IEC 61784-3-18:2011/AMD1:2016

IEC 61784-3-18 ®
Edition 1.0 2016-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AM ENDMENT 1
AM ENDEMENT 1
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 le CPF 18

IEC 61784-3-18:2011-04/AMD1:2016-07(en-fr)

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IEC 61784-3-18 ®
Edition 1.0 2016-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AM ENDMENT 1
AM ENDEMENT 1
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 le CPF 18

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.110; 25.040.40, 35.100.05 ISBN 978-2-8322-3479-2

– 2 – IEC 61784-3-18:2011/AMD1:2016
 IEC 2016
FOREWORD
This amendment has been prepared by subcommittee 65C: Industrial networks, of IEC
technical committee 65: Industrial-process measurement, control and automation.
The text of this amendment is based on the following documents:
FDIS Report on voting
65C/851/FDIS 65C/854/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the stability date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
 IEC 2016
5 General
5.2 Safety functional requirements
Add, in this subclause, at the end of the list, the following new items:
–9
• For devices using protocol version 2 (see 7.1.3.4) it is required to add 10 to the PFH
of the device hardware to account for the communication channel.
NOTE In this way, the user of the device will not have to account for the number of logical connections
within a safety function.
• The use of error correction mechanisms in the black channel is permitted.
7 Safety communication layer protocol
7.1.2.1 SPDO structure
Replace, in this subclause, the existing Table 4 by the following new table:
Table 4 – SPDO PDU structure
Octet offset Data field Description
0 to 2 PID Packet ID
3 Length Length of the complete packet in octets
4 to 4+n-1 Safety data 1 Mapped safety application process data
4+n to 5+n SID 1 Safety ID of the sender
6+n to 6+n+m-1 Consecutive number 1 Consecutive number for sequencing and application
monitoring where:
m = 1 for protocol version 1
m = 3 for protocol version 2
7+n+m to 10+n+m CRC 1 32 bit cyclic redundancy check covering data fields
PID, safety data 1, SID 1 and consecutive number 1
11+n+m to 11+2n-1+m Safety data 2 Copy of mapped safety application process data
11+2n+m to 12+2n+m SID 2 Copy of SID 1
13+2n+m to 13+2n+2m-1 Consecutive number 2 Copy of consecutive number 1
14+2n+2m to 17+2n+2m CRC 2 32 bit cyclic redundancy check covering data fields
PID, safety data 2, SID 2 and consecutive number 2
NOTE 1 n is the length in octets of the data field safety data 1 (safety data 2).
NOTE 2 m is the length of the consecutive number depending on the protocol version (see 7.1.3.4).

7.1.2.4 Safety data
Replace, in this subclause, second paragraph:
“117 octets” by “115 octets for protocol version 2 or respectively 117 octets for protocol
version 1”.
7.1.2.6 SPDO consecutive number
Replace, in this subclause, “an 8 bit” by “a”.
Add, at the end of this subclause, the following text:
The size of the consecutive number depends on the protocol version (see 7.1.3.4) and is 1
octet for protocol version 1 and 3 octets for protocol version 2.

– 4 – IEC 61784-3-18:2011/AMD1:2016
 IEC 2016
7.1.2.7 SPDO CRC
Delete, in this subclause, first paragraph, ”length”.
7.1.3.1.1 SHB request PDU
Table 5 – SHB request PDU structure
Replace, in this subclause, the existing Table 5 by the following new table:
Table 5 – SHB request PDU structure
Octet offset Data field Description
0 to 2 PID Packet ID
3 Length Length of the complete packet in octets
4 SCL state 1 SALMT state (see Table 7)
5 to 5+n-1 Safety AP state 1 Safety application process state (implementation specific)
6+n to 7+n SID 1 Safety ID of the sender
8+n to 8+n+m-1 Consecutive number 1 Consecutive number for sequencing and application
monitoring where:
m = 1 for protocol version 1
m = 3 for protocol version 2
9+n+m to 12+n+m CRC 1 32 bit cyclic redundancy check covering data fields PID,
SCL state 1, Safety AP state 1, SID 1 and consecutive
number 1
13+n+m SCL state 2 Copy of SALMT state 1
14+n+m to 14+2n+m-1 Safety AP state 2 Copy of safety application process state 1
15+2n+m to 16+2n+m SID 2 Copy of SID 1
17+2n+m to 17+2n+2m-1 Consecutive number 2 Copy of consecutive number 1
18+2n+2m to 21+2n+2m CRC 2 32 bit cyclic redundancy check covering data fields PID,
SCL state 2, Safety AP state 2, SID 2 and consecutive
number 2
NOTE 1 n is the length in octets of the data field Safety AP state.
NOTE 2 m is the length of the consecutive number, depending on the protocol version (see 7.1.3.4).

