6 PubSub Communication Parameters ToC Previous Next

6.2 Common Configuration Parameters ToC Previous Next

6.2.10 Information flow and status handling ToC Previous Next

The configuration model defines different parameters that influence the information flow from Publisher to Subscriber in the case of a Bad Value Status or other error situations. Figure 22 depicts the parameters and the information flow inside a Publisher and inside a Subscriber.

The parameters and behaviour relevant for the encoding of a DataSetMessage on the Publisher side and the decoding of the DataSetMessage on the Subscriber side are defined in 6.2.3.1 together with the DataSetFieldContentMask.

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Figure 22 – PubSub Information Flow

The mapping of source value and status to the DataSet in the Publisher depends on the substitute value. The dependencies are defined in Table 47.

Table 47 – Source to message input mapping

Source Substitute Value DataSet Publisher side    
Value Status(1)   Value Status(1)
Value 1 Good_* Value 2 Value 1 Good_*
Value 1 Uncertain_*   Value 1 Uncertain_*
Null Bad_*   Value 2 Uncertain_SubstituteValue
Value 1 Good_* Null Value 1 Good_*
Value 1 Uncertain_*   Value 1 Uncertain_*
Null Bad_*   Null Bad_*
Note 1: If no specific StatusCode is used, the grouping into severity Good, Uncertain or Bad is used. In this case, the resulting Status matches the input Status.        

The mapping of the decoded DataSet on the Subscriber side to the value and status of the target Variable depends on the override value. The dependencies are defined in Table 48.

Table 48 – Message output to target mapping

Decoded DataSet Subscriber Override Value Handling Enum Override Value Reader State Target    
Value Status(1)       Value Status(1)
Value 1 Good_* OverrideValue_2 Value 2 Operational_2 Value 1 Good_*
Value 1 Uncertain_*       Value 1 Uncertain_*
Null Bad_*       Value 2 Good_LocalOverride
Value 1 Good_* LastUsableValue_1 Null   Value 1 Good_*
Value 1 Uncertain_*       Value 1 Uncertain_*
Null Bad_*       LastValue (2) Uncertain_LastUsableValue
Value 1 Good_* Disabled_0 Null   Value 1 Good_*
Value 1 Uncertain_*       Value 1 Uncertain_*
Null Bad_*       Null Bad_*
No message received.The target values are updated once after a reader state change. OverrideValue_2 Value 2 Diabled_0Paused_1 Value 2 Good_LocalOverride  
  LastUsableValue_1 Null   LastValue (2) Uncertain_LastUsableValue  
  Disabled_0 Null   Null Bad_OutOfService  
  OverrideValue_2 Value 2 Error_3 Value 2 Good_LocalOverride  
  LastUsableValue_1 Null   LastValue (2) Uncertain_LastUsableValue  
  Disabled_0 Null   Null Bad_NoCommunication  
Note 1: If no specific StatusCode is used, the grouping into severity Good, Uncertain or Bad is used. In this case, the resulting Status matches the input Status.Note 2: The last value is either the last received value or the default value for the data type if there was never a value received before.            

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