UA Part 14: PubSub - 6.2.10 Information flow and status handling

6.2.10 Information flow and status handling

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

The parameters and behaviour relevant for the encoding of a DataSetMessageon the Publisherside and the decoding of the DataSetMessageon the Subscriberside are defined in 6.2.3.1together with the DataSetFieldContentMask.

Figure 22– PubSub Information Flow

The mapping of source value and status to the DataSetin the Publisherdepends 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 StatusCodeis 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 DataSeton the Subscriberside to the value and status of the target Variabledepends 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_*	OverrideValue_2	Value 2	Operational_2	Value 1	Uncertain_*
Null	Bad_*	OverrideValue_2	Value 2	Operational_2	Value 2	Good_LocalOverride
Value 1	Good_*	LastUsableValue_1	Null	Operational_2	Value 1	Good_*
Value 1	Uncertain_*	LastUsableValue_1	Null	Operational_2	Value 1	Uncertain_*
Null	Bad_*	LastUsableValue_1	Null	Operational_2	LastValue(2)	Uncertain_LastUsableValue
Value 1	Good_*	Disabled_0	Null	Operational_2	Value 1	Good_*
Value 1	Uncertain_*	Disabled_0	Null	Operational_2	Value 1	Uncertain_*
Null	Bad_*	Disabled_0	Null	Operational_2	Null	Bad_*
No message received. The target values are updated once after a reader state change.		OverrideValue_2	Value 2	Diabled_0 Paused_1	Value 2	Good_LocalOverride
		LastUsableValue_1	Null	Diabled_0 Paused_1	LastValue(2)	Uncertain_LastUsableValue
		Disabled_0	Null	Diabled_0 Paused_1	Null	Bad_OutOfService
		OverrideValue_2	Value 2	Error_3	Value 2	Good_LocalOverride
		LastUsableValue_1	Null	Error_3	LastValue(2)	Uncertain_LastUsableValue
		Disabled_0	Null	Error_3	Null	Bad_NoCommunication
Note 1: If no specific StatusCodeis 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.