IEC 61784-5-3:2010

IEC 61784-5-3 ®
Edition 2.0 2010-07
INTERNATIONAL
STANDARD
colour
inside
Industrial communication networks – Profiles –
Part 5-3: Installation of fieldbuses – Installation profiles for CPF 3

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IEC 61784-5-3 ®
Edition 2.0 2010-07
INTERNATIONAL
STANDARD
colour
inside
Industrial communication networks – Profiles –
Part 5-3: Installation of fieldbuses – Installation profiles for CPF 3

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XD
ICS 25.040.40; 35.100.40 ISBN 978-2-88912-056-7
– 2 – 61784-5-3 © IEC:2010(E)
CONTENTS
FOREWORD.5
INTRODUCTION.7
1 Scope.8
2 Normative references .8
3 Terms, definitions and abbreviated terms .8
4 CPF 3: Overview of installation profiles .8
5 Installation profile conventions .9
6 Conformance to installation profiles.9
Annex A (normative) CP 3/1 (PROFIBUS) specific installation profile.11
Annex B (normative)  CP 3/2 (PROFIBUS) specific installation profile.43
Annex C (normative) CP 3/3, CP 3/4, CP 3/5, CP 3/6 (PROFINET) specific installation
profile .77
Bibliography.103

Figure 1 – Standards relationships.7
Figure A.1 – Recommended combination of shielding and earthing for CP 3/1
networks with RS 485-IS.24
Figure A.2 – Sub-D connector pin numberings (front view).29
Figure A.3 – 5-pin M-12 female socket.30
Figure A.4 – 5 pins M-12 male plug for CP 3/1.31
Figure A.5 – Test circuit A - resistance measurement of data line B and shield.36
Figure A.6 – Test circuit B - resistance measurement of data line A and shield.37
Figure A.7 – Test circuit C - resistance measurement of data line A, data line B, and
shield.37
Figure A.8 – Test circuit D - resistance measurement between data line A and B .38
Figure A.9 – Resistance measurement without 9-pin Sub-D plug .38
Figure A.10 – Loop core resistance (cable type A) .39
Figure A.11 – Action and resolution tree for measurement 1 (RS 485 and RS 485-IS) .40
Figure A.12 – Action and resolution tree for measurement 2 (RS 485 and RS 485-IS) .41
Figure A.13 – Action and resolution tree for measurement 3 (RS 485 and RS 485-IS) .41
Figure B.1 – Connection of CP 3/1 networks.46
Figure B.2 – Typical fieldbus architecture .48
Figure B.3 – Fieldbus with stations supplied by auxiliary power sources .49
Figure B.4 – Fieldbus model .51
Figure B.5 – Current modulation (Manchester II code) .52
Figure B.6 – Tree topology .53
Figure B.7 – Bus topology.54
Figure B.8 – Combination of the tree topology and the bus topology .54
Figure B.9 – Fieldbus extension.55
Figure B.10 – Recommended combination of shielding and earthing.67
Figure B.11 – Ideal combination of shielding and earthing .69
Figure B.12 – Capacitive earthing .70
Figure B.13 – Galvanic isolated field device.71

61784-5-3 © IEC:2010(E) – 3 –
Figure B.14 – Pin assignment of the male and female connectors IEC 60947-5-2 (A-
coding) .74
Figure C.1 – End-to-end link without interconnections.90
Figure C.2 – Assembled end-to-end link .90
Figure C.3 – Connectionless optical fibre link .91
Figure C.4 – Assembled optical fibre link .91
Figure C.5 – Shielded connectors for CP 3/3, CP 3/4, CP 3/5 and CP 3/6 fieldbus
networks .97
Figure C.6 – Pin-assignment for a straight cable.97

