Amendment 2 - Industrial communication networks - Profiles - Part 3-18: Functional safety fieldbuses - Additional specifications for CPF 18

Amendement 2 - Réseaux de communication industriels - Profils - Partie 3-18: Bus de terrain de sécurité fonctionnelle - Spécifications supplémentaires pour CPF 18

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IEC 61784-3-18
Edition 1.0 2021-04
Industrial communication networks – Profiles –
Part 3-18: Functional safety fieldbuses – Additional specifications for CPF 18
Réseaux de communication industriels – Profils –
Partie 3-18: Bus de terrain de sécurité fonctionnelle – Spécifications
supplémentaires pour CPF 18
IEC 61784-3-18:2011-04/AMD2:2021-04(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61784-3-18
Edition 1.0 2021-04
Industrial communication networks – Profiles –
Part 3-18: Functional safety fieldbuses – Additional specifications for CPF 18
Réseaux de communication industriels – Profils –
Partie 3-18: Bus de terrain de sécurité fonctionnelle – Spécifications
supplémentaires pour CPF 18
ICS 25.040.40; 35.100.05 ISBN 978-2-8322-9757-5

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61784-3-18:2011/AMD2:2021
© IEC 2021
Part 3-18: Functional safety fieldbuses –
Additional specifications for CPF 18

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Amendment 2 to IEC 61784-3-18:2011 has been prepared by subcommittee 65C: Industrial

networks, of IEC technical committee 65: Industrial-process measurement, control and

---------------------- Page: 4 ----------------------
IEC 61784-3-18:2011/AMD2:2021 – 3 –
© IEC 2021
The text of this Amendment is based on the following documents:
FDIS Report on voting
65C/1083/FDIS 65C/1087/RVD

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this International Standard is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement,

available at The main document types developed by

IEC are described in greater detail at

A list of all parts of the IEC 61784-3 series, published under the general title Industrial

communication networks – Profiles – Functional safety fieldbuses, can be found on the IEC


The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it

colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.
INTRODUCTION to Amendment 2

This Amendment 2 introduces several editorial and informational corrections in the context of

Edition 4 of IEC 61784-3.
---------------------- Page: 5 ----------------------
– 4 – IEC 61784-3-18:2011/AMD2:2021
© IEC 2021
0 Introduction
0.1 General
Replace the existing Figure 1 by the following new figure:

Replace the existing text of the NOTE below Figure 1 (before the title) by the following:

IEC 62061 specifies the relationship between PL (Category) and SIL.
---------------------- Page: 6 ----------------------
IEC 61784-3-18:2011/AMD2:2021 – 5 –
© IEC 2021
Replace the existing Figure 2 by the following new figure:

Replace, below Figure 2, the existing text of figure footnote a by the following:

For specified electromagnetic environments; otherwise IEC 61326-3-1 or IEC 61000-6-7.

Delete, below Figure 2, figure footnote b.
5 General
5.1 External documents providing specifications for the profile
Replace the existing text by the following:
There is no additional external document used for FSCP 18/1.
7 Safety communication layer protocol Safety data
Delete, at the end of second paragraph: "as proven in 9.5.2". SPDO CRC
Replace, in second paragraph: "0x20044009" with "0x120044009".
---------------------- Page: 7 ----------------------
– 6 – IEC 61784-3-18:2011/AMD2:2021
© IEC 2021
Replace, at the end of second paragraph: "9.5.2" with "Clause A.1". SHB CRC
Replace, in second paragraph: "0x20044009" with "0x120044009".
Replace, at the end of second paragraph: "9.5.2" with "Clause A.1".
9 System requirements
9.5 Constraints for calculation of system characteristics
Delete Subclause 9.5.2.
Annex A – Additional information for functional safety communication profiles
of CPF 18
Delete the sentence: "There is no additional information for this FSCP. "
Add the following new Clauses A.1 and A.2.
A.1 Hash function calculation
The 32-bit CRC used in this FSCP is 0x120044009. It is calculated by:
G(x) = x32 + x29 + x18 + x14 + x3 + 1

Table A.1 contains the residual error probabilities for the used 32-bit polynomial for different

code length and bit error probabilities in the range of 120 bits up to data lengths of 1 024 bits

