Siemens SIMATIC S7-1500 System Manual page 255

Figure 11-3 Assigning redundancy IDs
Reading redundancy IDs from the display
As well as assigning redundancy IDs over the display, you can read out the redundancy ID
with the menu command "Overview > Redundancy". The display always shows the
redundancy ID of the CPU on whose display you query the redundancy ID.
Switching redundancy IDs over the display
Since each of the CPUs already has its own redundancy ID, you can exchange the redundancy
IDs of the CPUs for each other if required.
Switching redundancy IDs can, for example, be useful in the following situations:
• You only have access to one of the two CPUs.
• You have incorrectly assigned the redundancy IDs.
NOTE
Switching the redundancy IDs switches the assignment of the real CPUs to the project
trees in the project navigation.
If the two real CPUs contain the same project, switching the redundancy IDs switches all
configured properties between the CPUs. These include, for example, the IP addresses of the
PROFINET interfaces, the device names and the configured topology.
On the display, you can exchange on only one CPU the redundancy IDs already assigned for
both CPUs.
Proceed as follows to switch the redundancy IDs:
1. Make sure that both CPUs are in STOP operating state:
2. Make sure that the two CPUs are connected to each other.
3. Change the redundancy ID of a CPU using the display.
Result: Once the redundancy ID has been changed on one CPU, both CPUs restart and each
now has the previous redundancy ID of the other.
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
Commissioning
11.3 Commissioning procedure
255