diff --git a/data/etc/avahi/services/revpipyload.service b/data/etc/avahi/services/revpipyload.service
index 666966a..280aaad 100644
--- a/data/etc/avahi/services/revpipyload.service
+++ b/data/etc/avahi/services/revpipyload.service
@@ -4,6 +4,6 @@
     <name replace-wildcards="yes">%h</name>
     <service protocol="ipv4">
         <type>_revpipyload._tcp</type>
-        <port>55239</port>
+        <port>55123</port>
     </service>
 </service-group>
diff --git a/data/etc/revpipyload/revpipyload.conf b/data/etc/revpipyload/revpipyload.conf
index 3731ac9..8bc228d 100644
--- a/data/etc/revpipyload/revpipyload.conf
+++ b/data/etc/revpipyload/revpipyload.conf
@@ -3,11 +3,12 @@ autoreload = 1
 autostart = 1
 plcworkdir = /var/lib/revpipyload
 plcprogram = program.py
-plcarguments =
+plcarguments = 
 plcuid = 1000
 plcgid = 1000
 plcslave = 0
 pythonversion = 3
+rtlevel = 1
 xmlrpc = 0
 zeroonerror = 0
 zeroonexit = 0
diff --git a/revpipyload/plcsystem.py b/revpipyload/plcsystem.py
index bc3ae2c..d2a0037 100644
--- a/revpipyload/plcsystem.py
+++ b/revpipyload/plcsystem.py
@@ -41,6 +41,7 @@ class RevPiPlc(Thread):
         self.exitcode = None
         self.gid = 65534
         self.uid = 65534
+        self.rtlevel = 1
         self.zeroonerror = False
         self.zeroonexit = False
 
@@ -103,19 +104,32 @@ class RevPiPlc(Thread):
         """Fuehrt PLC-Programm aus und ueberwacht es."""
         proginit.logger.debug("enter RevPiPlc.run()")
 
-        if self._pversion == 2:
-            lst_proc = shlex.split("/usr/bin/env python2 -u {} {}".format(
-                self._program, self._arguments
-            ))
-        else:
-            lst_proc = shlex.split("/usr/bin/env python3 -u {} {}".format(
-                self._program, self._arguments
-            ))
+        # Befehlstliste aufbauen
+        lst_proc = shlex.split("/usr/bin/env {} -OO -u {} {}".format(
+            "python2" if self._pversion == 2 else "python3",
+            self._program,
+            self._arguments
+        ))
 
         # Prozess erstellen
         proginit.logger.info("start plc program {}".format(self._program))
         self._procplc = self._spopen(lst_proc)
 
+        # RealTime Scheduler nutzen
+        if self.rtlevel > 0 and self._procplc.poll() is None:
+            proginit.logger.info(
+                "set scheduler profile of pid {}".format(self._procplc.pid)
+            )
+            ec = os.system("/usr/bin/env chrt -p {} {}".format(
+                20 if self.rtlevel == 2 else 1,
+                self._procplc.pid
+            ))
+            if ec != 0:
+                proginit.logger.error(
+                    "could not set scheduler profile of pid {}"
+                    "".format(self._procplc.pid)
+                )
+
         # LogWriter starten und Logausgaben schreiben
         if self._plw is not None:
             self._plw.logline("-" * 55)
diff --git a/revpipyload/procimgserver.py b/revpipyload/procimgserver.py
index 627c801..a2cb0b7 100644
--- a/revpipyload/procimgserver.py
+++ b/revpipyload/procimgserver.py
@@ -13,7 +13,7 @@ IO-Check bei Inbetriebname durchzufuehren.
 """
 import pickle
 import proginit
-import revpimodio
+import revpimodio2
 from xmlrpc.client import Binary
 
