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4
Functional Safety data declaration
Product identification
FORTiS-N FS with BiSS Safety and
Siemens DRIVE-CLiQ serial interfaces
IEC 61508 safety data
Safety integrity level
Random hardware failures (per hour)
– BiSS Safety serial interface
Random hardware failures (per hour)
– Siemens DRIVE-CLiQ serial interface
PFD
avg
PFH (per hour) – BiSS Safety serial interface
PFH (per hour) – Siemens DRIVE-CLiQ serial interface
Architectural constraints
Hardware safety integrity compliance
Systematic safety integrity compliance
Systematic capability
Demand mode
Proof test interval
10
FORTiS-N Functional Safety enclosed encoder system – original instructions
2
l
=
2.60E-07
S
l
=
4.08E-07
D
l
=
3.67E-07
DD
l
=
4.08E-08
DU
l
=
3.46E-07
S
l
=
6.02E-07
D
l
=
5.42E-07
DD
l
=
6.02E-08
DU
Not applicable due to continuous
demand mode
l
=
4.08E-08
DU
l
=
6.02E-08
DU
Type
B
HFT
0
SFF
94%
Route 1H
Route 1S
SC 2
Continuous
Not required for continuous demand
mode
ISO 13849 safety data
MTTF
– BiSS Safety serial interface
D
MTTF
– Siemens DRIVE-CLiQ serial interface
D
Diagnostic coverage
Category
Performance level
Lifetime/replacement limits
The FORTiS-N FS encoder system provides safe position data that supports the following safety
sub‑functions defined by IEC 61800‑5‑2:
•
Safe stop 1 (SS1) and Safe stop 2 (SS2)
•
Safe operating stop (SOS)
1
•
Safe limited acceleration (SLA) ≤ 200 m/s
•
Safe acceleration range (SAR) ≤ 200 m/s
•
Safe limited speed (SLS) ≤ 4 m/s
•
Safe speed range (SSR) ≤ 4 m/s
•
Safely limited position (SLP)
1
•
Safely limited increment (SLI)
1
•
Safe direction (SDI)
•
Safe speed monitor (SSM) ≤ 4 m/s
1
See the safety function restrictions for the safe position figure for each FORTiS‑N FS encoder system variant.
292 years
189 years
Medium (90%)
3
d
20 years
1
2
2
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