diff --git a/doc/revpimodio2.netio.html b/doc/revpimodio2.netio.html
index 3f674ae..4dd24da 100644
--- a/doc/revpimodio2.netio.html
+++ b/doc/revpimodio2.netio.html
@@ -12,7 +12,7 @@ RevPiModIO Hauptklasse fuer Netzwerkzugriff.
 <h3 style="background-color:#FFFFFF;color:#FF0000">
 Global Attributes</h3>
 <table>
-<tr><td>__author__</td></tr><tr><td>__copyright__</td></tr><tr><td>__license__</td></tr><tr><td>_sysdeldirty</td></tr><tr><td>_sysexit</td></tr><tr><td>_sysflush</td></tr><tr><td>_syspictory</td></tr><tr><td>_syspictoryh</td></tr><tr><td>_sysreplaceio</td></tr><tr><td>_sysreplaceioh</td></tr><tr><td>_syssync</td></tr>
+<tr><td>HASH_FAIL</td></tr><tr><td>__author__</td></tr><tr><td>__copyright__</td></tr><tr><td>__license__</td></tr><tr><td>_sysdeldirty</td></tr><tr><td>_sysexit</td></tr><tr><td>_sysflush</td></tr><tr><td>_syspictory</td></tr><tr><td>_syspictoryh</td></tr><tr><td>_sysreplaceio</td></tr><tr><td>_sysreplaceioh</td></tr><tr><td>_syssync</td></tr>
 </table>
 <h3 style="background-color:#FFFFFF;color:#FF0000">
 Classes</h3>
diff --git a/eric-revpimodio2.api b/eric-revpimodio2.api
index bc83c7f..28da249 100644
--- a/eric-revpimodio2.api
+++ b/eric-revpimodio2.api
@@ -185,6 +185,7 @@ revpimodio2.modio.RevPiModIO.writeprocimg?4(device=None)
 revpimodio2.modio.RevPiModIO?1(autorefresh=False, monitoring=False, syncoutputs=True, procimg=None, configrsc=None, simulator=False, debug=False, replace_io_file=None, direct_output=False)
 revpimodio2.modio.RevPiModIODriver?1(virtdev, autorefresh=False, monitoring=False, syncoutputs=True, procimg=None, configrsc=None, debug=False, replace_io_file=None, direct_output=False)
 revpimodio2.modio.RevPiModIOSelected?1(deviceselection, autorefresh=False, monitoring=False, syncoutputs=True, procimg=None, configrsc=None, simulator=False, debug=False, replace_io_file=None, direct_output=False)
+revpimodio2.netio.HASH_FAIL?7
 revpimodio2.netio.NetFH._connect?5()
 revpimodio2.netio.NetFH._direct_send?5(send_bytes, recv_count)
 revpimodio2.netio.NetFH.clear_dirtybytes?4(position=None)
diff --git a/revpimodio2/modio.py b/revpimodio2/modio.py
index f21a5e3..a87a661 100644
--- a/revpimodio2/modio.py
+++ b/revpimodio2/modio.py
@@ -359,10 +359,12 @@ class RevPiModIO(object):
             try:
                 self.io[parentio].replace_io(name=io, **dict_replace)
             except Exception as e:
-                raise RuntimeError(
-                    "replace_io_file: can not replace '{0}' with '{1}' "
-                    "| RevPiModIO message: {2}".format(parentio, io, e)
-                )
+                # NOTE: Bei Selected/Driver kann nicht geprüft werden
+                if len(self._lst_devselect) == 0:
+                    raise RuntimeError(
+                        "replace_io_file: can not replace '{0}' with '{1}' "
+                        "| RevPiModIO message: {2}".format(parentio, io, e)
+                    )
 
     def _create_myfh(self):
         """Erstellt FileObject mit Pfad zum procimg.
diff --git a/revpimodio2/netio.py b/revpimodio2/netio.py
index 1c9eeb7..0040168 100644
--- a/revpimodio2/netio.py
+++ b/revpimodio2/netio.py
@@ -28,6 +28,8 @@ _sysreplaceio = b'\x01RP\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x17'
 _sysreplaceioh = b'\x01RH\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x17'
 # Übertragene Bytes schreiben
 _sysflush = b'\x01SD\x00\x00\x00\x00\x1c\x00\x00\x00\x00\x00\x00\x00\x17'
+# Hashvalues
+HASH_FAIL = b'\xff' * 16
 
 
 class AclException(Exception):
@@ -452,6 +454,11 @@ class NetFH(Thread):
         if self.__sockend.is_set():
             raise ValueError("read of closed file")
 
+        if self.__replace_ios_h == HASH_FAIL:
+            raise RuntimeError(
+                "replace_io_file: could not read/parse over network"
+            )
+
         with self.__socklock:
             self._slavesock.send(_sysreplaceio)