Siemens S7-300 - 4 SEND;RECEIVE Interface in the User Program; How the SEND;RECEIVE Interface Works on the CPU

Configuring and commissioning S7 CPs for Industrial Ethernet
Configuration Manual, 09/2013, C79000-G8976-C182-13
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SEND/RECEIVE interface in the user program
4
This section explains the following topics:
● How is data sent and received for the open communication services?
● Which data areas can be used on the S7 CPU?
● How do you program the SEND/RECEIVE interface in the user program?
There, you will find further information:
● The program blocks for programming the connections are described in /10/ (Page 230).
Configuration and program examples are available for the SEND/RECEIVE interface
described here:
● Program examples with the program blocks FC5 (AG_SEND) and FC6 (AG_RECV) for
S7-300 can be found under the following entry ID:
17853532 (http://support.automation.siemens.com/WW/view/en/17853532)
● Program examples with the program blocks FC50 (AG_LSEND) and FC60 (AG_LRECV)
for S7-400 can be found under the following entry ID:
18513371 (http://support.automation.siemens.com/WW/view/en/18513371)
There, you will also find a collection of further entries as well as project and programming
examples for S7 CPs for Industrial Ethernet.
● You will find sample programs and configurations in the Quick Start Collection on the
Internet under the following entry ID:
21827955 (http://support.automation.siemens.com/WW/view/en/21827955)
4.1
How the SEND/RECEIVE interface works on the CPU
Program blocks
To handle communication via connections, the following program blocks of the type FC are
available:
● AG_SEND (FC 5) / AG_LSEND (FC 50) / AG_SSEND (FC 53)
The program block transfers the user data from the specified user data area for transfer
to the Ethernet CP.
● AG_RECV (FC 6) / AG_LRECV (FC 60) / AG_SRECV (FC 63)
The program block enters the received user data in the user data area specified in the
call.