/// <summary>
/// Reads a single tag
/// </summary>
/// <param name="tag">Tag to read</param>
/// <returns>True if the read was successful</returns>
/// <remarks>This is not the preferred method of updating tag information. If you have
/// multiple tags that you want to update, use the <see cref="UpdateGroup"/> method.</remarks>
public bool ReadTag(ITag tag)
{
lock (_lockObject)
{
LogixTag lgxTag = tag as LogixTag;
if (lgxTag == null)
{
throw new ArgumentException(Resources.ErrorStrings.IncorrectArgTagType, "tag");
}
ReadDataServiceReply lgxRead = LogixServices.ReadLogixData(_session, lgxTag.Address, (ushort)lgxTag.Elements);
if (lgxRead == null || lgxRead.Data == null)
{
if (lgxRead != null)
{
lgxTag.SetTagError(lgxRead.ByteStatus);
}
lgxTag.LastError = Resources.ErrorStrings.TagNotFound + _ipAddress;
lgxTag.LastErrorNumber = (int)LogixErrors.TagNotFound;
return(false);
}
lgxTag.SetTagError(lgxRead.ByteStatus);
CIPType tagType = (CIPType)lgxRead.DataType;
byte[] temp = new byte[lgxRead.Data.Length + 2];
Buffer.BlockCopy(BitConverter.GetBytes(lgxRead.DataType), 0, temp, 0, 2);
Buffer.BlockCopy(lgxRead.Data, 0, temp, 2, lgxRead.Data.Length);
lgxTag.UpdateValue(temp);
uint offset = (uint)lgxRead.Data.Length;
if (lgxRead.Status == 0x06)
{
//We are going to have to request more data...
while (lgxRead.Status == 0x06)
{
lgxRead = LogixServices.ReadLogixDataFragmented(_session, lgxTag.Address, (ushort)lgxTag.Elements, offset);
lgxTag.SetTagError(lgxRead.ByteStatus);
tagType = (CIPType)lgxRead.DataType;
temp = new byte[lgxRead.Data.Length + 2];
Buffer.BlockCopy(BitConverter.GetBytes(lgxRead.DataType), 0, temp, 0, 2);
Buffer.BlockCopy(lgxRead.Data, 0, temp, 2, lgxRead.Data.Length);
lgxTag.UpdateValue(temp, offset);
offset += (uint)lgxRead.Data.Length;
}
}
} //End Lock
return(true);
}
public UserAttribut(string name, CIPType type)
{
this.name = name;
this.type = type;
}