(128 octets) as specified in including the CRC signature and incorporating the overall

safety PDU structure as described in 7.1.
Table A.1 – Residual error probabilities for CRC32 Polynomial 0x120044009
Length P = 0,000 1 P = 0,001 P = 0,01 P = 2/n P = 4/n P = 8/n
n (bits)
(2/n < 0,01) (4/n < 0,01) (8/n < 0,01)
120 1,4236765E-22 1,2847875E-16 4,5824514E-11 - - -
128 1,5805978E-22 1,4161637E-16 4,6991099E-11 - - -
136 1,8162338E-22 1,6156082E-16 4,9874896E-11 - - -
144 2,0514920E-22 1,8117854E-16 5,2040784E-11 - - -
152 2,2863728E-22 2,0047350E-16 5,3582492E-11 - - -
160 2,5208766E-22 2,1944972E-16 5,4586144E-11 - - -
168 2,7550040E-22 2,3811128E-16 5,5130780E-11 - - -
176 2,9887554E-22 2,5646232E-16 5,5287180E-11 - - -
184 3,2221313E-22 2,7450668E-16 5,5112762E-11 - - -
192 3,4551322E-22 2,9224828E-16 5,4660017E-11 - - -
200 3,6877585E-22 3,0969120E-16 5,3978908E-11 - - -
208 3,9200108E-22 3,2683958E-16 5,3114126E-11 4,5363410E-11 - -
216 4,1518896E-22 3,4369773E-16 5,2107322E-11 3,8340651E-11 - -
---------------------- Page: 8 ----------------------
IEC 61784-3-18:2011/AMD2:2021 – 7 –
© IEC 2021
Length P = 0,000 1 P = 0,001 P = 0,01 P = 2/n P = 4/n P = 8/n
n (bits)
(2/n < 0,01) (4/n < 0,01) (8/n < 0,01)
224 4,3833955E-22 3,6026990E-16 5,0993464E-11 3,2582177E-11 - -
232 4,6145289E-22 3,7656011E-16 4,9799302E-11 2,7831581E-11 - -
240 4,8452904E-22 3,9257249E-16 4,8549670E-11 2,3890359E-11 - -
248 5,1342460E-22 4,1302103E-16 4,7793792E-11 2,0835782E-11 - -
256 5,4812557E-22 4,3779805E-16 4,7436262E-11 1,8425386E-11 - -
264 6,0226140E-22 4,7761306E-16 4,8446976E-11 1,6861505E-11 - -
272 6,5631043E-22 5,1677587E-16 4,9125798E-11 1,5393430E-11 - -
280 7,1027278E-22 5,5529640E-16 4,9531005E-11 1,4033750E-11 - -
288 7,6609297E-22 5,9469202E-16 4,9823553E-11 1,2816366E-11 - -
296 8,4708043E-22 6,5289301E-16 5,1327670E-11 1,2045553E-11 - -
304 9,4735087E-22 7,2499111E-16 5,3455513E-11 1,1495922E-11 - -
312 1,0629785E-21 8,0770133E-16 5,5857692E-11 1,1051648E-11 - -
320 1,1997408E-21 9,0514335E-16 5,8700560E-11 1,0726971E-11 - -
328 1,3556504E-21 1,0155031E-15 6,1761475E-11 1,0461785E-11 - -
336 1,5635573E-21 1,1628976E-15 6,6182448E-11 1,0442536E-11 - -
344 1,7865996E-21 1,3193279E-15 7,0326876E-11 1,0364686E-11 - -
352 2,0208766E-21 1,4817260E-15 7,4063469E-11 1,0220115E-11 - -
360 2,2682916E-21 1,6513297E-15 7,7479396E-11 1,0033566E-11 - -
368 2,5596749E-21 1,8502188E-15 8,1427739E-11 9,9296272E-12 - -
376 2,8756472E-21 2,0638556E-15 8,5243247E-11 9,8117258E-12 - -
384 3,2257781E-21 2,2987099E-15 8,9120472E-11 9,7068404E-12 - -
392 3,6215308E-21 2,5623985E-15 9,3232281E-11 9,6349408E-12 - -
400 4,0474134E-21 2,8434089E-15 9,7154398E-11 9,5450782E-12 9,7154463E-11 -
408 4,4841413E-21 3,1279116E-15 1,0051444E-10 9,3994061E-12 9,5832532E-11 -
416 4,9854381E-21 3,4529390E-15 1,0429003E-10 9,3077961E-12 9,4989209E-11 -
424 5,5396395E-21 3,8095810E-15 1,0814832E-10 9,2317820E-12 9,4283299E-11 -
432 6,1408682E-21 4,1931171E-15 1,1192889E-10 9,1545167E-12 9,3568240E-11 -
440 6,7985857E-21 4,6093325E-15 1,1572055E-10 9,0848438E-12 9,2923099E-11 -
448 7,5413586E-21 5,0766681E-15 1,1981327E-10 9,0497343E-12 9,2585427E-11 -
456 8,4186936E-21 5,6269908E-15 1,2464279E-10 9,0864545E-12 9,2881442E-11 -
464 9,3882365E-21 6,2304218E-15 1,2953135E-10 9,1304457E-12 9,3242112E-11 -
