Siemens SIMATIC S7-1500 System Manual page 383

Commissioning
12.4 Operating and system states
Overview of system and operating states
The figure below shows the possible operating states of the CPUs and the resulting system
states.
In general, the two CPUs have equal priority; each CPU can be either primary or backup.
Figure 12-6 System and operating states
382
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF