The tasks whic the s stem ne d to p rform s ould b defined in terms of the selected BCS, its s stem pro erties, an the req ired fu ction.. The as es ment program s al b desig ed with the
Trang 1Industrial-process measurement, control and automation – Evaluation of sy stem
properties for the purpose of sy stem assessment –
Part 2: Assessment methodology
des propriétés d'un sy stème en vue de son évaluation –
Partie 2: Méthodologie à appl quer pour l'évaluation
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Trang 3Industrial-process measurement, control and automation – Evaluation of sy stem
properties for the purpose of sy stem assessment –
Part 2: Assessment methodology
des propriétés d'un sy stème en vue de son évaluation –
Partie 2: Méthodologie à appl quer pour l'évaluation
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Trang 4CONTENTS
FOREWORD 4
INTRODUCTION 6
1 Sco e 8
2 Normative referen es 8
3 Terms, definition , a breviated terms, acron ms, con ention an s mb ls 8
3.1 Terms an definition 8
3.2 Ab reviated terms, acron ms, con ention an s mb ls 8
4 As es ment a pro c 8
5 As es ment method 9
5.1 Overview 9
5.1.1 General 9
5.1.2 Phases 9
5.2 Definin the o jectives of the as es ment 10 5.3 Desig an layout of the as es me t 1
5.3.1 Definin the s o e of as es ment 1
5.3.2 Sy tem pro erties an influen in factors 1
5.3.3 Col ation of doc mented information 13 5.3.4 Doc mentin col ated information 14 5.3.5 Selectin as es ment items 14 5.3.6 As es ment sp cification 14 5.4 Plan in of the as es me t pro ram 14 5.4.1 Overview 14 5.4.2 Develo in as es ment activities 15 5.4.3 As es ment program 16 5.5 Ex c tio of the as es me t 16 5.6 Re ortin of the as es ment 16 6 Evaluation tec niq es 17 An ex A (informative) Sy tem Req irements Doc ment (SRD) 18 A.1 Overview 18 A.2 Analy is of s stem mis ion 18 A.2.1 General 18 A.2.2 Formulation of s stem mis ion 18 A.2.3 Analysis of system mis io into tasks 18 A.2.4 As ig ment of relativ imp rtan e to tasks 19 A.2.5 Definin influe cing factors 19 A.3 Review of s stem req irements doc ment (SRD) 19 An ex B (informative) Sy tem Sp cification Doc ment (SSD) 20 B.1 Overview 2
B.2 Dev lopment of system spe ification d c ment 2
B.2.1 Ge eral 2
B.2.2 System ov rview 2
B.2.3 Definin system bo n aries 21 B.2.4 Spe ification of system 21
B.2.5 Description of system op ratio 21
Trang 5B.2.7 Stateme t of c mpl an e with system req ireme ts 22
An ex C (informative) Examples of col ation doc mentation 2
C.1 Overview 2
C.2 Example of furnace control doc mentation 2
C.2.1 Sc ematic of task 2
C.2.2 Task definition 2
C.2.3 Input c aracteristic 2
C.2.4 Output c aracteristic 2
C.2.5 Op rational fu ction 2
C.2.6 Monitorin fu ction 2
C.2.7 Config ration 2
C.2.8 Flexibi ty 2
C.2.9 Fu ctional ty colation ta les 2
C.3 Example of simple control lo p task doc mentation 3
C.3.1 Overview 3
C.3.2 Sc ematic of task 3
C.3.3 Information flows 3
C.3.4 Performan e ta les 3
C.3.5 Performan e col ation ta les 3
C.4 Example of colation doc mentation ( rom SRD of a master-slave control task) 3
C.4.1 Overview 3
C.4.2 Sc ematic of task 3
C.4.3 Bou dary states 35 C.5 Example of colation doc mentation ( rom SSD of a master-slave control task) 3
Bibl ogra h 3
Fig re 1 – General layout of IEC 610 9 7
Fig re 2 – As es ment matrix 12 Fig re C.1 – Control block 2
Fig re C.2 – Task s hematic 3
Fig re C.3 – Sc ematic of task 35 Ta le 1 – As es ment phases, inputs an outputs 10 Ta le C.1 – SRD coverage analy is 2
Ta le C.2 – SRD config ra i ty analy is 2
Ta le C.3 – SRD flexibi ty analy is 30 Ta le C.4 – Performan e for information flow 3
Ta le C.5 – Information tran lation 3
Ta le C.6 – Performan e col ation 3
Ta le C.7 – Fai ure states of task input an output 3
Ta le C.8 – De en a i ty 3
Trang 6INTERNATIONAL ELECTROTECHNICAL COMMISSION
Part 2: Assessment methodology
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in th su je t d alt with ma p rticip te in this pre aratory work Intern tio al g v rnme tal a d n
n-g v rnme tal org nizatio s laisin with th IEC also p rticip te in this pre aratio IEC c la orates closely
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a re me t b twe n th two org nizatio s
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International Stan ard IEC 610 9-2 has b en pre ared by s bcommite 6 A: Sy tem
asp cts, of IEC tec nical commite 6 : In u trial-proces me s rement, control an
automation
This secon edition can els an re laces the first edition publ s ed in 19 3 This edition
con titutes a tec nical revision
This edition in lu es the fol owin sig ificant tec nical c an es with resp ct to the previou
edition:
a) Re rganization of the material of IEC 610 9-2:19 3 to ma e the overal set of stan ard
more organized an con istent;
Trang 7The text of this stan ard is b sed on the fol owin doc ments:
Ful information on the votin for the a proval of this stan ard can b fou d in the re ort on
votin in icated in the a ove ta le
This publcation has b en drafed in ac ordan e with the ISO/IEC Directives, Part 2
A l st of al p rts in the IEC 610 9 series, publ s ed u der the general title Industrialp roces
me sureme nt,co trol a d au tomato – Ev luato of system prop ertes for th p u rp ose of
system as es me t, can b fou d on the IEC we site
The commit e has decided that the contents of this publ cation wi remain u c an ed u ti
the sta i ty date in icated on the IEC we site u der "htp:/ we store.iec.c " in the data
