Media Redundancy; Interface In The User Program; Call Interface For Open Communications Services Send/Recv; Programmed Communication Connections With Ip_Config - Siemens SIMATIC NET S7-400 Manual

6.8

Media redundancy

You can use the CP in a ring topology with media redundancy. The CP itself can be
redundancy manager.
For more detailed information on configuration, refer to the online help of the "Media
redundancy" parameter group and in Part A of the manual /2/ (Page 82).
Note
If you are using IRT communication, no media redundancy is supported.
6.9

Interface in the user program

6.9.1

Call interface for open communications services SEND/RECV

Change call parameters only after job confirmation
Note
Note the following for the call interface of the program blocks AG_SEND / AG_LSEND /
AG_SSEND or AG_RECV / AG_LRECV / AG_SRECV:
Once the job has been triggered, you can only make changes again after the program block
has confirmed completion of the job with DONE=1 or with ERROR=1.
If this is ignored, it is possible that the execution of the job will be aborted with an error and
resources could be permanently occupied on the CPU.
6.9.2

Programmed communication connections with IP_CONFIG

Downloading the configuration using IP_CONFIG (FB55)
FB55 allows programcontrolled transfer of the configuration data.
Note
If the CP is in PG STOP mode and the configuration is downloaded using FB55; the CP then
changes automatically to RUN.
CP 443-1 (EX30)
Manual, 03/2019, C79000-G8976-C255-05
Configuration and operation
6.8 Media redundancy
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