|Name||A name used to identify this connection.|
|Description||Short description of this connection.|
|Enabled||Disable the connection to the OPC server.|
|Read-only||Puts the connection into read-only mode. All writes sent to this server will fail.|
|Username||A username the connection will use when authenticating with the UA server.|
|Password Fields||The password to use when authenticating with the UA server.|
|Host Override||When specified, if the endpoint address returned by the OPC server has a different IP address or hostname than the discovered endpoint, the overridden value will be used. Expects just an IP address or hostname, for example: 192.168.1.10|
The timeout, in milliseconds, when opening a socket connection to a remote host. Default is 5,000.
The timeout, in milliseconds, to wait for an Acknowledge message in response to the client's Hello message. Default is 5,000.
|Request Timeout||Maximum amount of time, in milliseconds, to wait for the response to a request. Default is 60,000.|
|Session Timeout||Requested session timeout value, in milliseconds. Default is 120,000.|
|Max Per Operation||Specify the maximum number of nodes to read, write, subscribe, or unsubscribe to in any given UA server request. Default is 8,192.|
|Max References Per Node|
Configures the number of references per node. A "node" in this case is any item inside of a UA server, so items like tags and folders would qualify as a node, while a References is simply a reference to another node. This setting is useful in situations where the address space is completely flat, so a large number of adjacent nodes could potentially run into a maximum message size. In these cases increasing the value of this property can be useful.
However, most systems will not need to change this setting. Defaults to 8,192 references.
|Max Pending Publish Requests|
The number of concurrent Publish Requests allowed to be pending at any given time. Default is 2.
|Max Notifications Per Publish||The maximum number of notifications per publish. Default is 65,535.|
|Max Message Size||The maximum allowable size of an OPC UA application layer message. Default is 33,554,432.|
|Max Array Length||The maximum allowable size for arrays. Default is 2,147,483,647.|
|Max String Length|
The maximum allowable size for strings. Default is 2,147,483,647.
|Type Dictionary Fragment Size||The fragment size to request when reading the server's type dictionary. Default is 8,192.|
|Keep-Alive Failures Allowed||Number of consecutive failures allowed before disconnecting. Setting this to <= 0 means consecutive failures will not cause a disconnect. Default is 1.|
|Keep-Alive Interval||Interval, in milliseconds, between keep-alive requests.|
|Keep-Alive Timeout||Max duration, in milliseconds, to wait for a response to a keep-alive request. Default is 10,000.|
The Node that browsing should originate from. Options are OBJECTS_FOLDER or ROOT_FOLDER. Most OPC UA Servers use OBJECTS_FOLDER, but some non-standard servers may require ROOT_FOLDER to browse correctly. Ignition's OPC UA Servers uses OBJECTS_FOLDER.
|Failover Enabled||Enable failover on the connection, allowing the UA client to switch to a backup server in the event the primary server is unavailable.|
|Failover Threshold||The number of retry attempts before the failover connection is used. The default is 3.|
Failover Discovery URL
The discovery URL for the backup server's OPC UA server. Expects the following format:
|Failover Endpoint URL|
The endpoint of the failover server. Example:
|Failover Host Override||When specified, if the endpoint address returned by the failover OPC server has a different IP address or hostname than the discovered endpoint, the overridden value will be used. Expects just an IP address or hostname. Example: 192.168.1.10|
|Certificate Validation Enabled|
The following feature is new in Ignition version 8.1.0
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Enables validation of server certificates. This is required by the OPC UA specification, but it may be disabled for troubleshooting or temporarily connecting to servers with invalid or untrusted certificates. Default is true.
Caution: Disabling certificate validation compromises the security of the connection.
|KeyStore Alias||The alias of the certificate and private key stored in the client KeyStore.|
|Password Fields||The password to use when authenticating with the UA server. |