diff --git a/doc/helper.html b/doc/helper.html
index e023644..a58d308 100644
--- a/doc/helper.html
+++ b/doc/helper.html
@@ -31,9 +31,6 @@ Functions</h3>
 </tr><tr>
 <td><a style="color:#0000FF" href="#refullmatch">refullmatch</a></td>
 <td>re.fullmatch wegen alter python version aus wheezy nachgebaut.</td>
-</tr><tr>
-<td><a style="color:#0000FF" href="#revpimodio_replaceio">revpimodio_replaceio</a></td>
-<td>Importiert und ersetzt IOs in RevPiModIO.</td>
 </tr>
 </table>
 <hr /><hr />
@@ -83,26 +80,5 @@ True, wenn komplett passt sonst False
 </dd>
 </dl>
 <div align="right"><a style="color:#0000FF" href="#top">Up</a></div>
-<hr /><hr />
-<a NAME="revpimodio_replaceio" ID="revpimodio_replaceio"></a>
-<h2 style="background-color:#FFFFFF;color:#0000FF">revpimodio_replaceio</h2>
-<b>revpimodio_replaceio</b>(<i>revpi, filename</i>)
-<p>
-Importiert und ersetzt IOs in RevPiModIO.
-</p><dl>
-<dt><i>revpi</i></dt>
-<dd>
-RevPiModIO Instanz
-</dd><dt><i>filename</i></dt>
-<dd>
-Dateiname der Ersetzungsdatei
-</dd>
-</dl><dl>
-<dt>Returns:</dt>
-<dd>
-True, wenn alle IOs ersetzt werden konnten
-</dd>
-</dl>
-<div align="right"><a style="color:#0000FF" href="#top">Up</a></div>
 <hr />
 </body></html>
\ No newline at end of file
diff --git a/doc/revpipyload.html b/doc/revpipyload.html
index 4ec59aa..e64899e 100644
--- a/doc/revpipyload.html
+++ b/doc/revpipyload.html
@@ -110,6 +110,12 @@ Methods</h3>
 <td><a style="color:#0000FF" href="#RevPiPyLoad._signewlogfile">_signewlogfile</a></td>
 <td>Signal handler to start new logfile.</td>
 </tr><tr>
+<td><a style="color:#0000FF" href="#RevPiPyLoad.check_pictory_changed">check_pictory_changed</a></td>
+<td>Prueft ob sich die piCtory Datei veraendert hat.</td>
+</tr><tr>
+<td><a style="color:#0000FF" href="#RevPiPyLoad.check_replace_ios_changed">check_replace_ios_changed</a></td>
+<td>Prueft ob sich die replace_ios.conf Datei veraendert hat (oder del).</td>
+</tr><tr>
 <td><a style="color:#0000FF" href="#RevPiPyLoad.packapp">packapp</a></td>
 <td>Erzeugt aus dem PLC-Programm ein TAR/Zip-File.</td>
 </tr><tr>
@@ -299,7 +305,29 @@ RevPiPyLoad._signewlogfile</h3>
 <b>_signewlogfile</b>(<i>signum, frame</i>)
 <p>
 Signal handler to start new logfile.
