diff -r dda34e671700 -r a2ab363f9e90 tests/python/plc.xml
--- a/tests/python/plc.xml	Tue Aug 21 13:05:23 2018 +0300
+++ b/tests/python/plc.xml	Fri Aug 24 13:25:05 2018 +0300
@@ -1,7 +1,7 @@
 <?xml version='1.0' encoding='utf-8'?>
 <project xmlns="http://www.plcopen.org/xml/tc6_0201" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xhtml="http://www.w3.org/1999/xhtml" xsi:schemaLocation="http://www.plcopen.org/xml/tc6_0201">
   <fileHeader companyName="" productName="Beremiz" productVersion="0.0" creationDateTime="2008-12-14T16:21:19" contentDescription="This example shows many features in Beremiz:&#10;&#10;   1. How to implement python extensions.&#10;   2. How to implement basic C extension.&#10;   3. How to use C code in IEC POUs.&#10;   4. How to call C functions from python code.&#10;   5. How to avoid race conditions between IEC, C and python code.&#10;   6. How to convert betweet different IEC types.&#10;"/>
-  <contentHeader name="Beremiz Python Support Tests" modificationDateTime="2016-10-12T14:15:35">
+  <contentHeader name="Beremiz Python Support Tests" modificationDateTime="2018-08-24T13:17:44">
     <coordinateInfo>
       <pageSize x="1024" y="1024"/>
       <fbd>
@@ -323,14 +323,14 @@
               <expression>pytest_var2</expression>
             </inOutVariable>
             <block localId="8" width="125" height="80" typeName="python_eval" instanceName="Block1" executionOrderId="0">
-              <position x="650" y="515"/>
+              <position x="650" y="545"/>
               <inputVariables>
                 <variable formalParameter="TRIG">
                   <connectionPointIn>
                     <relPosition x="0" y="35"/>
                     <connection refLocalId="7" formalParameter="OUT">
-                      <position x="650" y="550"/>
-                      <position x="285" y="550"/>
+                      <position x="650" y="580"/>
+                      <position x="285" y="580"/>
                       <position x="285" y="480"/>
                       <position x="250" y="480"/>
                     </connection>
@@ -340,8 +340,8 @@
                   <connectionPointIn>
                     <relPosition x="0" y="65"/>
                     <connection refLocalId="9">
-                      <position x="650" y="580"/>
-                      <position x="585" y="580"/>
+                      <position x="650" y="610"/>
+                      <position x="585" y="610"/>
                     </connection>
                   </connectionPointIn>
                 </variable>
@@ -361,28 +361,28 @@
               </outputVariables>
             </block>
             <inVariable localId="9" height="30" width="290" executionOrderId="0" negated="false">
-              <position x="295" y="565"/>
+              <position x="295" y="595"/>
               <connectionPointOut>
                 <relPosition x="290" y="15"/>
               </connectionPointOut>
               <expression>'sys.stdout.write("FBID :"+str(FBID)+"\n")'</expression>
             </inVariable>
             <inVariable localId="11" height="30" width="290" executionOrderId="0" negated="false">
-              <position x="295" y="685"/>
+              <position x="295" y="735"/>
               <connectionPointOut>
                 <relPosition x="290" y="15"/>
               </connectionPointOut>
               <expression>'PLCBinary.Simple_C_Call(5678)'</expression>
             </inVariable>
             <block localId="12" width="125" height="80" typeName="python_eval" instanceName="Block2" executionOrderId="0">
-              <position x="650" y="637"/>
+              <position x="650" y="687"/>
               <inputVariables>
                 <variable formalParameter="TRIG">
                   <connectionPointIn>
                     <relPosition x="0" y="33"/>
                     <connection refLocalId="7" formalParameter="OUT">
-                      <position x="650" y="670"/>
-                      <position x="285" y="670"/>
+                      <position x="650" y="720"/>
+                      <position x="285" y="720"/>
                       <position x="285" y="480"/>
                       <position x="250" y="480"/>
                     </connection>
@@ -392,8 +392,8 @@
                   <connectionPointIn>
                     <relPosition x="0" y="63"/>
                     <connection refLocalId="11">
-                      <position x="650" y="700"/>
-                      <position x="585" y="700"/>
+                      <position x="650" y="750"/>
+                      <position x="585" y="750"/>
                     </connection>
                   </connectionPointIn>
                 </variable>
@@ -413,21 +413,21 @@
               </outputVariables>
             </block>
             <inVariable localId="14" height="30" width="290" executionOrderId="0" negated="false">
-              <position x="290" y="810"/>
+              <position x="290" y="885"/>
               <connectionPointOut>
                 <relPosition x="290" y="15"/>
               </connectionPointOut>
               <expression>'MyPythonFunc(42)'</expression>
             </inVariable>
             <block localId="15" width="125" height="80" typeName="python_eval" instanceName="Block3" executionOrderId="0">
-              <position x="650" y="762"/>
