Versions Of I/O Connection To The Profinet Io Interface; Use Of I/O Connected To The Profinet Io Interface, System Redundancy - Siemens SIMATIC CPU 410 System Manual

Changeover of the active channel during link-up and updating
During link-up and updating with master/standby changeover (see Link-up sequence
(Page 346)), a changeover between the active and passive channels occurs for all stations
of the switched I/O. At the same time OB 72 is called.
Bumpless changeover of the active channel
To prevent the I/O failing temporarily or outputting substitute values during the changeover
between the active and passive channel, the DP or PNIO stations of the switched I/O put
their outputs on hold until the changeover is completed and the new active channel has
taken over.
To ensure that total failure of a DP or PNIO station is also detected during the changeover,
the changeover is monitored by both the various DP/PNIO stations and by the DP master
system or IO system.
System configuration and project engineering
You should allocate switched I/O with different changeover times to separate chains. This,
for example, simplifies the calculation of monitoring times.
See also
Time monitoring (Page 120)
6.6

Versions of I/O connection to the PROFINET IO interface

6.6.1

Use of I/O connected to the PROFINET IO interface, system redundancy

System redundancy
You can configure the PROFINET IO system redundancy with switched devices connected
to an IM. The configuring of the PROFINET I/O is comparable to the configuring of the
PROFIBUS I/O.
You can connect a maximum of 256 IO devices to each of the two integrated PN/IO
interfaces. You can configure these as one-sided or switched devices as desired. The station
numbers are disjoint across both PN/IO interfaces and are between 1 and 256.
Note
The PROFINET IO device must support this function in order to be operated redundantly on
the fault-tolerant system. Two ports does not mean that two system connections can be
created, thereby achieving system redundancy.
CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC
6.6 Versions of I/O connection to the PROFINET IO interface
I/O configuration variants
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