diff -r 045df8ecc8b3 -r 87eb184414bd etherlab/runtime_etherlab.py
--- a/etherlab/runtime_etherlab.py	Sat Sep 29 17:12:44 2018 +0300
+++ b/etherlab/runtime_etherlab.py	Sat Sep 29 17:39:21 2018 +0300
@@ -1,9 +1,12 @@
 import os
+import signal
 import subprocess
 import ctypes
 from threading import Thread
 import time
 import re
+
+import runtime.PLCObject as PLCObject
 from runtime.loglevels import LogLevelsDict
 
 SDOAnswered = PLCBinary.SDOAnswered
@@ -111,7 +114,7 @@
 def _runtime_etherlab_cleanup():
     global KMSGPollThread, StopKMSGThread, SDOProc, SDOThread
     try:
-        os.kill(SDOProc.pid, SIGTERM)
+        os.kill(SDOProc.pid, signal.SIGTERM)
     except Exception:
         pass
     SDOThread = None