+              <position x="650" y="837"/>
               <inputVariables>
                 <variable formalParameter="TRIG">
                   <connectionPointIn>
                     <relPosition x="0" y="33"/>
                     <connection refLocalId="7" formalParameter="OUT">
-                      <position x="650" y="795"/>
-                      <position x="285" y="795"/>
+                      <position x="650" y="870"/>
+                      <position x="285" y="870"/>
                       <position x="285" y="480"/>
                       <position x="250" y="480"/>
                     </connection>
@@ -437,8 +437,8 @@
                   <connectionPointIn>
                     <relPosition x="0" y="63"/>
                     <connection refLocalId="14">
-                      <position x="650" y="825"/>
-                      <position x="580" y="825"/>
+                      <position x="650" y="900"/>
+                      <position x="580" y="900"/>
                     </connection>
                   </connectionPointIn>
                 </variable>
@@ -464,16 +464,16 @@
               </content>
             </comment>
             <block localId="17" width="80" height="120" typeName="MUX" executionOrderId="0">
-              <position x="1065" y="715"/>
+              <position x="1065" y="790"/>
               <inputVariables>
                 <variable formalParameter="K">
                   <connectionPointIn>
                     <relPosition x="0" y="30"/>
                     <connection refLocalId="18">
-                      <position x="1065" y="745"/>
-                      <position x="1040" y="745"/>
-                      <position x="1040" y="735"/>
-                      <position x="1015" y="735"/>
+                      <position x="1065" y="820"/>
+                      <position x="1040" y="820"/>
+                      <position x="1040" y="810"/>
+                      <position x="1022" y="810"/>
                     </connection>
                   </connectionPointIn>
                 </variable>
@@ -481,8 +481,8 @@
                   <connectionPointIn>
                     <relPosition x="0" y="50"/>
                     <connection refLocalId="5" formalParameter="RESULT">
-                      <position x="1065" y="765"/>
-                      <position x="905" y="765"/>
+                      <position x="1065" y="840"/>
+                      <position x="905" y="840"/>
                       <position x="905" y="465"/>
                       <position x="775" y="465"/>
                     </connection>
@@ -492,10 +492,10 @@
                   <connectionPointIn>
                     <relPosition x="0" y="70"/>
                     <connection refLocalId="8" formalParameter="RESULT">
-                      <position x="1065" y="785"/>
-                      <position x="890" y="785"/>
-                      <position x="890" y="580"/>
-                      <position x="775" y="580"/>
+                      <position x="1065" y="860"/>
+                      <position x="890" y="860"/>
+                      <position x="890" y="610"/>
+                      <position x="775" y="610"/>
                     </connection>
                   </connectionPointIn>
                 </variable>
@@ -503,10 +503,10 @@
                   <connectionPointIn>
                     <relPosition x="0" y="90"/>
                     <connection refLocalId="12" formalParameter="RESULT">
-                      <position x="1065" y="805"/>
-                      <position x="875" y="805"/>
-                      <position x="875" y="700"/>
-                      <position x="775" y="700"/>
+                      <position x="1065" y="880"/>
+                      <position x="875" y="880"/>
+                      <position x="875" y="750"/>
+                      <position x="775" y="750"/>
                     </connection>
                   </connectionPointIn>
                 </variable>
@@ -514,8 +514,8 @@
                   <connectionPointIn>
                     <relPosition x="0" y="110"/>
                     <connection refLocalId="15" formalParameter="RESULT">
-                      <position x="1065" y="825"/>
-                      <position x="775" y="825"/>
+                      <position x="1065" y="900"/>
+                      <position x="775" y="900"/>
                     </connection>
                   </connectionPointIn>
                 </variable>
@@ -530,12 +530,12 @@
               </outputVariables>
             </block>
             <outVariable localId="19" height="35" width="125" executionOrderId="0" negated="false">
-              <position x="1235" y="730"/>
+              <position x="1235" y="805"/>
               <connectionPointIn>
                 <relPosition x="0" y="15"/>
                 <connection refLocalId="17" formalParameter="OUT">
-                  <position x="1235" y="745"/>
-                  <position x="1145" y="745"/>
+                  <position x="1235" y="820"/>
+                  <position x="1145" y="820"/>
                 </connection>
               </connectionPointIn>
               <expression>pytest_var1</expression>
@@ -550,7 +550,7 @@
                       <position x="1070" y="415"/>