472 1,0453583E-20 6,8881152E-15 1,3441887E-10 9,1770946E-12 9,3626526E-11 -
480 1,1633575E-20 7,6111313E-15 1,3939755E-10 9,2345837E-12 9,4106788E-11 -
488 1,2863137E-20 8,3558251E-15 1,4382888E-10 9,2499280E-12 9,4218577E-11 -
496 1,4138339E-20 9,1191171E-15 1,4772488E-10 9,2271096E-12 9,3995500E-11 -
504 1,5508543E-20 9,9320460E-15 1,5148383E-10 9,2003769E-12 9,3738785E-11 -
512 1,6943099E-20 1,0774025E-14 1,5487542E-10 9,1517955E-12 9,3292441E-11 -
520 1,8445650E-20 1,1646634E-14 1,5794572E-10 9,0859281E-12 9,2696011E-11 -
528 2,0038809E-20 1,2563251E-14 1,6083659E-10 9,0145834E-12 9,2053257E-11 -
536 2,1716667E-20 1,3519161E-14 1,6350334E-10 8,9348614E-12 9,1336910E-11 -
544 2,3528296E-20 1,4543648E-14 1,6618275E-10 8,8648100E-12 9,0704765E-11 -
552 2,5463901E-20 1,5629140E-14 1,6878262E-10 8,7973089E-12 9,0095698E-11 -
560 2,7508047E-20 1,6764851E-14 1,7122196E-10 8,7256222E-12 8,9450634E-11 -
---------------------- Page: 9 ----------------------
– 8 – IEC 61784-3-18:2011/AMD2:2021
© IEC 2021
Length P = 0,000 1 P = 0,001 P = 0,01 P = 2/n P = 4/n P = 8/n
n (bits)
(2/n < 0,01) (4/n < 0,01) (8/n < 0,01)
568 2,9662361E-20 1,7950558E-14 1,7349764E-10 8,6497338E-12 8,8770222E-11 -
576 3,1941688E-20 1,9193948E-14 1,7565753E-10 8,5731468E-12 8,8083883E-11 -
584 3,4391030E-20 2,0520402E-14 1,7783777E-10 8,5055102E-12 8,7477956E-11 -
592 3,7057131E-20 2,1955572E-14 1,8013261E-10 8,4538034E-12 8,7011456E-11 -
600 3,9903657E-20 2,3475690E-14 1,8237918E-10 8,4059524E-12 8,6578391E-11 -
608 4,2982901E-20 2,5109187E-14 1,8468353E-10 8,3695132E-12 8,6244617E-11 -
616 4,6279247E-20 2,6844449E-14 1,8696122E-10 8,3380158E-12 8,5955406E-11 -
624 4,9820371E-20 2,8694975E-14 1,8923972E-10 8,3134178E-12 8,5727711E-11 -
632 5,3590654E-20 3,0649202E-14 1,9144892E-10 8,2905610E-12 8,5515777E-11 -
640 5,7516332E-20 3,2663032E-14 1,9343615E-10 8,2576655E-12 8,5215707E-11 -
648 6,1673927E-20 3,4777895E-14 1,9534408E-10 8,2252391E-12 8,4921706E-11 -
656 6,6062878E-20 3,6991091E-14 1,9715750E-10 8,1919705E-12 8,4620212E-11 -
664 7,0637681E-20 3,9275117E-14 1,9880110E-10 8,1519464E-12 8,4260023E-11 -
672 7,5386656E-20 4,1621796E-14 2,0026705E-10 8,1043182E-12 8,3834377E-11 -
680 8,0356121E-20 4,4054787E-14 2,0162600E-10 8,0541279E-12 8,3386566E-11 -
688 8,5635210E-20 4,6620222E-14 2,0297999E-10 8,0090201E-12 8,2984111E-11 -
696 9,1165308E-20 4,9283501E-14 2,0424453E-10 7,9623964E-12 8,2568620E-11 -
704 9,7031602E-20 5,2087692E-14 2,0550110E-10 7,9204218E-12 8,2193635E-11 -
712 1,0333205E-19 5,5081361E-14 2,0681774E-10 7,8885969E-12 8,1907076E-11 -
720 1,1000416E-19 5,8227282E-14 2,0810912E-10 7,8600426E-12 8,1649426E-11 -
728 1,1711772E-19 6,1558301E-14 2,0941199E-10 7,8377961E-12 8,1447514E-11 -
736 1,2455641E-19 6,5009818E-14 2,1062129E-10 7,8129943E-12 8,1224133E-11 -
744 1,3232872E-19 6,8583268E-14 2,1174313E-10 7,7857987E-12 8,0979233E-11 -
752 1,4052665E-19 7,2322660E-14 2,1283238E-10 7,7607231E-12 8,0754068E-11 -
760 1,4911393E-19 7,6205658E-14 2,1385825E-10 7,7349134E-12 8,0521981E-11 -
768 1,5805440E-19 8,0210571E-14 2,1479807E-10 7,7061501E-12 8,0264808E-11 -
776 1,6741016E-19 8,4365416E-14 2,1568363E-10 7,6770096E-12 8,0003402E-11 -
784 1,7725792E-19 8,8704625E-14 2,1654574E-10 7,6500994E-12 7,9762003E-11 -
792 1,8761682E-19 9,3233243E-14 2,1738322E-10 7,6251985E-12 7,9540042E-11 -

