ISO 13849-1:2015(E)
Foreword ..........................................................................................................................................................................................................................................v
Introduction
................................................................................................................................................................................................................................ vi
1 Scope
................................................................................................................................................................................................................................. 1
2 Normative references
...................................................................................................................................................................................... 1
....................................................................................................... 2
....................................................................................................................................................................... 2
............................................................................................................................................... 7
4 Design considerations
.................................................................................................................................................................................... 9
............................................................................................................................................................ 9
......................................................................................................................................................... 11
4.2.1 General................................................................................................................................................................................... 11
......................................................... 11
4.3 Determination of required performance level (PL
r
) ........................................................................................... 13
4.4 Design of SRP/CS
................................................................................................................................................................................ 14
4.5 Evaluation of the achieved performance level PL and relationship with SIL
................................. 15
4.5.1 Performance level PL ................................................................................................................................................15
4.5.2 Mean time to dangerous failure of each channel (MTTF
D
) ...................................................... 16
4.5.3 Diagnostic coverage (DC) ...................................................................................................................................... 17
................................ 17
....................................................... 19
................................................................................................................................................. 20
4.6.1 General................................................................................................................................................................................... 20
.......................................................................................21
.....................................................................................22
4.6.4 Software-based parameterization ................................................................................................................. 24
r
..........................................................................................................................
25
4.8 Ergonomic aspects of design ................................................................................................................................................... 26
5 Safety functions
..................................................................................................................................................................................................26
...........................................................................................................................................26
..........................................................................................................................................................28
................................................................................................................................ 28
5.2.2 Manual reset function ...............................................................................................................................................29
5.2.3 Start/restart function ............................................................................................................................................... 29
5.2.4 Local control function...............................................................................................................................................30
5.2.5 Muting function .............................................................................................................................................................. 30
5.2.6 Response time ................................................................................................................................................................. 30
................................................................................................................................... 30
5.2.8 Fluctuations, loss and restoration of power sources .....................................................................30
6 Categories and their relation to MTTF
D
of each channel, DC
avg
and CCF ................................................31
6.1 General ........................................................................................................................................................................................................ 31
.......................................................................................................................................................31
6.2.1 General................................................................................................................................................................................... 31
6.2.2 Designated architectures ....................................................................................................................................... 32
...........................................................................................................................................................................32
........................................................................................................................................................................... 33
........................................................................................................................................................................... 34
........................................................................................................................................................................... 35
........................................................................................................................................................................... 36
6.3 Combination of SRP/CS to achieve overall PL ...........................................................................................................38
7 Fault consideration, fault exclusion
...............................................................................................................................................40
7.1 General ........................................................................................................................................................................................................ 40
7.2 Fault consideration ........................................................................................................................................................................... 40
© ISO 2015 – All rights reserved iii
Contents Page
Copyrighted material licensed to SGS SA. No further reproduction or distribution permitted.
Printed / viewed by: [scarlett_si@sgs.com] @ 2016-02-01
评论0