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https://issues.apache.org/jira/browse/PLC4X-309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17393904#comment-17393904
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Maida Baralić commented on PLC4X-309:
-------------------------------------
I'm not sure if this might be caused by how this is handled in DataItemIO.
Because when I have an array of bytes like 0x01, 0x02, 0x03, there's a loop
iterating over them. However value of the individual values is written as a bit
value ->
value = val.getBoolean();
writeBuffer.writeBit("", value, new WithWriterArgs[0]);
And if I try to write a single byte value, it succeeds only if I specify an
array of boolean values.
plcWriteRequest.addItem("array", "%DB4:100.0:BYTE", true, false, false, false,
false, false, false, false); //SUCCESS
plcWriteRequest.addItem("array1", "%DB4:100.0:BYTE", 0x02); //FAILURE -> class
org.apache.plc4x.java.spi.values.PlcBYTE cannot be cast to class
org.apache.plc4x.java.spi.values.PlcList
Not sure if this additional info helps you in any way
> [S7] Writing byte array not working
> -----------------------------------
>
> Key: PLC4X-309
> URL: https://issues.apache.org/jira/browse/PLC4X-309
> Project: Apache PLC4X
> Issue Type: Bug
> Components: Driver-S7
> Affects Versions: 0.8.0
> Environment: Windows 10
> Reporter: Maida Baralić
> Priority: Major
> Attachments: DB4.pdf, PLCWrite.zip, write_byte_array_0.8.0.pcapng,
> write_byte_array_0.9.0.pcapng
>
>
> I'm having some issues with writing a byte array using S7 driver to the
> S7-1200.
> I'm a bit new to the communication with PLCs, so I'm not sure if I'm doing
> something wrong.
> I've followed the example of how to write a byte array to the connection,
> however I'm getting an INTERNAL_ERROR as a response code from the library and
> in the Wireshark the status from the PLC is inconsistent data type.
> I've attached both the sample project that's not working for me, my
> definition of byte array on the PLC and also Wireshark capture.
> It's possible that I'm not doing something right, however I can't figure it
> out.
> Writing of most of the single values is working, however the array is the
> problem. And as far as I understood from the code and documentation arrays
> should be supported.
> Any help would be appreciated.
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