_out.start, dirtybytes
             )
 
+    config_changed = property(get_config_changed)
     reconnecting = property(get_reconnecting)