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8 result(s) for isOptional

• OPC-10000-3 – OPC Unified Architecture - Part 3: Address Space Model
  5.8.5.2 DataTypeRefinement Objects
  MaxStringLength is 0, Variable is allowed to be non-zero, otherwise must match IsOptional and StructureWithOptionalFields Reference to Variable either using HasFieldDescription (stays optional) HasFieldDescriptionSetMandatory (becomes mandatory) or IsDisabledOptionalField (optional ... field not used) Only allowed if IsOptional is true. Otherwise IsDisabledOptionalField and HasFieldDescriptionSetMandatory are not allowed. IsOptional and StructureWithSubtypedValues or UnionWithSubtypedValues AccessLevelEx Attribute, bit NoSubDataTypes Only allowed if IsOptional
• OPC-10000-3 – OPC Unified Architecture - Part 3: Address Space Model
  5.8.6.1 Overview
  AccessLevelEx Attribute. In fields of a structure, using subtypes is allowed when IsOptional is set and it is a StructureWithOptionalFields or the DataType is an abstract DataType like the BaseDataType
• OPC-10000-3 – OPC Unified Architecture - Part 3: Address Space Model
  7.26 HasFieldDescriptionSetMandatory
  This ReferenceType shall only be applied to fields declared as optional, i.e., fields having IsOptional set to true of Structured DataTypes with StructureType StructureWithOptionalFields
• OPC-10000-3 – OPC Unified Architecture - Part 3: Address Space Model
  7.27 IsDisabledOptionalField
  ReferenceType shall only be applied to fields declared as optional, i.e., either fields having IsOptional set to true on Structured DataTypes where the StructureType is StructureWithOptionalFields; or fields of Structured
• OPC-10000-3 – OPC Unified Architecture - Part 3: Address Space Model
  8.51 StructureField
  BaseDataType DataType or Structure DataType If the structureType is StructureWithSubtypedValues , or UnionWithSubtypedValues and the isOptional field is TRUE then the encoding of the field shall be able to transport ... valueRank is greater than 0 this field applies to each element of the array. IsOptional Boolean If the structureType is StructureWithOptionalFields this field indicates if a data type field
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  5.1.7 Structures and Unions
  StructureType to StructureWithSubtypedValues then any field with a subtype of Structure DataType and IsOptional =TRUE allows the type and any subtype of the field's DataType to be present ... field. In these cases, the values are serialized as an ExtensionObject. If IsOptional =FALSE then the field value is encoded directly according to the rules for the DataEncoding . Note that
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  F.1.2.5 Optional fields
  Variables . In other configuration Structures , AllowSubtypes is needed. Since AllowSubtypes cannot be combined with IsOptional , optional handling is done with empty arrays or null values for the used DataType
• OPC-30120 – OPC UA for IO-Link Devices and IO-Link Masters - IO-Link: OPC Unified Architecture
  12.3.2 Structure DataType
  field maxStringLength shall contain the fixedLength for Strings, otherwise "0" The field isOptional shall be "False" In addition to the structured DataType more things need