Siemens SIMATIC PCS 7 CPU 410-5H System Manual page 284

Supplementary information
15.12 Link-up and update sequence
Flow chart of the link-up and update operation
The figure below outlines the general sequence of the link-up and update. In the initial
situation, the master is in solo operation. In the figure, CPU 0 is assumed to be the master
CPU.
Figure 15-22 Sequence of link-up and update
*) If the "Switchover to CPU with modified configuration" option is set, the content of the load
memory is not copied; what is copied from the user program blocks of the work memory
(OBs, FCs, FBs, DBs, SDBs) of the master CPU is listed in Chapter Switch to CPU with
modified configuration (Page 291)
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CPU 410-5H Process Automation
System Manual, 09/2014, A5E31622160-AB