fix bug with TextViewer instance in debug mode, appears after transferring new program on PLC
TextViewer isn't able to display debug values, so calling for this class SubscribeAllDataConsumers method causes error
<?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="2015-02-05T11:44:55" contentDescription=" "/>
<contentHeader name="WAMPTest" modificationDateTime="2015-02-18T23:59:50">
<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="LocalVar0">
<type>
<DINT/>
</type>
</variable>
</localVars>
<externalVars>
<variable name="PyVar0">
<type>
<DINT/>
</type>
</variable>
<variable name="PyVar1">
<type>
<DINT/>
</type>
</variable>
</externalVars>
</interface>
<body>
<FBD>
<inVariable localId="1" executionOrderId="0" height="25" width="55" negated="false">
<position x="144" y="70"/>
<connectionPointOut>
<relPosition x="55" y="12"/>
</connectionPointOut>
<expression>PyVar0</expression>
</inVariable>
<block localId="3" typeName="ADD" executionOrderId="0" height="60" width="65">
<position x="245" y="52"/>
<inputVariables>
<variable formalParameter="IN1">
<connectionPointIn>
<relPosition x="0" y="30"/>
<connection refLocalId="1">
<position x="245" y="82"/>
<position x="199" y="82"/>
</connection>
</connectionPointIn>
</variable>
<variable formalParameter="IN2">
<connectionPointIn>
<relPosition x="0" y="50"/>
<connection refLocalId="4">
<position x="245" y="102"/>
<position x="228" y="102"/>
<position x="228" y="113"/>
<position x="198" y="113"/>
</connection>
</connectionPointIn>
</variable>
</inputVariables>
<inOutVariables/>
<outputVariables>
<variable formalParameter="OUT">
<connectionPointOut>
<relPosition x="65" y="30"/>
</connectionPointOut>
</variable>
</outputVariables>
</block>
<inVariable localId="4" executionOrderId="0" height="25" width="73" negated="false">
<position x="125" y="101"/>
<connectionPointOut>
<relPosition x="73" y="12"/>
</connectionPointOut>
<expression>LocalVar0</expression>
</inVariable>
<outVariable localId="2" executionOrderId="0" height="25" width="55" negated="false">
<position x="344" y="70"/>
<connectionPointIn>
<relPosition x="0" y="12"/>
<connection refLocalId="3" formalParameter="OUT">
<position x="344" y="82"/>
<position x="310" y="82"/>
</connection>
</connectionPointIn>
<expression>PyVar1</expression>
</outVariable>
</FBD>
</body>
</pou>
</pous>
</types>
<instances>
<configurations>
<configuration name="config">
<resource name="resource1">
<task name="Task0" priority="0" interval="T#100ms">
<pouInstance name="Instance0" typeName="program0"/>
</task>
</resource>
</configuration>
</configurations>
</instances>
</project>