Simulate Peripheral I/O - Siemens Simatic S7-1500 Function Manual

Simulate CPU

5.5 Simulate peripheral I/O

5.5 Simulate peripheral I/O
The Runtime API writes to and reads from a memory area. This memory is synchronized
with the internal process image of the virtual S7-1500 controller at the cycle control point and
when calling cyclic and acyclic OBs (process image partitions, interrupts, events). The direct
I/O accesses are made to this memory area. Only one process can access this memory at a
given time.
The virtual controller must be in RUN to apply changes made by the API.
Note
Dominance of the API when synchronizing
The API dominates when synchronizing. If the user program writes to the same address
range as the API, the changes of the API overwrite those of the virtual controller.
See also
Deviating I/O values in the STEP 7 user program (Page 356)
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S7-PLCSIM Advanced
Function Manual, 12/2017, A5E37039512-AB