diff --git a/doc/procimgserver.html b/doc/procimgserver.html
index c4b3138..850e8b5 100644
--- a/doc/procimgserver.html
+++ b/doc/procimgserver.html
@@ -63,6 +63,9 @@ Methods</h3>
 <td><a style="color:#0000FF" href="#ProcimgServer.__init__">ProcimgServer</a></td>
 <td>Instantiiert RevPiCheckServer()-Klasse.</td>
 </tr><tr>
+<td><a style="color:#0000FF" href="#ProcimgServer.__del__">__del__</a></td>
+<td>Clean up RevPiModIO.</td>
+</tr><tr>
 <td><a style="color:#0000FF" href="#ProcimgServer.devices">devices</a></td>
 <td>Generiert Deviceliste mit Position und Namen.</td>
 </tr><tr>
@@ -104,7 +107,13 @@ XML-RPC Server
 <dd>
 Replace IOs of RevPiModIO
 </dd>
-</dl><a NAME="ProcimgServer.devices" ID="ProcimgServer.devices"></a>
+</dl><a NAME="ProcimgServer.__del__" ID="ProcimgServer.__del__"></a>
+<h3 style="background-color:#FFFFFF;color:#FF0000">
+ProcimgServer.__del__</h3>
+<b>__del__</b>(<i></i>)
+<p>
+Clean up RevPiModIO.
+</p><a NAME="ProcimgServer.devices" ID="ProcimgServer.devices"></a>
 <h3 style="background-color:#FFFFFF;color:#FF0000">
 ProcimgServer.devices</h3>
 <b>devices</b>(<i></i>)
diff --git a/eric-revpipyload.api b/eric-revpipyload.api
index a3f9d72..2d43877 100644
--- a/eric-revpipyload.api
+++ b/eric-revpipyload.api
@@ -56,6 +56,7 @@ plcsystem.RevPiPlc?1(program, arguments, pversion)
 plcsystem.__author__?9
 plcsystem.__copyright__?9
 plcsystem.__license__?9
+procimgserver.ProcimgServer.__del__?6()
 procimgserver.ProcimgServer.devices?4()
 procimgserver.ProcimgServer.ios?4(iotype)
 procimgserver.ProcimgServer.loadrevpimodio?4()
diff --git a/revpipyload/procimgserver.py b/revpipyload/procimgserver.py
index d0fe70c..ed1be3a 100644
--- a/revpipyload/procimgserver.py
+++ b/revpipyload/procimgserver.py
@@ -54,6 +54,11 @@ class ProcimgServer():
 
         proginit.logger.debug("leave ProcimgServer.__init__()")
 
+    def __del__(self):
+        """Clean up RevPiModIO."""
+        if self.rpi is not None:
+            self.rpi.cleanup()
+
     def devices(self):
         """Generiert Deviceliste mit Position und Namen.
         @return list() mit Tuple (pos, name)"""
diff --git a/revpipyload/revpipyload.py b/revpipyload/revpipyload.py
index 544e5dd..a6058a1 100755
--- a/revpipyload/revpipyload.py
+++ b/revpipyload/revpipyload.py
@@ -80,6 +80,7 @@ class RevPiPyLoad():
         self.pictoryhash = b''
         self.replaceiosmtime = 0
         self.replaceiohash = b''
+        self.replaceiofail = False
 
         # Berechtigungsmanger
         if proginit.pargs.developermode:
@@ -618,14 +619,18 @@ class RevPiPyLoad():
 
         # Zugriffsrechte prüfen (pre-check für unten)
         if self.replace_ios_config \
-                and not os.access(self.replace_ios_config, os.R_OK | os.W_OK):
-            proginit.logger.error(
-                "can not access (r/w) the replace_ios file '{0}' "
-                "using defaults".format(self.replace_ios_config)
-            )
-            self.replace_ios_config = ""
+                and not os.access(self.replace_ios_config, os.R_OK):
 
-        if not self.replace_ios_config:
+            if not self.replaceiofail:
+                proginit.logger.error(
+                    "can not access (r/w) the replace_ios file '{0}' "
+                    "using defaults".format(self.replace_ios_config)
+                )
+            self.replaceiofail = True
+        else:
+            self.replaceiofail = False
+
+        if not self.replace_ios_config or self.replaceiofail:
             # Dateipfad leer, prüfen ob es vorher einen gab
             if self.replaceiosmtime > 0 or self.replaceiohash:
                 self.replaceiosmtime = 0
@@ -644,7 +649,9 @@ class RevPiPyLoad():
                 return False
             self.replaceiohash = file_hash
 
-        return True
+            return True
+
+        return False
 
     def packapp(self, mode="tar", pictory=False):
         """Erzeugt aus dem PLC-Programm ein TAR/Zip-File.
diff --git a/setup.py b/setup.py
index 7dfa448..cdb1b3c 100644
--- a/setup.py
+++ b/setup.py
@@ -31,7 +31,7 @@ setup(
 
     scripts=["data/revpipyload"],
 
-    install_requires=["revpimodio2 >= 2.4.0"],
+    install_requires=["revpimodio2 >= 2.4.1"],
     python_requires=">=3.2",
 
     data_files=[