Hi Chris, Hi Stefano,
Thanks a lot for your valuable feedback. It is highly appreciated.
I followed Stefanos suggestions and applied the simplifications. In addition I
created a Wireshark capture which is attached to this email.
It seems it replies with “[Error code: This service is not implemented on the
module or a frame error was reported (0x8104)]"
Does this mean the address is wrong or is it something else?
Best regards,
Sebastian
> On 31. Aug 2020, at 09:42, Stefano Bossi <stefano.bo...@gmail.com> wrote:
>
> Hi Sebastian,
>
> if you need some help in setup the wireshark capture software or open the
> jira ticket I could help.
>
> It’s definitely worth to follow the Chris suggestion to help him to spot the
> real problem.
>
> In the mean time I think you could simplify the PLC query in this way:
>
> String Url: s7:tcp://172.3.4.5:102?controller-type=S7_1200
>
> String field: %DB20:5.0:BOOL
>
> As far as the address of the Data Block and the bool value are correct,
> should work.
> There were nothing particular wrong in your query but the library is somewhat
> “sensible” if something goes wrong in the dialogue with the PLC
>
> An another thing you should pay attention is that the Data Block MUST be NOT
> optimized; reading of optimized block is not currently supported. This
> shouldn’t be your case because an attempt to read an optimized block raise an
> exception or a null value.
>
> Try and let us know.
>
> Regards,
> Stefano
>
> On 31/08/2020 08:48, Christofer Dutz wrote:
>
>
>
>> Hi Sebastian,
>>
>> could you possibly do a wireshark recording of this, create an issue in our
>> jira and attach the capture there?
>> I am sure we haven't handled all things that could go wrong and with this
>> information I might be able to improve the error handling.
>>
>> Chris
>>
>>
>>
>>
>> Am 30.08.20, 18:28 schrieb "Sebastian Voss"
>> <svdevl...@gmail.com>
>> :
>>
>> Hi,
>>
>> I’m trying to read a value from an Siemens S7-1200 PLC). This is my
>> first project using the S7 protocol and plc4x. When I try to read a value
>> the read request is not being executed (I also do not receive an error
>> message or timeout). Would this be the normal behaviour when the field
>> address is wrong? I’m out of ideas how to trace this down. Any hints would
>> be highly appreciated.
>>
>> This is the simple program I created:
>>
>> String url =
>> "s7://172.3.4.5:102?local-rack=0&local-slot=1&remote-rack=0&remote-slot=1&controller-type=S7_1200
>>
>> <s7://172.3.4.5:102?local-rack=0&local-slot=1&remote-rack=0&remote-slot=1&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:DBX05.0: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();
>>
>> Thanks a lot in advance!
>>
>> Best regards,
>> Sebastian
>>
>>
>
>
