Single-Channel Safety Application; Table 17: Safety Parameters For Single-Channel Safety Application - WAGO 753-668/000-004 Manual

WAGO-I/O-SYSTEM 750
753-668/000-004 4FAI 0/4-20 mA Diff PROFIsafe
3.6.7.2

Single-Channel Safety Application

Table 17: Safety Parameters for Single-Channel Safety Application

Maximum safety integrity level per IEC 62061
Maximum safety integrity level per IEC 61508
Maximum performance level per EN ISO 13849-1 Cat. 2/PL d
Proof test interval/usage duration
Probability of failure
*)
PFD ,
AVG
Proof test interval
20 years (low demand
mode) (IEC 61508)
Probability of failure
*)
PFH ,
Proof test interval
20 years (high demand
mode) (IEC 61508)
Hardware fault tolerance HFT with
single-channel application
(IEC 61508)
DC (Diagnostic
AVG
Coverage Level)
MTTF
d
(Mean Time To Failure
dangerous)
*)
PFD
AVG
PFH: Probability of a dangerous failure per hour
for 1 input
(input to fieldbus)
for 2 inputs in the same
safety function
(input to fieldbus)
for 4 inputs in the same
safety function
(input to fieldbus)
for 1 input
(input to fieldbus)
for 2 inputs in the same
safety function
(input to fieldbus)
for 4 inputs in the same
safety function
(input to fieldbus)
for 1 input
(input to fieldbus)
for 2 inputs in the
same safety function
(input to fieldbus)
for 4 inputs in the
same safety function
(input to fieldbus)
for 1 input
(input to fieldbus)
for 2 inputs in the
same safety function
(input to fieldbus)
for 4 inputs in the
same safety function
(input to fieldbus)
: Probability of a dangerous failure on demand
SIL 2
SIL 2
20 years
4,37 × 10
5,88 × 10
8,89 × 10
1,3 × 10
1,3 × 10
1,3 × 10
0
(1 error in the application can
lead to a failure of the safety
equipment)
97,75 %
97,82 %
97,94 %
698 years
631 years
530 years
Version 1.0.0, valid from HW/SW Version 01/01
Device Description
−5
−5
−5
−9
1/h
−9
1/h
−9
1/h
Manual
37