Siemens SIMATIC S7-1500 Function Manual page 118

6. In the Project tree, select the "Program blocks" folder for one of the CPUs and open OB1
in the folder by double-clicking on it. The program editor opens.
7. In the program editor, call the relevant instructions for S7 communication in the user
program of the communication partner (configured at one end) or in the user programs of
the communication partners (configured at both ends). Select the BSEND and BRCV
instructions from the "Communication" area of the "Instructions" task card, for example,
and drag them to a network of OB1.
8. At the ID parameter of the instruction, assign the local ID of the configured connection to
be used for the transmission of data.
9. Assign the parameters for the instructions indicating which data will be written to where
and which data will be read from where.
10. Download the hardware configuration and user program to the CPU(s).
S7 communication via CP 1543-1
If you set up S7 communication via the Industrial Ethernet interface of the CP 1543-1, you
can select the transport protocol for data transfer in the properties of the S7 connection
under "General":
● "TCP/IP" check box selected (default): ISO-on-TCP (RFC 1006): for S7 communication
between S7-1500 CPUs
● "TCP/IP" check box cleared: ISO protocol (ISO/IEC 8073): Addressing using MAC
addresses
Figure 7-3 Selecting the CP 1543-1 transport protocol
Communication
Function Manual, 11/2019, A5E03735815-AH
S7 communication
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