Symbol

[ Class ]

Access to symbol information.

Constructors

Name	Description
constructor	Creates an instance of the symbol.

Functions

Name	Description
read	Reads the value of the symbol.
readEx	Reads the value of the symbol.
write	Writes the value of the symbol.
watch	Monitors the symbol for changes.
resolveAttributes	Returns a list of attributes from the schema of the corresponding symbol. This function can be used to obtain a list of attributes of a PLC symbol.
resolveAttribute	Returns a specific attribute from the schema of the corresponding symbol. This function can be used to obtain a specific attribute of a PLC symbol.
exists	Checks if the symbol exists.
resolveSchema	Resolves the schema of the symbol and returns it using the callback function.
getExpression	Returns the TcHmi.SymbolExpression object associated with the symbol.
destroy	Destroys the Object symbol.

Static functions

Name	Description
read	Reads the value of a symbol addressed by its name and symbol type.
readEx	Reads the value of a symbol addressed via the symbol expression.
readEx2	Reads the value of a symbol addressed via the symbol expression.
write	Writes the value of a symbol addressed by its name and symbol type.
writeEx	Writes the value of a symbol addressed via the symbol expression.
resolveAttributes	Returns a list of attributes from the schema of the corresponding symbol. This function can be used to obtain a list of attributes of a PLC symbol.
resolveAttribute	Returns a specific attribute from the schema of the corresponding symbol. This function can be used to obtain a specific attribute of a PLC symbol.
exists	Checks if the symbol exists.
resolveSchema	Resolves the schema of the symbol and returns it using the callback function.
isSymbolExpression	Checks whether an expression is a valid symbol expression.

Interfaces

Name	Description
IReadResultObject	Extends TcHmi.IResultObject
IServerReadResultObject	Extends IReadResultObject
IWriteResultObject	Extends TcHmi.IResultObject
IServerWriteResultObject	Extends IWriteResultObject
IWatchResultObject	Extends TcHmi.IResultObject
IServerWatchResultObject	Extends IWatchResultObject
ISchemaResultObject	Extends TcHmi.IResultObject
IExistsResultObject	Extends TcHmi.IResultObject
IAttributesResultObject	Extends TcHmi.IResultObject
IAttributeResultObject	Extends TcHmi.IResultObject

	Available from 1.8