 IEC 2016
7.1.3.1.2 SHB response PDU
Table 6 – SHB response PDU structure
Replace, in this subclause, the existing Table 6 by the following new table:
Table 6 – SHB response PDU structure
Octet offset Data field Description
0 to 2 PID Packet ID
3 Length Length of the complete packet in octets
4 to 5 SID 1 Safety ID of the sender
6 to 6+m-1 Consecutive number 1 Consecutive number for sequencing and
application monitoring where:
m = 1 for protocol version 1
m = 3 for protocol version 2
7+m to 10+m CRC 1 32 bit cyclic redundancy check covering data fields
PID, SID 1 and consecutive number 1
11+m to 12+m SID 2 Copy of SID 1
13+m to 13+2m-1 Consecutive number 2 Copy of consecutive number 1
14+2m to 17+2m CRC 2 32 bit cyclic redundancy check covering data fields
PID, SID 2 and consecutive number 2
NOTE m is the length of the consecutive number, depending on the protocol version (see 7.1.3.4).

7.1.3.4 SHB safety communication layer state
Table 7 – SHB safety communication layer state encoding
Replace, in this subclause, the existing Table 7 by the following new table:
Table 7 – SHB safety communication layer state encoding
Value Description Protocol
0x00 FS FAL is in BOOTUP state Version 1
0x04 FS FAL is in STOPPED state Version 1
0x05 FS FAL is in OPERATIONAL state Version 1
0x7F FS FAL is in PRE-OPERATIONAL state Version 1
0x10 FS FAL is in BOOTUP state Version 2
0x14 FS FAL is in STOPPED state Version 2
0x15 FS FAL is in OPERATIONAL state Version 2
0x1F FS FAL is in PRE-OPERATIONAL state Version 2

Add, in this subclause, after Table 7, as last paragraph:
The device shall support at least one protocol version. The FS FAL state shall be encoded
according to Table 7 depending on the used protocol version. It is recommended to support all
protocol versions.
7.1.3.5 SHB safety AP state
Replace, in the last sentence of this subclause: “116 octets” by “114 octets for protocol
version 2 or respectively 116 octets for protocol version 1”.

– 6 – IEC 61784-3-18:2011/AMD1:2016
 IEC 2016
7.1.3.7 SHB consecutive number
Replace, in this subclause: “an 8 bit” by “a”.
Add, at the end of this subclause:
The size of the consecutive number depends on the protocol version (see 7.1.3.4) and is
1 octet for protocol version 1 and 3 octets for protocol version 2.
7.1.3.8 SHB CRC
Delete, in this subclause, first paragraph: ”length, ”.
9 System requirements
9.7 Safety manual
Add, in this subclause, at the end of the list, the following new items:
• Probability of failure on demand PFH;
• Safety integrity level SIL;
• Proof test interval T (per IEC 61508-6) and/or Mission T (per ISO 13849-1);

1 m
• Supported protocol version(s) (see 7.1.3.4) unless only protocol version 1 is supported.

_____________
– 8 – IEC 61784-3-18:2011/AMD1:2016
 IEC 2016
AVANT-PROPOS
Le présent amendement a été établi par le sous-comité 65C: Réseaux de communication
industriels, du comité d'études 65 de l'IEC: Mesure, commande et automation dans les
processus industriels.
Le texte de cet amendement est issu des documents suivants:
FDIS Rapport de vote
65C/851/FDIS 65C/854/RVD
Le rapport de v
...