Siemens SIMATIC CPU 410 System Manual page 350

Supplementary information
18.13 Link-up and update sequence
Communication functions and resulting jobs
After it has received one of the jobs specified below, the CPU must in turn generate
communication jobs and output them to other modules. These include, for example, jobs for
reading or writing parameterization data records from/to distributed I/O modules. These jobs
are rejected until the update is completed.
● Reading/writing of data records using HMI functions
● Reading data records using SSL information
● Disabling and enabling messages
● Logon and logoff for messages
● Acknowledgement of messages
Note
The last three of the functions listed are registered by a WinCC system, and automatically
repeated when the update is completed.
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CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC