public override bool Write(plcdb_lib.Models.Model.TagsRow t, object val)
{
try
{
if (!ActiveTags.Select(p => p.TagRow).Contains(t))
{
AddTagToGroup(t);
}
OpcTag ToWrite = ActiveTags.First(p => p.TagRow.PK == t.PK);
TagGroup.SyncWriteItems(new int[] { ToWrite.ServerId }, new object[] { val });
return(true);
}
catch (Exception ex)
{
throw new Exception("Error writing tag '" + t + "' from OPC server: " + ControllerInfo.Address + "\\" + ControllerInfo.opc_server, ex);
}
}
private void AddTagToGroup(Model.TagsRow tag)
{
try
{
if (TagGroup == null)
{
String OpcName = "plcdb-" + ControllerInfo.PK;
TagGroup = Server.AddGroup(Interlocked.Increment(ref GroupClientId), OpcName, true, 100, (float)0.0);
}
OpcTag NewTag = new OpcTag();
NewTag.TagRow = tag;
NewTag.Item = new Item()
{
//AccessPath = TagRow.Address,
Active = true,
ClientId = (int)tag.PK,
ItemId = tag.Address,
RequestedDataType = VarEnum.VT_EMPTY// TagRow.IsDataTypeNull() ? VarEnum.VT_UNKNOWN : TypeToOpcType(TagRow.DataType)
};
NewTag.ItemValue = new ItemValue();
var TagResult = TagGroup.AddItems(new Item[] { NewTag.Item }).First();
NewTag.ItemResult = TagResult;
ActiveTags.Add(NewTag);
//add event handler -- make sure we are not adding a duplicate copy
TagGroup.ReadComplete -= TagGroup_ReadComplete;
TagGroup.DataChange -= TagGroup_ReadComplete;
TagGroup.ReadComplete += TagGroup_ReadComplete;
TagGroup.DataChange += TagGroup_ReadComplete;
}
catch (Exception ex)
{
throw new Exception("Error adding tag '" + tag + "' to group on OPC server: " + ControllerInfo.Address + "\\" + ControllerInfo.opc_server, ex);
}
}