800 1,9851887E-19 9,7962401E-14 2,1819883E-10 7,6025501E-12 7,9336307E-11 2,1819883E-10

808 2,0987600E-19 1,0284454E-13 2,1895363E-10 7,5782009E-12 7,9118288E-11 2,1793283E-10

816 2,2176826E-19 1,0791450E-13 2,1967425E-10 7,5544679E-12 7,8905614E-11 2,1767439E-10

824 2,3419250E-19 1,1316622E-13 2,2035471E-10 7,5306262E-12 7,8692731E-11 2,1741553E-10

832 2,4726160E-19 1,1864890E-13 2,2102202E-10 7,5094219E-12 7,8502470E-11 2,1718358E-10

840 2,6084704E-19 1,2429641E-13 2,2163585E-10 7,4864440E-12 7,8297015E-11 2,1693343E-10

848 2,7496962E-19 1,3011436E-13 2,2220228E-10 7,4620265E-12 7,8080191E-11 2,1666866E-10

856 2,8958763E-19 1,3607912E-13 2,2271302E-10 7,4349302E-12 7,7837269E-11 2,1637651E-10

864 3,0485219E-19 1,4225675E-13 2,2320162E-10 7,4086247E-12 7,7604294E-11 2,1609304E-10

872 3,2078376E-19 1,4865144E-13 2,2366881E-10 7,3830309E-12 7,7375796E-11 2,1581768E-10

880 3,3729825E-19 1,5521961E-13 2,2409695E-10 7,3559126E-12 7,7134897E-11 2,1552708E-10

888 3,5453522E-19 1,6201998E-13 2,2450952E-10 7,3298555E-12 7,6903129E-11 2,1524826E-10

896 3,7260638E-19 1,6909701E-13 2,2491863E-10 7,3064026E-12 7,6695005E-11 2,1499642E-10

904 3,9139085E-19 1,7639021E-13 2,2530250E-10 7,2826816E-12 7,6484554E-11 2,1474226E-10

---------------------- Page: 10 ----------------------
IEC 61784-3-18:2011/AMD2:2021 – 9 –
© IEC 2021
Length P = 0,000 1 P = 0,001 P = 0,01 P = 2/n P = 4/n P = 8/n
n (bits)
(2/n < 0,01) (4/n < 0,01) (8/n < 0,01)

