Industrial automation systems and integration - Distributed installation in industrial applications — Part 2: Hybrid communication bus

ISO 23570-2:2005 specifies the interconnection of elements in the control system of machine tools and similar large pieces of industrial automation. This specification includes cable types, sizes and sheath colours, connector types and contact assignments, and diagnostic functions appropriate to the sensors and actuators. ISO 23570-2:2005 specifies the cabling for fieldbus communications and the distribution of power to the modules on this communications bus.

Systèmes d'automatisation industrielle et intégration — Installation distribuée dans les applications industrielles — Partie 2: Bus de communication hybride

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Publication Date
01-Nov-2005
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9060 - Close of review
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02-Dec-2024
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INTERNATIONAL ISO
STANDARD 23570-2
First edition
2005-11-01


Industrial automation systems and
integration — Distributed installation in
industrial applications —
Part 2:
Hybrid communication bus
Systèmes d'automatisation industrielle et intégration — Installation
distribuée dans les applications industrielles —
Partie 2: Bus de communication hybride





Reference number
ISO 23570-2:2005(E)
©
ISO 2005

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ISO 23570-2:2005(E)
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ii © ISO 2005 – All rights reserved

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ISO 23570-2:2005(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Conformance. 1
3 Normative references . 1
4 Terms and definitions. 2
5 Requirements . 2
5.1 General. 2
5.2 Fibre optic based systems. 3
5.3 Twisted pair based systems. 4
5.4 Module . 5
5.5 Power supplies. 6
Annex A (informative) Reference colours. 7
Annex B (normative) Design specification for fibre optic hybrid connectors. 8
Annex C (normative) Design specification for twisted pair connectors . 21
Index. 27


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ISO 23570-2:2005(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 23570-2 was prepared by Technical Committee ISO/TC 184, Industrial automation systems and
integration, Subcommittee SC 1, Physical device control.
ISO 23570 consists of the following parts, under the general title Industrial automation systems and
integration — Distributed installation in industrial applications:
⎯ Part 1: Sensors and actuators
⎯ Part 2: Hybrid communication bus
⎯ Part 3: Power distribution bus
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ISO 23570-2:2005(E)
Introduction
Modern machine tools for the discrete parts manufacturing industry are complex systems, consisting of
subsystems for material preparation (metal removal, material forming, etc.), material handling, fixturing and
transfer lines for moving parts from one station to another. Each subsystem, in turn, is itself a complex system,
including many sensors, actuators and control elements that receive and transmit electric signals and/or
require electric power. To reduce down time in case of failure, most of them use cable assemblies for quick
replacement. Proper operation of the system as a whole requires co-ordination of the subsystems, which
requires more cables and connectors. As a consequence of this complexity, a large variety of cables and
connectors is required for the proper operation of such a machine tool. The increasing number of sensors,
actuators and control elements leads to an increasing variety of such cable assemblies. This variety results in
increased maintenance costs, due to complexity, large spare parts inventory and increased training costs for
maintenance personnel.

