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Posted to issues@plc4x.apache.org by "JoonasC (via GitHub)" <gi...@apache.org> on 2024/09/23 13:29:55 UTC
[I] [Bug]: PLC4X does not wait for response when reading data from Beckhoff Twincat 3 PLC with Ethernet/IP
JoonasC opened a new issue, #1780:
URL: https://github.com/apache/plc4x/issues/1780
### What happened?
It seems like PLC4X does not wait for a response from the Ethernet/IP server when reading data (specifically using the Ethernet/IP scanner device in Beckhoff Twincat3 PLCs)
I'm using the following code to test reading:
```java
public class Main {
public static void main(String[] args) {
String connectionString = "eip://10.50.100.216:44818?bigEndian=false";
try (PlcConnection plcConnection = PlcDriverManager.getDefault().getConnectionManager().getConnection(connectionString)) {
PlcReadRequest.Builder readBuilder = plcConnection.readRequestBuilder();
readBuilder.addTagAddress("Var1", "%Var1");
PlcReadRequest readRequest = readBuilder.build();
System.out.println("--- Reading data ---");
PlcReadResponse readResponse = readRequest.execute().get();
System.out.println("--- Read complete ---");
System.out.println(readResponse.getResponseCode("Var1"));
System.out.println(readResponse.getObject("Var1"));
} catch (Exception e) {
System.out.println("Connection failed");
e.printStackTrace();
}
}
}
```
Stacktrace:
> org.apache.plc4x.java.api.exceptions.PlcInvalidTagException: Var1 invalid
> at org.apache.plc4x.java.spi.messages.DefaultPlcReadResponse.getResponseCode(DefaultPlcReadResponse.java:100)
> at org.example.Main.main(Main.java:20)
Looking at Wireshark, PLC4X closes the connection before the PLC has a chance to respond to the read request:
[Capture.pcapng.gz](https://github.com/user-attachments/files/17098250/Capture.pcapng.gz)
I can workaround this bug by adding a manual `Thread.sleep` before trying to interact with the read response object:
```java
System.out.println("--- Reading data ---");
PlcReadResponse readResponse = readRequest.execute().get();
Thread.sleep(1000);
System.out.println("--- Read complete ---");
```
Here is my Twincat3 Ethernet/IP explicit messaging configuration:
### Version
0.12.0
### Programming Languages
- [X] plc4j
- [ ] plc4go
- [ ] plc4c
- [ ] plc4net
### Protocols
- [ ] AB-Ethernet
- [ ] ADS /AMS
- [ ] BACnet/IP
- [ ] CANopen
- [ ] DeltaV
- [ ] DF1
- [X] EtherNet/IP
- [ ] Firmata
- [ ] KNXnet/IP
- [ ] Modbus
- [ ] OPC-UA
- [ ] S7
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Re: [I] [Bug]: PLC4X does not wait for response when reading data from Beckhoff Twincat 3 PLC with Ethernet/IP
Posted by "chrisdutz (via GitHub)" <gi...@apache.org>.
chrisdutz commented on issue #1780:
URL: https://github.com/apache/plc4x/issues/1780#issuecomment-5291245346
As I recently completely rewrote most of the Java drivers, I asked claude to verify open issues agains the updated code and assess if the issue still persists:
Close asking for a retest — fix is in, but the reporter's exact setup can't be reproduced here:
- #1780 (EIP doesn't wait for response) — the correlation race is gone architecturally (pendingRequests + explicit orTimeout), but whether a Beckhoff EIP
scanner answers PLC4X's ANSI-symbol read is a separate, hardware-only question.
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Re: [I] [Bug]: PLC4X does not wait for response when reading data from Beckhoff Twincat 3 PLC with Ethernet/IP
Posted by "JoonasC (via GitHub)" <gi...@apache.org>.
JoonasC commented on issue #1780:
URL: https://github.com/apache/plc4x/issues/1780#issuecomment-2368294186
I'm investigating the Ethernet/IP functionality of PLC4X, but do not have any other Ethernet/IP capable devices on hand.
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Re: [I] [Bug]: PLC4X does not wait for response when reading data from Beckhoff Twincat 3 PLC with Ethernet/IP
Posted by "chrisdutz (via GitHub)" <gi...@apache.org>.
chrisdutz commented on issue #1780:
URL: https://github.com/apache/plc4x/issues/1780#issuecomment-2368306251
Hehe ... ok ... I guess that's really the only case it would make sense ;-)
As I also have a Beckhoff ADS device here ... if you could describe and document how to setup the EIP stuff, I could give it a try on my device.
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Re: [I] [Bug]: PLC4X does not wait for response when reading data from Beckhoff Twincat 3 PLC with Ethernet/IP
Posted by "chrisdutz (via GitHub)" <gi...@apache.org>.
chrisdutz closed issue #1780: [Bug]: PLC4X does not wait for response when reading data from Beckhoff Twincat 3 PLC with Ethernet/IP
URL: https://github.com/apache/plc4x/issues/1780
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Re: [I] [Bug]: PLC4X does not wait for response when reading data from Beckhoff Twincat 3 PLC with Ethernet/IP
Posted by "JoonasC (via GitHub)" <gi...@apache.org>.
JoonasC commented on issue #1780:
URL: https://github.com/apache/plc4x/issues/1780#issuecomment-2368360277
Sure, here is Beckhoff's official documentation: [https://infosys.beckhoff.com/english.php?content=../content/1033/tf6281_tc3_ethernetipscanner/index.html&id=](https://infosys.beckhoff.com/english.php?content=../content/1033/tf6281_tc3_ethernetipscanner/index.html&id=)
For a TLDR version:
1. Add an Ethernet/IP scanner device:
2. Create a sync task for the device:
3. Create a global variable list called `ETHIP`, which contains variables declared in the `M` memory area:
4. Add the `Tc2_EthernetIP` library to the PLC project:
5. Check the read and write options for tags you want to read/write to:
6. Get the IP address of the Ethernet/IP server from the settings tab:
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Re: [I] [Bug]: PLC4X does not wait for response when reading data from Beckhoff Twincat 3 PLC with Ethernet/IP
Posted by "chrisdutz (via GitHub)" <gi...@apache.org>.
chrisdutz commented on issue #1780:
URL: https://github.com/apache/plc4x/issues/1780#issuecomment-2368279430
Just a quick question ... why would you access a Beckhoff ADS device with EIP and not ADS? It's sort of like having a Porsche in the garage but driving with the Dacia ;-)
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