public static ReadDataServiceReply ReadLogixData(SessionInfo si, string tagAddress, ushort elementCount)
{
int requestSize = 0;
ReadDataServiceRequest request = BuildLogixReadDataRequest(tagAddress, elementCount, out requestSize);
EncapsRRData rrData = new EncapsRRData();
rrData.CPF = new CommonPacket();
rrData.CPF.AddressItem = CommonPacketItem.GetConnectedAddressItem(si.ConnectionParameters.O2T_CID);
rrData.CPF.DataItem = CommonPacketItem.GetConnectedDataItem(request.Pack(), SequenceNumberGenerator.SequenceNumber);
rrData.Timeout = 2000;
EncapsReply reply = si.SendUnitData(rrData.CPF.AddressItem, rrData.CPF.DataItem);
if (reply == null)
{
return(null);
}
if (reply.Status != 0 && reply.Status != 0x06)
{
//si.LastSessionError = (int)reply.Status;
return(null);
}
return(new ReadDataServiceReply(reply));
}
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);
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);
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);
}
}