Key
1 motor with integrated electronics (e.g. a stepping motor)
2 fixed speed motor with separate motor controller
3 power distribution and control cabinet
4 fixed speed motor with attached motor controller
5 variable speed motor with integrated I/O module together with sensors and actuators
6 I/O module with a set of sensors
7 motor with integrated electronics (e.g. a stepping motor)
8 I/O module connected to a set of sensors and actuators including a hydraulic/pneumatic valve
9 remote control terminal
Figure 1 — System components addressed in ISO 23570
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ISO 23570-2:2005(E)
ISO 23570 prescribes a set of requirements for cables, connectors, and parameter selections within these
elements, which, if implemented completely, will greatly reduce the wiring complexity and maintenance cost of
such machine systems. Benefits will occur to the manufacturer of such systems in the form of decreased
complexity costs and to the user of such systems in the form of decreased down time because of decreased
parts inventory and simplified maintenance training.
The technology described in ISO 23570 may have applicability to other industries and processes; there is no
intention of restricting it to discrete parts manufacturing.
There are three main areas addressed within ISO 23570:
⎯ the interconnection of sensors and actuators to the system backbone;
⎯ a hybrid system backbone containing an information path (a fieldbus) and a source of power to the field
devices;
⎯ a power trunk capable of providing power to all the auxiliary motors in the system.
Large power devices, such as spindle motors for metal removal, are not covered by ISO 23570.
Machine tools described in ISO 23570 are subject to constraints imposed by national and international safety
standards. It is the intent of ISO 23570 to specify system elements that support the compliance with such
standards.
In Figure 1, the solid cable represents the power distribution bus providing three-phase a.c. power for electric
motors. The open cable represents a hybrid communication bus, containing both a fieldbus communication
channel and low voltage power.
The centre of Figure 1 shows (3) a control cabinet serving three sets of distribution buses. This box contains
the fieldbus communication front end, the low voltage power supplies and the three-phase power supplies.
To the left of the control cabinet are (1) a motor with integrated electronics and (2) a fixed speed motor with a
separate motor controller. Both units are linked to the control cabinet by both the communication bus and the
power distribution bus.
To the right of the control cabinet are (4) a fixed speed motor with an attached motor controller, (5) a variable
speed motor with an integrated I/O module connected to several sensors and actuators, and (6) another I/O
module connected to several sensors and actuators, including a hydraulic/pneumatic valve. The I/O module
(6) is linked to the control cabinet only by the hybrid communication bus.
In front of the control cabinet are three more units, (7) a motor with integrated electronics, (8) another I/O
module connected to several sensors and actuators including a hydraulic/pneumatic valve, and (9) a remote
control terminal.
Figure 1 is intended to illustrate the variety of interconnections possible using the elements of ISO 23570.
ISO 23570-1 provides the requirements for sensors, actuators, and I/O modules that support this system
requirement. This part of ISO 23570 provides the requirements for a shared communication and low voltage
power distribution system. ISO 23570-3 provides the requirements for distribution of power to the low power
motor systems.
While significant reduction in maintenance and operational costs may be achieved by adoption of individual
parts of ISO 23570, the greatest benefit will occur only if all parts are implemented.
This part of ISO 23570 provides the requirements for a shared communication and low voltage power
distribution system that support this system requirement.

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INTERNATIONAL STANDARD ISO 23570-2:2005(E)

