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tests/modbus/plc.xml
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Fri, 10 Aug 2018 17:45:33 +0300
changeset 2278 a3ac46366b86
parent 2252 de3f7c183e62
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:ns1="http://www.plcopen.org/xml/tc6_0201" xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://www.plcopen.org/xml/tc6_0201">
  <fileHeader companyName="Beremiz" productName="Beremiz" productVersion="1" creationDateTime="2018-07-27T13:19:12"/>
  <contentHeader name="Modbus" modificationDateTime="2018-07-27T15:43:56">
    <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="program0" pouType="program">
        <interface>
          <localVars>
            <variable name="Counter">
              <type>
                <INT/>
              </type>
            </variable>
            <variable name="CounterReadBack">
              <type>
                <INT/>
              </type>
            </variable>
          </localVars>
          <localVars>
            <variable name="MasterWriteToReg0" address="%QW0.0.0.0">
              <type>
                <INT/>
              </type>
            </variable>
            <variable name="MasterReadFromReg1" address="%IW0.0.1.0">
              <type>
                <INT/>
              </type>
            </variable>
            <variable name="SlaveHoldReg0" address="%IW0.1.0.0">
              <type>
                <WORD/>
              </type>
            </variable>
            <variable name="SlaveInputReg0" address="%QW0.1.1.0">
              <type>
                <WORD/>
              </type>
            </variable>
          </localVars>
          <localVars>
            <variable name="CTU0">
              <type>
                <derived name="CTU"/>
              </type>
            </variable>
            <variable name="Generator0">
              <type>
                <derived name="Generator"/>
              </type>
            </variable>
          </localVars>
        </interface>
        <body>
          <FBD>
            <comment localId="4" height="109" width="350">
              <position x="102" y="438"/>
              <content>
                <xhtml:p><![CDATA[Modbus TCP Master writes counter value to one holding register on Modbus TCP Slave and reads it back from other input register.]]></xhtml:p>
              </content>
            </comment>
            <comment localId="3" height="407" width="680">
              <position x="21" y="15"/>
              <content>
                <xhtml:p><![CDATA[This examples shows how to work with Modbus extension. It uses Modbus TCP, but the same functions are available for Modbus RTU as well. Buth protocols are supported.

Modbus extensions requires native Modbus RTU/TCP library to be installed nearby Beremiz.
Following directory structure is expected:
<Parent directory>
  "beremiz"
  "Modbus"

If Modbus library is installed elsewhere, then place corresponding paths
in CFLAGS/LDFLAGS in project settings.

For GNU/Linux to install Modbus library in parent directory run following commands:
$ hg clone https://bitbucket.org/mjsousa/modbus Modbus
$ cd Modbus
$ make