related to the sp cific publ cation At this date, the publ cation wi b
• reconfirmed,
• with rawn,
• re laced by a revised edition, or
• amen ed
IMPORTANT – Th 'colour in ide' logo on the cov r pa e of this publ c tion indic te
that it contains colours whic are consid re to be us ful for the cor e t
understa ding of its conte ts Us rs s ould therefore print this doc me t usin a
colour printer
Trang 8INTRODUCTION
IEC 610 9 de ls with the method whic s ould b u ed to as es s stem pro erties of a
b sic control s stem (BCS) IEC 610 9 con ists of the folowin p rts:
Part 1: Terminolog an b sic con e ts
Part 2: As es ment methodolog
Part 3: As es ment of s stem fu ctional ty
Part 4: As es ment of s stem p rforman e
Part 5: As es ment of s stem de en a i ty
Part 6: As es ment of s stem o era i ty
Part 7: As es ment of s stem safety
Part 8: As es ment of other s stem pro erties
As es ment of a s stem is the ju gement, b sed on eviden e, of the s ita i ty of the s stem
for a sp cific mis ion or clas of mis ion
To o tain total eviden e would req ire complete evaluation ( or example u der al influen in
factors) of al s stem pro erties relevant to the p rtic lar mis ion or clas of mis ion
Sin e this is rarely practical, the rationale on whic an as es ment of a s stem s ould b
b sed is:
– the identification of the imp rtan e of e c of the relevant s stem pro erties;
– the plan in for evaluation of the relevant s stem pro erties with a cost ef ective
dedication of ef ort to the variou s stem pro erties
In con u tin an as es ment of a s stem, it is cru ial to b ar in min the ne d to gain a
maximum in re se in confiden e in the s ita i ty of a s stem within practical cost an time
con traints
An as es ment can only b car ied out if a mis ion has b en stated (or given), or if an
mis ion can b h p thesized In the a sen e of a mis ion, no as es ment can b made;
however, evaluation can sti b sp cified an car ied out for u e in as es ments p rformed
by others In s c cases, the stan ard can b u ed as a g ide for plan in an evaluation an
it provides method for p rformin evaluation , sin e evaluation are an integral p rt of
as es ment
In pre arin the as es ment, it may b dis overed that the definition of the s stem is to
nar ow For example, a faci ty with two or more revision of the control s stems s arin
resources, e.g a network, s ould con ider is ues of co-existen e an inter-o era i ty In this
case, the s stem to b in estigated s ould not b l mited to the “new” BCS; it s ould in lu e
b th That is, it s ould c an e the b u daries of the s stem to in lu e enou h of the other
s stem to ad res these con ern
The p rt stru ture an the relation hip amon the p rts of IEC 610 9 are s own in Fig re 1
Trang 9Figure 1 – Ge eral la out of IEC 610 9
IEC
Part 1: T rmin logy an bas ic co ce t s
Part 2: As es me t met ho ology
Part s 3 t o 8: As ses sme t of each sy st em pro ert y
• Ge eric re uireme t of proce ure of as es me t
‐ Overview, ap roa h an p ases
‐ Re uireme t s for ea h p ase
‐ Ge eral d scrip o of ev luatio tech iq es
• Basics of as es me t sp cific to ea h pro ery
‐ Pro eries an in u ncin factor
• As es me t meth d for ea h pro ery
• Ev luatio t ech iq esfor ea h pro ery
IEC 6 0 9: Indust ial-proces measurement , cont oland automation –
Evaluation of systemproper ies f or the purpose of systemas es ment
Trang 10INDUSTRIAL-PROCESS MEASUREMENT, CONTROL AND AUTOMATION –
It des rib s the method for analy in , weig in the relative imp rtan e of the variou s stem
pro erties an influen in factors, an determinin an as es ment program
The folowin doc ments, in whole or in p rt, are normatively referen ed in this doc ment an
are in isp n a le for its a pl cation For dated referen es, only the edition cited a pl es For
u dated referen es, the latest edition of the referen ed doc ment (in lu in an
amen ments) a pl es
IEC 610 9-1:—
1
, Industrialp roces me sureme nt, co trol a d au tomato – Ev lu ato of
system p rop erte s for th purp ose of system as es me t – Part 1: Te rmin logy a d b asic
co ce pts
3 Terms, definitions, abbreviated terms, acronyms, conventions and s mbols
3.1 Terms a d definitions
For the purp ses of this doc ment, the terms an definition given in IEC 610 9-1 a ply
3.2 Abbre iate terms, a ron ms, conv ntions a d s mbols
For the purp ses of this doc ment, the a breviated terms, acron ms, con ention an
s mb ls given in IEC 610 9-1 a ply
BCSs are s f iciently complex, so that a total y comprehen ive as es ment inevita ly req ires
an exp n iture of ef ort an time that is neither practical nor cost ef ective It is therefore
imp rtant to analy e an sp cify the o jectives of the as es ment carefuly, b fore an
as es ment program is plan ed
The mis ion of the s stem or clas of mis ion is bro en down into tasks
The task(s) whic the s stem ne d to p rform s ould b defined in terms of the selected
BCS, its s stem pro erties, an the req ired fu ction This ena les the fu ction req ired for
the s stem to fulfi its mis ion(s) to b sp cified precisely
Trang 11Mis ion of the s stem u ual y req ire some c aracteristic of the s stem whic are not
directly related to the tasks of the s stem Su h c aracteristic in lu e doc mentation an
s p ort services
The as es ment program s al b desig ed with the as es ment o jectives, the s stem
req irements an the s stem sp cification It s ould b pre ared in ad an e
NOT In c rtain c ses, e.g a re ulate a plc tio , it ma b n c s ary th t th as es me t b d sig e a d
p rforme b a in e e d nt p rty
In the a sen e of a mis ion, no as es ment can b made; however, examination of the
s stem to gather an organize data for a later as es ment is p s ible
5.1.1 Ge eral
The detais of the as es ment program s al b derived from con ideration of the as es ment
o jectives (as stated in 5.2) an the folowin inputs:
– Sy tem Req irements Doc ment (SRD), an
– Sy tem Sp cification Doc ment (SSD)
NOT 1 Systems Re uireme ts Do ume t is e plain d in An e A
NOT 2 System Sp cific tio Do ume t is e plain din An e B
The as es ment cor elates items of the s stem req irements doc ment with the s stem
sp cification doc ment g ided by the as es ment o jective
If at an phase of the as es ment information from the SRD or SSD is mis in or in omplete,
the originators of the SRD or SSD s ould b con ulted with sp cific q estion to o tain the
req ired further information
The as es ment method is a to l to b uti zed d rin the lfe c cle of BCS Yet the l fe c cle
Trang 12Table 1 – As e sme t pha e , inputs a d outputs
Ex c tio of th a s s ment As es me t pro ram Result of th e alu tio s
Rep r ing of th re ults Result of th e alu tio s Re ort of th as es me t
5.2 Defining th obje tiv s of the as e sme t
The o jectives of the as es ment s al b stated an doc mented prior to the start of the
as es ment as a fou dation for plan in an pre aration of the as es ment program They
s ould b stated cle rly an careful y
These o jectives form the b sis of the g idin prin iples throu hout the as es ment by:
• determinin the s o e,
• the nature of the evaluation,
• the de th of th evaluation to b car ied out,
• the me s rements an o servation to b made,
• the typ of re orts to b prod ced
The o jectives govern the cost of the as es ment an the resources req ired to con u t the
as es ment
It is therefore of utmost imp rtan e that the o jectives an the s o e of the as es ment are
wel -doc mented an agre d up n b fore the as es ment program is further develo ed
Des ription of the mag itu e of BCS c an e req irin a re s es ment s ould b defined, e.g
BCS exp n ion
Updates of the as es ment, d rin the BCS lfe c cle, regardles of c an es/exp n ion,
s ould b defined/s hed led, e.g af er 10 ye rs of o eration
The authority(ies) who may req ire an as es ment or re-as es ment s ould b defined
Ad itional y the authority(ies) who a prove as es ments or re-as es ments s ould b defined
Durin the as es ment, reviews s ould b car ied out at plan ed review p ints or at
pre-determined intervals Su h reviews s ould at le st b held at the en of e c phase
The o jectives of the as es ment may b , for example:
– to as es a sp cific s stem for a p rtic lar mis ion;
– to as es a variety of config ration of a sin le s stem for a p rtic lar mis ion;
– to comp re several s stems for a p rtic lar mis ion;
Trang 13– to esta l s the s ita i ty of a s stem for a p rtic lar mis ion;
– to esta l s the s ita i ty of a s stem for a defined clas of mis ion
The as es ment protocol s al b defined in lu in :
– the as es ment authorities for c an e an rele se of the as es ment program,
– the as es ment sp cification an the as es ment re orts,
– the proced res to b fol owed,
– the contin en y action that are p rmis ible without se kin prior authorization in the
event that the as es ment can ot b con u ted as plan ed
The b u dary of the s stem to b as es ed s al b defined by ta in into ac ou t al asp cts
of influen in factors des rib d in IEC 610 9-1; — ,5.3 It s al b doc mented in the
as es ment sp cification
The s stem b u dary can b ph sical (e.g eq ipment, ge gra h ) an /or virtual (e.g
information, commu ication)
The o jectives of the as es ment are tran lated into a s o e of the as es ment In order to
develo the s o e, the s stem pro erties des rib d in IEC 610 9-1; —, 5.2.2 to 5.2.7 s al b
ta en into con ideration
5.3.1.2 Sy tem configuration
The config ration(s) of the s stem to b as es ed s al b sp cified in the as es ment
sp cification Sin e the config ra i ty of the s stem itself can b a s stem pro erty to b
as es ed, the config ration of the s stem where the as es ment items are evaluated s ould
b careful y sp cified
If the as es ment o jective is to as es a sp cific s stem for a p rtic lar mis io , the
as es ment s al b car ied out on a sp cific s stem config ration an this config ration
s al b doc mented in the as es me t sp cificatio
If the as es ment o jective is to as es the flexibi ty of a s stem to me t a bro d ran e of
typical req irements en ou tered in a sp cific sector of in u try, the as es ment s al b
car ied out on a ran e of defined mod les that can b config red in a variety of alternative
way The ran e of mod les an the variety of config ration s al b doc mented in the
as es ment sp cification
A s stem is sometimes so complex that comprehen ive evaluation of al s stem pro erties
would not b cost efective, or even fe sible By careful con ideration of the o jectives, the
s stem config ration an the influen in factors, the evaluation can b red ced to in lu e
only those as es ment items whic are most sen itive for the mis ion of the s stem
5.3.2 Sy tem propertie a d influe cing fa tors
The as es ment items req ired for the as es ment s al b sp cified The req ired value or
Trang 14Ad itional y, as far as a pl ca le, influen in factors as des rib d in IEC 610 9-1 s ould b
in lu ed
Eac as es ment item s ould b s rutinized to determine whether it influen es or degrades
