Siemens SIMATIC CPU 410 User Manual

I/O configuration variants
6.6 Versions of I/O connection to the PROFINET IO interface
CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC
73
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.

Siemens SIMATIC CPU 410 Specifications

General

Brand	Siemens
Model	SIMATIC CPU 410
Category	Control Unit
Language	English