OpcUaServerValue – Expose value as an OPC UA Node

Block SymbolLicensing group: ADVANCED

Function Description

This function block depends on the OpcUa driver. Please read the OpcUaDrv manual [12] before use.

The OpcUaServerValue block exposes an OPC UA Node through OPC UA server driver.

The first two parameters are NodeId and NodeId_type. The NodeId_type specifies how the value entered as the NodeId parameter should be treated. The parameter NodeId specifies the NodeId that the OPC UA Node represented by the block should be exposed with.

The input DISABLE controls whether the OPC UA Node is exposed on the server or not. When the SET input is set to on the value on the input uValue port is set to the OPC UA Node’s value. If the parameter READONLY is set to off the Node’s value can also be changed from outside of the algorithm through the OPC UA communication protocol.

The output signal yValue is set to the Node’s value on every tick. The parameter type specifies the Node’s value data type, the data type of the uValue input and yValue output.

Inputs

uValue	Input signal	Unknown
SET	Set the input value to OPC UA Node value	Bool
DISABLE	Disable OPC UA Node	Bool

Parameters

NodeId	OPC UA Node Id	String
NodeId_type	OPC UA Node Id type $⊙$ 1	String
	1 .... string 2 .... numeric 3 .... guid
type	Value data type $⊙$ 1	Long (I32)
	1 .... string 2 .... double 3 .... long 4 .... bool
BrowseName	OPC UA Node Browse name	String
Description	OPC UA Node description	String
DisplayName	OPC UA Node display name	String
READONLY	Set OPC Node value as read only $⊙$ on	Bool

Outputs

yValue	Output signal	Unknown
CHANGED	Value of the node changed though the OPC UA protocol	Bool
errId	Error code	Error

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