the s stem in s c a way that it hamp rs or prohibits the cor ect con u t of other as es ment
items
These con ideration s al b doc mented as an as es ment sp cification to s ow the
con traints up n the seq en in of the as es ment activities
A con enient way to doc ment the s stem pro erties an the influen in factors is in the form
of a matrix, where the cels cor esp n to the as es ment items
A generic matrix to s mmarize an as es ment is given in Fig re 2
Figure 2 – As e sme t matrix
The as es ment items req ired to b in lu ed in the as es ment s al b selected an their
relative priorities s al b determined It can b done u in this matrix as a me n for
con iderin e c s stem pro erty an e c influen in factor an ta in into con ideration
the o jective of the as es ment
An as es ment item can b progres ively further detai ed by u in e.g groups or s b-groups
of pro erties, in whic the he din s of the generic matrix are further exp n ed into more
detai ed s stem pro erties an influen in factors
As es ment items, not relevant for the p rtic lar as es ment, s ould also b identified for
later referen e, an the re son for the ex lu ion s ould be doc mented
Trang 155.3.3 Col ation of doc me te information
The col ation is a ste of this phase to extract the information whic is req ired to determine
p tential can idates of the as es ment items The information provided by this proces is
u ed for desig an layout of the as es ment
For the purp se of the col ation, the neces ary information s al b extracted from the SRD
an the SSD
The SRD an SSD s al b careful y s rutinized to compi e precise an con ise statements of
the to ic Example to ic in lu e:
– the b u daries of the s stem,
– the are s of non-compl an e b twe n s stem req irements an s stem sp cification,
– the l st of req ired an future tasks,
– the l st of fu ction provided to p rform e c of the req ired an future tasks,
– the l st of alternative data p th l nkin the fu ction to s p ort the req ired task(s),
– the al ocation of the fu ction to the mod les an elements,
– the n mb r of these mod les an elements,
– the extent to whic these mod les an elements are u ed to fulfi the req ired tasks,
– the s stem pro erties for e c of the a ove fu ction ,
– the influen in factors for e c of the a ove mod les/elements
A l st of p tential as es ment items s al b cre ted from these to ic The as es ment items
s al b sp cified u der sp cific s stem config ration(s) ac ordin to the o jective of the
as es ment
Eac p tential as es ment item s al b examined to decide the extent to whic this item is
evaluated to o tain the req ired in re se in the level of confiden e
The statements s ould b des rib d in q al tative an q antitative terms, an , if a pl ca le,
their ran e of values
NOT Ex mples of c latio d c me tatio are pro id d in An e C
Eac task to b as es ed s ould b des rib d in terms of its inputs, outputs an o eration
For e c input, notes s ould b made of:
– p rmis ible input states an c r esp ndin permis ible output state(s);
For e c of the tasks, the folowin information a out tasks s ould b cle rly stated:
– kin s of fai ures whic af ect e c task;
– p rmis ible freq en y of o c r e c of ea h fai ure;
– action to b tak n for eac fai ure;
– maximum time d rin whic the task can b sto p d b fore the mod le is restored
Trang 165.3.4 Doc me ting col ate information
The information col ated as stated in 5.3.3 s ould b doc mented in a form that can b
manipulated for the proces of plan in the as es ment program
If information for the col ation is mis in or in omplete, the req ired further information s ould
b o tained from the originators of the SRD an SSD This further or ad itional information
s ould b pro erly recorded in the as es ment sp cification
5.3.5 Sele tin a s s me t items
The complete l st of as es ment items is red ced by con iderin the fol owin fi ters:
– imp rtan e of the task(s) to the mis ion;
– existin level of confiden e b sed up n prior knowled e;
– the level of interde en en y of dif erent fu ction , the n mb r of interfaces, the re-u e of
the same fu ction in diferent tasks;
– the glo al pre-knowled e avai a le an extent to whic the knowled e a pl es to the
as es ment item(s)
The relative imp rtan e s ould b evaluated ta in into ac ou t b th asp cts of imp rtan e
of the task(s) in a p rtic lar phase of the s stem l fe time an of d ration of the phase sin e
imp rtan e can vary de en in of the phase
The existin level of confiden e may b b sed on precedin s c es of the s stem in simi ar
or identical mis ion , exp rien e with the man facturer, the exp rien e of u ers with the
same s stem typ or comp ra le s stems
As es ment items whic are req ired by international an /or national reg latory b dies s al
b evaluated in ac ordan e with the rules laid down in those reg lation
As es ment items s al in lu e a c eck that the BCS compl es with the national reg lation in
force at the site where the s stem is inten ed to b u ed
5.3.6 As essment specification
The as es ment sp cification is a doc ment that des rib s what s ould b evaluated The
as es ment sp cification s ould sp cify at le st the fol owin p ints:
– the o jective of the as es ment as stated in 5.2;
– the s stem b u dary as stated in 5.3.1.1;
– the s stem config ration as stated in 5.3.1.2;
– the as es ment matrix as stated in 5.3.2;
– the l st of as es ment items as stated in 5.3.2;
– the l st of tasks as stated in 5.3.3;
– the criteria u ed for fi terin of the items as stated in 5.3.5;
