private void AddOrCreateReadPacket(LogixTag tag, int idx) { //First we create the request... int temp = 0; ReadDataServiceRequest request = LogixServices.BuildLogixReadDataRequest( tag.Address, tag.Elements, out temp); //Now we read it from the PLC to find out if it's fragmented... CommonPacketItem addressItem = CommonPacketItem.GetConnectedAddressItem(_parent.SessionInfo.ConnectionParameters.O2T_CID); CommonPacketItem dataItem = CommonPacketItem.GetConnectedDataItem(request.Pack(), SequenceNumberGenerator.SequenceNumber(_parent.SyncRoot)); //ToDo _parent.SyncRoot EncapsReply reply = _parent.SessionInfo.SendUnitData(addressItem, dataItem); if (reply != null) { //It's a good tag, let's figure out if it's fragmented... ReadDataServiceReply rdReply = new ReadDataServiceReply(reply); PacketMap pm = new PacketMap() { TagIndex = idx }; pm.PacketIndex = new List <int>(); pm.ServiceIndex = new List <int>(); pm.Offsets = new List <uint>(); pm.NumReplies = 1; if (rdReply.Status == 0x06) { //Partial read... We'll have to request more data, but first let's make this packet request = LogixServices.BuildFragmentedReadDataRequest(tag.Address, tag.Elements, 0, out temp); int[] status = FindPacketOrCreate(request.Pack(), (ushort)(rdReply.Data.Length + 2)); uint offset = (uint)rdReply.Data.Length; pm.PacketIndex.Add(status[0]); pm.ServiceIndex.Add(status[1]); pm.Offsets.Add(0); while (rdReply.Status == 0x06) { rdReply = LogixServices.ReadLogixDataFragmented(_parent.SessionInfo, tag.Address, tag.Elements, offset, _parent.SyncRoot); //ToDo _parent.SyncRoot request = LogixServices.BuildFragmentedReadDataRequest(tag.Address, tag.Elements, offset, out temp); status = FindPacketOrCreate(request.Pack(), (ushort)(rdReply.Data.Length + 2)); pm.PacketIndex.Add(status[0]); pm.ServiceIndex.Add(status[1]); offset += (uint)rdReply.Data.Length; pm.Offsets.Add(offset); pm.NumReplies++; } } else if (rdReply.Status == 0x00 && rdReply.Data != null) { //Full read, create the packet... int[] status = FindPacketOrCreate(request.Pack(), (ushort)(rdReply.Data.Length + 2)); pm.PacketIndex.Add(status[0]); pm.ServiceIndex.Add(status[1]); pm.Offsets.Add(0); } _readPackets.Add(pm); } }