Table A.1 – Excerpt of MICE definition.13
Table A.2 – Basic network characteristics for balanced cabling not based on Ethernet
(ISO/IEC 8802-3) .15
Table A.3 – Network characteristics for optical fibre cabling.15
Table A.4 – Information relevant to copper cable: fixed cables.17
Table A.5 – Information relevant to optical fibre cables .18
Table A.6 – Connectors for copper cabling CPs not based on Ethernet.19
Table A.7 – Optical fibre connecting hardware .19
Table A.8 – Relationship between FOC and fibre types (CP 3/1).20
Table A.9 – Parameters for balanced cables.26
Table A.10 – Parameters for silica optical fibre cables .27
Table A.11 – Parameters for POF optical fibre cables .27
Table A.12 – Parameters for hard clad silica optical fibre cables.27
Table A.13 – Use of 9 pin Sub-D connector pins (RS 485) .29
Table A.14 – Use of 9 pin Sub-D connector pins (RS 485-IS).30
Table A.15 – Use of M12 connector pins (RS 485).31
Table A.16 – Use of M12 connector pins (RS 485-IS) .32
Table A.17 – Maximum fibre channel attenuation for CP 3/1 (PROFIBUS) .42
Table B.1 – Valid parameter range of the FISCO model for use as EEx ib IIC / IIB.50
Table B.2 – Valid parameter range of the FISCO model for use as EEx ia IIC .50
Table B.3 – Power supply (operational values) .56
Table B.4 – Line lengths which can be achieved .56
Table B.5 – Limit values for distortion, reflection and signal delay.57
Table B.6 – Recommended maximum cable lengths including spurs .57
Table B.7 – Recommended length of the spurs .57
Table B.8 – Maximum length of the splices .58
Table B.9 – Information relevant to copper cable: fixed cables.59
Table B.10 – Safety limit values for the fieldbus cable .60
Table B.11 – Connectors for copper cabling CPs not based on Ethernet.61
Table B.12 – Mixing devices from different categories .63
Table B.13 – Electrical characteristics of fieldbus interfaces .64
Table B.14 – Recommended data sheet specifications for CP 3/2 devices .65
Table B.15 – Parameters for balanced cables .73
Table B.16 – Contact assignments for the external connector for harsh industrial
environments .74

– 4 – 61784-5-3 © IEC:2010(E)
Table C.1 – General transmission media selection information .79
Table C.2 – Network characteristics for balanced cabling based on Ethernet
(ISO/IEC 8802-3) .80
Table C.3 – Network characteristics for optical fibre cabling .80
Table C.4 – Information relevant to copper cable: CP 3/3, CP 3/4, CP 3/5 and CP 3/6
type A fixed cables .82
Table C.5 – Information relevant to copper cable: CP 3/3, CP 3/4, CP 3/5 and CP 3/6
type B flexible cables .82
Table C.6 – Information relevant to copper cable: CP 3/3, CP 3/4, CP 3/5 and CP 3/6
type C special cables.83
Table C.7 – Information relevant to optical fibre cables.83
Table C.8 – Requirements for plastic and hard clad silica optical fibre cables .84
Table C.9 – Requirements for glass multimode optical fibre cables .85
Table C.10 – Requirements for glass singlemode optical fibre cables .86
Table C.11 – Information relevant to hybrid cables (application type B) .87
Table C.12 – Information relevant to hybrid cables (application type C) .87
Table C.13 – Connectors for balanced cabling CPs based on Ethernet .88
Table C.14 – Optical fibre connecting hardware .89
Table C.15 – Relationship between FOC and fibre types (CP 3/3, CP 3/4, CP 3/5,
CP3/6) .89
Table C.16 – Typical fibre channels common for industrial applications. .92
Table C.17 – Parameters for balanced cables.95
Table C.18 – Parameters for silica optical fibre cables.96
Table C.19 – Parameters for POF optical fibre cables.96
Table C.20 – Parameters for hard clad silica optical fibre cables .96
Table C.21 – Colour coding for CP 3/3, CP 3/4, CP 3/5 and CP 3/6 connectors .97
Table C.22 – Maximum fibre channel attenuation for CP 3/3, CP 3/4, CP 3/5 and
CP 3/6 (PROFINET).101

61784-5-3 © IEC:2010(E) – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
PROFILES –
Part 5-3: Installation of fieldbuses –
Installation profiles for CPF 3

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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6) All users should ensure that they have the latest edition of this publication.
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61784-5-3 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial-process measurement, control and
automation.
This second edition cancels and replaces the first edition published in 2007. This edition
constitutes a technical revision.
This edition includes the technical changes of the corrigendum for the first edition in 2008 and
an addition concerning transmission performance measurement (see Annex C.6.3.2.1.2).
This standard is to be used in conjunction with IEC 61918:2010.

