DataItemWord.cs

var dataItems = new List<DataItem>();
for (int i = 0; i < 1; i += 2)
{
    dataItems.Add(DataItem.FromAddress("DB800.DBW" + i));
}

var ip = "10.10.11.38";
var plc = new S7.Net.Plc(CpuType.S7300, ip, 0, 2);

Console.WriteLine("Connecting " + ip);
plc.Open();
Console.WriteLine("IsConnected=" + plc.IsConnected);

Console.WriteLine("Reading items");
plc.ReadMultipleVars(dataItems);
foreach (var item in dataItems)
{
    Console.WriteLine("DB" + item.DB + ".DBW" + item.StartByteAdr + ": " + item.Value.ToString());
}

Console.WriteLine("Writing items");
dataItems[0].Value = 88;
plc.Write(dataItems[0]);


Console.WriteLine("Reading items");
plc.ReadMultipleVars(dataItems);
foreach (var item in dataItems)
{
    Console.WriteLine("DB" + item.DB + ".DBW" + item.StartByteAdr + ": " + item.Value.ToString());
}

plc.Close();