 
@@ -47,7 +47,6 @@ class ProcimgServer():
             "ps_devices": self.devices,
             "ps_inps": lambda: self.ios("inp"),
             "ps_outs": lambda: self.ios("out"),
-            "ps_mems": lambda: self.ios("mem"),
             "ps_values": self.values,
         }
         self.xmlwritefuncs = {
@@ -62,7 +61,7 @@ class ProcimgServer():
         """Generiert Deviceliste mit Position und Namen.
         @return list() mit Tuple (pos, name)"""
         return [
-            (dev.position, dev.name) for dev in self.rpi.devices
+            (dev.position, dev.name) for dev in self.rpi.device
         ]
 
     def ios(self, type):
@@ -70,16 +69,14 @@ class ProcimgServer():
         @param type IO Typ inp/out
         @return pickled dict()"""
         dict_ios = {}
-        for dev in self.rpi.devices:
+        for dev in self.rpi.device:
             dict_ios[dev.position] = []
 
             # IO Typen auswerten
             if type == "inp":
-                lst_io = dev.get_inps()
+                lst_io = dev.get_inputs()
             elif type == "out":
-                lst_io = dev.get_outs()
-            elif type == "mem":
-                lst_io = dev.get_mems()
+                lst_io = dev.get_outputs()
             else:
                 lst_io = []
 
@@ -87,7 +84,7 @@ class ProcimgServer():
                 dict_ios[dev.position].append([
                     io.name,
                     1 if io._bitlength == 1 else int(io._bitlength / 8),
-                    io.slc_address.start + dev.offset,
+                    io._slc_address.start + dev.offset,
                     io.bmk,
                     io._bitaddress,
                 ])
@@ -100,9 +97,9 @@ class ProcimgServer():
         if self.rpi is not None:
             self.rpi.cleanup()
 
-        proginit.logger.debug("create revpimodio class")
+        proginit.logger.debug("create revpimodio2 object")
         try:
-            self.rpi = revpimodio.RevPiModIO(
+            self.rpi = revpimodio2.RevPiModIO(
                 configrsc=proginit.pargs.configrsc,
                 procimg=proginit.pargs.procimg
             )
@@ -111,8 +108,8 @@ class ProcimgServer():
             proginit.logger.error("piCtory configuration not loadable")
             return False
 
-        self.rpi.devices.syncoutputs(device=0)
-        proginit.logger.debug("created revpimodio class")
+        self.rpi.syncoutputs(device=0)
+        proginit.logger.debug("created revpimodio2 object")
         return True
 
     def setvalue(self, device, io, value):
@@ -135,30 +132,31 @@ class ProcimgServer():
         if type(value) == Binary:
             value = value.data
 
-        self.rpi.devices.syncoutputs(device=device)
+        self.rpi.syncoutputs(device=device)
 
         try:
             # Neuen Wert übernehmen
             if type(value) == bytes or type(value) == bool:
-                self.rpi.devices[device][io].set_value(value)
+                self.rpi.io[io].set_value(value)
             else:
-                self.rpi.devices[device][io].set_value(
+                self.rpi.io[io].set_value(
                     value.to_bytes(
-                        self.rpi.devices[device][io].length, byteorder="little"
+                        self.rpi.io[io].length,
+                        byteorder=self.rpi.io[io].byteorder
                     )
                 )
         except Exception as e:
             return [device, io, False, str(e)]
 
-        self.rpi.devices.writeprocimg(device=device)
+        self.rpi.writeprocimg(device=device)
         return [device, io, True, ""]
 
