Reading Raw Tags

[airwedge1]

I see an example of raw tags from the base C Library (https://github.com/libplctag/libplctag/blob/release/src/examples/test_raw_cip.c) , but I can't seem how to figure out how to do the same thing with the .net wrapper.

Anyone have an example using the .net wrapper?

[timyhac]

You can't do it with Tag<T> yet but you should be able to with the Tag class.

Please study this example here: https://github.com/libplctag/libplctag.NET/blob/%23211/src/Examples/CSharp%20DotNetCore/ExampleRaw.cs

Its in a branch for some unrelated feature but should still work with the current build.

What is your use case by the way?

[airwedge1]

I'm trying to read and write the wall clock time. https://github.com/libplctag/libplctag/issues/360. Thanks for the example. I'll check it out.

[kyle-github]

Ooh, forgot about that one. I need to triage the open tickets again. I should code up an example in C for this though I bet that C# will be a lot more fun.

[airwedge1]

The ExampleRaw.cs example did not work out of the box for me. It throws an ErrorBadParam exception. The initialization order does not seem to be correct.

I simplified the example and got a lot farther combining the C example with your example. I get data back but the decode returns an ErrorOutOfBounds exception. My assumption was the example payload here was the same as the @tags payload.

` var raw_payload = new byte[] { 0x55, 0x03, 0x20, 0x6b, 0x25, 0x00, 0x00, 0x00, 0x04, 0x00, 0x02, 0x00, 0x07, 0x00, 0x08, 0x00, 0x01, 0x00 };

        var x = new Tag()
        {
            Gateway = "0.0.0.0",
            Path = "1,0",
            PlcType = PlcType.ControlLogix,
            Protocol = Protocol.ab_eip,
            Timeout = TimeSpan.FromMilliseconds(1000),
            Name = "@raw"
        };

        x.Initialize();

        x.SetSize(raw_payload.Length);

        for (int ii = 0; ii < raw_payload.Length; ii++)
            x.SetUInt8(ii, raw_payload[ii]);

        x.Write();

        var tagInfoMapper = new TagInfoPlcMapper() { PlcType = PlcType.ControlLogix };
        var info = tagInfoMapper.Decode(x);

`

[timyhac]

Assuming you changed the gateway for posting here, I'm not sure what the problem is - are you successfuly able to use the @tags special tag, and other tags for that matter?

Is it possible to post some debug logs?

[airwedge1]

Correct If I do the below it works fine. Comparing between @tags and @raw it looks like the very first request is identical, but I think the @tags actually makes multiple requests, so I actually think the @raw example is working correctly. I attached the logs anyway.

So I just need to figure out what the raw payload needs to look like for reading / writing the wall clock time. I know there something called a class code = x8b, instance = x01, something called request data that is \x01\x00\x0B\x00 when reading, and is a LINT value when writing.

I will close this issue. I still have the other ticket about the wall clock time that Kyle mentioned so I'll leave that one open.

var x = new Tag()
{
    Gateway = "10.1.16.11",
    Path = "1,0",
    PlcType = PlcType.ControlLogix,
    Protocol = Protocol.ab_eip,
    Timeout = TimeSpan.FromMilliseconds(1000),
    Name = "@tags"
};

x.Read();

var tagInfoMapper = new TagInfoPlcMapper() { PlcType = PlcType.ControlLogix };
var info = tagInfoMapper.Decode(x);

logs.zip