RUT901 OPC UA

The information in this page is updated in accordance with firmware version RUT9M_R_00.07.10.2.

Summary

OPC Unified Architecture (OPC UA) is a cross-platform, open-source, IEC62541 standard for data exchange from sensors to cloud applications developed by the OPC Foundation. The UA in OPC UA stands for “Unified Architecture” and refers to the latest specification of the standard. It differs from its predecessor in that it is platform-independent, moving away from COM/DCOM to purely binary TCP/IP or alternatively SOAP.

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This manual page provides an overview of the OPC UA functionality in RUT901 devices.

Note: OPC UA is additional software that can be installed from the System → Package Manager page.

OPC UA Servers

The OPC Server is the basis of OPC communication. It is a software that implements the OPC standard and thus provides the standardized OPC interfaces to the outside world.

Notice the Global section config. It is used to outright turn the service off or on if any active configurations are present.

Clicking the Cog icon opens a modal window. The global configuration slider can be set and it's state saved.

To add a new server, enter an instance name and click the 'Add' button.

Note: A maximum of 10 servers is allowed.

After clicking 'Add' you will be redirected to the newly added server's configuration page.

Status

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This section displays OPC UA Client general status information..

OPC UA Server Configuration

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The OPC UA Server Configuration section is used to configure the parameters of an OPC UA Server.

Field	Value	Description
Enable	off | on; default: off	Enables specific OPC UA server instance.
Name	string; default: none	Name of the server, used for management purposes only.
URL	url; default: none	Specifies OPC UA endpoint URL.
Timeout	integer [10..3600000]; default: 5000	Specifies server timeout in ms.
Identity	Anonymous | Credentials  ; default: Anonymous	Specifies client identity.
Username	string ; default: empty	Specifies client username.
Password	string; default: empty	Specifies client password.
Security mode	None | Sign | Sign & encrypt; default: None	OPC UA security mode.
Application URI	string; default: empty	Should match SubjectAlternativeName in client certificate.
Certificate	.ca file; default: none	Client certificate.
Key	.key file; default: none	Client key.
TCL	file; default: none	Trusted certificate list. A TCL is a list of hashes of certificates or a list of file names.

OPC UA Server Nodes

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A node is the basic unit of data in the OPC UA address space, which provides a standard way for OPC UA servers to represent objects to OPC UA clients. Nodes are pieces of information (for example, a unique temperature) and consist of attributes, the actual data value, and one or more references to other nodes, each in its own address space. A unique temperature will therefore take up multiple addresses in an address space.

By default, there are no nodes configured. To add a new server node, enter an instance name and click the 'Add' button.

Note: A maximum of 50 nodes per server are allowed.

After clicking 'Add' you will be redirected to the newly added server node's configuration page.

OPC UA Server Node Configuration

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The OPC UA Server node Configuration section is used to configure the parameters of an OPC UA Server Node.

Field	Value	Description
Name	string; default: none	Name of the node instance, used for management purposes only.
ID namespace	integer [0..65535]; default: none	Specifies node ID namespace.
ID type	Numeric | String | GUID | Bytestring; default: Numeric	Specifies node ID type.
ID	dynamic; default: none	Specifies node ID (validation varies depending on ID type).

OPC UA Value Groups

A Value Group is a collection of different specific group values. Each value configured under this group will be returned inside the same group array.

By default, there are no value groups configured. To add a new group, enter an instance name and click the 'Add' button.

Note: A maximum of 20 value groups are allowed.

After clicking 'Add' you will be redirected to the newly added value group's configuration page.

OPC UA Value Group Configuration

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The OPC UA Value Group Configuration section is used to configure the parameters of an OPC UA Value Group.

Field	Value	Description
Enable	off | on; default: off	Enables specific OPC UA value group instance.
Name	string; default: none	Name of the value group instance, used for management purposes only.
Scheduling type	Period; default: Period	Specifies method of scheduling data retrievals.
Period	integer [1..86400]; default: none	Specifies time duration between data retrievals in seconds.
Failure mode	None | Any | All; default: None	When to consider retrieval a failure.
Failure storage	off | on; default: off	Whether to store results of a failure.
Failure replacement	string; default: none	Results of a failure will be replaced by this string
Prefix	string; default: none	String going before all the values.
Midfix	string; default: none	String going between all the values.
Postfix	string; default: none	String going after all the values.

OPC UA Group Values

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A Group Value is a specific value retrieved from a defined server node.

By default, there are no group values configured. To add a new value, enter an instance name and click the 'Add' button.

Note: A maximum of 50 values per value group is allowed.

After clicking 'Add' you will be redirected to the newly added group value's configuration page.

OPC UA Group Value Configuration

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The OPC UA Group Value Configuration section is used to configure the parameters of an OPC UA Group Value.

Field	Value	Description
Enable	off | on; default: off	Enables specific OPC UA value instance.
Name	string; default: none	Name of the group value instance, used for management purposes only.
Prefix	string; default: none	String before the value.
Postfix	string; default: none	String after the value.
Replacement	string; default: none	String to replace everything in case of failure.
Server to retrieve data from	OPC UA server instance; default: none	Specifies which server to retrieve data from.
Server node	OPC UA server node instance; default: none	Specifies which server node to retrieve data from.