Are some specified types like 'Range' with only a min- or max-value available? | OPC UA Standard | Forum

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Are some specified types like 'Range' with only a min- or max-value available?

Martin Lang

Germany

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06/25/2014

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04/28/2016 - 07:58

Hello all,

UA Spec. Part 8, 5.6.2 defines the DataType 'Range'.
Our server implementation use this DataType in relation with the 'DataItemTypes' and it derivates successful.
During server testing a for us new use case occurs.
Assumption, a value will only specified with a max-value and no min-value with intent.
So the 'Range' property is probably not the right meta information. To fill the min-value with the minimum which is given by the used data type (for example SByte_Min = -128) looks not really nice and is probably not wanted/allowed by costumers solution.
Within the UA Specifications we found no DataType like 'MaxLimit' or 'MinLimit' to represent this meta information in a OPC UA specified way.

Did we miss the suitable definition within the UA Specifications?

Regards,
Martin

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05/02/2016 - 03:55

Martin,

there is no Property to specify just a MaxLimit. You will have to define it yourself or just use 'Range' with the biggest negative number for the lowRange.

If you think this is a common use case you could enter a feature request into Mantis.

-Karl

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