– 6 – 61784-5-3 © IEC:2010(E)
The text of this standard is based on the following documents:
FDIS Report on voting
65C/602/FDIS 65C/616/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 61784-5 series, published under the general title Industrial
communication networks – Profiles – Installation of fieldbuses, can be found on the IEC
website.
The committee has decided that the contents of this 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.
A bilingual version of this publication may be issued at a later date.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
61784-5-3 © IEC:2010(E) – 7 –
INTRODUCTION
This International Standard is one of a series produced to facilitate the use of communication
networks in industrial control systems.
IEC 61918:2010 provides the common requirements for the installation of communication
networks in industrial control systems. This installation profile standard provides the
installation profiles of the communication profiles (CP) of a specific communication profile
family (CPF) by stating which requirements of IEC 61918 fully apply and, where necessary, by
supplementing, modifying, or replacing the other requirements (see Figure 1).
For general background on fieldbuses, their profiles, and relationship between the installation
profiles specified in this standard, see IEC/TR 61158-1.
Each CP installation profile is specified in a separate annex of this standard. Each annex is
structured exactly as the reference standard IEC 61918 for the benefit of the persons
representing the roles in the fieldbus installation process as defined in IEC 61918 (planner,
installer, verification personnel, validation personnel, maintenance personnel, administration
personnel). By reading the installation profile in conjunction with IEC 61918, these persons
immediately know which requirements are common for the installation of all CPs and which
are modified or replaced. The conventions used to draft this standard are defined in Clause 5.
The provision of the installation profiles in one standard for each CPF (for example
IEC 61784-5-3 for CPF 3), allows readers to work with standards of a convenient size.

PLANNING
DESIGN AND
INSTALLATION
Offices
GENERIC
OFFICE PREMISES ISO/IEC 11801
Annex
CABLING
Home
HOMES ISO/IEC 15018
Annex
ISO/IEC Data centre
DATA CENTRES ISO/IEC 24764
14763-2 Annex
BETWEEN
Industrial
AUTOMATION ISO/IEC 24702
Annex
ISLANDS
BETWEEN
AUTOMATION
Installation
INDUSTRIAL PREMISES IEC 61158
IEC 61918
ISLANDS
Profiles
series
IEC 61784-5 series
and
(Common
(Selection +
WITHIN
requirements)
IEC 61784-1, -2
Add/Repl/Mod)
AUTOMATION
ISLANDS
Com m on structure
APPLICATION-SPECIFIC
CABLING
Figure 1 – Standards relationships

– 8 – 61784-5-3 © IEC:2010(E)
INDUSTRIAL COMMUNICATION NETWORKS –
PROFILES –
Part 5-3: Installation of fieldbuses –
Installation profiles for CPF 3

