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py_ext/pous.xml
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Fri, 10 Aug 2018 17:45:33 +0300
changeset 2278 a3ac46366b86
parent 1399 4c130dba8366
child 3707 3c60c78dfa5d
permissions -rw-r--r--
Dirty fix for error '_object_has_no_attribute_'getSlave' in EtherCAT extension

traceback:
File "/home/developer/WorkData/PLC/beremiz/beremiz/IDEFrame.py", line 1433, in OnPouSelectedChanged
window.RefreshView()
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/ConfigEditor.py", line 837, in RefreshView
self.RefreshProcessVariables()
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/ConfigEditor.py", line 886, in RefreshProcessVariables
slaves = self.Controler.GetSlaves(**self.CurrentNodesFilter)
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/EthercatMaster.py", line 341, in GetSlaves
for slave in self.Config.getConfig().getSlave():
<type 'exceptions.AttributeError'>:_'lxml.etree._Element'_object_has_no_attribute_'getSlave'

Steps to reproduce problem:

- Add new EtherCAT master
- Add new EthercatNode to the master
- double click on


this is looks like dirty hack to fix strange problem with initial[0]
changing its type after returning from _init_ method to lxml.etree._Element
As a result all methods generated by class factory are lost.

For example, in function initMethod initial[0].__class__ points to
xmlclass.xmlclass.Config. After map(self.append, initial)
self.Config.__class__ is 'xmlclass.xmlclass.Config' as well.
But after returning from initMethod (_init) in CreateElement
self.Config.__class__ has changed to lxml.etree._Element.


I've noticed similar behavior if copy/deepcopy is used for any child
of etree.ElementBase. See simple example below.
[-------------------------------------------------------------]
#!/usr/bin/python

from __future__ import print_function
from lxml import etree
import copy

class DefaultElementClass(etree.ElementBase):
def getLocalTag(self):
return etree.QName(self.tag).localname


def printInformation(x):
print(x, x.__class__, "getLocalTag" in dir(x))


a = DefaultElementClass()
printInformation(a)

