Source
Associated with: OPC UA Subscription items and OPC UA Points
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 OPC UA Subscription items that are in a single OPC UA server configuration, information is displayed in this format:
<Server URL>
For OPC UA Subscription items that are in a multiple OPC UA server configuration, information is displayed in this format:
Multiple Servers (<Number of OPC UA Servers>)
where:
-
<Number of OPC UA Servers>refers to the number of OPC UA Servers that are specified on the configuration Form of the OPC UA Subscription (see Configure the Server and Publishing Properties).Use the Current Server status attribute to determine the name of the OPC UA Server that the subscription is currently using.
For OPC UA Points that are in a single OPC UA server configuration, information is displayed in this format:
<Server URL>: <Point Type> Item '<Node Address>' [<Array Element>], Bits <Number of Bits>
where:
-
[<Array Element>]is only included if the OPC UA Point is configured to represent an element in an array (see Configure the Common Point Properties). -
Bits <Number of Bits>is only included if the point is a digital point.
For OPC UA Points that are in a multiple OPC UA server configuration, information is displayed in this format:
Multiple Servers (<Number of OPC UA Servers>): <Point Type> Item '<Node Address>' [<Array Element>], Bits <Number of Bits>
where:
-
<Number of OPC UA Servers>refers to the number of OPC UA Servers that are specified on the configuration Form of the OPC UA Subscription that handles the point (see Configure the Server and Publishing Properties).Use the Current Server status attribute (on the OPC UA Subscription item) to determine the name of the OPC UA Server that the subscription is currently using.
-
[<Array Element>]is only included if the OPC UA Point is configured to represent an element in an array (see Configure the Common Point Properties). -
Bits <Number of Bits>is only included if the point is a digital point.
An OPC UA Subscription item that is configured to connect to a single OPC UA server might have a Source such as:
opc.tcp://OPC-UASERVERb:12345
(For a subscription that is configured to connect to a single OPC UA server, which has the above URL.)
An OPC UA Digital Point that uses the above subscription might have a Source such as:
opc.tcp://OPC-UASERVERb:12345: Digital Item 'nsu=https://def', Bits 1
(The information that is enclosed within single straight quotation marks indicates the address of the node in the OPC UA server's address space. The number of bits indicates that the point is a 1-bit digital point.)
An OPC UA Analog Point that uses a subscription that is configured to connect to any of three OPC UA servers might have a Source such as:
Multiple Servers (3): Analog Item 'nsu=https://abc' [4]
(For an analog point that represents the fifth element in an array. The index to the array starts at zero, so the fifth element is 4.)