Media Redundancy; Interface In The User Program; Call Interface For Open Communications Services Send/Recv - Siemens SIMATIC NET CP 443-1 Advanced Manual

Remedy
The IO device being used as a shared device will only take part in data exchange if the
higher-level I/O controllers are configured identically in terms of using routers.
You should therefore configure the PROFINET interfaces on the other IO controllers as
follows:
● The IP address of the PROFINET interface of the CP is used as the router address.
or
● The CP being used as the IO controller and all other IO controllers use the same IP
address as the router address.
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 118).
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.
CP 443-1 Advanced (GX30)
Manual, 03/2019, C79000-G8976-C256-05
Configuration and operation
6.8 Media redundancy
77