Contemporary Control Systems TD960801-0MC Manual de usuario
EXTEND-A-BUSfor
A Line of Fieldbus Extenders for DeviceNet
User Manual
#TD960801-0MC
Trademarks
Contemporary Controls, ARC Control, ARC DETECT and
EXTEND-A-BUS are trademarks or registered trademarks of
Contemporary Control Systems, Inc. ARCNET is a registered
trademark of Datapoint Corporation. Other product names may be
trademarks or registered trademarks of their respective companies.
TD960801-0MC Revised 07-16-02
Copyright
© Copyright April 1999-2002 by Contemporary Control Systems,
Inc. All rights reserved. No part of this publication may be
reproduced, transmitted, transcribed, stored in a retrieval system, or
translated into any language or computer language, in any form or
by any means, electronic, mechanical, magnetic, optical, chemical,
manual, or otherwise, without the prior written permission of:
Contemporary Control Systems, Inc.
2431 Curtiss Street
Downers Grove, Illinois 60515 USA
Tel: +1-630-963-7070
Fax: +1-630-963-0109
E-mail: [email protected]
WWW: http://www.ccontrols.com
Contemporary Controls Ltd
Sovereign Court Two
University of Warwick Science Park
Sir William Lyons Road
Coventry CV4 7EZ UK
Tel: +44 (0)24 7641 3786
Fax: +44 (0)24 7641 3923
E-mail: [email protected]
Disclaimer
Contemporary Control Systems, Inc. reserves the right to make
changes in the specifications of the product described within this
manual at any time without notice and without obligation of
Contemporary Control Systems, Inc. to notify any person of such
revision or change.
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Contents
Chapter1 Introduction......................................................... 1
1.1 Description................................................ 1
1.2 Features..................................................... 2
1.3 Specifications ............................................ 2
1.4 Port Specifications .................................... 3
1.5 Ordering Information ................................ 4
Chapter2 Installation........................................................... 5
2.1 Introduction ............................................... 5
2.2 Electromagnetic Compliance..................... 5
2.3 Mounting the EXTEND-A-BUS ............... 6
2.4 Powering the EXTEND-A-BUS ............... 6
2.5 Connecting to the CAN Port ..................... 9
2.6 Connecting to the Backbone Port ............ 12
Chapter3 Operation .......................................................... 19
3.1 CAN Communications ............................ 19
3.2 Theory of Operation................................ 20
3.3 System Considerations ............................ 23
3.4 LED Indicators........................................ 25
Chapter 4 Service ............................................................... 27
Warranty............................................................. 27
Technical Support............................................... 28
Warranty Repair ................................................. 28
Non-Warranty Repair ......................................... 29
Returning Products for Repair............................ 29
Appendices Appendix A—PermissibleSegment Lengths ...... 31
Appendix B—Declaration of Conformity........... 34
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List of Figures
Figure 2-1 DC Powered ........................................................ 7
Figure 2-2 Redundant DC Powered...................................... 8
Figure 2-3 AC Powered ........................................................ 8
Figure 2-4 AC Powered with Battery Backup ...................... 9
Figure 2-5 CAN Port Connector Assignments ................... 10
Figure 2-6 Data Rate Switch .............................................. 11
Figure 2-7 Appropriate terminators are required
at the ends of both the coaxial cable backbone
and DeviceNet subnets ...................................... 13
Figure 2-8 A maximum of eight EXTEND-A-BUSes can .....
occupy one coaxial backbone segment before an ..
active hub is required ........................................ 14
Figure 2-9 A 62.5/125 µm duplex fiber optic cable is
used on the -FOG model up to a maximum of
1830 meters....................................................... 15
Figure 2-10 By using two AI3-CXS hubs, a
distributed star topology is achieved ................. 17
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1Introduction
1.1 Description
The EXTEND-A-BUS for DeviceNet series of fieldbus
extenders enable the geographic expansion of CAN-based
device networks such as DeviceNet by linking individual
DeviceNet subnets together into a single larger network.
The medium arbitration method used by DeviceNet is intolerant
of excessive signal delay. Since cable length introduces delay,
DeviceNet networks tend to be distance limited. Repeaters are
ineffective in extending distances since they introduce additional
delay. On the other hand, fieldbus extenders like EXTEND-A-
BUS solve the problem by segmenting a single DeviceNet
network into manageable subnets.
EXTEND-A-BUS interconnects two physically separated but
similar networks using a different interconnecting medium.
Thus, a pair is required to interconnect two networks (or
subnets) the way two modems are used on leased phone lines.
Utilizing ARCNET as the high-speed deterministic
interconnecting medium, the EXTEND-A-BUS captures
DeviceNet traffic and replicates it to the receiving device. The
receiving device removes DeviceNet data and rebroadcasts the
data to its attached DeviceNet subnet. EXTEND-A-BUS does
not filter out DeviceNet identifiers or MAC addresses, so
DeviceNet messages are rebroadcast unmodified.
Application Information
Each EXTEND-A-BUS creates a DeviceNet subnet and a
minimum of two EXTEND-A-BUSes is required to establish a
network. The data rate on each subnet can be different from the
other subnets. DeviceNet identifiers or MAC ID checks are
replicated on all subnets. EXTEND-A-BUS pairs are best
viewed as an extension cord. Each EXTEND-A-BUS does not
consume a permanent MAC ID and, therefore, is transparent to
thenetwork.
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Extending the Interconnecting Medium or Backbone
The backbone side of the EXTEND-A-BUS must comply with
standard ARCNET cabling rules. Companion AI ARCNET
active hubs are available for extending the backbone cabling up
to 6 km using coaxial cabling and ten active hubs. When using
a fiber optic backbone, a maximum of 4.8 km can be achieved
requiring two active hubs. Hubs are cascaded to reach the
required distance.
