Communication Via S7 Connections - Siemens SIMATIC S7-400H System Manual

Communication

14.5 Communication via S7 connections

14.5 Communication via S7 connections
Communication with standard systems
Fault-tolerant communication between fault-tolerant and standard systems is not supported.
The following examples illustrate the actual availability of the communicating systems.
Configuration
S7 connections are configured in STEP 7.
Programming
All communication functions are supported for S7 communication on a fault-tolerant system.
The communication SFBs are used in STEP 7 to program communication.
Note
The START and STOP communication functions act on exactly one CPU or on all CPUs of
the fault-tolerant system (for more details refer to the
System and Standard Functions
NOTICE
Downloading the connection configuration in RUN
If you download a connection configuration during operation, any established connections
could be canceled.
236
System Software for S7-300/400,
Reference Manual).
System Manual, 03/2012, A5E00267695-11
S7-400H