Siemens SIMATIC S7-1500 System Manual page 253

In the STEP 7 project tree, each of the two CPUS is displayed with its own tree. The
redundancy ID is used to assign a project tree to the real CPU in STEP 7. The upper CPU of the
two CPUs in the project tree always has a redundancy ID of 1. The lower CPU of the two
always has a redundancy ID of 2.
Diagnostics displays are assigned to the real CPUs in the project tree in the same way.
Figure 11-2 Assignment of the redundancy IDs between project tree and real configuration
Assigning redundancy IDs to CPUs in the configuration
Requirement: The CPUs have the same firmware version and the same or compatible article
numbers.
You have the following options for assigning different redundancy IDs to the CPUs:
• Automatic assignment
• Assignment using the display
Automatic assignment
Requirement:
Both real CPUs of the redundant system have the same redundancy ID (e.g."1").
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
Commissioning
11.3 Commissioning procedure
253