912 4,1094170E-19 1,8391771E-13 2,2566690E-10 7,2592645E-12 7,6276641E-11 2,1449176E-10

920 4,3149802E-19 1,9177870E-13 2,2603648E-10 7,2395448E-12 7,6100259E-11 2,1427904E-10

928 4,5285674E-19 1,9987672E-13 2,2638307E-10 7,2195852E-12 7,5922583E-11 2,1406390E-10

936 4,7511613E-19 2,0824843E-13 2,2671545E-10 7,2004844E-12 7,5752432E-11 2,1385768E-10

944 4,9812106E-19 2,1682048E-13 2,2701775E-10 7,1796799E-12 7,5567534E-11 2,1363440E-10

952 5,2211533E-19 2,2569173E-13 2,2731159E-10 7,1602491E-12 7,5394612E-11 2,1342565E-10

960 5,4694563E-19 2,3478996E-13 2,2758219E-10 7,1398017E-12 7,5212955E-11 2,1320663E-10

968 5,7273710E-19 2,4416203E-13 2,2783927E-10 7,1196502E-12 7,5034031E-11 2,1299117E-10

976 5,9964168E-19 2,5386459E-13 2,2809125E-10 7,1011601E-12 7,4869001E-11 2,1279303E-10

984 6,2750975E-19 2,6382758E-13 2,2832632E-10 7,0822275E-12 7,4701179E-11 2,1259066E-10

992 6,5649845E-19 2,7410911E-13 2,2855304E-10 7,0642280E-12 7,4541811E-11 2,1239812E-10

1000 6,8665031E-19 2,8471872E-13 2,2877180E-10 7,0471750E-12 7,4390378E-11 2,1221562E-10

1008 7,1800231E-19 2,9566333E-13 2,2898236E-10 7,0310126E-12 7,4246304E-11 2,1204228E-10

1016 7,5046837E-19 3,0690001E-13 2,2917944E-10 7,0146000E-12 7,4100550E-11 2,1186647E-10

1024 7,8405842E-19 3,1842537E-13 2,2936321E-10 6,9977961E-12 7,3951436E-11 2,1168675E-10

A.2 Void
Remove the document in entry [2] and replace it with "Void".
Replace the number and title of document in entry [3] by the following:

[3] IEC 61000-1-2, Electromagnetic compatibility (EMC) – Part 1-2: General – Methodology

for the achievement of functional safety of electrical and electronic systems including

equipment with regard to electromagnetic phenomena
Remove footnote 5 in entry [4].
Remove the document in entry [14] and replace it with "Void".
Remove footnote 6 associated with removed document in entry [14].

Remove the documents in entries [28], [32] and [33] and replace each one with "Void".

Remove the document in entry [34] and replace it with "Void".
Remove footnote 7 associated with removed document in entry [34].
Remove the document in entry [41] and replace it with "Void".
Add, at the end of Bibliography, the following new references:
---------------------- Page: 11 ----------------------
– 10 – IEC 61784-3-18:2011/AMD2:2021
© IEC 2021

[48] IEC 61000-6-7, Electromagnetic compatibility (EMC) – Part 6-7: Generic standards –

Immunity requirements for equipment intended to perform functions in a safety-related

system (functional safety) in industrial locations

[49] IEC 61010-2-201, Safety requirements for electrical equipment for measurement,

control and laboratory use – Part 2-201: Particular requirements for control equipment

[50] IEC 61784-3 (all parts), Industrial communication networks – Profiles – Part 3:

Functional safety fieldbuses

[51] ISO 13849 (all parts), Safety of machinery – Safety-related parts of control systems

---------------------- Page: 12 ----------------------
– 12 – IEC 61784-3-18:2011/AMD2:2021
© IEC 2021
Partie 3-18: Bus de terrain de sécurité fonctionnelle –
Spécifications supplémentaires pour CPF 18

1) La Commission Electrotechnique Internationale (IEC) est une organisation mondiale de normalisation composée

de l'ensemble des comités électrotechniques nationaux (Comités nationaux de l'IEC). L'IEC a pour objet de

favoriser la coopération internationale pour toutes les questions de normalisation dans les domaines de

l'électricité et de l'électronique. A cet effet, l'IEC – entre autres activités – publie des Normes internationales,

des Spécifications techniques, des Rapports techniques, des Spécifications accessibles au public (PAS) et des

Guides (ci-après dénommés "Publication(s) de l'IEC"). Leur élaboration est confiée à des comités d'études, aux

travaux desquels tout Comité national intéressé par le sujet traité peut participer. Les organisations

internationales, gouvernementales et non gouvernementales, en liaison avec l'IEC, participent également aux

travaux. L'IEC collabore étroitement avec l'Organisation Internationale de Normalisation (ISO), selon des

conditions fixées par accord entre les deux organisations.

2) Les décisions ou accords officiels de l'IEC concernant les questions techniques représentent, dans la mesure du

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de droits de brevet. L'IEC ne saurait être tenue pour responsable de ne pas avoir identifié de tels droits de


L'Amendement 2 à l'IEC 61784-3-18:2011 a été établi par le sous-comité 65C: Réseaux

industriels, du comité d'études 65 de l'IEC: Mesure, commande et automation dans les

processus industriels.
---------------------- Page: 13 ----------------------
IEC 61784-3-18:2011/AMD2:2021 – 13 –
© IEC 2021
Le texte de cet Amendement est issu des documents suivants:
FDIS Rapport de vote
65C/1083/FDIS 65C/1087/RVD

Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant

abouti à son approbation.
La version française de la norme n’a pas été soumise au vote.

La langue employée pour l'élaboration de cette Norme internationale est l'anglais.

Le présent document a été rédigé selon les Directives ISO/IEC, Partie 2, il a été développé

selon les Directives ISO/IEC, Partie 1 et les Directives ISO/IEC, Supplément IEC, disponibles

sous Les principaux types de documents développés

par l'IEC sont décrits plus en détail sous w

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