Functional Safety Data Declaration - Renishaw FORTiS-S FS Installation Manual

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Functional Safety data declaration

Functional Safety data declaration for 2, 3, 4, 5, 6, 7 and 8 readheads
IEC 61508 safety data
Product identification
Safety integrity level
Failure rate data
Random hardware failures (per hour)
– BiSS Safety serial interface
Random hardware failures (per hour)
– Siemens DRIVE-CLiQ serial interface
PFH (per hour) – BiSS Safety serial interface
PFH (per hour) – Siemens DRIVE-CLiQ serial interface
PFD
avg
Architectural constraints
Hardware safety integrity compliance
Systematic safety integrity compliance
Systematic capability
Demand mode
Proof test interval
FORTiS-S FS and FORTiS-N FS variants with BiSS Safety and Siemens DRIVE-CLiQ serial interfaces
2
2 readheads 3 readheads
l l
= 4.59E-07 = 6.88E-07
S S
l l
= 7.99E-07 = 1.20E-06
D D
l l
= 7.19E-07 = 1.08E-06
DD DD
l l
= 7.99E-08 = 1.20E-07
DU DU
l l
= 6.75E-07 = 9.94E-07
S S
l l
= 1.19E-06 = 1.73E-06
D D
l l
= 1.07E-06 = 1.56E-06
DD DD
l l
= 1.19E-07 = 1.73E-07
DU DU
l = 7.99E-08 l = 1.20E-07
DU DU
l = 1.19E-07 l = 1.73E-07
DU DU
Not applicable due to continuous demand mode
Type B
HFT 0
SFF 95%
Route 1H
Route 1S
SC2
Continuous
Not required for continuous demand mode
4 readheads 5 readheads 6 readheads
l l l
= 9.17E-07 = 1.15E-06
S S S
l l l
= 1.60E-06 = 2.00E-06
D D D
l l l
= 1.44E-06 = 1.80E-06
DD DD DD
l l l
= 1.60E-07 = 2.00E-07
DU DU DU
l l
= 1.32E-06 = 1.66E-06 Not permitted
S S
l l
= 2.31E-06 = 2.89E-06
D D
l l
= 2.08E-06 = 2.60E-06
DD DD
l l
= 2.31E-07 = 2.89E-07
DU DU
l = 1.60E-07 l = 2.00E-07 l
DU DU DU
l = 2.31E-07 l = 2.89E-07 Not permitted
DU DU
7 readheads 8 readheads
l l
= 1.38E-06 = 1.61E-06 = 1.84E-06
S S
l l
= 2.40E-06 = 2.80E-06 = 3.20E-06
D D
l l
= 2.16E-06 = 2.52E-06 = 2.88E-06
DD DD
l l
= 2.40E-07 = 2.80E-07 = 3.20E-07
DU DU
Not permitted Not permitted
= 2.40E-07 l = 2.80E-07 l = 3.20E-07
DU DU
Not permitted Not permitted
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