Safety Integrated - Industry - Siemens

Ex. No.
11 F-I/O-module
What are fail-safe I/O-modules?
Fail-safe I/O-modules differ from standard modules mainly by
their internal two channel structure. Two integrated processors
mutually monitor and test the input and output circuits
automatically. The connected sensors and actuators are also
monitored (wire-break, discrepancy, etc.). In case of an error,
the processors turn the F-I/O-module fail-safe.
The F-CPU communicates with a distributed F-I/O-module via
the fail-safe PROFIsafe profile. The PROFIsafe profile is integrated
in the PROFIBUS and PROFINET telegrams.
How does the user access inputs and outputs?
The inputs and outputs of an F-I/O-module are accessed via
the process image of the F-CPU:
Access to F-I/O-module Process image
Inputs Outputs
In standard program read read
In the safety program read write
The following figure illustrates the relationships.
348 Functional Example No. AS-FE-I-011-V10-EN