The DataSetOrdering defines the ordering of the DataSetMessages in the NetworkMessages. Possible values for DataSetOrdering are described in Table 81. The default value is Undefined.
The DataSetOrderingType is an enumeration that specifies the possible options for the ordering of DataSetMessages inside and across NetworkMessages. The possible enumeration values are described in Table 81.
Table 81 – DataSetOrderingType values
|
Name |
Value |
Description |
|
Undefined |
0 |
The ordering of DataSetMessages is not specified. |
|
AscendingWriterId |
1 |
DataSetMessages are ordered ascending by the value of their corresponding DataSetWriterIds. |
|
AscendingWriterIdSingle |
2 |
DataSetMessages are ordered ascending by the value of their corresponding DataSetWriterIds and only one DataSetMessage is sent per NetworkMessage. |
If DataSetOrdering is Undefined any ordering between DataSets and their distribution into NetworkMessages is allowed. Ordering and distribution even may change between each PublishingInterval. If DataSetOrdering is set to AscendingWriterId, the Publisher shall fill up each NetworkMessage with DataSets with an ascending order of the related DataSetWriterIds as long as the accumulated DataSet sizes will not exceed the MaxNetworkMessageSize. The different options are shown in Figure 27.
Figure 27 – DataSetOrdering and MaxNetworkMessageSize
The DataSetOrderingType representation in the AddressSpace is defined in Table 82.
Table 82 – DataSetOrderingType definition
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Attribute |
Value |
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BrowseName |
DataSetOrderingType |
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IsAbstract |
False |
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References |
Node Class |
BrowseName |
DataType |
TypeDefinition |
Others |
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Subtype of Enumeration defined in OPC 10000-5 |
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HasProperty |
Variable |
EnumStrings |
LocalizedText [] |
PropertyType |
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Conformance Units |
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PubSub Parameters UADP |
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