1 Scope
This part of IEC 61784 specifies the installation profiles for CPF 3 (PROFIBUS/PROFINET) .
The installation profiles are specified in the annexes. These annexes are read in conjunction
with IEC 61918:2010.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 61918:2010, Industrial communication networks – Installation of communication networks
in industrial premises
The normative references of IEC 61918:2010, Clause 2, apply. For profile specific normative
references, see Clause(s) A.2, B.2 and C.2.
3 Terms, definitions and abbreviated terms
For the purposes of this document, the terms, definitions and abbreviated terms of
IEC 61918:2010, Clause 3, apply. For profile specific terms, definitions and abbreviated terms
see Clause(s) A.3, B.3 and C.3.
4 CPF 3: Overview of installation profiles
CPF 3 consists of six communication profiles as specified in IEC 61784-1 and IEC 61784-2.
The installation requirements for CP 3/1 (PROFIBUS with physical layer according to RS 485,
RS 485-IS, and fibre) are specified in Annex A.
The installation requirements for CP 3/2 (PROFIBUS with physical layer according to MBP,
MBP-IS, MBP-LP) are specified in Annex B.
The installation requirements for CP 3/3, CP 3/4, CP 3/5, and CP 3/6 (PROFINET) are
specified in Annex C.
___________
PROFIBUS and PROFINET are trade names of the non-profit organization PROFIBUS Nutzerorganisation e.V.
(PNO). This information is given for the convenience of users of this International Standard and does not
constitute an endorsement by IEC of the trade names holder or any of its products. Compliance to this profile
does not require use of the trade names. Use of the trade names PROFIBUS and PROFINET requires
permission of the trade name holder.

61784-5-3 © IEC:2010(E) – 9 –
5 Installation profile conventions
The numbering of the clauses and subclauses in the annexes of this standard corresponds to
the numbering of IEC 61918 main clauses and subclauses.
The annex clauses and subclauses of this standard supplement, modify, or replace the
respective clauses and subclauses in IEC 61918.
Where there is no corresponding subclause of IEC 61918 in the normative annexes in this
standard, the subclause of IEC 61918 applies without modification.
The annex heading letter represents the installation profile assigned in Clause 4. The annex
(sub)clause numbering following the annex letter shall represent the corresponding
(sub)clause numbering of IEC 61918.
EXAMPLE “Annex B.4.4” in IEC 61784-5-3 means that CP 3/2 specifies the Subclause 4.4 of IEC 61918.
All main clauses of IEC 61918 are cited and apply in full unless otherwise stated in each
normative installation profile annex.
If all subclauses of a (sub)clause are omitted, then the corresponding IEC 61918 (sub)clause applies.
If in a (sub)clause it is written “Not applicable”, then the corresponding IEC 61918 (sub)clause
does not apply.
If in a (sub)clause it is written “Addition”, then the corresponding IEC 61918 (sub)clause
applies with the additions written in the profile.
If in a (sub)clause it is written “Replacement”, then the text provided in the profile replaces the
text of the corresponding IEC 61918 (sub)clause.
NOTE A replacement can also comprise additions.
If in a (sub)clause it is written “Modification”, then the corresponding IEC 61918 (sub)clause
applies with the modifications written in the profile.
If all (sub)clauses of a (sub)clause are omitted but in this (sub)clause it is written
“(Sub)clause x has addition” (or “replacement”, or "modification") or “(Sub)clause is not
applicable.”, then (sub)clause x becomes valid as declared and all the other corresponding
IEC 61918 (sub)clauses apply.
6 Conformance to installation profiles
Each installation profile within this standard includes part of IEC 61918:2010. It may also
include defined additional specifications.
A statement of compliance to an installation profile of this standard shall be stated as either
Compliance to IEC 61784-5-3:2010 for CP 3/m or
Compliance to IEC 61784-5-3 (Ed.2.0) for CP 3/m
where the name within the angle brackets < > is optional and the angle brackets are not to be
included. The m within CP 3/m shall be replaced by the profile number 1 to 6.
___________
In accordance with ISO/IEC Directives
The date should not be used when the edition number is used.

– 10 – 61784-5-3 © IEC:2010(E)
NOTE The name may be the name of the profile, for example PROFIBUS or PROFINET.
If the name is a trade name then the permission of the trade name holder shall be required.
Product standards shall not include any conformity assessment aspects (including quality
management provisions), neither normative nor informative, other than provisions for product
testing (evaluation and examination).

