The OPEN-SCS model for aggregation management when adapted to OPC UA results in two methods attached to an aggregation manager object.

The aggregation manager receives unsolicited events through the aggregation methods. The aggregation methods have the same method signature. The specific methods supported by an aggregation manager are defined in profiles.

image018.png

Figure 14 – Aggregation Manager Methods and Data

Table 42 is the AddressSpace definition of an OPENSCSAggregationManagerObjectType.

Table 42 – OPENSCSAggregationManagerObjectType AddressSpace Definition

Attribute

Value

BrowseName

OPENSCSAggregationManagerObjectType

IsAbstract

False

References

NodeClass

BrowseName

Data Type

TypeDefinition

Other

Subtype of the BaseObjectType defined in OPC 10000-5

0:HasComponent

Method

AggregationPackingEvent

See 6.3.3.1.

M

0:HasComponent

Method

AggregationUnpackingEvent

See 6.3.3.2.

M

0:HasProperty

Variable

MaxAggregationEvents

0:UInt32

0:PropertyType

M

MaxAggregationEvents - Defines a read-only maximum number of AggregationElements for packing and unpacking events which can be received in a single method call.

AggregationPackingEvent – This method is used to send unsolicited notification of Aggregation Packing events to an OPC Server that is performing aggregation management.

The signature of this Method is specified below. Table 43 and Table 44 specify the Arguments and AddressSpace representation, respectively.

Signature

AggregationPackingEvent (

[in] OPENSCSAggregationDataType[] AggregationElement

[in] String ParentSNFormat

[in] String PackedElementSNFormat

[in] OPENSCSKeyValueDataType[] AggregationContext

[out] OPENSCSReturnEnum ReturnStatus

);

Table 43 – AggregationPackingEvent Method Arguments

Argument

Description

AggregationElement

Specifies the parent element and the packed element collection that is to be added to the parent element.

ParentSNFormat

Defines the format of the parent Serial Numbers associated to the event.

PackedElementSNFormat

Defines the format of the packed element Serial Numbers associated to the event.

AggregationContext

Zero or mode key value pairs that define additional context information for the event, such as order number or lot number.

ReturnStatus

Returns the status of the method execution.

Method Result Codes are defined as part of the Call service (see OPC 10000-4 and Table 95).

Table 44 – AggregationPackingEvent Method AddressSpace Definition

Attribute

Value

BrowseName

AggregationPackingEvent

IsAbstract

True

References

NodeClass

BrowseName

DataType

TypeDefinition

ModellingRule

0:HasProperty

Variable

InputArguments

Argument[]

0:PropertyType

Mandatory

0:HasProperty

Variable

OutputArguments

Argument[]

0:PropertyType

Mandatory

AggregationUnpackingEvent – This method is used to send unsolicited notification of Aggregation Unpacking events to an OPC Server that is performing aggregation management.

The signature of this Method is specified below. Table 45 and Table 46 specify the Arguments and AddressSpace representation, respectively.

Signature

AggregationUnpackingEvent (

[in] OPENSCSAggregationDataType[] AggregationElement

[in] String ParentSNFormat

[in] String PackedElementSNFormat

[in] OPENSCSKeyValueDataType[] AggregationContext

[out] OPENSCSReturnEnum ReturnStatus

);

Table 45 – AggregationUnpackingEvent Method Arguments

Argument

Description

AggregationElement

Specifies the parent element and the packed element collection that is to be removed from the parent element.

ParentSNFormat

See 6.3.3.1

PackedElementSNFormat

See 6.3.3.1

AggregationContext

See 6.3.3.1

ReturnStatus

See 6.3.3.1

Method Result Codes are defined as part of the Call service (see OPC 10000-4 and Table 95).

Table 46 – AggregationUnpackingEvent Method AddressSpace Definition

Attribute

Value

BrowseName

AggregationUnpackingEvent

IsAbstract

True

References

NodeClass

BrowseName

DataType

TypeDefinition

ModellingRule

0:HasProperty

Variable

InputArguments

Argument[]

0:PropertyType

Mandatory

0:HasProperty

Variable

OutputArguments

Argument[]

0:PropertyType

Mandatory