Description

Function Description

The function block UA_ReadList is used to read values of multiple nodes using a list of node handles.

Values of node are returned in VARIABLES.

Representation in FBD

Parameter Description

Input parameters:
Name	Type	Comment
EXECUTE	BOOL	FB performs its task on rising edge on this input.
CONNECTIONHDL	DWORD	Connection handle.
NODEHDLCOUNT	UINT	Number of valid elements in the array to read.
NODEHDLS	ANY_ARRAY_DWORD	Array of Node Handles.
NODEADDINFOS	AUANodeAdditionalInfo	Array of UANodeAdditionalInfo
TIMEOUT	TIME	Time to response.

Output parameters:
Name	Type	Comment
DONE	BOOL	FB has successfully completed its task.
BUSY	BOOL	The FB is not finished and new output values are to be expected.
ERROR	BOOL	Signals that an error has occurred within the FB. Set to true is either ErrorID or any of the NodeErrorIDs indicates an error.
ERRORID	DWORD	Error code.
NODEERRORIDS	ANY_ARRAY_DWORD	Array of DWORD. Contains an error code for each valid element of the Variables array.
TIMESTAMPS	ASTTimeStamp	Contains a TimeStamp for each valid element of the Variables array. (DT Date & Time Type, Milliseconds)

Input/Output parameters:
Name	Type	Comment
VARIABLES	ASTVariable	Array of variables values.

Runtime Error

Refer to the Appendix for a list of OPC UA detected error codes.