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From this moment, the server informs the client about the changes in the monitored objects by

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publish_message
publish_message
"Publish message" in the periodic intervals (that have been set in the parameters of subscription). If the monitored objects have not been changed, the server will send a "Publish message" once in (Max KeepAlive Count * Publishing Interval) seconds. The message informs the client that the subscription is still active. A similar check mechanism is also on the client-side - it will send a "Publish message" once every (Max KeepAlive Count * Publishing Interval). If the client does not send the acknowledgment "Publish message" within (LifeTime Count * Publishing Interval), the subscription will expire on the side of the server.

OPC UA communication was tested with:

  • Simatic S-7 OPC UA Server
  • Bernecker PLC embedded OPC UA Server
  • Zenon OPC UA Server

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komunikacna_linka
komunikacna_linka
Communication line configuration

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