– the referen ed stan ard for e c as es ment item
Trang 17The o jective of desig in an as es ment program is to in re se confiden e in the ju gement
of a s stem's s ita i ty for the s stem mis ion
The as es ment activities s al maximize this in re se in confiden e, whi st remainin within
defined cost an time con traints
The as es ment program s al sp cify the as es ment activities an their seq en e again t
a time s ale in a man er
that ena les the as es ment to b control ed
The as es ment program s al comprise a set of as es ment activities, e c of whic may b :
– either an o servation at s stem level, or
– o servation at lower levels (if neces ary down to an in ivid al element combined with a
s nthesis to s stem level
The desig of the in ivid al as es ment activities is de en ent up n the s stem pro erty
b in con idered
The as es ment program s ould sp cify also detai of e c as es ment activity in lu in :
– typ of evaluation tec niq e; an
– to ls an uti ties req ired
The evaluation tec niq e(s) to b u ed s ould b selected so that the res lts can b
comp red q al tatively an /or q antitatively again t the req irements
The evaluation tec niq es selected may b analytical u in only s stem doc mentation or
they may b empirical, req irin ac es to an evaluation s stem In practice the tec niq es
selected wi b a combination of analy is an empirical tests u in the s stem doc mentation
an a restricted combination of mod les
The as es ment activities s al b plan ed in a logical seq en e a idin by al con traints of
as es ment items identified in the as es ment sp cification For the purp se of selectin
as es ment activities in lu ed in the as es ment program, e c p tential as es ment activity
s ould b analy ed by determinin the fol owin asp cts
– evaluation tec niq es an to ls,
– cost an time req ired to exec te,
– imp rtan e
The ste s of plan in as es ment program s ould b re e ted u ti the program is agre d
up n by al p rties in olved in the as es ment
5.4.2 De eloping a s s me t a tivitie
The l st of as es ment activities s ould b develo ed b sed on the fol owin criteria:
– the typ of analy is an /or evaluation req ired to s p ort the as es ment;
– the imp rtan e of the p rtic lar s stem pro erty to the overal mis ion;
– the imp rtan e of s stem pro erties an influen in factors to the mis ion;
– knowled e an ski req ired to p rform e c analy is an /or test;
– con traints on the as es ment s hed le d e to p rmanent ef ects that tests of the
p rforman e an other s stem pro erties can have;
– tec nical as es ment con traints s c as size, weig t, avai a i ty of uti ties, control of
the test en ironment; an
Trang 18– avai a i ty of a group of selected o erators to p rform distin t tasks for o servation of
o era i ty;
– to ls an uti ties req ired to p rform the analy is an tests;
– avai a i ty of to ls for the as es ment activities;
– estimation of cost an time for e c of the analy is an test;
– estimated cost an time of the as es ment activities;
– priority level for e c of the as es ment activities;
– level of confiden e b sed up n prior knowled e
It is sometimes neces ary to con ider several evaluation tec niq es, whic are mutual y
s p lementary
Al as es ment activities lsts s al b combined into the as es ment program for the s stem
5.4.3 As e sme t program
The as es ment program s ould sp cify at le st the fol owin p ints:
– the evaluation tec niq es selected as stated in 5.4.1;
– the criteria to b ta en into ac ou t as given in 5.4.2;
– the as es ment activities o tained in 5.4.2;
– the req ired in re se in confiden e level;
– the as es ment s hed le ta in ac ou t of the p s ible p rmanent ef ects that tests can
have;
– the fai ure modes to b analy ed an /or evaluated an the res ltin efects exp cted;
– the ph sical integrity an c b r sec rity mec anisms provided in the s stem
5.5 Execution of th a s s ment
The as es ment activities s al b p rformed in ac ordan e with the as es ment program
sp cified in 5.4 an in ac ordan e with the pres rib d as es ment protocol sp cified in 5.2
If an when deviation from the as es ment program or the as es ment protocol are
neces ary, these s ould b re orted in the as es ment re ort an , u les previou ly agre d
contin en y action can b ta en, these s al b a proved by the as es ment authority
Al o servation , me s rements, calc lation s al b recorded at the time they are made for
the as es ment re ort
5.6 Rep rting of the a s s me t
The con u t an res lts of the as es ment s al b doc mented in an as es ment re ort
The as es ment re ort s ould ac urately, cle rly,
u ambiguou ly an o jectively present
the objective, the res lts an al relevant information of the as es ment
The as es ment re orts s al in lu e at le st the folowin informatio :
Trang 19– the s stem config ration s c as typ an n mb r of inputoutput, s an rate req ired,
s stem mis ion, tasks an fu ction ;
– c aracteristic of the mis ion s c as typ of proces in the case of as es ment for a
p rtic lar mis ion
;
– a des ription an identification of the s stem as es ed, in lu in a lst s owin the
hardware with model n mb rs an the sofware u ed with rele se d te;
– a s mmary of the sal ent p ints arisin out of the as es ment an the co clusio s
re ch d;
– an ac ou t of the proced res, method , sp cification an tests (prefera ly s mmarized
in a matrix an s p lemented by referen ed doc ments);
– re son to have selected the p rtic lar as es ment items to evaluate, an re son to
