Associated with: Advance OPC database items
The Source attribute is common to many Status displays. The attribute indicates the location at which the item resides. The information shown varies, depending on the item.
The Source attribute displays the value Undefined if the item’s configuration is incomplete, in so far as the device with which the item is associated has not yet been specified.
For an Advanced OPC server, the information displayed is the Server ProgID. If the server is a Remote Server, then it displays:
<Remote Node>:<ProgID>
(see Configure OPC DA Server Properties)
Example:
Schneider.Geo SCADA Expert.MAIN.SERVER01
For an Advanced OPC Group, the information displayed where only one server exists is the same as for the server shown above. In a redundant system where the group is associated with more than one server the information displayed is:
Multiple Servers (#), where # is the number of servers with which the group is associated.
For an Advanced OPC point, information is displayed in a format similar to that illustrated below:
<Server ProgID>:<Item Type 'Item Id'>
The information displayed is the same for a group source, it can indicate a remote node or 'Multiple Servers'.
For digital points, there is a suffix with the number of bits;
<Server ProgID>:<Digital Item 'Item Id', Bits #>
Example:
Schneider.Geo SCADA Expert.MAIN.SERVER01:Analog Item 'Advanced OPC.Internal.New Analog Point.CurrentValue'
The example illustrates an Analog Point where the Item Id is ‘Advanced OPC.Internal.New Analog Point.CurrentValue’).