-</p><a NAME="RevPiPyLoad.packapp" ID="RevPiPyLoad.packapp"></a>
+</p><a NAME="RevPiPyLoad.check_pictory_changed" ID="RevPiPyLoad.check_pictory_changed"></a>
+<h3 style="background-color:#FFFFFF;color:#FF0000">
+RevPiPyLoad.check_pictory_changed</h3>
+<b>check_pictory_changed</b>(<i></i>)
+<p>
+Prueft ob sich die piCtory Datei veraendert hat.
+</p><dl>
+<dt>Returns:</dt>
+<dd>
+True, wenn veraendert wurde
+</dd>
+</dl><a NAME="RevPiPyLoad.check_replace_ios_changed" ID="RevPiPyLoad.check_replace_ios_changed"></a>
+<h3 style="background-color:#FFFFFF;color:#FF0000">
+RevPiPyLoad.check_replace_ios_changed</h3>
+<b>check_replace_ios_changed</b>(<i></i>)
+<p>
+Prueft ob sich die replace_ios.conf Datei veraendert hat (oder del).
+</p><dl>
+<dt>Returns:</dt>
+<dd>
+True, wenn veraendert wurde
+</dd>
+</dl><a NAME="RevPiPyLoad.packapp" ID="RevPiPyLoad.packapp"></a>
 <h3 style="background-color:#FFFFFF;color:#FF0000">
 RevPiPyLoad.packapp</h3>
 <b>packapp</b>(<i>mode="tar", pictory=False</i>)
diff --git a/eric-revpipyload.api b/eric-revpipyload.api
index fa7112a..a3f9d72 100644
--- a/eric-revpipyload.api
+++ b/eric-revpipyload.api
@@ -4,7 +4,6 @@ helper.__license__?9
 helper._setuprt?5(pid, evt_exit)
 helper._zeroprocimg?5()
 helper.refullmatch?4(regex, string)
-helper.revpimodio_replaceio?4(revpi, filename)
 logsystem.LogReader.closeall?4()
 logsystem.LogReader.load_applog?4(start, count)
 logsystem.LogReader.load_plclog?4(start, count)
@@ -93,6 +92,8 @@ revpipyload.RevPiPyLoad._plcthread?5()
 revpipyload.RevPiPyLoad._sigexit?5(signum, frame)
 revpipyload.RevPiPyLoad._sigloadconfig?5(signum, frame)
 revpipyload.RevPiPyLoad._signewlogfile?5(signum, frame)
+revpipyload.RevPiPyLoad.check_pictory_changed?4()
+revpipyload.RevPiPyLoad.check_replace_ios_changed?4()
 revpipyload.RevPiPyLoad.packapp?4(mode="tar", pictory=False)
 revpipyload.RevPiPyLoad.start?4()
 revpipyload.RevPiPyLoad.stop?4()
diff --git a/revpipyload/helper.py b/revpipyload/helper.py
index 34c8f81..915f546 100644
--- a/revpipyload/helper.py
+++ b/revpipyload/helper.py
@@ -5,7 +5,6 @@ __copyright__ = "Copyright (C) 2018 Sven Sager"
 __license__ = "GPLv3"
 import os
 import proginit
-from configparser import ConfigParser
 from re import match as rematch
 from subprocess import Popen, PIPE
 
@@ -118,115 +117,6 @@ def _zeroprocimg():
             )
 
 
-def revpimodio_replaceio(revpi, filename):
-    """Importiert und ersetzt IOs in RevPiModIO.
-
-    @param revpi RevPiModIO Instanz
-    @param filename Dateiname der Ersetzungsdatei
-    @return True, wenn alle IOs ersetzt werden konnten
-
-    """
-    cp = ConfigParser()
-    try:
-        with open(filename, "r") as fh:
-            cp.read_file(fh)
-    except Exception as e:
-        proginit.logger.error(
-            "could not read replace_io file '{0}' | {1}".format(filename, e)
-        )
-        return False
-
-    # Pre-check
-    lst_replace = []
-    rc = True
-    for io in cp:
-        if io == "DEFAULT":
-            continue
-
-        dict_replace = {
-            "replace": cp[io].get("replace", ""),
-            "frm": cp[io].get("frm"),
-            "bmk": cp[io].get("bmk", ""),
-            "byteorder": cp[io].get("byteorder", "little"),
-        }
-
-        if dict_replace["replace"] in revpi.io:
-
-            # Byteorder prüfen
-            if not (dict_replace["byteorder"] == "little" or
-                    dict_replace["byteorder"] == "big"):
-                proginit.logger.error(
-                    "byteorder of '{0}' must be 'little' or 'big'".format(io)
-                )
-                rc = False
-                continue
-
-            if dict_replace["frm"] == "?":
-
-                # Convert defaultvalue from config file
-                try:
-                    dict_replace["default"] = cp[io].getboolean("defaultvalue")
-                except Exception:
-                    proginit.logger.error(
-                        "could not convert '{0}' defaultvalue '{1}' to boolean"
-                        "".format(io, cp[io].get("defaultvalue"))
-                    )
-                    rc = False
-                    continue
-
-                # Get bitaddress
-                try:
-                    dict_replace["bitaddress"] = cp[io].getint("bitaddress", 0)
-                except Exception:
-                    proginit.logger.error(
-                        "could not convert '{0}' bitaddress '{1}' to integer"
-                        "".format(io, cp[io].get("bitaddress"))
-                    )
-                    rc = False
-                    continue
-
-            else:
-                # Convert defaultvalue from config file
-                try:
-                    dict_replace["default"] = cp[io].getint("defaultvalue")
-                except Exception:
-                    proginit.logger.error(
-                        "could not convert '{0}' defaultvalue '{1}' to integer"
-                        "".format(io, cp[io].get("defaultvalue"))
-                    )
-                    rc = False
-                    continue
-
-        else:
-            proginit.logger.error(
-                "can not find io '{0}' to replace with '{1}'"
-                "".format(dict_replace["replace"], io)
-            )
-            rc = False
-            continue
-
-        # Replace_IO übernehmen
-        lst_replace.append(dict_replace)
-
-    if not rc:
-        # Abbrechen, wenn IO-Verarbeitung einen Fehler hatte
-        return False
-
-    # Replace IOs
-    for dict_replace in lst_replace:
-
-        # FIXME: Hier können Fehler auftreten !!!
-
-        revpi.io[dict_replace["replace"]].replace_io(
-            io,
-            frm=dict_replace["frm"],
-            bmk=dict_replace["bmk"],
-            bit=dict_replace["bitaddress"],
-            byteorder=dict_replace["byteorder"],
-            defaultvalue=dict_replace["default"]
-        )
-
-
 def refullmatch(regex, string):
     """re.fullmatch wegen alter python version aus wheezy nachgebaut.
 
diff --git a/revpipyload/picontrolserver.py b/revpipyload/picontrolserver.py
index cb3501d..9bb4ac2 100644
--- a/revpipyload/picontrolserver.py
+++ b/revpipyload/picontrolserver.py
@@ -6,6 +6,7 @@ __license__ = "GPLv3"
 import proginit
 import socket
 from fcntl import ioctl
+from hashlib import md5
 from shared.ipaclmanager import IpAclManager
 from threading import Event, Thread
 from timeit import default_timer
@@ -385,6 +386,25 @@ class RevPiSlaveDev(Thread):
                     # End-of-Transmission character immer senden
                     self._devcon.send(b'\x04')
 
+            elif cmd == b'PH':
+                # piCtory md5 Hashwert senden (32 Byte)
+                try:
+                    with open(proginit.pargs.configrsc, "rb") as fh_pic:
+                        # Hashwert erzeugen und senden
+                        file_hash = md5(fh_pic.read())
+                        proginit.logger.debug(
+                            "send pictory hashvalue: {0}"
+                            "".format(file_hash)
+                        )
+                        self._devcon.sendall(file_hash)
+                except Exception as e:
+                    proginit.logger.error(
+                        "error on pictory hash value transfair: {0}".format(e)
+                    )
+                    break
+                else:
+                    continue
+
             elif cmd == b'RP':
                 # piCtory Konfiguration senden
                 proginit.logger.debug(
@@ -408,6 +428,27 @@ class RevPiSlaveDev(Thread):
                     # End-of-Transmission character immer senden
                     self._devcon.send(b'\x04')
 