     def values(self):
         """Liefert Prozessabbild an Client.
         @return Binary() bytes or None"""
-        if self.rpi.devices.readprocimg() and self.rpi.devices.syncoutputs():
+        if self.rpi.readprocimg() and self.rpi.syncoutputs():
             bytebuff = b''
-            for dev in self.rpi.devices:
+            for dev in self.rpi.device:
                 bytebuff += bytes(dev)
             return Binary(bytebuff)
         else:
diff --git a/revpipyload/revpipyload.py b/revpipyload/revpipyload.py
index e14b899..8703150 100755
--- a/revpipyload/revpipyload.py
+++ b/revpipyload/revpipyload.py
@@ -123,6 +123,8 @@ class RevPiPyLoad():
             int(self.globalconfig["DEFAULT"].get("plcslave", 0))
         self.pythonver = \
             int(self.globalconfig["DEFAULT"].get("pythonversion", 3))
+        self.rtlevel = \
+            int(self.globalconfig["DEFAULT"].get("rtlevel", 1))
         self.xmlrpc = \
             int(self.globalconfig["DEFAULT"].get("xmlrpc", 0))
         self.zeroonerror = \
@@ -142,7 +144,7 @@ class RevPiPyLoad():
             self.xsrv = SimpleXMLRPCServer(
                 (
                     "",
-                    int(self.globalconfig["DEFAULT"].get("xmlrpcport", 55239))
+                    int(self.globalconfig["DEFAULT"].get("xmlrpcport", 55123))
                 ),
                 logRequests=False,
                 allow_none=True
@@ -170,10 +172,10 @@ class RevPiPyLoad():
             except:
                 self.xml_ps = None
                 proginit.logger.warning(
-                    "can not load revpimodio module. maybe its not installed "
-                    "or an old version (required at least 0.15.0). if you "
+                    "can not load revpimodio2 module. maybe its not installed "
+                    "or an old version (required at least 2.0.5). if you "
                     "like to use the process monitor feature, update/install "
-                    "revpimodio: 'apt-get install python3-revpimodio'"
+                    "revpimodio2: 'apt-get install python3-revpimodio2'"
                 )
 
             # XML Modus 2 Einstellungen lesen und Programm herunterladen
@@ -236,6 +238,7 @@ class RevPiPyLoad():
         th_plc.autoreload = self.autoreload
         th_plc.gid = int(self.globalconfig["DEFAULT"].get("plcgid", 65534))
         th_plc.uid = int(self.globalconfig["DEFAULT"].get("plcuid", 65534))
+        th_plc.rtlevel = self.rtlevel
         th_plc.zeroonerror = self.zeroonerror
         th_plc.zeroonexit = self.zeroonexit
 
@@ -395,9 +398,8 @@ class RevPiPyLoad():
         dc["plcarguments"] = self.plcarguments
         dc["plcslave"] = self.plcslave
         dc["pythonversion"] = self.pythonver
+        dc["rtlevel"] = self.rtlevel
         dc["xmlrpc"] = self.xmlrpc
-        dc["xmlrpcport"] = \
-            self.globalconfig["DEFAULT"].get("xmlrpcport", 55239)
         dc["zeroonerror"] = self.zeroonerror
         dc["zeroonexit"] = self.zeroonexit
         return dc
@@ -567,8 +569,8 @@ class RevPiPyLoad():
             "plcarguments": ".*",
             "plcslave": "[01]",
             "pythonversion": "[23]",
+            "rtlevel": "[0-2]",
             "xmlrpc": "[0-3]",
-            "xmlrpcport": "[0-9]{,5}",
             "zeroonerror": "[01]",
             "zeroonexit": "[01]"
         }
diff --git a/setup.py b/setup.py
index e365178..37cae22 100644
--- a/setup.py
+++ b/setup.py
@@ -31,7 +31,7 @@ setup(
 
     scripts=["data/revpipyload"],
 
-    install_requires=["revpimodio"],
+    install_requires=["revpimodio2"],
 
     data_files=[
         ("/etc/avahi/services", [
@@ -56,9 +56,13 @@ setup(
     "Tool zur Laufzeit überwacht werden.",
 
     classifiers=[
+        "Development Status :: 5 - Production/Stable",
+        "Environment :: No Input/Output (Daemon)",
+        "Intended Audience :: Manufacturing",
         "License :: OSI Approved :: "
         "GNU Lesser General Public License v3 (LGPLv3)",
         "Operating System :: POSIX :: Linux",
+        "Topic :: System :: Operating System",
     ],
     cmdclass={"install_egg_info": MyEggInfo},
 )
diff --git a/stdeb.cfg b/stdeb.cfg
index b6c3754..191693a 100644
--- a/stdeb.cfg
+++ b/stdeb.cfg
@@ -1,6 +1,6 @@
 [DEFAULT]
 Debian-Version: 1
-Depends3: python3-revpimodio (>= 0.11.0)
+Depends3: python3-revpimodio2 (>= 2.0.0)
 Package: revpipyload
 Suite: stable
 X-Python3-Version: >=3.2