1.2 Features
•Extends the length of DeviceNet networks up to 6 km
•Fully DeviceNet compliant
•Fiber optic or coaxial cabling
•Star, bus or distributed star topology
•Variable data rate up to 500 kbps
•Low voltage AC or DC powered
•Panel-mountenclosure
1.3 Specifications
Electrical DC AC
Input voltage: 10–36 volts 8–24 volts
Input power: 4 watts 4VA
Inputfrequency: N/A 47-63 Hz
Power Options
– DC powered
– Redundant powered
– AC powered
– AC powered with battery backup
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Environmental
Operating: 0°C to 60°C
Storage: -40°C to +85°C
Functional
Data latency: 1.2 ms typical per EXTEND-A-BUS pair
Regulatory Compliance
FCC Part 15 Class A
CE Mark
1.4 Port Specifications
CAN Port
Compliance DeviceNet
Volume I, Release 2.0
Data Rate 125 kbps, 250 kbps, 500 kbps select-
able or
Autobaud 125 kbps, 250 kbps, 500 kbps
LEDs CAN status:
Module status/network status
Transceivers Optically isolated 82C251
Cable DeviceNetThick
Connectors 5 position Open-pluggable
Maximum segment 125 kbps: 500 meters (1640 ft)
or subnet distance 250 kbps: 250 meters (820 ft)
500 kbps: 100 meters (328 ft)
Maximum number
of nodes per segment 64
Terminating resistor 121 ohms
BackbonePort
Compliance ARCNET
ANSI/ATA 878.1
Data Rate 2.5 Mbps
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LEDs Link status:
Reconfiguration status/activity status
Transceivers -CXBmodel: transformer coupled
-FOGmodel: 850 nm duplex
fiber optic
Cable -CXBmodel: RG-62/u coaxial
-FOGmodel: 62.5/125 µm duplex
fiber optic
Connectors -CXBmodel: BNC
-FOGmodel: ST
Maximum segment -CXBmodel: 305 meters (1000 ft)
or subnet distance -FOG model: 1830 meters (6000 ft)
(optical power
budget 10.4dB)
Maximum number -CXBmodel: 8
of nodes per segment -FOGmodel: N/A
Terminating resistor -CXB model: 93 ohms
-FOGmodel: N/A
1.5 Ordering Information
The EXTEND-A-BUS series is available in several
configurations depending upon the application and cable media
supported.
EXTEND-A-BUSes:
EB/DNET-CXB EXTEND-A-BUS with coaxial bus backbone
EB/DNET-FOG EXTEND-A-BUS with fiber optic backbone
Accessories:
AI-XFMR Wall-mount transformer 120 VAC (nom)
AI-XFMR-E Wall-mount transformer 240 VAC (nom)
AI-DIN DIN-rail mounting kit
BNC-T BNC “T” connector
BNC-TER 93-ohm BNC terminator
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2Installation
2.1 Introduction
The EXTEND-A-BUS series is intended to be panel mounted
into an industrial enclosure or into a wiring closet. Two #8 pan
head screws (not provided) are required for mounting.
Optionally, the bridge can be mounted on a DIN rail by
purchasing a DIN rail mounting kit.
2.2. ElectromagneticCompliance
The EXTEND-A-BUS series complies with Class A radiated
and conducted emissions as defined by FCC part 15 and
EN55022. This equipment is intended for use in non-residential
areas. Refer to the following notices in regard to the location of
the installed equipment.
Note: This equipment has been tested and found to comply
with the limits for a Class A digital device, pursuant to Part 15
of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This
equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential
area is likely to cause harmful interference in which case the
user will be required to correct the interference at his own
expense.
Warning
This is a Class A product as defined in EN55022. In a
domestic environment this product may cause radio
interference in which case the user may be required to take
adequate measures.
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The EXTEND-A-BUS has been tested to EN50082 Generic
Immunity Standard–Industrial Environment. This standard
identifies a series of tests requiring the equipment to perform to
a particular level during or after the execution of the tests. The
three classes of performance are defined by CCSI as follows:
Class A - Normal operation, however, occasional
reconfigurations may occur or throughput may be reduced due
to an error recovery algorithm by the ARCNET data link level
protocol.
Class B - Throughput reduced to zero and continuous
reconfigurations occur. Normal operation resumed after
offendingsignal removed.
Class C - Complete loss of function. Unit resets and normal
operation restored without human intervention.
At no time did the EXTEND-A-BUS fail to return to normal
operation or become unsafe during the execution of these tests.
A copy of the Declaration of Conformity is in the appendix.
2.3 Mounting the EXTEND-A-BUS
The EXTEND-A-BUS is intended for mounting onto a vertical
panel within an industrial control enclosure. Two #8 screws can
be used for mounting the EXTEND-A-BUS in a vertical
orientation. Refer to the mechanical specifications for details.
To mount the EXTEND-A-BUS onto a DIN rail, an optional
DIN rail mounting clip (AI-DIN) must be purchased and
installed on the rear of the EXTEND-A-BUS. Once the clip is
mounted to the EXTEND-A-BUS, the EXTEND-A-BUS can be
snapped onto the DIN rail.
2.4 Powering the EXTEND-A-BUS
The EXTEND-A-BUS requires either low voltage AC or DC
power in order to operate. Consult the specifications for power
requirements. Power is provided to a four pin removable keyed
Este manual sirve para los siguientes modelos
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