Siemens S7-1500 Function Manual page 25

Memory areas and retentive memory
2.2 Memory requirements and memory usage
Note
Display of the memory utilization of redundant system S7-1500R/H in non-redundant
operation
The CPU displays indicate the local memory utilization of the respective CPU.
Display of the memory utilization of redundant system S7-1500R/H in redundant operation
Irrespective of the sizes of the inserted SIMATIC memory cards, both CPU displays indicate
the same (synchronized) fill level.
24
Structure and Use of the CPU Memory
Function Manual, 10/2018, A5E03461664-AC