Siemens S7-1500 Function Manual page 43

Memory usage and application examples
3.1 Memory usage for recipes
Note
Asynchronous instructions
Please note that the "RecipeExport" and "RecipeImport" instructions are asynchronous
instructions.
In contrast to synchronous instructions, this means the execution of an asynchronous
instruction can extend over multiple calls before execution is completed. The CPU processes
asynchronous instructions in parallel with the cyclic user program.
A CPU can process several asynchronous instruction jobs in parallel. The CPU can process
a maximum of 10 jobs of the instructions listed in parallel.
You can find additional information about asynchronous instructions in the following
manuals:
• System manual S7-1500, ET 200MP
(http://support.automation.siemens.com/WW/view/en/59191792)
• System manual ET 200SP Distributed I/O System
(http://support.automation.siemens.com/WW/view/en/58649293)
• Operating instructions ET 200pro CPU 1516pro-2 PN
(https://support.industry.siemens.com/cs/ww/en/view/109482416)
Reference
You can find additional information on the instructions for recipes in the STEP 7 online help
under "Programming a PLC > Instructions > Instructions (S7-1200, S7-1500) > Extended
instructions > Recipes and data logging > Recipe functions".
Note also FAQ "Using recipe functions for persistent data with SIMATIC S7-1200 and
S7 1500" on the Internet (https://support.industry.siemens.com/cs/ww/en/view/109479727).
42
Structure and Use of the CPU Memory
Function Manual, 10/2018, A5E03461664-AC