+            elif cmd == b'RH':
+                # Replace_IOs md5 Hashwert senden (32 Byte)
+                replace_ios = proginit.conf["DEFAULT"].get("replace_ios", None)
+                try:
+                    with open(replace_ios, "rb") as fh:
+                        # Hashwert erzeugen und senden
+                        file_hash = md5(fh.read())
+                        proginit.logger.debug(
+                            "send replace_ios hashvalue: {0}"
+                            "".format(file_hash)
+                        )
+                        self._devcon.sendall(file_hash)
+                except Exception as e:
+                    proginit.logger.error(
+                        "error on replace_ios hash value transfair: {0}"
+                        "".format(e)
+                    )
+                    break
+                else:
+                    continue
+
             elif cmd == b'EX':
                 # Sauber Verbindung verlassen
                 dirty = False
@@ -429,7 +470,6 @@ class RevPiSlaveDev(Thread):
                     break
 
                 try:
-                    # FIXME: IOCTL für Dateien implementieren
                     if proginit.pargs.procimg == "/dev/piControl0":
                         # Läuft auf RevPi
                         ioctl(fh_proc, request, arg)
@@ -439,6 +479,7 @@ class RevPiSlaveDev(Thread):
                         )
                     else:
                         # Simulation
+                        # TODO: IOCTL für Dateien implementieren
                         proginit.logger.warning(
                             "ioctl {0} with {1} simulated".format(request, arg)
                         )
diff --git a/revpipyload/revpipyload.py b/revpipyload/revpipyload.py
index ea6b286..4f165c8 100755
--- a/revpipyload/revpipyload.py
+++ b/revpipyload/revpipyload.py
@@ -39,6 +39,7 @@ import signal
 import tarfile
 import zipfile
 from configparser import ConfigParser
+from hashlib import md5
 from helper import refullmatch
 from json import loads as jloads
 from shared.ipaclmanager import IpAclManager
@@ -49,7 +50,7 @@ from time import asctime
 from xmlrpc.client import Binary
 from xrpcserver import SaveXMLRPCServer
 
-min_revpimodio = "2.3.3"
+min_revpimodio = "2.4.1"
 
 
 class RevPiPyLoad():
@@ -67,8 +68,6 @@ class RevPiPyLoad():
 
         # Klassenattribute
         self._exit = True
-        self.pictorymtime = os.path.getmtime(proginit.pargs.configrsc)
-        self.replaceiosmtime = 0
         self.evt_loadconfig = Event()
         self.globalconfig = ConfigParser()
         proginit.conf = self.globalconfig
@@ -76,6 +75,12 @@ class RevPiPyLoad():
         self.xsrv = None
         self.xml_ps = None
 
+        # Dateimerker
+        self.pictorymtime = 0
+        self.pictoryhash = b''
+        self.replaceiosmtime = 0
+        self.replaceiohash = b''
+
         # Berechtigungsmanger
         if proginit.pargs.developermode:
             self.plcslaveacl = IpAclManager(minlevel=0, maxlevel=9)
@@ -233,23 +238,17 @@ class RevPiPyLoad():
         self.zeroonexit = \
             self.globalconfig["DEFAULT"].getboolean("zeroonexit", True)
 
-        # MTime für replace io übernehmen
-        mtime = 0
-        if self.replace_ios_config:
-            if os.access(self.replace_ios_config, os.R_OK | os.W_OK):
-                mtime = os.path.getmtime(self.replace_ios_config)
-            else:
-                proginit.logger.error(
-                    "can not access (r/w) the replace_ios file '{0}' "
-                    "using defaults".format(self.replace_ios_config)
-                )
-                self.replace_ios_config = ""
-
-        if self.replaceiosmtime != mtime:
-            # MQTT reload erforderlich
+        # Dateiveränderungen prüfen
+        file_changed = False
+        # Beide Funktionen müssen einmal aufgerufen werden
+        if self.check_pictory_changed():
+            file_changed = True
+        if self.check_replace_ios_changed():
+            file_changed = True
+        if file_changed:
             restart_plcmqtt = True
-
-        self.replaceiosmtime = mtime
+            restart_plcslave = True
+            restart_plcprogram = True
 
