Siemens Simatic S7-1500R System Manual page 209

Commissioning
9.4 Operating and system states
①
Copying the SIMATIC memory card
The primary CPU copies parts of the load memory to the backup CPU:
● User program, system blocks and project data of the CPU from the \SIMATIC.S7S folder
Note
Overwriting load memory content
Copying overwrites the load memory contents on the SIMATIC memory card of the backup
CPU with the content of the primary CPU load memory.
The display of the primary CPU indicates the operating state.
Table 9- 5
208
Copying the SIMATIC memory card
Primary CPU Backup CPU
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA