安规网

标题: DSH 295 Object [打印本页]
作者: 小米    时间: 2012-9-19 15:18
标题: DSH 295 Object

5 D( i/ M# x+ E# p6 ?5 g! T
+ H) H) n) h3 ^$ C% m
DSH 295' [9 `, @7 o3 ^  F! @
Object* L) |6 h" O' U7 W, `
1.2
- O; F1 {, f% r+ E) v
61010-1(ed.1);am1;am2/ Y- n* t# O# j( J3 ^
+ U* b. a, _/ }2 ?0 f# Q% f
5 o) y7 F' Q7 u& d" N" a0 {
Standard:% ?# a6 V2 o. K& h
IEC 61010-1:1990
2 Y' _6 @- i' f( \; i8 m+A1:1992+A2:1995
4 E. L0 B: p" M, M' p! g. TSub clause:
; X2 {- i$ V2 ^& U1.2
# z5 M, p. |' l+ j" Z" l. fSheet n. 295
1 B8 Q0 P0 B; m' \& h$ ePage 1(1)
. j1 b6 G6 p+ @% _/ k- i8 }( qSubject:
+ [' g6 I) B- S: S5 ^5 ^Object
$ R7 Z: G5 O3 [" uKey words:
! A3 d- G& s$ J. A3 D: }: b3 {1 e- Scope3 j" L4 {& u) Y4 q9 L
- Software Safety
* r, X- }6 P1 [! a, Q7 N5 vDecision taken by
- L0 r4 n+ a& z$ G/ F* h2 e; nETF3 and confirmed
% h6 m5 G) k( x1 v+ t4 S1 A7 |* @by CTL at its 38th
2 y- z) d( o+ H9 x, @/ ]/ B! nmeeting, in Toronto4 t8 R) e% z) g5 Z
Question:
- f, r3 q3 Z2 tIf safety is dependent on Software, what criteria do laboratories employ to ensure
0 o$ c4 ^1 B" O2 t8 A( q# kcompliance?6 N% T9 p' T5 F# u  z* m5 t/ b
Decision:
* a4 H( M3 D. xSoftware safety is not specifically addressed in IEC 61010-1 at present and therefore, there
; t1 h2 N/ A$ lare no specific guidelines for this work. A draft collateral standard is in preparation and also
' {0 ~) ?  f% {2 \. t3 M5 N  t# p2 `IEC 61508 deals with this topic./ l% G+ D4 i5 g2 f& V
Generally, it is advised that devices should not be dependent on software alone for their; x+ ^* P1 X. I) W+ m
safety. There should be a separate independent means provided which acts to prevent a4 s# _9 \+ _/ V1 [$ a7 p
dangerous condition arising.
: g/ b! m& w0 R7 yExplanation:- K- ^5 k- }+ @3 W1 E- |3 C
Experience shows that the analysis of software systems to ensure their safe operation is very. d  S2 _3 P0 r( {) H
difficult and in practice, can only provide a measure of confidence. Additionally, the
. s* b$ Q; J" {# Z, S. C# tmethods of performing the examination are not widely agreed upon and therefore, subject to* D# b4 x! g+ N3 ?/ c
doubt. In these circumstances, it is preferred to adopt safety limit methods known from
7 P. c, z' O, H6 k0 zexperience to be effective.
; p* ^1 C% X6 t1 s  q# a3 L+ I5 v3 I: m- ~; }
[attach]76254[/attach]
- T; d) _" P/ D* l5 _9 c+ Q+ w7 I9 c: |5 U3 i& a" g( C




欢迎光临 安规网 (http://bbs.angui.org/) Powered by Discuz! X3.2