TcSecretService_ReadDeviceDescription.cs

using System;
using System.Linq;
using System.Text;
using System.Xml.Linq;
using TwinCAT.Ads; // v4.4.0.0

namespace AdsReadSystemConfig
{
    class Program
    {
        const string TARGET_AMS = "127.0.0.1.1.1";
        const uint READDEVDESCRIPTION_IDX = 0x0000_02bc;
        const uint READDEVDESCRIPTION_OFF = 0x0000_0001;

        static void Main()
        {
            var client = new TcAdsClient();
            var ams = new AmsAddress(TARGET_AMS, AmsPort.R3_CTRLPROG);
            client.Connect(ams);

            // length of the plc's xml description
            int length = (int)client.ReadAny(READDEVDESCRIPTION_IDX, READDEVDESCRIPTION_OFF, typeof(int));
            var adsStream = new AdsStream(length);
            client.Read(READDEVDESCRIPTION_IDX, READDEVDESCRIPTION_OFF, adsStream);
            string description = Encoding.UTF8.GetString(adsStream.ToArray()).TrimEnd('\0');

            var xdoc = XDocument.Parse(description);
            var elements = xdoc.Descendants();
            Console.WriteLine(xdoc);
            Console.WriteLine();

            // looking for the name of PLC's OS
            var osName = elements.FirstOrDefault(x => x.Name == "OsName")?.Value ?? "<Unknown>";

            Console.WriteLine("Press [Enter] to close...");
            Console.ReadLine();
        }
    }
}