Siemens SIMATIC S7-1500 Function Manual page 73

Open User Communication
6.3 Instructions for Open User Communication
Additional information
The STEP 7 online help describes:
● The user and system data types
● The instructions for open communication
● The connection parameters
You will find information about the allocation and release of connection resources in the
section Allocation of connection resources (Page 311).
See also
Secure Open User Communication (Page 92)
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Function Manual, 11/2019, A5E03735815-AH
Communication