Session State Transition Diagnostics - Siemens SIMATIC ET 200AL System Manual

Server states and state transitions
①, ④
②
③
Figure 9-52
Description of the server states
The individual states that the OPC UA server can assume are explained below.
Server states
Shutdown
Starting
Running
Failed
9.3.7.3

Session state transition diagnostics

Information on the session state
S7-1500 CPUs as of firmware version V2.8 are able to create an entry in the diagnostic buffer
for state changes of an OPC UA session.
The diagnostic buffer displays the new state. The corresponding session ID is also displayed.
Requirement
The "Change of session states" option (OPC UA > Server > Diagnostics) is selected in the OPC
UA properties of the CPU.
Communication
Function Manual, 05/2021, A5E03735815-AJ
POWER ON or Load in RUN, if OPC UA relevant data could be affected.
Loading the hardware configuration with deactivated OPC UA server. The server remains
shut down.
Loading the hardware configuration with activated OPC UA server and faulty OPC UA data
(for example, too many structures with the result that the type dictionary becomes too
large). In this case, the server cannot start (see ③).
OPC UA server cannot start due, for example, to faulty configuration.
Server states and state transitions
Explanation
Initial status
• After POWER ON
• After loading the hardware configuration with activated or deactivated
OPC UA server.
• After loading OPC UA relevant data
OPC UA address space in server is initialized.
OPC UA server running (normal productive state for OPC UA server).
Error state. OPC UA server cannot start due, for example, to faulty configura-
tion.
OPC UA communication
9.3 Using the S7-1500 as an OPC UA server
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