have not selected other as es ment items;
– an deviation from the as es ment program (ad ition or ex lu ion );
– me s rements, tests an derived res lts s p orted by ta les, gra hs, drawin s or
photogra h as a pro riate;
– faiures observe ;
– a statement of the me s rement uncertainties;
– a statement as to whether or not the s stem compl es with the req irements again t
whic the s stem was as es e in luding a statement of an dis re ancies
The format of as es ment re ort s ould b stan ardized to faci tate comp rison of
as es ments of dif ere t s stems The res lts of the as es ment s ould b s p orted by
a pro riate form of information s c as l sts, matrices an gra h
Cor ection or ad ition to the re ort afer its is ue s al b made only by a s p lementary
re ort, refer in to the original re ort identified by its title an n mb r This s p lementary
re ort s al me t the same req irements as the original re ort, if it is ap l cable
6 Ev luation tec niques
The evaluation tec niq e(s), to b u ed, s al b selected so that the res lts can b
comp red q al tatively an /or q antitatively again t the req irements defined in the s stem
req irements doc ment, with the req ired level of confiden e in the evaluation
The tec niq es selected can b analytical, u in only s stem doc mentation an prior
eviden e or data, or in some cases, they can b a combination of an analytical an an
empirical tec niq es, req irin ac es to an evaluation s stem
In practice the tec niq es selected are a combination of analy is an empirical tests u in
the s stem doc mentation an a (restricted) combination of mod les
For this purp se, a model of the s stem s ould b as embled with a selection of fu ction of
the s stem, whic re resents the tasks to b p rformed s f iciently close an i u trates in
detai the two-way commu ication me n provided at the h man-mac ine interface
NOT An e ample of a mo el is d scrib d in IEC 610 9-4:—
2
, An e D
Trang 20Annex A
(informativ )
System Requirements Document (SRD)
An ex A des rib s a method of develo in an reviewin SRD, in lu in c eck p ints for
e c s stem pro erty
A.2 Analy is of system mission
To as es a BCS, it is neces ary to esta l s the s stem mis ion
The s stem mis ion can only b pro erly defined if the s stem is con idered in its context,
i.e the p rson el, the proces to whic it is related, an other related s stems as wel as
the en ironment in whic it o erates
The activities mentioned in A.2.2, A.2.3, A.2.4 an A.2.5 res lt in the s stem requirements
doc ment (SRD)
A.2.2 Formulation of sy tem mis ion
The o jective at this stage is to define the mis ion of, an not the role to b p rformed b ,
the BCS
The des ription of the mis ion s ould state what is to b ac ieved, not wh an how it is
to b ac ieve
The mis ion s ould b ela orated by des ribin its phases These may in lud :
– initial config ration an commis ionin of the total faci ty comprisin p rso n l, plant,
BCS, an other s stems that wi b u ed to ac ompl s the mis ion;
– config ration or set up for sp cific prod ction ru s;
– prod ction, whic may in olve ste d contin ou o eration or programmed seq en es of
s b-op rations;
– c an e-over from one prod ction ru to a other;
– emergen y s utdown or tran ition to a safe holdin state;
– normal s utd wn;
– updates an c an es to the s stem to in orp rate new tasks or fun tio s;
– de-commis ionin of the s stem af er its o erational p ase
Althou h not alway o viou , the s stem generation, commis ionin an d commis ionin
phases are imp rtant phases an can form p rt of the s stem mis io
A.2.3 Analysis of system mission into ta ks
To ac ieve the mis ion, the BCS ne d to p rform sp cific tasks an /or have sp cific
s stem pro erties as ociated with e c of the mis ion phases id ntified a ove These
Trang 21Tasks, within a phase, may b , for example:
– monitorin an central zed display of monitored values, whic may in lu e
proces in
of the me s red varia les to derive values of mis ion v riables;
– activatin a sp cific phase in the proces in ac ordan e with man al y entered or
automatic comma ds;
– automatic proces control, e.g automatic control of an individ al proces v ria le;
– interlock control b twe n proces varia les;
– automatic initiation an exec tion of a phase
The BCS may b req ired to p rform an of the sp cific tasks either completely or p rtial y,
i.e a task s ared with another s stem or
p rso n l
Eac task is defined in s ficient detai to ma e cle r the extent of the task as ign d to the
BCS
For e c of the tasks, the req irements s ould b defined in terms of fu ctional ty,
p rforman e, de en a i ty, o era i ty, s stem safety, an /or other s stem pro erties, e.g
q al ty as uran e, afer sales services, etc
It s ould b noted that at this stage the o jective is to define the tasks of the s stem, not
the fu ction of the s stem
A.2.4 As ignment of relative importance to tasks
The de en en y of the mis ion up n e c of the tasks s ould b con idered at this stage
Tasks s ould b clas ified into at le st groups of imp rtan e to the mis io :
The cor ectnes of the exec tion of e c of the tasks req ired to fulfi the mis ion can be
imp ired by factors whic influen e that exec tion
At this stage, it is neces ary to con ider, for e c of the tasks, the factors whic mig t
influen e the req ired criteria for that task
A.3 Review of sy tem re uirements docume t (SRD)
The g idan e a out c eck p ints of the s stem req irements doc ment for e c typ of
pro erty is provided in An ex A of the p rt cor esp n in to the pro erty
The efectivenes of the as es ment is de en ent up n a comprehen ive statement of
req irements
Trang 22Annex B
(informativ )
System Specification Document (SSD)
An ex B des rib s method of develo in an reviewing SSD, in lu in c eck p ints for e c
s stem pro erty
B.2 Development of system specification document
B.2.1 General
The startin p int for sp cifyin the SSD is the SRD as bro en down into tasks with
as ig ed relative imp rtan e
From this an the ma pin of the tasks on the fu ctional model (se 5.1 1 a d
IEC 610 9-1:—, Fig re 4), it wi b p s ible to derive a s stem implementation, whic sets
out to ad res the s stem re uirements
Durin the as es ment phase, the s stem pro osed by SSD wi b comp red with the
detai e mis ion statement as laid down in the s stem req irements d c ment
In order to ena le ef ective analy is of compl an e with the s stem req irements, it is
imp rtant that the sp cification of the s stem pro osed identifies variou k y p ints These
are examined in detai in B.2.2 to B.2.7
The activities, mentioned in B.2.2 to B.2.7, res lt in the s stem sp cification doc ment
B.2.2 System overview
The intent of the overview is to relate the s stem implementation to the s stem mis ion as
reflected in the SRD
Simi arly as the mis ion can b bro en down hierarc ical y into tasks, the s stem to be
as es ed can b hierarc ical y decomp sed into mod les an eleme ts
It is en isaged that the decomp sition le d to overview diagrams an s p lementary
des riptio s
These s ould at le st contain information on the fol owin s bjects:
– al mod les interfacin to the proces , to the o erator, to external s stems, etc
– commu ication mo ules;
– a plcation proces in mo ules;
– interaction b twe n mod les, an
– relative an a solute distan es an location of mo ules
For the decomp sition it is imp rtant to know that the majority of modern BCSs are b sed on
a h brid-arc itecture, comp sed of a combination of se arate me s rement an control
Trang 23B.2.3 Defining system boundarie
A s stem has several distin t b u daries, namely, to the proces , to the uti ties s p lying
the energ , to the en ironment in whic the s stem is placed, to other con ected extern l
s stems an to the s stem u ers (o erators, maintenan e p rso nel)
The b u dary of the s stem is careful y defined by identifyin "what do s an what do s
not" b lon to the s stem to b as es ed, ta in into ac ou t at le st the fol owing
co sideratio s:
– The b u dary to the proces can b placed so as to in lu e or ex lu e sign l
con itioners, galvanic isolators, mars al n u its, ca les, inputoutput devices s c as
sen ors an final control elements, etc
– The b u dary to the uti ties is defined to ta e into ac ou t the e uipment from dif erent
man facturers s c as those for u inter upted p wer s p les, b t eries, fiIters,
reg lators, etc e c of whic can s p ly al or p rt of the s stem in lu in the sen ors
an final control elements
– The b u dary to external eq ipment s ould ta e into ac ou t the req ired interfaces,
commu ication fu ction , ca les, etc
– The b u dary to the en ironment s ould ta e into ac ou t the ph sical distributio of
the mod les an elements, whic may b placed in an air con itioned
ro m, in an of ice
en ironment, in the proces are or directly on the proces e uipment itself, etc
– The b u dary to the h man interface is p rtic larly imp rtant when as es in the
s stem de en a i ty, sin e o erational an maintenan e p rson el have an imp rtant
role to play in the completion of the inten ed mis ion The interaction of p o le a d
s stem ta es place at several levels of the control hierarc y an de en s hig ly on the
mode of o eration u der con ideration an in olves al hardware an sofware mo ules
of the s stem
– Althou h it is not o viou , the tasks themselves are external to the
s stem b u dary The
influen es of imp sin , modifyin an ad in tasks are imp rta t asp cts in the
as es ment of the s stem "flexibi ty an exp n a i ty" prop rties
When the as es me t o jectiv is "to o tain a c mparativ as es ment of dif erent
s stems", it mig t not b po sible to define the bou daries in exactly the same man er
for e c of the s stems to be c mpared if these s stems have a diferent fu ctional s o e
In this case, other equipment, foreign to the s stem u der c nsideration, s ould b ad ed
to ma e the c mp ris n po sible A specific note s ould b made of the eq ipment
add d
B.2.4 Specific tion of system
The intent of the s stem sp cification is to provide the precise n merical, o erational a d
relational data for the pro osed s stem implementation
It s ould typical y co tain:
– a complete lst of al mod les an elements;
– prod ct sp cification for e c typ of mod le an element, givin ge eral, fu ctional an
tec nical sp cification , an in lu in en ironmental sp cificatio s;
– detai ed intercon ection diagrams identifyin an further sp cifyin the intercon ection
an intercommu ication b twe n in ivid al mod le(s) an eleme t s), in lu in
red n ant p thway , if a pl ca le
B.2.5 De cription of system operation
The intent of the des ription of the o eration of the s stem is to in icate in a s stematic
Trang 24This s stematic des ription s ould b on a task-by- ask b sis an typical y co tain:
– a l st of the fu ction pro osed to p rform e c
task;
– a commentary s owin , for e c task, the way in whic the pro osed mo ules an
elements provide these functio s