After that Modbus extension is ready to be used in Beremiz projects.]]></xhtml:p>
              </content>
            </comment>
            <block localId="5" typeName="CTU" instanceName="CTU0" executionOrderId="0" height="80" width="52">
              <position x="346" y="605"/>
              <inputVariables>
                <variable formalParameter="CU" edge="rising">
                  <connectionPointIn>
                    <relPosition x="0" y="30"/>
                    <connection refLocalId="6" formalParameter="OUT">
                      <position x="346" y="635"/>
                      <position x="303" y="635"/>
                    </connection>
                  </connectionPointIn>
                </variable>
                <variable formalParameter="R">
                  <connectionPointIn>
                    <relPosition x="0" y="50"/>
                  </connectionPointIn>
                </variable>
                <variable formalParameter="PV">
                  <connectionPointIn>
                    <relPosition x="0" y="70"/>
                    <connection refLocalId="7">
                      <position x="346" y="675"/>
                      <position x="324" y="675"/>
                      <position x="324" y="703"/>
                      <position x="302" y="703"/>
                    </connection>
                  </connectionPointIn>
                </variable>
              </inputVariables>
              <inOutVariables/>
              <outputVariables>
                <variable formalParameter="Q">
                  <connectionPointOut>
                    <relPosition x="52" y="30"/>
                  </connectionPointOut>
                </variable>
                <variable formalParameter="CV">
                  <connectionPointOut>
                    <relPosition x="52" y="50"/>
                  </connectionPointOut>
                </variable>
              </outputVariables>
            </block>
            <block localId="6" typeName="Generator" instanceName="Generator0" executionOrderId="0" height="60" width="79">
              <position x="224" y="605"/>
              <inputVariables>
                <variable formalParameter="PON">
                  <connectionPointIn>
                    <relPosition x="0" y="30"/>
                    <connection refLocalId="1">
                      <position x="224" y="635"/>
                      <position x="154" y="635"/>
                    </connection>
                  </connectionPointIn>
                </variable>
                <variable formalParameter="POFF">
                  <connectionPointIn>
                    <relPosition x="0" y="50"/>
                    <connection refLocalId="1">
                      <position x="224" y="655"/>
                      <position x="189" y="655"/>
                      <position x="189" y="635"/>
                      <position x="154" y="635"/>
                    </connection>
                  </connectionPointIn>
                </variable>
              </inputVariables>
              <inOutVariables/>
              <outputVariables>
                <variable formalParameter="OUT">
                  <connectionPointOut>
                    <relPosition x="79" y="30"/>
                  </connectionPointOut>
                </variable>
              </outputVariables>
            </block>
            <inVariable localId="1" executionOrderId="0" height="30" width="138" negated="false">
              <position x="16" y="620"/>
              <connectionPointOut>
                <relPosition x="138" y="15"/>
              </connectionPointOut>
              <expression>T#1s</expression>
            </inVariable>
            <inVariable localId="7" executionOrderId="0" height="30" width="138" negated="false">
              <position x="164" y="688"/>
              <connectionPointOut>
                <relPosition x="138" y="15"/>
              </connectionPointOut>
              <expression>32767</expression>
            </inVariable>
            <inOutVariable localId="2" executionOrderId="0" height="30" width="138" negatedOut="false" negatedIn="false">
              <position x="544" y="640"/>
              <connectionPointIn>
                <relPosition x="0" y="15"/>
                <connection refLocalId="5" formalParameter="CV">
                  <position x="544" y="655"/>
                  <position x="398" y="655"/>
                </connection>
              </connectionPointIn>
              <connectionPointOut>
                <relPosition x="138" y="15"/>
              </connectionPointOut>
              <expression>Counter</expression>
            </inOutVariable>
            <outVariable localId="8" executionOrderId="0" height="30" width="138" negated="false">
              <position x="762" y="640"/>
              <connectionPointIn>
                <relPosition x="0" y="15"/>
                <connection refLocalId="2">
                  <position x="762" y="655"/>
                  <position x="682" y="655"/>
                </connection>
              </connectionPointIn>
              <expression>MasterWriteToReg0</expression>
            </outVariable>
            <inVariable localId="9" executionOrderId="0" height="30" width="152" negated="false">
              <position x="81" y="747"/>
              <connectionPointOut>
                <relPosition x="152" y="15"/>
              </connectionPointOut>
              <expression>MasterReadFromReg1</expression>
            </inVariable>
            <outVariable localId="10" executionOrderId="0" height="30" width="137" negated="false">
              <position x="547" y="747"/>
              <connectionPointIn>
                <relPosition x="0" y="15"/>
                <connection refLocalId="9">
                  <position x="547" y="762"/>
                  <position x="233" y="762"/>
                </connection>
              </connectionPointIn>
              <expression>CounterReadBack</expression>
            </outVariable>
            <comment localId="11" height="109" width="350">
              <position x="85" y="825"/>
              <content>
                <xhtml:p><![CDATA[Modbus TCP Slave just copies received register value from holding register to input register.]]></xhtml:p>
              </content>
            </comment>
            <inVariable localId="12" executionOrderId="0" height="30" width="152" negated="false">
              <position x="82" y="970"/>
              <connectionPointOut>
                <relPosition x="152" y="15"/>
              </connectionPointOut>
              <expression>SlaveHoldReg0</expression>
            </inVariable>
            <outVariable localId="13" executionOrderId="0" height="30" width="123" negated="false">
              <position x="548" y="970"/>
              <connectionPointIn>
                <relPosition x="0" y="15"/>
                <connection refLocalId="12">
                  <position x="548" y="985"/>
                  <position x="234" y="985"/>
                </connection>
              </connectionPointIn>
              <expression>SlaveInputReg0</expression>
            </outVariable>
          </FBD>
        </body>
      </pou>
      <pou name="Generator" pouType="functionBlock">
        <interface>
          <outputVars>
            <variable name="OUT">
              <type>
                <BOOL/>
              </type>
            </variable>
          </outputVars>
          <inputVars>
            <variable name="PON">
              <type>
                <TIME/>
              </type>
            </variable>
            <variable name="POFF">
              <type>
                <TIME/>
              </type>
            </variable>
          </inputVars>
          <localVars>
            <variable name="T1">
              <type>
                <derived name="TON"/>
              </type>
            </variable>
            <variable name="T2">
              <type>
                <derived name="TOF"/>
              </type>
            </variable>
          </localVars>
        </interface>
        <body>
          <ST>
            <xhtml:p><![CDATA[T1( IN := NOT T2.Q, PT := POFF);
T2( IN := T1.Q,     PT := PON);
OUT := T2.Q;]]></xhtml:p>
          </ST>
        </body>
      </pou>
    </pous>
  </types>
  <instances>
    <configurations>
      <configuration name="config">
        <resource name="resource1">
          <task name="task0" priority="0" interval="T#20ms">
            <pouInstance name="instance0" typeName="program0"/>
          </task>
        </resource>
      </configuration>
    </configurations>
  </instances>
</project>
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