OPC-UA

Characteristics - OPC-UA

OPC (Open Platform Communications) enables access to machines, devices and other systems in a standardized way. To learn more about the standard visit the OPC-UA website.

Information Model Requirements

• The following Node Types can be used to model data structures:

  • Variables with a Simple Data Type.

  • Variables with a Custom Data Type.

Configuration - OPC-UA Client

1. Select OPC UA Client as Channel Type.

2. Click the Configure button.

3. Make sure the root model node is selected to configure the OPC-UA Client

4. Enter an Application name

5. Input the TcpConfiguration

• Enter an IP address

• Enter the Port

• Define an Endpoint

• Set a Request timeout

6. Configure the defaultSubscriptionAttribute

• Define a Publishing interval and select the Unit

7. Configure monitoringParameters

• Set a Sampling interval and the Unit

• Enter a Queue size

• Enable Discard oldest depending on the use case

8. Enable Subscription Groups depending on the use case

9. Input the Group name

10. Define a Publishing interval and select the Unit

11. Set a Sampling interval and the Unit

12. Enter a Queue size

13. Enable Discard oldest depending on the use case

14. Select the complex variable node.

15. Enable the Node configuration

16. Assign OPC-UA data block variables to corresponding variables in the Information Model by selecting the variable in the tree

17. Assign data block

• Enable the Nodes configuration checkbox

• Enter the Node Id

Description of configuration properties:

Property	Description	Example
IP Address	Client IP	127.0.0.1
Port	Client port	4840
Endpoint path	Service name at the server endpoint	demo
Publishing interval	Interval in which Notification Messages are sent	1
Sampling interval	Sampling interval of monitored items	10
Queue size	Max number of messages stored in the publish queue	1
Node id	Id of the item	s='DB_Processing_Module'

Configuration - OPC-UA Server

1. Select OPC UA Server as Channel Type.

2. Click the Configure button.

3. Make sure the root model node is selected to configure the OPC-UA Server

4. Enter an application Name

5. Configure TCP

• Enter an Ip Address

• Enter the Port

• Define an Endpoint

6. Configure the NameSpace

• Provide a Root node name

7. Configure the variable sampling interval

• Set the Initial delay in milliseconds

• Input the Sampling rate in milliseconds

Description of configuration properties:

Property	Description	Example
IP Address	Server IP	127.0.0.1
Port	Server port	4840
Endpoint path	Service name at the server endpoint	demo
Root node name	The name of the top-level node in the OPC UA server’s address space	PLC
Initial delay	The time the OPC UA client/server should wait before attempting to connect to the OPC UA server	10
Sampling rate	The rate at which the OPC UA client/server requests data from the OPC UA server	1