         # Konfiguration verarbeiten [MQTT]
         self.mqtt = 0
@@ -597,6 +596,56 @@ class RevPiPyLoad():
 
         proginit.logger.debug("leave RevPiPyLoad._signewlogfile()")
 
+    def check_pictory_changed(self):
+        """Prueft ob sich die piCtory Datei veraendert hat.
+        @return True, wenn veraendert wurde"""
+        mtime = os.path.getmtime(proginit.pargs.configrsc)
+        if self.pictorymtime == mtime:
+            return False
+        self.pictorymtime = mtime
+
+        with open(proginit.pargs.configrsc, "rb") as fh:
+            file_hash = md5(fh.read())
+        if self.pictoryhash == file_hash:
+            return False
+        self.pictoryhash = file_hash
+
+        return True
+
+    def check_replace_ios_changed(self):
+        """Prueft ob sich die replace_ios.conf Datei veraendert hat (oder del).
+        @return True, wenn veraendert wurde"""
+
+        # 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 = ""
+
+        if not self.replace_ios_config:
+            # Dateipfad leer, prüfen ob es vorher einen gab
+            if self.replaceiosmtime > 0 or self.replaceiohash:
+                self.replaceiosmtime = 0
+                self.replaceiohash = b''
+                return True
+
+        else:
+            mtime = os.path.getmtime(self.replace_ios_config)
+            if self.replaceiosmtime == mtime:
+                return False
+            self.replaceiosmtime = mtime
+
+            with open(self.replace_ios_config, "rb") as fh:
+                file_hash = md5(fh.read())
+            if self.replaceiohash == file_hash:
+                return False
+            self.replaceiohash = file_hash
+
+        return True
+
     def packapp(self, mode="tar", pictory=False):
         """Erzeugt aus dem PLC-Programm ein TAR/Zip-File.
 
@@ -672,6 +721,7 @@ class RevPiPyLoad():
             self.plc.start()
 
         # mainloop
+        file_changed = False
         while not self._exit:
 
             # Neue Konfiguration laden
@@ -699,21 +749,30 @@ class RevPiPyLoad():
                 if self.th_plcslave is not None:
                     self.th_plcslave.start()
 
-            # piCtory auf Veränderung prüfen
-            if self.pictorymtime != os.path.getmtime(proginit.pargs.configrsc):
+            # Dateiveränderungen prüfen mit beiden Funktionen!
+            if self.check_pictory_changed():
+                file_changed = True
                 proginit.logger.warning("piCtory configuration was changed")
-                self.pictorymtime = os.path.getmtime(proginit.pargs.configrsc)
+            if self.check_replace_ios_changed():
+                file_changed = True
+                proginit.logger.warning("replace ios file was changed")
+            if file_changed:
+                file_changed = False
+
+                # Auf Dateiveränderung reagieren
 
                 # MQTT Publisher neu laden
                 if self.mqtt and self.th_plcmqtt is not None:
                     self.th_plcmqtt.reload_revpimodio()
 
                 # FIXME: ProcImgServer muss alle Verbindungen vernichten
+                # NOTE: RevPiNetIO müsste bei Neuverbindung Hashs abfragen
 
                 # XML Prozessabbildserver neu laden
                 if self.xml_ps is not None:
                     self.xml_psstop()
                     self.xml_ps.loadrevpimodio()
+                    # Kein psstart um Reload im Client zu erzeugen
 
             self.evt_loadconfig.wait(1)
 
diff --git a/revpipyload/testsystem.py b/revpipyload/testsystem.py
index 5ef5a1f..abb23f2 100644
--- a/revpipyload/testsystem.py
+++ b/revpipyload/testsystem.py
@@ -41,7 +41,7 @@ class TestSystem:
             rpi = revpimodio2.RevPiModIO(
                 configrsc=proginit.pargs.configrsc,
                 procimg=proginit.pargs.procimg,
-                monitoring=False,
+                monitoring=True,
                 debug=True,
                 replace_io_file=file,
             )