Industrial automation systems and integration — Distributed
installation in industrial applications —
Part 2:
Hybrid communication bus
1 Scope
This part of ISO 23570 specifies the interconnection of elements in the control system of machine tools and
similar large pieces of industrial automation. This specification includes cable types, sizes and sheath colours,
connector types and contact assignments, and diagnostic functions appropriate to the sensors and actuators.
This part of ISO 23570 specifies the cabling for fieldbus communications and the distribution of power to the
modules on this communications bus.
This part of ISO 23570 does not address operation of such equipment with respect to safety issues.
Appropriate safety standards should be consulted for such requirements.
2 Conformance
Producers of modules, connectors, cable and cable assemblies may claim conformance to this part of
ISO 23570 if they meet the requirements of Clause 5, including either 5.2 or 5.3.
Producers of discrete part manufacturing equipment may claim conformance to this part of ISO 23570 if all the
components of the discrete part manufacturing equipment that are subject to the requirements of Clause 5
meet those requirements consistent with either 5.2 or 5.3.
3 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 60204-1:2000, Ed. 4.1, Safety of machinery — Electrical equipment of machines — Part 1: General
requirements
IEC 61076-2-101:2004, Connectors for electronic equipment — Part 2-101: Circular connectors — Detail
specification for circular connectors M8 with screw- or snap-locking, M12 with screw-locking for low voltage
applications
IEC 60529:2001 Ed. 2.0, Degrees of protection provided by enclosures (IP code)
IEC 60793-2-40:2002-03, Optical fibres — Part 2-40: Product specifications — Sectional specification for
category A4 multimode fibres
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ISO 23570-2:2005(E)
4 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
4.1
IP Code
coding system to indicate the degrees of protection provided by an enclosure against access to hazardous
parts, ingress of solid foreign objects, ingress of water and to give additional information in connection with
such protection
[IEC 60529]
4.2
module
network unit capable of communicating on the communication bus
4.3
network unit
unit present on the hybrid communication bus, which draws its power from one of the power circuits in that
bus
4.4
M12
connector meeting the requirements of IEC 61076-2-101, whose diameter is 12 mm
4.5
M12×1
M12 connector with a threaded coupling whose threads have a pitch of 1 mm
4.6
POF
plastic optical fibre
4.7
LED
light emitting diode
5 Requirements
5.1 General
This part of ISO 23570 specifies a hybrid cable system capable of supporting fieldbus communications and of
supplying auxiliary power to components on the bus. Two approaches to a communication channel are
provided, one based on fibre optics and the other based on twisted pair cabling.
This part of ISO 23570 also requires the system to support two independent 24 volt DC supply systems.
NOTE The intention behind specifying these dual power systems is to provide the system designer with a facility by
which safety related devices can be switched off independently of one another.
For the purposes of this part of ISO 23570, the two power supplies shall be identified as A and B. Power
supply A is the supply that is assumed to be unswitched; power supply B is the supply that is assumed to be
switched.
The network topology supported by this part of ISO 23570 is that of a daisy chained multi-drop system. These
network elements may be combined into a star topology; however, requirements on star topology networks
are outside the scope of this part of ISO 23570.
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ISO 23570-2:2005(E)
Each unit on the network shall be equipped with two connectors, one looking upstream to the power supplies,
and the other looking downstream.
All components specified by ISO 23570 shall be rated IP65 and IP67 as defined in IEC 60529.
All low voltage control cables that are not otherwise specified in ISO 23570 shall have a sheath colour of grey.
5.2 Fibre optic based systems
5.2.1 Cables and cable assemblies
Each cable shall contain two POF wave-guides, one for transmitting and one for receiving. The fibre optics
shall have nominal characteristics as given in IEC 60793-2-40:2002 for fibre type A4.
2 2
Each cable shall contain 4 copper wires, whose cross-sectional area is between 1,5 mm and 2,5 mm . The
cable sheath shall be resistant to all common industrial lubricants and coolants. The supplier of cable
assemblies shall provide a list of lubricants and coolants that are compatible with the cable. The sheath colour
shall be violet.
NOTE See Annex A for further elaboration of the colour specification.
A network connector meeting the requirements of 5.2.2 shall terminate each end of a cable assembly. One
end of the cable assembly shall have male connections for copper circuits; the other end shall have female
connections for the copper circuits. The connectors for the fibre optic channels shall be male at both ends of
the cable assembly.
Some uses of such cables may require constant flexing such as use in drag chain operations. The cable shall
be characterized as to whether it is suitable for such an operation.
5.2.2 Connectors
Connectors shall be polarized so as to avoid incorrect mating.
The contacts for the copper connectors shall have a current carrying capacity of 5 A or greater, per contact.
NOTE Annex B provides further specification for connectors satisfying these requirements.
Contacts 1 to 4 of the connector shall be used to transmit the power supply voltages as specified in Table 1.
Table 1 — Contact assignment for hybrid cable – fibre optic based
Contact Circuit
Contact 1 Power supply A + 24 Vdc
Contact 2 Power supply A 0 V
Contact 3 Power supply B 0 V
Contact 4 Power supply B + 24 Vdc
Contacts T-R Fibre optic channels
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ISO 23570-2:2005(E)
5.2.3 Network units
Each network unit shall be equipped with two fixed connectors, each meeting the requirements of 5.2.2. One
connector shall be male with respect to the copper circuits and the other connector shall be female with
respect to the copper circuits. Both connectors shall be female on the fibre optic circuits. Each connector shall
carry one receiver and one transmitter as active fibre optic elements.
NOTE The intention is that the network unit will be placed in the hybrid bus so that the power is fed to the male
copper circuit connector of the network unit. Strict adherence to the requirements for network units, for cable assemblies,
and for power supplies provided in this part of ISO 23570 will ensure that this occurs.
In some applications, it may be required that the network unit be able to be removed from the network for
servicing without interrupting the network or power service. To meet this requirement, the network unit shall be
composed of two separate components, one that may be removed and one that maintains the network
connection. The details of how this is to be accomplished are outside the scope of this part of ISO 23570.
Network units shall be characterized as to whether they are suitable for such an operation.
5.2.4 Network termination
The final node in the network shall include a cover on its downstream plug to meet environmental
requirements.
5.3 Twisted pair based systems
5.3.1 Cables and cable assemblies
Each cable shall contain a shielded twisted pair of wires for network communication. The wires shall be
appropriate for the bus technology being used. Each cable shall contain 4 copper wires whose cross-sectional
2 2
area is between 1,5 mm and 2,5 mm for carrying power.
The cable sheath shall be resistant to all common industrial lubricants and coolants. The supplier of cable
assemblies shall provide a list of lubricants and coolants that are compatible with the cable. The sheath colour
shall be violet.
NOTE See Annex A for further elaboration of the colour specification.
A network connector meeting the requirements of 5.3.2 shall terminate each end of a cable assembly. One
end of the cable assembly shall have male connections; the other
...

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