Siemens SIMATIC PCS 7 System Manual page 53

Figure 4-3
Safety-related and standard data are transmitted with PROFIsafe over the same bus line.
Black channel means that collision-free communication via a bus system with media-
independent network components (also wireless) is possible.
PROFIsafe is an open solution for safety-related communication via standard fieldbuses.
Numerous manufacturers of safety components and end users of safety technology have
helped to develop this vendor-neutral and open standard for PROFIBUS International (PI).
The PROFIsafe profile supports safe communication for the open PROFIBUS and
PROFINET standard buses. An IE/PB Link ensures integrated, safety-related communication
between PROFIBUS DP and PROFINET IO.
PROFIsafe is is certified to IEC 61784-3 and meets the highest requirements for the
manufacturing and process industry.
PROFIBUS is the global standard for fieldbuses with approximately 13 million installed
nodes. Its market acceptance is so high because a large number of manufacturers offer
many products for PROFIBUS. With the PA transmission variant (IEC 1158-2), PROFIBUS
extends the unified system concept of distributed automation to the process world.
PROFINET IO is the innovative and open Industrial Ethernet standard for automation. It
enables fast reaction times and transmission of large data quantities.
PROFIsafe uses the PROFIBUS or PROFINET IO services for safe communication. A fail-
safe CPU 410 and the fail-safe I/O exchange both user data as well as status and control
information; no additional hardware is required for this.
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 09/2014, A5E32631667-AB
Safety-related communication
I/O configuration variants
4.2 Fail-safe operation
53