I/O server addressing
- Last UpdatedFeb 27, 2025
- 1 minute read
All AVEVA-compatible I/O Servers use DDE addressing, which includes the following distinct parts:
-
Computer name
This is the node name of the computer running I/O Server software. -
Application name
This is the name of the application supplying data. The application name can include the name of the computer on which the application is running. -
Topic name
A topic is an application-specific subgroup of data elements. -
Item name
An item is a data value placeholder.
The format for the addressing is as follows:
\\<computername>\<applicationname>\<topicname>!<itemname>
The following table provides some examples of DDE addressing.
|
Address Information |
I/O Server |
InTouch |
Microsoft Excel |
|---|---|---|---|
|
application name |
\\Computer1\Modbus |
\\Computer1\VIEW |
\\Computer1\Excel |
|
topic name |
ModMachine5 |
Tag name |
Spreadsheet1 |
|
item name |
Status |
ReactLevel |
A1 (cell name) |
For the AVEVA Historian to acquire data from an I/O Server, the I/O Server addressing information must be added to the overall system configuration. You can use the Operations Control Management Console to manually add I/O Server definitions to the system, or you can import I/O Server definitions from existing InTouch applications.
For more information about manually adding I/O Server definitions, see Configuring I/O servers.
For more information on importing I/O Server definitions from InTouch HMI software, see Import and export tag configurations.