61784-5-3 © IEC:2010(E) – 11 –
Annex A
(normative)
CP 3/1 (PROFIBUS) specific installation profile

A.1 Installation profile scope
Addition:
This standard specifies the installation profile for Communication Profile CP 3/1 (PROFIBUS
with a physical layer according to RS 485, RS 485-IS, and fibre). The CP 3/1 is specified in
IEC 61784-1.
A.2 Normative references
Addition:
IEC 60079-11:2006, Explosive Athmospheres – Part 11: Equipment protection by intrinsic
safety "I"
IEC 60512-6-3, Connectors for electronic equipment – Tests and measurements – Part 6-3:
Dynamic stress tests; Test 6c: Shock
IEC 60512-6-4, Connectors for electronic equipment – Tests and measurements – Part 6-4:
Dynamic stress tests; Test 6d: Vibration (sinusoidal)
IEC 61508 (all parts), Functional safety of electrical/electronic/programmable electronic
safety-related systems
ANSI TIA/EIA-485-A, Electrical Characteristics of Generators and Receivers for Use in
Balanced Digital Multipoint Systems
A.3 Installation profile terms, definitions, and abbreviated terms
A.3.1 Terms and definitions
Addition:
6.1
hazard
potential source of harm
NOTE The term includes danger to persons arising within a short time scale (for example fire and explosion) and
also those that have a long term effect on a person’s health (for example release of a toxic substance).
[IEC 61508-4:2010 , 3.1.2]
6.2
intrinsic safety “i”
type of protection based on the restriction of electrical energy within apparatus and of
interconnecting wiring exposed to the potentially explosive atmosphere to a level below that
which can cause ignition by either sparking or heating effects
___________
To be published.
– 12 – 61784-5-3 © IEC:2010(E)
[IEC 60079-11:2006, 3.1.1]
NOTE No single device or wiring is intrinsically safe by itself (except for battery-operated self-contained
apparatus such as portable pagers, transceivers, gas detectors, etc., which are specifically designed as
intrinsically safe self-contained devices) but is intrinsically safe only when employed as part of a properly designed
intrinsically safe system.
A.3.2 Abbreviated terms
Addition:
MAU Medium attachment unit
PELV Protective Extra Low Voltage
PNO PROFIBUS Nutzer Organisation (a non profit user organisation)
RS 485 MAU according to ANSI TIA/EIA-485-A
RS 485-IS MAU according to ANSI TIA/EIA-485-A and applicable to IS
SELV Safety Extra Low Voltage
TN-S Coded type of system earthing according to IEC 60364-1, 312.2

A.3.3 Conventions for installation profiles
Not applicable.
A.4 Installation planning
A.4.1 Introduction
Subclause 4.1.2 has addition:
Generic cabling in accordance with ISO/IEC 24702 is not suitable for the cabling of CP 3/1
networks.
CP 3/1 networks only can be connected to the generic cabling via converter/adapter as
specified in IEC 61918:2010, 4.1.2.
A.4.2 Planning requirements
A.4.2.1 Safety
Subclause 4.2.1.3 has addition:
NOTE Each and every device on CP 3/1 networks (standard and safety) should provide a test certificate issued
by PROFIBUS International (more information available by ) based on IEC 61158 or at least
provide a corresponding manufacturers declaration stating compliance with CP 3/1 specification.
Each and every safety device shall comply with IEC 61508 series and other related standards
if applicable.
The 24V power supplies in use shall be one-error proof and provide SELV/PELV only.
National regulations shall be considered.
EXAMPLE In the United States of America the power supplies provide a current limitation of 8A according to
UL508C.
No spurs or branch lines are permitted in a CP 3/1 network for safety applications.
Effective cable shielding especially after bending the cable or after changing connectors shall
be ensured. In case of doubt, a more flexible and robust cable type should be used.