                       <position x="1040" y="415"/>
                       <position x="1040" y="405"/>
-                      <position x="1010" y="405"/>
+                      <position x="1017" y="405"/>
                     </connection>
                   </connectionPointIn>
                 </variable>
@@ -569,8 +569,8 @@
                     <connection refLocalId="8" formalParameter="ACK">
                       <position x="1070" y="455"/>
                       <position x="805" y="455"/>
-                      <position x="805" y="550"/>
-                      <position x="775" y="550"/>
+                      <position x="805" y="580"/>
+                      <position x="775" y="580"/>
                     </connection>
                   </connectionPointIn>
                 </variable>
@@ -580,8 +580,8 @@
                     <connection refLocalId="12" formalParameter="ACK">
                       <position x="1070" y="475"/>
                       <position x="820" y="475"/>
-                      <position x="820" y="670"/>
-                      <position x="775" y="670"/>
+                      <position x="820" y="720"/>
+                      <position x="775" y="720"/>
                     </connection>
                   </connectionPointIn>
                 </variable>
@@ -591,8 +591,8 @@
                     <connection refLocalId="15" formalParameter="ACK">
                       <position x="1070" y="495"/>
                       <position x="835" y="495"/>
-                      <position x="835" y="795"/>
-                      <position x="775" y="795"/>
+                      <position x="835" y="870"/>
+                      <position x="775" y="870"/>
                     </connection>
                   </connectionPointIn>
                 </variable>
@@ -606,10 +606,10 @@
                 </variable>
               </outputVariables>
             </block>
-            <inVariable localId="22" height="30" width="65" executionOrderId="0" negated="false">
+            <inVariable localId="22" height="30" width="72" executionOrderId="0" negated="false">
               <position x="945" y="390"/>
               <connectionPointOut>
-                <relPosition x="65" y="15"/>
+                <relPosition x="72" y="15"/>
               </connectionPointOut>
               <expression>mux1_sel</expression>
             </inVariable>
@@ -700,44 +700,44 @@
               </connectionPointOut>
               <expression>10</expression>
             </inVariable>
-            <comment localId="30" height="75" width="465">
-              <position x="50" y="945"/>
+            <comment localId="30" height="105" width="465">
+              <position x="50" y="925"/>
               <content>
                 <xhtml:p><![CDATA[You will be ready to use beremiz with C and Python when you will understand why "FromInput" is equal  to 75.
 Happy hacking! ]]></xhtml:p>
               </content>
             </comment>
-            <comment localId="31" height="60" width="345">
+            <comment localId="31" height="90" width="345">
               <position x="295" y="485"/>
               <content>
                 <xhtml:p><![CDATA[Sleep here is bad. It blocks other py_eval instances. Whith a wxGlade GUI, GUI freeze for a second.]]></xhtml:p>
               </content>
             </comment>
-            <comment localId="6" height="60" width="345">
-              <position x="295" y="600"/>
+            <comment localId="6" height="80" width="345">
+              <position x="295" y="630"/>
               <content>
                 <xhtml:p><![CDATA[Prints FBID to stdout of PLC runtime. FBID is a unique reference to py_eval instance.]]></xhtml:p>
               </content>
             </comment>
-            <comment localId="10" height="60" width="345">
-              <position x="295" y="720"/>
+            <comment localId="10" height="85" width="345">
+              <position x="295" y="770"/>
               <content>
                 <xhtml:p><![CDATA[Simple_C_Call is declared in C_File "1.x:c_code". See python ctypes manual for details on typing.]]></xhtml:p>
               </content>
             </comment>
-            <comment localId="32" height="105" width="235">
+            <comment localId="32" height="145" width="235">
               <position x="25" y="505"/>
               <content>
                 <xhtml:p><![CDATA[Fast clock, at least faster that sleep(1). See what happens when python takes time to answer : PLC continues.]]></xhtml:p>
               </content>
             </comment>
-            <outVariable localId="33" height="30" width="130" executionOrderId="0" negated="false">
+            <outVariable localId="33" height="30" width="133" executionOrderId="0" negated="false">
               <position x="580" y="1564"/>
               <connectionPointIn>
                 <relPosition x="0" y="16"/>
                 <connection refLocalId="35" formalParameter="OUT">
                   <position x="580" y="1580"/>
-                  <position x="370" y="1580"/>
+                  <position x="371" y="1580"/>
                 </connection>
               </connectionPointIn>
               <expression>Test_BCD_RESULT</expression>
@@ -749,7 +749,7 @@
               </connectionPointOut>
               <expression>Test_BCD</expression>
