Siemens S7-1500 Function Manual page 23

Memory areas and retentive memory
2.2 Memory requirements and memory usage
Display of the memory utilization in STEP 7
In online mode, the online function "Memory" provides you with the following up-to-date
memory information:
● Size of the total free and already allocated load memory on the SIMATIC memory card.
● Size of the total free and already allocated work memory, separated by code and data.
● Size of the total free and already allocated retentive memory.
The online function "Memory" can be found in Online & Diagnostics under "Diagnostics >
Memory". You can access the functions under Online & Diagnostics in various ways:
● In the project tree under each configured CPU.
● In the project tree under Online access > Accessible devices, in order to display the
memory utilization of CPUs that were not configured in the project.
● In all views of the device configuration (topology view, network view, device view) by
selecting a CPU with the right mouse button.
Figure 2-3
Note
Fill levels of the CPUs of the redundant system S7-1500R/H
The CPUs of the redundant system S7-1500R/H can have CPU-specific fill levels in non-
redundant operation.
The fill levels of the load memory of the CPUs can differ in redundant operation and non-
redundant operation (e.g. due to stored PDF files or SIMATIC memory cards of different
sizes).
You can have the memory utilization of both CPU 1 and CPU 2 displayed in STEP 7.
Alternatively to the "Memory" online function, you will also find a display of the current
memory functions on the "Online tools" task card in the "Memory" section.
22
"Memory" online function
Structure and Use of the CPU Memory
Function Manual, 10/2018, A5E03461664-AC