The parameter NetworkMessageNumberwith the DataType UInt16is the number of the NetworkMessageinside a PublishingIntervalin which this DataSetMessageis published. The default value is 0 and indicates that the number of the NetworkMessageis not fixed.

The NetworkMessageshall have a fixed layout if the PayloadHeaderflag in the NetworkMessageContentMaskis false.

If the NetworkMessagelayout is fixed and all DataSetMessagesof a WriterGroupfit into one single NetworkMessage, the value of NetworkMessageNumbershall be 1. If the DataSetMessagesof a WriterGroupare distributed or chunked over more than one NetworkMessage, the first NetworkMessagein a PublishingIntervalshall be generated with the value 1, the following NetworkMessagesshall be generated with incrementing NetworkMessageNumbers. To avoid a roll-over the number of NetworkMessagesgenerated from one WriterGroupwithin one PublishingIntervalis limited to 65535.