The level of detai n the implementation of the task(s) an the extent of sub ivisio into
mod les an elements s ould b only that whic is neces ary, yet s f icient to demon trate
that the req irements are met
B.2.6 Statement of system implementation rationale
For the purp se of the as es ment, the definition of the s stem implementation s ould be
s p orted by statements of the u derlyin ratio ale
Su h statements s ould ad res one by one e c of the pro erties (se 5.2) relevant for the
s stem mis ion an provide ad itional information relatin to the
ration le of the s stem
implementation to the ac ievement of the req ired s stem pro erties This mig t includ :
– re son for selection b twe n aIternative solutio s;
– s p ortin data (e.g field exp rien e), calc lation , etc
– s p ortin test
re orts
B.2.7 Statement of compl anc with system requirements
Expl cit statements are made for e c of the s stem requirements not matc ed by the
pro osed s stem, definin the nature an the extent of the no -compl a ce
Trang 25Annex C
(informativ )
Examples of col ation documentation
An ex C provides examples of col ation doc mentation
C.2 Example of furnace c ntrol documentation
C.2.2.1 Control an /or c lc lating algorithm
Temp rature c ntrol
The s stem s ould in lu e al mod les an elements that alow the task as des ribed to b
fulfi ed The control n elements (control valves) an sen ors are outside the s o e
C.2.3 Input c ara teristic
Trang 26Ty e : 4 mA to 2 mA, intrinsic ly safe
Ch ra teristic : ln ar with difere tial pres ure
Ch ra teristic : ln ar with pres ure
C.2.4 Output c ara teristic
En in erin u its : ln ar, to s p r h ur
Power su ply : from e tern l so rc , 2 Vd.c
Ch ra teristic : two p sitio , o e /close
Trang 27: ma u l: o tp t v lu OV2, ma u l: sla e CB2, a tomatic: sla eCB2, ma u l:
master CB1, a tomatic: master CB1
C.2.6 Monitoring function
fu ction {MV2 5} = con tant [s uare ro t {MV2*MV3*MV4/ MV5 varia le) ]
C.2.8.3 Adding a control bloc
The ad ition of another control block to control the amou t of fuel-oi with set p int SPy an
output OVx, simi ar to the control block as sp cified for u der C.2.2 a ove for OV2 an with
the same en an ements as u der C.2.8.2
C.2.8.4 Adding a fu ction
The ad ition of a logic fu ction with the fol owin p s ibi ties:
– fuel-oi an fuel-gas outputs on man al control;
– fuel-oi an fuel-gas outputs on automatic control;
– fuel-oi on automatic control an fuel-gas on master-slave from temp rature control;
– fuel-oi an fuel-gas b th on master-slave, where y it is p s ible to set the ratio b twe n
Trang 28C.2.8.5 Adding a e ternal con e tion
The con ection of the s stem to an o timizin an management information s stem in lu in
data col ection an manipulation of control-p rameters
C.2.9 Function l ty col ation table
Trang 30C.2.9.2 Config rabi ity
Table C.2 – SRD configurabi ty a aly is
:
Co trol/
Me
Trang 32requirement
:
PID c ntrol
lo ic c ntrol
Tre ds a)
Trang 33requirement
Trang 34C.3 Example of simple c ntrol loop task documentation
C.3.3 Information flows
Keyb ard manipulated proces action: o erator station → output
Proces me s rement in ication: me s red value → o erator station
Ta le C.4 s ows an example of p rforman e ta le for information flow
Table C.4 – Performa c for information flow
Ta le C.5 s ows an example of p rforman e ta le for information tran lation
Trang 35Table C.5 – Information tra slation
C.3.5 Performa c col ation table
Ta le C.6 s ows an example of p rforman e col ation ta le
Trang 36Type Imp r anc Informatio
Trang 37C.4 Example of c l ation documentation ( rom SRD of a ma ter-slave c ntrol
task)
Clau e C.4 provides an example of des ription whic provide req irements of de en a i ty
of a master-slave control task in the SRD
– me s red value 1: > hig , normal, < low
– me s red value 2: > hig , normal, < low
– set p int: > hig , normal, < low
Pos ible states of output s):
– output: ful y o en, frozen, flo tin , ful y closed
Ta le C.7 provides an example of a con ise method to des rib the b u dary states of a task
Trang 38Table C.7 – Fai ure state of ta k input a d output
1 De e din o th b u d ry of th system u d r as es me t, th in uts from me sureme ts ma or ma n t
b u d r c ntrol of th system In th c se of th e ample, th me sureme ts are o tsid th b u d ry a d
h n e th term “e p cte ” fre u n y of e e t is n te , e u ly th “time to restore” is n t a system
c nsid ratio Th setp int is c ntrole via a k y o rd a d h n e u d r system c ntrol
2 N = n n-a plc ble
3 * = Thisq a tity is n t a system pro erty
C.5 Example of c l ation documentation ( rom SSD of a ma ter-slave c ntrol
task)
Clau e C.5 provides an example of des ription whic provide sp cification of a m
aster-slave control task related to de en a i ty in the SRD
Ta le C.8 provides an example of a de en a i ty colation doc ment for a master-slave
control task
Trang 39Table C.8 – Depe d bi ity
Trang 40Bibl ography
[1] IEC TS 6 6 3-1:2 14, Industrial p roces co trol systems – Gu ideln for e alu atn
p roces co trol systems – Part 1: Sp ecificato s
[2] IEC 6 5 4-1:2 13, Th rmocouple s – Part 1: EMFspe cificato s a d tolera ces
[3] ISO 9 01:2 15, Qu al y ma ageme t systems – Re u ireme nts
[4] IEC 610 9-4:—, Industrialp roces me sureme t, co trol a d automato –Ev lu ato
of system p rop erte s for th p urp ose of system as es m ent – Part 4: As e ssme nt of
system p erforma ce
[5] IEC 617 9, Ele ctric com po e ts – Relab il y – Refere ce co di o s forfaiure rate s
a d stre ss models forco v rsio