Safety Parameters; Two-Channel Safety Application; Table 16: Safety Parameters For Two-Channel Safety Application - WAGO 753-668/000-004 Manual

36 Device Description
3.6.7

Safety Parameters

3.6.7.1

Two-Channel Safety Application

Table 16: Safety Parameters for Two-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
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 two-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
Manual
Version 1.0.0, valid from HW/SW Version 01/01
753-668/000-004 4FAI 0/4-20 mA Diff PROFIsafe
for 1 input pair
(input to fieldbus)
for 2 input pairs in the
same safety function
(input to fieldbus)
for 1 input pair
(input to fieldbus)
for 2 input pairs in the
same safety function
(input to fieldbus)
for 1 input pair
(input to fieldbus)
for 2 input pairs in the
same safety function
(input to fieldbus)
for 1 input pair
(input to fieldbus)
for 2 input pairs in the
same safety function
(input to fieldbus)
: Probability of a dangerous failure on demand
WAGO-I/O-SYSTEM 750
SIL 3
SIL 3
Cat. 4/PL e
20 years
−5
2,45 × 10
−5
2,48 × 10
−10
5 × 10 1/h
−10
5 × 10 1/h
1
(1 error in the application does
not yet lead to a failure of the
safety equipment)
97,84 %
97,96 %
698 years
631 years