Siemens SIMATIC S7-400H - Page 451

Stand-alone operation
S7-400H
System Manual, 03/2012, A5E00267695-11
451
System modification during operation in stand-alone mode
With a system modification during operation, it is also possible to make certain configuration
changes in RUN on fault-tolerant CPUs. The procedure corresponds to that for standard
CPUs. Processing is halted during this, but for no more than 2.5 seconds (parameterizable).
During this time, the process outputs retain their current values. In process control systems
in particular, this has virtually no effect on the process. See also the
"Modifying the System
during Operation via CiR"
manual.
System modifications during operation are only supported with distributed I/O. They require a
configuration as shown in the figure below. To give you a clear overview, this shows only
one DP master system and one PA master system.
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Figure B-1 Overview: System structure for system modifications during operation