             </inVariable>
-            <block localId="35" width="105" height="60" typeName="BCD_TO_UINT" executionOrderId="0">
+            <block localId="35" width="106" height="60" typeName="BCD_TO_UINT" executionOrderId="0">
               <position x="265" y="1539"/>
               <inputVariables>
                 <variable formalParameter="IN">
@@ -766,7 +766,7 @@
               <outputVariables>
                 <variable formalParameter="OUT">
                   <connectionPointOut>
-                    <relPosition x="105" y="41"/>
+                    <relPosition x="106" y="41"/>
                   </connectionPointOut>
                 </variable>
               </outputVariables>
@@ -1163,16 +1163,16 @@
               </connectionPointIn>
               <expression>fefvsd</expression>
             </outVariable>
-            <comment localId="53" height="65" width="420">
+            <comment localId="53" height="80" width="420">
               <position x="75" y="2160"/>
               <content>
                 <xhtml:p><![CDATA[Shows global variables access from resource configuration (res_pytest) and from project's configuration.]]></xhtml:p>
               </content>
             </comment>
-            <inVariable localId="18" height="30" width="65" executionOrderId="0" negated="false">
-              <position x="950" y="720"/>
-              <connectionPointOut>
-                <relPosition x="65" y="15"/>
+            <inVariable localId="18" height="30" width="72" executionOrderId="0" negated="false">
+              <position x="950" y="795"/>
+              <connectionPointOut>
+                <relPosition x="72" y="15"/>
               </connectionPointOut>
               <expression>mux2_sel</expression>
             </inVariable>
@@ -1194,14 +1194,14 @@
                 <xhtml:p><![CDATA[Shows access variable defined in python extension. ]]></xhtml:p>
               </content>
             </comment>
-            <inVariable localId="66" height="30" width="130" executionOrderId="0" negated="false">
+            <inVariable localId="66" height="30" width="137" executionOrderId="0" negated="false">
               <position x="60" y="1685"/>
               <connectionPointOut>
-                <relPosition x="130" y="15"/>
+                <relPosition x="137" y="15"/>
               </connectionPointOut>
               <expression>Test_BCD_WRONG</expression>
             </inVariable>
-            <block localId="67" width="105" height="100" typeName="BCD_TO_UINT" executionOrderId="0">
+            <block localId="67" width="106" height="100" typeName="BCD_TO_UINT" executionOrderId="0">
               <position x="265" y="1620"/>
               <inputVariables>
                 <variable formalParameter="EN">
@@ -1218,7 +1218,7 @@
                       <position x="255" y="1700"/>
                       <position x="345" y="1700"/>
                       <position x="345" y="1700"/>
-                      <position x="190" y="1700"/>
+                      <position x="197" y="1700"/>
                     </connection>
                   </connectionPointIn>
                 </variable>
@@ -1227,28 +1227,28 @@
               <outputVariables>
                 <variable formalParameter="ENO">
                   <connectionPointOut>
-                    <relPosition x="105" y="40"/>
+                    <relPosition x="106" y="40"/>
                   </connectionPointOut>
                 </variable>
                 <variable formalParameter="OUT">
                   <connectionPointOut>
-                    <relPosition x="105" y="80"/>
-                  </connectionPointOut>
-                </variable>
-              </outputVariables>
-            </block>
-            <outVariable localId="68" height="30" width="185" executionOrderId="0" negated="false">
+                    <relPosition x="106" y="80"/>
+                  </connectionPointOut>
+                </variable>
+              </outputVariables>
+            </block>
+            <outVariable localId="68" height="30" width="196" executionOrderId="0" negated="false">
               <position x="580" y="1685"/>
               <connectionPointIn>
                 <relPosition x="0" y="15"/>
                 <connection refLocalId="67" formalParameter="OUT">
                   <position x="580" y="1700"/>
-                  <position x="370" y="1700"/>
+                  <position x="371" y="1700"/>
                 </connection>
               </connectionPointIn>
               <expression>Test_BCD_WRONG_RESULT</expression>
             </outVariable>
-            <comment localId="69" height="135" width="375">
+            <comment localId="69" height="165" width="375">
               <position x="795" y="1590"/>
               <content>
                 <xhtml:p><![CDATA[Incorrect BCD number is not converted to UINT.
@@ -1273,7 +1273,7 @@
               </connectionPointIn>
               <expression>Test_BCD_CONVERTED</expression>
             </outVariable>
-            <comment localId="71" height="170" width="680">
+            <comment localId="71" height="215" width="680">
               <position x="35" y="30"/>
               <content>
                 <xhtml:p><![CDATA[This example shows many features in Beremiz: