Enable Condition VI

Download PDF

Updated2023-02-21
3 minute(s) read

Enable Condition VI

Owning Palette: Alarms and Conditions VIs

Requires: OPC UA Toolkit

Moves a condition to enabled state.

Example

OPC UA client refnum in specifies the reference for the OPC UA client.

condition node ID specifies the ID of the condition node. The format of the node ID is ns=<namespace index>;<identifier type>=<identifier>. A node ID contains the following components:

namespace index is a base 10 number that indicates the namespace of the node ID.

If namespace index is 0, the format of the node ID can be <identifier type>=<identifier>. The namespace index for a node that you created with the OPC UA Toolkit is 2.
identifier type represents the type of the identifier and has the following values:

Value Identifier Type

i Numeric

s String

g GUID

b Opaque
identifier is a string value that represents the name of the identifier.

The format of the node ID can also be ns=<namespace index>;<identifier type>=<identifier>@<index>:<index>. For example, ns=2;s=Folder.Array@1:2. This format only applies to the array data type and allows you to read a single element or a range of elements of an array. You cannot use @ in a node name.

For backwards compatibility, condition node ID also accepts node paths as input for OPC UA servers only. You can regard the node path as the string type identifier of the node ID. For example, a node path can be Device.folder.item.

timeout specifies the maximum time, in milliseconds, that this VI waits to get a response from the OPC UA server. The default is 5000.

error in describes error conditions that occur before this node runs. This input provides standard error in functionality.

OPC UA client refnum out returns the reference for the OPC UA client.

service status returns the status of an OPC UA service call. OPC UA services contain parameters that are conveyed between an OPC UA client and an OPC UA server.