This ObjectTypedefines a type for files. It is formally defined in Table 1.

Table 1– FileType

Attribute	Value
BrowseName	FileType
IsAbstract	False
References		NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseObjectType defined in OPC 10000-5
HasProperty		Variable	Size	UInt64	PropertyType	Mandatory
HasProperty		Variable	Writable	Boolean	PropertyType	Mandatory
HasProperty		Variable	UserWritable	Boolean	PropertyType	Mandatory
HasProperty		Variable	OpenCount	UInt16	PropertyType	Mandatory
HasProperty		Variable	MimeType	String	PropertyType	Optional
HasComponent		Method	Open	Defined in 4.2.2		Mandatory
HasComponent		Method	Close	Defined in 4.2.3		Mandatory
HasComponent		Method	Read	Defined in 4.2.4		Mandatory
HasComponent		Method	Write	Defined in 4.2.5		Mandatory
HasComponent		Method	GetPosition	Defined in 4.2.6		Mandatory
HasComponent		Method	SetPosition	Defined in 4.2.7		Mandatory
HasProperty		Variable	MaxByteStringLength	UInt32	PropertyType	Optional
HasProperty		Variable	LastModifiedTime	DateTime	PropertyType	Optional
Conformance Units
Base Info FileType Base

Sizedefines the size of the file in Bytes. When a file is opened for write the size might not be accurate. If the Servercan not accurately determine the size of the file, the Size Propertyshall be returned to a Clientwith a StatusCodeof Bad_NotSupported.

Writableindicates whether the file is writable. It does not take any user access rights into account, i.e. although the file is writable this may be restricted to a certain user / user group. The Propertydoes not consider whether the file is currently opened for writing by another client and thus currently locked and not writable by others.

UserWritableindicates whether the file is writable taking user access rights into account. The Property does not consider whether the file is currently opened for writing by another client and thus currently locked and not writable by others.

OpenCountindicates the number of currently valid file handles on the file.

The optional Property MimeTypecontains the media type of the file based on RFC 2046.

Note that all Methodson a file require a fileHandle, which is returned in the Open Method.

The optional MaxByteStringLength Propertyindicates the maximum number of bytes of the read and write buffers. If this Propertyis not present then the maximum size is defined by the MaxByteStringLength Propertyof the ServerCapabilitiesTypedefined in OPC 10000-5.

The optional LastModifiedTime Propertyindicates the time the file was last modified. The Propertyshall be updated whenever the Serverdetects that the file has changed.