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Applications of the F-I/O module
6.1 Applications cases of the I/O module
Conditions for achieving SIL/Cat./PL
The table below lists the conditions which have to be met for achieving at least the
corresponding safety requirements.
Application
Achievable safety class
The achievable safety class depends on the sensor quality and the proof-test interval according
to the standard IEC 61508:2010. If the sensor quality is not as high as required by the required
safety class, the sensor must be used redundantly, have a 2-channel connection and 2-channel
evaluation.
(FAIW-003)
Note
You can operate the different inputs of an F-I/O module simultaneously in SIL3/Cat.3/PLd and in
SIL3/Cat.4/PLe. You only have to interconnect the inputs and assign parameters as described in
the following sections.
Sensor requirements
You can find information on the requirements placed on sensors for F-I/O modules in safety-
related use in section "Requirements placed on sensors for fail-safe modules (Page 57)".
38
Sensor evaluation
1
1a
2
2a
3
1oo2 (2v2)
(not on the module, only in the F-
program)
3a
1oo2 (2v2)
(not on the module, only in the F-
program)
4
(not on the module, only in the F-
program)
WARNING
1oo1
Internal, since 2-wire transmit‐
ter
1oo1
Internal, since 2-wire transmit‐
ter
1oo1
External, since 4-wire transmit‐
ter
1oo1
External, since 4-wire transmit‐
ter
•
Internal, if 2-wire transmit‐
ter
•
External, if 4-wire transmit‐
ter
•
Internal, if 2-wire transmit‐
ter
•
External, if 4-wire transmit‐
ter
2oo3
•
Internal, if 2-wire transmit‐
ter
•
External, if 4-wire transmit‐
ter
Sensor supply
F-AI 8xI 2-/4-wire HART HA
Equipment Manual, 09/2021, A5E50557845-AA
Achievable
SIL/Cat./PL
3 / 3 / d
3 / 4 / e
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