#
printInformation(copy.copy(a))
printInformation(copy.deepcopy(a))
[-------------------------------------------------------------] 
<?xml version='1.0' encoding='utf-8'?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.plcopen.org/xml/tc6_0201" xmlns:xhtml="http://www.w3.org/1999/xhtml" xsi:schemaLocation="http://www.plcopen.org/xml/tc6_0201">
  <fileHeader companyName="Beremiz" productName="Beremiz" productVersion="0.0" creationDateTime="2008-12-14T16:53:26"/>
  <contentHeader name="Beremiz non-standard POUs library" modificationDateTime="2014-03-17T08:07:24">
    <coordinateInfo>
      <fbd>
        <scaling x="0" y="0"/>
      </fbd>
      <ld>
        <scaling x="0" y="0"/>
      </ld>
      <sfc>
        <scaling x="0" y="0"/>
      </sfc>
    </coordinateInfo>
  </contentHeader>
  <types>
    <dataTypes/>
    <pous>
      <pou name="python_eval" pouType="functionBlock">
        <interface>
          <inputVars>
            <variable name="TRIG">
              <type>
                <BOOL/>
              </type>
            </variable>
            <variable name="CODE">
              <type>
                <string/>
              </type>
            </variable>
          </inputVars>
          <outputVars>
            <variable name="ACK">
              <type>
                <BOOL/>
              </type>
            </variable>
            <variable name="RESULT">
              <type>
                <string/>
              </type>
            </variable>
          </outputVars>
          <localVars>
            <variable name="STATE">
              <type>
                <DWORD/>
              </type>
            </variable>
            <variable name="BUFFER">
              <type>
                <string/>
              </type>
            </variable>
            <variable name="PREBUFFER">
              <type>
                <string/>
              </type>
            </variable>
            <variable name="TRIGM1">
              <type>
                <BOOL/>
              </type>
            </variable>
            <variable name="TRIGGED">
              <type>
                <BOOL/>
              </type>
            </variable>
          </localVars>
        </interface>
        <body>
          <ST>
            <xhtml:p><![CDATA[{extern void __PythonEvalFB(int, PYTHON_EVAL*);__PythonEvalFB(0, data__);}]]></xhtml:p>
          </ST>
        </body>
      </pou>
      <pou name="python_poll" pouType="functionBlock">
        <interface>
          <inputVars>
            <variable name="TRIG">
              <type>
                <BOOL/>
              </type>
            </variable>
            <variable name="CODE">
              <type>
                <string/>
              </type>
            </variable>
          </inputVars>
          <outputVars>
            <variable name="ACK">
              <type>
                <BOOL/>
              </type>
            </variable>
            <variable name="RESULT">
              <type>
                <string/>
              </type>
            </variable>
          </outputVars>
          <localVars>
            <variable name="STATE">
              <type>
                <DWORD/>
              </type>
            </variable>
            <variable name="BUFFER">
              <type>
                <string/>
              </type>
            </variable>
            <variable name="PREBUFFER">
              <type>
                <string/>
              </type>
            </variable>
            <variable name="TRIGM1">
              <type>
                <BOOL/>
              </type>
            </variable>
            <variable name="TRIGGED">
              <type>
                <BOOL/>
              </type>
            </variable>
          </localVars>
        </interface>
        <body>
          <ST>
            <xhtml:p><![CDATA[{extern void __PythonEvalFB(int, PYTHON_EVAL*);__PythonEvalFB(1,(PYTHON_EVAL*)(void*)data__);}]]></xhtml:p>
          </ST>
        </body>
      </pou>
      <pou name="python_gear" pouType="functionBlock">
        <interface>
          <inputVars>
            <variable name="N">
              <type>
                <UINT/>
              </type>
            </variable>
            <variable name="TRIG">
              <type>
                <BOOL/>
              </type>
            </variable>
            <variable name="CODE">
              <type>
                <string/>
              </type>
            </variable>
          </inputVars>
          <outputVars>
            <variable name="ACK">
              <type>
                <BOOL/>
              </type>
            </variable>
            <variable name="RESULT">
              <type>
                <string/>
              </type>
            </variable>
          </outputVars>
          <localVars>
            <variable name="py_eval">
              <type>
                <derived name="python_eval"/>
              </type>
            </variable>
            <variable name="COUNTER">
              <type>
                <UINT/>
              </type>
            </variable>
          </localVars>
        </interface>
        <body>
          <FBD>
            <block localId="1" width="125" height="110" typeName="python_eval" instanceName="py_eval">
              <position x="525" y="580"/>
              <inputVariables>
                <variable formalParameter="TRIG">
                  <connectionPointIn>
                    <relPosition x="0" y="40"/>
                    <connection refLocalId="7" formalParameter="OUT">
                      <position x="525" y="620"/>
                      <position x="495" y="620"/>
                      <position x="495" y="575"/>
                      <position x="465" y="575"/>
                    </connection>
                  </connectionPointIn>
                </variable>
                <variable formalParameter="CODE">
                  <connectionPointIn>
                    <relPosition x="0" y="85"/>
                    <connection refLocalId="4">
                      <position x="525" y="665"/>
                      <position x="370" y="665"/>
                    </connection>
                  </connectionPointIn>
                </variable>
              </inputVariables>
              <inOutVariables/>
              <outputVariables>
                <variable formalParameter="ACK">
                  <connectionPointOut>
                    <relPosition x="125" y="40"/>
                  </connectionPointOut>
                </variable>
                <variable formalParameter="RESULT">
                  <connectionPointOut>
                    <relPosition x="125" y="85"/>
                  </connectionPointOut>
                </variable>
              </outputVariables>
            </block>
            <inVariable localId="2" height="35" width="25">
              <position x="435" y="270"/>
              <connectionPointOut>
                <relPosition x="25" y="15"/>
              </connectionPointOut>
              <expression>N</expression>
            </inVariable>
            <inVariable localId="3" height="35" width="55">
              <position x="275" y="585"/>
              <connectionPointOut>
                <relPosition x="55" y="15"/>
              </connectionPointOut>
              <expression>TRIG</expression>
            </inVariable>
            <inVariable localId="4" height="35" width="55">
              <position x="315" y="650"/>
              <connectionPointOut>
                <relPosition x="55" y="15"/>
              </connectionPointOut>
              <expression>CODE</expression>
            </inVariable>
            <outVariable localId="5" height="35" width="45">
              <position x="740" y="605"/>
              <connectionPointIn>
                <relPosition x="0" y="15"/>
                <connection refLocalId="1" formalParameter="ACK">
                  <position x="740" y="620"/>
                  <position x="650" y="620"/>
                </connection>
              </connectionPointIn>
              <expression>ACK</expression>
