Hi Jonas,
I think I can possibly help you now … as I worked on the new Beckhoff driver I
finally got to working with the ADS protocol.
I think the problem you are having is that the address you are using is simply
not correct.
The PLC doesn’t find an address called “BOOL1” … After discussing things with
the Beckhoff Tech-Staff I learned, that you should address resources with
symbolic addresses like:
main.f_trigDateiGelesen.M:BOOL
Please note that there seems to be differences between TwinCat2 and TwinCat3
devices regarding this symbolic address format. The older ones seem to simply
start without the module name. Like: “.f_trigDateiGelesen.M:BOOL” (But I
haven’t been able to verify this)
The other option would be to use fixed addresses, like:
0x0000f005/0x1a800000:BOOL
Which is however considered bad practice, as adding one single byte to the PLC
could ruin all of your addesses.
Hope this helps a little more.
Chris
Von: "Hillenbrand, Jonas (wbk)" <jonas.hillenbr...@kit.edu>
Antworten an: <dev@plc4x.apache.org>
Datum: Mittwoch, 29. Juli 2020 um 11:25
An: "dev@plc4x.apache.org" <dev@plc4x.apache.org>
Betreff: How to compose Read requests for ADS Protocol with PLC4X?
Hi there,
I’m working on using the PLC4X framework within my research projects involving
datalogging from Beckhoff PLC via ADS protocol.
I was able to connect with the PLC using the following code, but it fails on
the line where the read request is executed:
PlcConnection plcConnection = null;
String connectionStr = "
ads:tcp://127.0.0.1:48898/5.23.164.94.1.1:851/129.254.235.187.1.1:32835”;
try {
plcConnection = new
PlcDriverManager().getConnection(connectionStr);
if (this.plcConnection.isConnected()){
if (!this.isAdsReadable() ||
!this.isAdsWritable() || !this.isAdsSubscribable()) {
return false;
}
this.logger.log("Connected successfully with
" + connectionStr);
return true;
} else {
this.logger.log(Level.ERROR, "Could not
connect with " + connectionStr);
return false;
}
} catch (PlcConnectionException e) {
// TODO Auto-generated catch block
this.logger.log(e);
return false;
}
PlcReadRequest.Builder builder =plcConnection.readRequestBuilder();
builder.addItem(“BOOL1”, "BOOL1:BOOL"); //
Boolean variable in GVL (global) list of SPS Project
PlcReadRequest readRequest = builder.build();
PlcReadResponse response = null;
try {
response = readRequest.execute().get();
// CODE FAILS HERE
} catch (InterruptedException e) {
// TODO Auto-generated catch block
this.logger.log(e);
} catch (ExecutionException e) {
// TODO Auto-generated catch block
this.logger.log(e);
}
Console Output:
Connected successfully with
ads:tcp://127.0.0.1:48898/5.23.164.94.1.1:851/129.254.235.187.1.1:32835
Exception in thread "main"
org.apache.plc4x.java.api.exceptions.PlcRuntimeException: Non error code
received Result{AdsReturnCode{hex=0x0710, dec=1808, description='symbol not
found', possibleCauses='', solution=''}}
at
org.apache.plc4x.java.ads.connection.AdsAbstractPlcConnection.lambda$mapFields$3(AdsAbstractPlcConnection.java:184)
at
java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1708)
at
org.apache.plc4x.java.ads.connection.AdsAbstractPlcConnection.mapFields(AdsAbstractPlcConnection.java:163)
at
java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
at
java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
at
java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177)
at
java.base/java.util.LinkedList$LLSpliterator.forEachRemaining(LinkedList.java:1242)
at
java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
at
java.base/java.util.stream.ForEachOps$ForEachTask.compute(ForEachOps.java:290)
at
java.base/java.util.concurrent.CountedCompleter.exec(CountedCompleter.java:746)
at
java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
at
java.base/java.util.concurrent.ForkJoinTask.doInvoke(ForkJoinTask.java:408)
at
java.base/java.util.concurrent.ForkJoinTask.invoke(ForkJoinTask.java:736)
at
java.base/java.util.stream.ForEachOps$ForEachOp.evaluateParallel(ForEachOps.java:159)
at
java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateParallel(ForEachOps.java:173)
at
java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:233)
at
java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
at
org.apache.plc4x.java.ads.connection.AdsAbstractPlcConnection.mapFields(AdsAbstractPlcConnection.java:157)
at
org.apache.plc4x.java.ads.connection.AdsAbstractPlcConnection.read(AdsAbstractPlcConnection.java:103)
at
org.apache.plc4x.java.base.messages.DefaultPlcReadRequest.execute(DefaultPlcReadRequest.java:44)
at
net.sytes.botg.ads.MyADSClient.executeReadRequest(MyADSClient.java:108)
at
net.sytes.botg.ads.UnitTest_MyADSClient.test2(UnitTest_MyADSClient.java:60)
at
net.sytes.botg.ads.UnitTest_MyADSClient.main(UnitTest_MyADSClient.java:44)
Could anybody offer some help? Am I constructing the item for the read request
correctly, what if I’m trying to read variables in a subroutine let’s say in
the Project “1Achser” my PLC Project name is “SPSObject” and I have a PRG block
named “MainGUI”, in there I have the variable “CurPos [LREAL]”, how would I
conceive the addItem Method? --> builder.addItem(“CurPos”,
"1Achser.SPSObject.MainGUI.CurPos:LReal")?
Anyhelp would be appreciated.
And by the way, I like the idea of PLC4X very much and love to contribute,
given that I can make it work for my setup :D
Best Regards
Jonas