61784-5-3 © IEC:2010(E) – 13 –
Sub-D connectors shall have multi contact features at the connector housing in order to
provide an optimal contact between the cable shield, the cable connector and its counterpart
at the CP 3/1 device. Care shall be taken to achieve a good (low impedance) contact between
the cable shield and connector housing.
For connections of CP 3/1 devices with M12 interface only M12 connectors that guarantee a
good (low impedance) contact between cable shield and connector housing are permitted.
Cable shield shall not be connected to the connector pin 5.
A cabinet of protection class IP54 (dust, shower water) shall be used for safety devices such
as drives with integrated safety that are offering a lower protection class such as IP20.
Cabinets with a lower protection class may only be used if safety devices explicitly permit
other environments according to the manufacturer's information (for example heat problems).
A.4.2.2 Security
A.4.2.3 Environmental considerations and EMC
A.4.2.3.1 Description methodology
Modification:
The MICE description methodology shown in IEC 61918:2010 is both a rather comprehensive
and complex approach but nevertheless does not describe all possible environments. Where
an environment exists that cannot be mapped in to the MICE tables, the user shall determine
suitability of the components for the targeted environment through agreements with the
component providers or additional mitigation techniques.
To make fieldbus installation work more easily for CP 3/1 fieldbus networks the MICE table is
condensed into the two basic environments inside and outside data cabinets.
NOTE CP 3/1 products should at least meet the MICE parameters of Table A.1.
Table A.1 – Excerpt of MICE definition
Inside enclosure Outside enclosure
Mechanical
a IEC 60512-6-3 IEC 60512-6-3
Shock/bump
20 g / 11 ms 20 g / 11 ms
Peak acceleration
3 per axis in both directions 3 per axis in both directions
Vibration IEC 60512-6-4 IEC 60512-6-4
10 Hz - 500 Hz 0,35 mm or 5g 0,35 mm or 5 g
Ingress
IP protection class IP20 IP65 / IP67
Particulate ingress (dia 12,5 mm
50 μm
min)
Immersion None intermittent liquid jet

≤12,5 l/min
≥ 6,5 mm jet
> 2,5 m distance
and immersion (≤1 m for ≤30 min)
Climatic and chemical
Ambient temperature 0 °C to +60 °C -20 °C to +70 °C

– 14 – 61784-5-3 © IEC:2010(E)
Inside enclosure Outside enclosure
Electromagnetic
Transfer impedance See components selection
NOTE Additional parameters out of the MICE definition in IEC 61918:2010, Annex B, may be
observed depending on the application. The different products offered for these environments
typically meet the requirements of the respective IEC standards. Additional products are offered for
special applications (e.g. drag chain, festoon, robots, etc) and the recommendations for cable routing
should be followed.
a
Bump: the repetitive nature of the shock experienced by the channel shall be taken into account.

A.4.2.3.2 Use of the described environment to produce a bill of material
Addition:
Manufacturers mark their products designed for CP 3/1 networks in a specific way. Only these
marked products shall be used and be mentioned on the bill of material.
The planner shall take into account the mating interface of devices to be connected to the
fieldbus network.
A.4.2.4 Specific requirements for generic cabling in accordance with ISO/IEC 24702
A.4.3 Network capabilities
A.4.3.1 Network topology
A.4.3.1.1 Common description
A.4.3.1.2 Basic physical topologies for passive networks
Modification:
For CP 3/1 passive networks only the bus topology is permitted.
A.4.3.1.3 Basic physical topologies for active networks
A.4.3.1.4 Combination of basic topologies
A.4.3.1.5 Specific physical topology requirements for CPs
Addition:
For CP 3/1 networks with data transmission rate of 12 Mbit/s spurs shall not be used.
For CP 3/1 networks with data transmission rate of 1,5 Mbit/s spurs should not be used.
Bus repeaters of different manufacturers should not be mixed due to their different
optimisation strategies. The number of repeaters permitted in a link between any two devices
is up to manufacturers’ specification.

