I/O configuration variants
6.2 Fail-safe operation
CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC
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Safety-related communication with PROFIsafe profile
PROFIsafe was the first communication standard according to the IEC 61508 safety
standard that permits both standard and safety-related communication on one bus line. This
not only results in an enormous savings potential with regard to cabling and part variety, but
also the advantage of retrofit ability.
Figure 6-2 Safety-related communication
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.
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