Sebastian Voss created PLC4X-246:
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Summary: S7 driver hangs on read
Key: PLC4X-246
URL: https://issues.apache.org/jira/browse/PLC4X-246
Project: Apache PLC4X
Issue Type: Bug
Components: Driver-S7
Affects Versions: 0.7.0
Reporter: Sebastian Voss
Attachments: s7_capture.pcapng
I’m trying to read a value from an Siemens S7-1200 PLC). When I try to read a
value the read request is not being executed (I also do not receive an error
message or timeout).
This is the simple program I created:
{code:java}
String url = "s7://172.29.118.20:102?controller-type=S7_1200";
PlcDriverManager manager = new PlcDriverManager();
PlcConnection connection = manager.getConnection(url);
boolean isConnected = connection.isConnected();
boolean canRead = connection.getMetadata().canRead();
System.out.println(isConnected); // prints true
System.out.println(canRead); // prints true
String field = "%DB20:5.0:BOOL";
PlcReadRequest request = connection
.readRequestBuilder()
.addItem("value-1", field)
.build();
PlcReadResponse response = request.execute().get(); // here is hangs forever
System.out.println(response.getFieldNames());
connection.close();{code}
I created a Wireshark capture and it seems the PLC is reporting:
{code:java}
[Error code: This service is not implemented on the module or a frame error was
reported (0x8104)]{code}
Thanks to the help of [~cdutz] I figured out this is related to the protection
settings of the PLC. I will try to adjust those settings and report back the
result. Maybe the driver can be improved to report back those error codes to
the user.
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