61784-5-3 © IEC:2010(E) – 15 –
A.4.3.1.6 Specific requirements for generic cabling in accordance with ISO/IEC
A.4.3.2 Network characteristics
A.4.3.2.1 General
A.4.3.2.2 Network characteristics for balanced cabling not based on Ethernet
Replacement:
Table A.2 provides values based on the template given in IEC 61918:2010, Table 1.
Table A.2 – Basic network characteristics for balanced
cabling not based on Ethernet (ISO/IEC 8802-3)
Characteristic CP 3/1 (PROFIBUS)
Basic transmission technology RS 485 RS 485-IS
Length / transmission speed Segment length
m
9,6 kbit/s – 93,75 kbit/s 1 200 1 200
187,5 kbit/s 1 000 1 000
500 kbit/s 400 400
1,5 Mbit/s 200 200
3 – 6 – 12 Mbit/s 100 Not applicable
Maximum capacity Maximum No.
Devices / segment 32 32
a125 125
Number of devices / network
a
Limited by addressing scheme.
A.4.3.2.3 Network characteristics for balanced cabling based on Ethernet
Not applicable.
A.4.3.2.4 Network characteristics for optical fibre cabling
Replacement:
Table A.3 provides values based on the template given in IEC 61918:2010, Table 3.
Table A.3 – Network characteristics for optical fibre cabling
Optical fibre type Description
Single mode silica Standard 1 320 nm
Attenuation coefficient at λ
≤ 1 dB/km
Bandwidth or equivalent at
1 200 MHz × km
λ
Alternative description
9 … 10
Mode field diameter (μm)
Outer diameter (μm)
Minimum length (m) 0
Maximum length (m) 15 000
Multimode silica Standard 850 nm

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Optical fibre type Description
Attenuation coefficient at λ
≤ 2,7 dB/km
Modal bandwidth 600
(MHz × km) at λ
Alternative description
Core diameter (μm)
Outer diameter (μm)
NA
0,20 ± 0,02
Minimum length (m) 0
Maximum length (m) 3 000
Multimode silica Standard 850 nm
Attenuation coefficient at λ
≤ 3,5 dB/km
Modal bandwidth 600
(MHz × km) at λ
Alternative description
62,5
Core diameter (μm)
Outer diameter (μm)
NA
0,275 ± 0,015
Minimum length (m) 0
Maximum length (m) 3 000
POF Standard 660 nm
Attenuation coefficient at λ
≤ 230 dB/km
Modal bandwidth
10 MHz × 100 m
(MHz × km) at λ
Alternative description
Core diameter (μm)
1 000
Outer diameter (μm)
NA
0,50 ± 0,03
Minimum length (m) 0
Maximum length (m) 80
Hard clad silica Standard 660 nm
Attenuation coefficient at λ
≤ 10 dB/km
Modal bandwidth 17
(MHz × km) at λ
Alternative description
Core diameter (μm) 200
Outer diameter (μm) 230
NA
0,37 ± 0,04
Minimum length (m) 0
Maximum length (m) 400
A.4.3.2.5 Specific network characteristics
Not applicable.
61784-5-3 © IEC:2010(E) – 17 –
A.4.3.2.6 Specific requirements for generic cabling in accordance with
ISO/IEC 24702
A.4.4 Selection and use of cabling components
A.4.4.1 Cable selection
A.4.4.1.1 Common description
Addition:
Generic cabling in accordance with ISO/IEC 24702 is not suitable for the cabling of CP 3/1
networks.
CP 3/1 networks only can be connected to the generic cabling via converter/adapter as
specified in IEC 61918:2010, 4.1.2.
A.4.4.1.2 Copper cables
A.4.4.1.2.1 Balanced cables for non Ethernet based CPs
Not applicable.
A.4.4.1.2.2 Copper cables for non Ethernet based CPs
Addition:
Unshielded cables shall not be used with CP 3/1 networks.
Replacement:
Table A.4 provides values based on the template given in IEC 61918:2010, Table 4.
Table A.4 – Information relevant to copper cable: fixed cables
a
Characteristic CP 3/1 (PROFIBUS RS 485) CP 3/1 (PROFIBUS RS 485-IS)
Nominal impedance of cable
135 – 165 Ω; f = 3 MHz - 20 MHz
(tolerance)
Balanced or unbalanced Balanced
DCR of conductors
< 55 Ω/km
DCR of shield Not defined
Number of conductors 2
Shielding Mandatory
Colour code for conductor A = green; B = red
b
Jacket colour requirements Violet
Light blue
Jacket material Application dependant
Resistance to harsh Cable types for different applications available
environment (e.g. UV, oil
resist, LS0H)
Agency ratings Cable types with different ratings available
Conductor cross-sectional
c
≥ 0,34 mm²
≥ 0,34 mm²
area
Capacitance
< 30 pF/m
d
L/R ratio (μH / Ω) Not specified
≤ 15
– 18 – 61784-5-3 © IEC:2010(E)
a
Characteristic CP 3/1 (PROFIBUS RS 485) CP 3/1 (PROFIBUS RS 485-IS)
a
Cable shall be in accordance with IEC 60079-14.
b
If a colour is used for identification.
c
If a fine stranded conductor is used: 0,1 mm is the minimum value required for the diameter of a
single wire.
d
Shall be applied for the lowest ambient temperature of the bus cable.

