SNRequestUnassigned –This method requests unallocated serial numbers from an OPC UA Server that is performing serial number management for a specific Serial Number Pool.

The signature of this Method is specified below. Table 7 and Table 8 specify the Arguments and AddressSpace representation, respectively.

Signature

SNRequestUnallocated (

[in]String SNCollectionID

[in]UInt32 Count

[in]String SNFormat

[in]OPENSCSKeyValueDataType[]PoolSelectionCriteria

[in]String RequestToken

[out]OPENSCSReturnEnum ReturnStatus

[out]OPENSCSSNCollectionDataType SNCollection

[out]String ReturnedRequestToken

);

Table 7 – SNRequestUnallocated Method Arguments

Argument	Description
SNCollectionID	See 6.3.1.2.
Count	See 6.3.1.2.
SNFormat	See 6.3.1.2.
PoolSelectionCriteria	See 6.3.1.2.
RequestToken	See 6.3.1.2.
ReturnStatus	See 6.3.1.2.
SNCollection	See 6.3.1.2.
ReturnedRequestToken	See 6.3.1.2.

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

Table 8 – SNRequestUnallocated Method AddressSpace Definition

Attribute	Value
BrowseName	SNRequestUnallocated
IsAbstract	True
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
0:HasProperty	Variable	InputArguments	Argument[]	0:PropertyType	Mandatory
0:HasProperty	Variable	OutputArguments	Argument[]	0:PropertyType	Mandatory