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OPC UA communication

9.3 Using the S7-1500 as an OPC UA server

Communication

Function Manual, 11/2019, A5E03735815-AH

237

Requirement

The "Change of session states" option (OPC UA > Server > Diagnostics) is selected in the

OPC UA properties of the CPU.

Example

A client transmits incorrect authentication data (for example, incorrect password) when a

connection is established. The new state of the "ActivationFailed" session is entered with the

corresponding session ID in the diagnostic buffer.

Subscription states and state transitions

①

Client connects to server, login with correct authentication data (correct credentials).

②

Client closes connection correctly.

③

Client no longer sends messages; session ends with timeout.

④

Client connects to server, login with incorrect authentication data.

Figure 9-49 Session states and state transitions

9.3.6.4 Check for security events

If the CPU diagnostics detects a security event during the OPC UA communication, it can

enter it in the diagnostic buffer.

Requirements

● S7-1500 CPUs as of firmware version 2.8

● The "Check for security events" option is activated (properties of the CPU > OPC UA >

Server > Diagnostics).

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