Siemens Simatic S7-1500R System Manual page 197

Commissioning
9.3 Commissioning procedure
Detailed procedure for download to the backup CPU:
1. Right-click to select the S7-1500R/H system in the project tree.
2. Select "Hardware and software (changes only)" under "Download to backup CPU".
The backup CPU is now selected instead of the primary CPU in the "Extended download"
dialog window.
Figure 9-5
Load user program in RUN-Solo system state
The redundant system is in the RUN-Redundant system state. You can download a modified
user program to the primary CPU. Advantage: During downloading, the primary CPU
maintains control of the process. There is no plant downtime.
Proceed as follows to download the user program in RUN:
1. Switch the backup CPU to the STOP operating state. The S7-1500R/H system switches
to RUN-Solo system state.
2. Download the modified user program to the primary CPU with "Download to device" >
"Software (changes only)". The primary CPU continues to control the process.
3. Switch the backup CPU to the RUN operating state.
The primary CPU remains in the RUN operating state and synchronizes the modified user
program with the backup CPU in SYNCUP.
Result: The S7-1500R/H system switches back to redundant mode with the modified user
program.
196
"Extended download" dialog window (backup CPU)
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA