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.