Siemens S7-1500 Function Manual page 50

Network 2
Detect the output DONE of "DataLogCreate", because after the execution of
"DataLogCreate" it is only set to 1 for one cycle.
Figure 3-6 Network 2
Network 3
A rising edge triggers the point in time at which new process values are stored in the MyData
structure.
Figure 3-7
Network 4
The state of the input EN is based on the point in time at which the execution of
"DataLogCreate" was completed. One execution of "DataLogCreate" extends over multiple
cycles, and must be completed before a write operation is executed. The rising edge at input
REQ is the event that triggers an activated write operation.
Figure 3-8 Network 4
Structure and Use of the CPU Memory
Function Manual, 10/2018, A5E03461664-AC
Network 3
Memory usage and application examples
3.2 Memory usage for data logging
49