Siemens SIMATIC S7-1500 System Manual page 371

Commissioning
12.3 Commissioning procedure
Automatic assignment
Requirement:
Both real CPUs of the redundant system have the same redundancy ID (e.g."1").
Options for automatic assignment:
• Both CPUs are in STOP. There is pairing between the two CPUs. The ERROR LEDs are
flashing red.
Procedure: Switch the left-hand CPU in the configuration to the RUN operating state.
Result: The right-hand CPU in the configuration changes its redundancy ID.
• The left-hand CPU in the configuration is in RUN operating state. The right-hand CPU in
the configuration is in STOP. Both redundancy connections are separated, therefore there
is no pairing between the two CPUs.
Procedure: Implement pairing between the two CPUs by establishing at least one
redundancy connection. Result: The right-hand CPU in the configuration changes its
redundancy ID.
• The left-hand CPU in the configuration is in RUN. The right-hand CPU in the configuration
is in POWER OFF. At least one redundancy connection is established. There is no pairing
between the two CPUs due to POWER OFF.
Procedure: POWER ON the right-hand CPU in the configuration. Result: The right-hand
CPU in the configuration changes its redundancy ID.
Assignment using the display
Requirements:
The two real CPUs in the redundant system:
• Are connected to each other
• Have redundancy ID 1
• The mode selector switches of the CPUs are in the STOP position
• Both CPUs are in POWER OFF mode
Procedure:
Proceed as follows to assign the redundancy IDs via the CPU display:
1. POWER ON the CPU to which you want to assign redundancy ID 2.
2. On the display of that CPU, select the menu command "Overview > Redundancy". Assign the
CPU redundancy ID 2.
Once you have assigned the CPU redundancy ID 2, the CPU will automatically restart.
3. Switch the other CPU POWER OFF.
370
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF