Unified Automation Forum

Hi,

We are developing a OPC UA server. We wonder how to deal with DataItemType's [Definition] property.

In part8, the description about [Definition] is
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Definition is a vendor-specific, human readable string that specifies how the value of this DataItem is calculated. Definition is non-localized and will often contain an equation that can be parsed by certain clients.
Example: Definition ::= “(TempA – 25) + TempB”
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But if this DataItem is not calculated, it is directly sampled from device.(For example, temperature)
What should we put into [Definition]?(There is no equation, and so on.)

I am looking forward your answer. Thank you!

Best Regards,
James

Hi,

The Definition property is optional and is not created if there is no useful information available.

Best Regards,
Unified Automation Support Team

Hi,

Thank you very much! I got it.
I think I should creat it for calculated node only.

Best Regards,
James

Support Team wrote:Hi,

The Definition property is optional and is not created if there is no useful information available.

Best Regards,
Unified Automation Support Team