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The next message sent by the client is "OpenSecureChannel message". It is used to establish a communication channel to exchange data. In this message, the client and server agree on what type of encrypting and signing mode will be used (either "sign and encrypt" or "encrypt" only). OPCUA client in the D2000 System supports only unencrypted mode.

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

Kotva
publish_message publish_message

"Publish message" in the periodic intervals (that have been set in the parameters of the 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 is still active. A similar check mechanism is also on the client - side - it will send a "Publish request" 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.

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

Forced disconnection: If all stations on the line are in the simulation mode or the communication is stopped for them, the line will be disconnected (the communication socket will be closed). If the simulation is disabled for at least one station and the communication is not stopped for it (the Parameters tab of the Station type object), the line will be connected again.

Kotva
komunikacna_linka komunikacna_linka

Communication line configuration

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