Siemens SIMATIC S7-1500 System Manual page 254

Commissioning
11.3 Commissioning procedure
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 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.
4. Download the project and the hardware configuration to the CPU that you want to switch
to RUN first.
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S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD