====OPC-UA Driver===

===Information===

OPC-UA is the replacement for the older **OPC-DA** standard.

^Driver Info^Detail^
|Driver Type:|**Live Only**|
|Platforms:|**All**|

===Driver Settings===

This driver has two options.

^Option^Description^
|Address|The address of the OPC-UA host machine, including the port number|
|Namespace|The ID of the namespace node (usually **2** or **3**)|

===Point Settings===

OPC-UA points only have one setting - the **full address** of the point. 

This is made up of a path of objects seperated by a slash (/) symbol, then a period (.) between the last object and its property.

UA points for a hierarchy - for instance, you might have a UA object called the **Main Motor**, which contains a **Cooling System** which in turn has a property called **Outlet Temperature**. The final UA point name would be...

<code>
Main Motor/Cooling System.Outlet Temperature
</code>

===Performance Note===

Some OPC-UA servers only support specific parts of the OPC-UA standard.

For this reason, the ARDI OPC-UA drivers use a slower but much more reliable search method when connecting. This makes the //connection// phase quite slow when you have large UA servers.

However, once the connection is completely stablished, OPC-UA is one of the fastest-update methods available, and has the least impact on your network. This is because OPC-UA is a //subscription// protocol - it only transmits **changes** to your data rather than needing to be constantly re-polled.