A.4.4.1.3 Cables for wireless installation
Not applicable.
A.4.4.1.4 Optical fibre cables
Replacement:
Table A.5 provides values based on the template given in IEC 61918:2010, Table 6.
Table A.5 – Information relevant to optical fibre cables
Characteristics for CP 3/1
9.10/125 μm 50/125 μm 62,5/125 μm 980/1 000 μm 200/230 μm
single mode multimode multimode step index step index
silica silica silica POF hard clad
silica
Attenuation per km (660 nm) — — —
≤ 230 ≤ 10
Attenuation per km (850 nm) — — —
≤ 2,7 ≤ 3,5
Attenuation per km (1 320 nm) — — — —
≤ 1,0
Number of optical fibres 2 2 2 2 2
Connector type (e.g. duplex or BFOC/2,5 BFOC/2,5 BFOC/2,5 BFOC/2,5 BFOC/2,5
simplex)
others others
Jacket colour requirements None None None None None
Jacket material Several Several Several Several Several
Resistance to harsh Yes Yes Yes Yes Yes
environment (e.g. UV, oil
resist, LS0H)
Breakout Yes Yes Yes Yes Yes
A.4.4.1.5 Special purpose balanced and optical fibre cables
A.4.4.1.6 Specific cable requirements for CPs
Addition:
Data communication part of hybrid cables complies with IEC 61918:2010, 4.4.1.2.2. In
addition hybrid cables shall provide 4 × 1,5 mm² copper wires for power supply.
A.4.4.1.7 Specific requirements for generic cabling in accordance with
ISO/IEC 24702
A.4.4.2 Connecting hardware selection
A.4.4.2.1 Common description
Modification:
61784-5-3 © IEC:2010(E) – 19 –
Applies with consideration of A.4.2.3.1.
A.4.4.2.2 Connecting hardware for balanced cabling CPs based on Ethernet
Not applicable.
A.4.4.2.3 Connecting hardware for copper cabling CPs not based on Ethernet
Replacement:
Table A.6 provides values based on the template given in IEC 61918:2010, Table 8.
Table A.6 – Connectors for copper cabling CPs not based on Ethernet
IEC
60807-2 IEC 60947-5-2
IEC 61169 ANSI/NFPA
Others
or or
-8 T3.5.29 R1-2003
IEC IEC 61076-2-101
60807-3
M12-5 7/8-16
M12-5 with M12-n with Coaxial Open Terminal
Sub-D with M 18 UN-2B Others
B-coding X-coding (BNC) style block
A-coding THD
CP Hybrid
9 pin No Yes No No No No No Yes
3/1 style
NOTE For M12-5 connectors, there are many applications using these connectors that are not compatible and when mixed
may cause damage to the applications.

A.4.4.2.4 Connecting hardware requirements for wireless installation
Not applicable.
A.4.4.2.5 Connecting hardware for optical fibre cabling
Replacement:
Table A.7 provides values based on the template given in IEC 61918:2010, Table 9.
Table A.7 – Optical fibre connecting hardware

IEC 61754-2 IEC 61754-4 IEC 61754-2
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