            </outVariable>
            <outVariable localId="6" height="35" width="75">
              <position x="740" y="650"/>
              <connectionPointIn>
                <relPosition x="0" y="15"/>
                <connection refLocalId="1" formalParameter="RESULT">
                  <position x="740" y="665"/>
                  <position x="650" y="665"/>
                </connection>
              </connectionPointIn>
              <expression>RESULT</expression>
            </outVariable>
            <block localId="7" width="80" height="65" typeName="AND">
              <position x="385" y="545"/>
              <inputVariables>
                <variable formalParameter="IN1">
                  <connectionPointIn>
                    <relPosition x="0" y="30"/>
                    <connection refLocalId="13" formalParameter="OUT">
                      <position x="385" y="575"/>
                      <position x="335" y="575"/>
                      <position x="335" y="455"/>
                      <position x="625" y="455"/>
                      <position x="625" y="285"/>
                      <position x="615" y="285"/>
                    </connection>
                  </connectionPointIn>
                </variable>
                <variable formalParameter="IN2">
                  <connectionPointIn>
                    <relPosition x="0" y="55"/>
                    <connection refLocalId="3">
                      <position x="385" y="600"/>
                      <position x="330" y="600"/>
                    </connection>
                  </connectionPointIn>
                </variable>
              </inputVariables>
              <inOutVariables/>
              <outputVariables>
                <variable formalParameter="OUT">
                  <connectionPointOut>
                    <relPosition x="80" y="30"/>
                  </connectionPointOut>
                </variable>
              </outputVariables>
            </block>
            <inVariable localId="9" height="35" width="85">
              <position x="240" y="330"/>
              <connectionPointOut>
                <relPosition x="85" y="15"/>
              </connectionPointOut>
              <expression>COUNTER</expression>
            </inVariable>
            <block localId="10" width="80" height="65" typeName="ADD">
              <position x="380" y="330"/>
              <inputVariables>
                <variable formalParameter="IN1">
                  <connectionPointIn>
                    <relPosition x="0" y="30"/>
                    <connection refLocalId="9">
                      <position x="380" y="360"/>
                      <position x="352" y="360"/>
                      <position x="352" y="345"/>
                      <position x="325" y="345"/>
                    </connection>
                  </connectionPointIn>
                </variable>
                <variable formalParameter="IN2">
                  <connectionPointIn>
                    <relPosition x="0" y="55"/>
                    <connection refLocalId="11">
                      <position x="380" y="385"/>
                      <position x="325" y="385"/>
                    </connection>
                  </connectionPointIn>
                </variable>
              </inputVariables>
              <inOutVariables/>
              <outputVariables>
                <variable formalParameter="OUT">
                  <connectionPointOut>
                    <relPosition x="80" y="30"/>
                  </connectionPointOut>
                </variable>
              </outputVariables>
            </block>
            <inVariable localId="11" height="35" width="85" executionOrderId="0" negated="false">
              <position x="240" y="370"/>
              <connectionPointOut>
                <relPosition x="85" y="17"/>
              </connectionPointOut>
              <expression>1</expression>
            </inVariable>
            <block localId="13" width="80" height="65" typeName="EQ">
              <position x="535" y="255"/>
              <inputVariables>
                <variable formalParameter="IN1">
                  <connectionPointIn>
                    <relPosition x="0" y="30"/>
                    <connection refLocalId="2">
                      <position x="535" y="285"/>
                      <position x="460" y="285"/>
                    </connection>
                  </connectionPointIn>
                </variable>
                <variable formalParameter="IN2">
                  <connectionPointIn>
                    <relPosition x="0" y="55"/>
                    <connection refLocalId="10" formalParameter="OUT">
                      <position x="535" y="310"/>
                      <position x="497" y="310"/>
                      <position x="497" y="360"/>
                      <position x="460" y="360"/>
                    </connection>
                  </connectionPointIn>
                </variable>
              </inputVariables>
              <inOutVariables/>
              <outputVariables>
                <variable formalParameter="OUT">
                  <connectionPointOut>
                    <relPosition x="80" y="30"/>
                  </connectionPointOut>
                </variable>
              </outputVariables>
            </block>
            <block localId="15" width="80" height="135" typeName="SEL">
              <position x="785" y="245"/>
              <inputVariables>
                <variable formalParameter="G">
                  <connectionPointIn>
                    <relPosition x="0" y="40"/>
                    <connection refLocalId="13" formalParameter="OUT">
                      <position x="785" y="285"/>
                      <position x="615" y="285"/>
                    </connection>
                  </connectionPointIn>
                </variable>
                <variable formalParameter="IN0">
                  <connectionPointIn>
                    <relPosition x="0" y="75"/>
                    <connection refLocalId="10" formalParameter="OUT">
                      <position x="785" y="320"/>
                      <position x="650" y="320"/>
                      <position x="650" y="360"/>
                      <position x="460" y="360"/>
                    </connection>
                  </connectionPointIn>
                </variable>
                <variable formalParameter="IN1">
                  <connectionPointIn>
                    <relPosition x="0" y="115"/>
                    <connection refLocalId="16">
                      <position x="785" y="360"/>
                      <position x="760" y="360"/>
                    </connection>
                  </connectionPointIn>
                </variable>
              </inputVariables>
              <inOutVariables/>
              <outputVariables>
                <variable formalParameter="OUT">
                  <connectionPointOut>
                    <relPosition x="80" y="40"/>
                  </connectionPointOut>
                </variable>
              </outputVariables>
            </block>
            <inVariable localId="16" height="35" width="85" executionOrderId="0" negated="false">
              <position x="675" y="345"/>
              <connectionPointOut>
                <relPosition x="85" y="17"/>
              </connectionPointOut>
              <expression>0</expression>
            </inVariable>
            <outVariable localId="17" height="35" width="85">
              <position x="905" y="270"/>
              <connectionPointIn>
                <relPosition x="0" y="15"/>
                <connection refLocalId="15" formalParameter="OUT">
                  <position x="905" y="285"/>
                  <position x="865" y="285"/>
                </connection>
              </connectionPointIn>
              <expression>COUNTER</expression>
            </outVariable>
          </FBD>
        </body>
      </pou>
    </pous>
  </types>
  <instances>
    <configurations/>
  </instances>
</project>
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