Siemens SIMATIC PCS 7 CPU 410-5H System Manual page 255

Options for terminating the communication connection
The following events are available for terminating communication connections:
● You program the termination of the communication connection with FB 66 "TDISCON".
● The CPU state changes from RUN to STOP.
● At POWER OFF / POWER ON
Connection diagnostics
In Step 7, you can read detailed information on the configured connections by selecting
"Module state -> Communication -> Open communication over Industrial Ethernet".
Reference
For detailed information on the blocks described above, refer to the
CPU 410-5H Process Automation
System Manual, 09/2014, A5E31622160-AB
Supplementary information
15.6 Communication services
STEP 7 Online Help.
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