In Table 28, the Parameters of the ObjectType, referenced via the ParameterSet Object, are defined.

Table 28 – ParameterSet of IOLinkMasterType

References	Node Class	BrowseName	DataType	TypeDefinition	Modelling Rule
The following Parameters are also referenced by the Capabilities Object
HasComponent	Variable	MaxNumberOfPorts	Byte	BaseDataVariableType	Mandatory
HasComponent	Variable	MaxPowerSupply	Double	BaseDataVariableType	Mandatory
The following Parameters are also referenced by the Identification Object
HasComponent	Variable	ApplicationSpecificTag	String	BaseDataVariableType	Mandatory
HasComponent	Variable	FunctionTag	String	BaseDataVariableType	Mandatory
HasComponent	Variable	LocationTag	String	BaseDataVariableType	Mandatory
HasProperty	Variable	MasterType	Byte	MultiStateDiscreteType	Mandatory
The following Parameters are also referenced by the Statistics Object
HasComponent	Variable	DateOfLastStatisticsReset	DateTime	BaseDataVariableType	Optional
HasComponent	Variable	NumberOfIOLinkMasterStarts	UInt32	BaseDataVariableType	Optional

The mandatory, read-only Variable MaxNumberOfPorts shall be mapped to MaxNumberOfPorts of the MasterIdent structure defined in the SMI interface (see IO-Link Addendum).

The mandatory, read-only Variable MaxPowerSupply shall provide the overall amount of power provided together on all ports of the IO-Link Master in ampere. For example, a 4-port IO-Link Master may provide max. 2 A on each port but an overall MaxPowerSupply of 6 A, so not each port can consume 2 A at the same time. The Variable shall provide the EngineeringUnits Property defined in OPC 10000-3, having the value set to {namespaceUri = “http://www.opcfoundation.org/UA/units/un/cefact”; unitId = 4279632; displayName = {“en”,"A"}; description = {“en”, "ampere"}} (for ampere). The Property shall be read-only and have the ModellingRule Mandatory, so it is reflected on all instances.

The mandatory, writeable Variable ApplicationSpecificTag provides the same information as the ApplicationSpecificTag defined for an IO-Link Device on the IO-Link Master level. The server shall manage the value in a persistent manner. If a fieldbus mapping of the IO-Link Master exists providing the same information, consistency shall be provided by the OPC UA Server.

The mandatory, writeable Variable FunctionTag provides the same information as the FunctionTag defined on an IO-Link Device on the IO-Link Master level. The server shall manage the value in a persistent manner. If a fieldbus mapping of the IO-Link Master exists providing the same information, consistency shall be provided by the OPC UA Server.

The mandatory, writeable Variable LocationTag provides the same information as the LocationTag defined for an IO-Link Device on the IO-Link Master level. The server shall manage the value in a persistent manner. If a fieldbus mapping of the IO-Link Master exists providing the same information, consistency shall be provided by the OPC UA Server.

The mandatory, read-only Variable MasterType shall be mapped to MasterType of the MasterIdent structure defined in the SMI (see IO-Link Addendum). The Unsigned8 is mapped directly to the DataType Byte. The Variable is of VariableType MultiStateDiscreteType defined in OPC 10000-8. The mandatory Property EnumStrings of the VariableType, which is an array of LocalizedText, shall contain the content as defined in Table 29.

Table 29 – Defined elements of EnumStrings array of MasterType Variable

Element number (starting with 0)	Message (for locale “en”)
0	Unspecific
1	Master acc. V1.0
2	Master acc. V1.1

Servers are allowed to add additional entries into the EnumStrings array. Servers may provide translations of the texts in different locales.

The optional, read-only Variable DateOfLastStatisticsReset contains the timestamp of the answer to the last call of the Method ResetStatisticsOnAllPorts. The timestamp information shall be as precise as possible. If the ResetStatisticsOnAllPorts Method was never called then DateOfLastStatisticsReset indicates the startup time. The optional Variable shall be provided when the optional Method ResetStatisticsOnAllPorts is provided.

The following Variable indicates the incidents since DateOfLastStatisticsReset. The server should persist statistics, also when the IO-Link Master or the OPC UA Server is restarted. However, if the statistics become inconsistent, the server is allowed to do an internal reset. This will result in the update of DateOfLastStatisticsReset. If the value of a counting Variable becomes larger than the maximum value of the DataType, the value shall remain on the maximum value.

The optional, read-only Variable NumberOfIOLinkMasterStarts indicates how often the IO-Link Master was started since DateOfLastStatisticsReset. This includes starts on power up as well as warm starts and restarts due to errors. This variable is reset with the Method ResetStatisticsOnAllPorts to 0. When the IO-Link Master starts for the very first time, the value is 1 as it has started once.