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Manuale per l’uso Contemporary Control Systems TD960801-0MC

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  • Contemporary Control Systems TD960801-0MC - page 1

    EXTEND - A - BUS  for A Line of Fieldbus Extenders for DeviceNet User Manual #TD960801-0MC ...

  • Contemporary Control Systems TD960801-0MC - page 2

    T rademarks 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 © ...

  • Contemporary Control Systems TD960801-0MC - page 3

    TD960801-0MC ii Contents Chapter 1 Introduction ......................................................... 1 1.1 Description ................................................ 1 1.2 Features ..................................................... 2 1.3 Specifications ............................................ 2 1.4 Port Specifications ................ ...

  • Contemporary Control Systems TD960801-0MC - page 4

    TD960801-0MC iii 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 ...

  • Contemporary Control Systems TD960801-0MC - page 5

    TD960801-0MC 1 1 Intr oduction 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 del ...

  • Contemporary Control Systems TD960801-0MC - page 6

    TD960801-0MC 2 Extending the Interconnecting Medium or Bac kbone 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 ac ...

  • Contemporary Control Systems TD960801-0MC - page 7

    TD960801-0MC 3 En vironmental Operating: 0°C to 60°C Stora ge: -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 V olume I, Release 2.0 Data Rate 125 kbps, 250 kbps, 500 kbps select- able or A utobaud 125 kbps, 250 ...

  • Contemporary Control Systems TD960801-0MC - page 8

    TD960801-0MC 4 LEDs Link status: Reconfiguration status/activity status T ransceivers -CXB model: transformer coupled -FOG model: 850 nm duplex fiber optic Cable -CXB model: RG-62/u coaxial -FOG model: 62.5/125 µ m duplex fiber optic Connector s -CXB model: BNC -FOG model: ST  Maximum segment -CXB model: 305 meters (1000 ft) or subnet distance ...

  • Contemporary Control Systems TD960801-0MC - page 9

    TD960801-0MC 5 2 Installation 2.1 Introduction The EXTEND-A-BUS series is intended to be panel mounted into an industrial enclosure or into a wiring closet. T wo #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. Electromagnetic Compliance The ...

  • Contemporary Control Systems TD960801-0MC - page 10

    TD960801-0MC 6 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, ho ...

  • Contemporary Control Systems TD960801-0MC - page 11

    TD960801-0MC 7 connector . There are several methods for providing power . These methods are DC powered, redundant DC powered, AC powered and AC powered with battery backup. 2.4.1 DC Power ed Make connections as shown in Figure 2-1. The EXTEND-A- BUS incorporates a DC-DC converter that accepts a wide voltage range (10–36 VDC) and converts the vol ...

  • Contemporary Control Systems TD960801-0MC - page 12

    TD960801-0MC 8 Figur e 2-2. Redundant DC Powered 2.4.3 AC Power ed If only AC power is available, the EXTEND-A-BUS can be powered by the secondary of a low voltage transformer whose primary is connected to the AC mains. The secondary voltage must be in the range of 8 to 24 V AC, 47–63 Hz with the capability of delivering up to 4 V A of apparent p ...

  • Contemporary Control Systems TD960801-0MC - page 13

    TD960801-0MC 9 2.4.4 AC Power ed with Batter y Backup The EXTEND-A-BUS can also be powered from both an AC and DC power source. Usually , the DC source is from a battery supply which is connected as the DC powered option. Refer to Figure 2-4. In this application, the EXTEND-A-BUS does not charge the battery so separate provisions are required for c ...

  • Contemporary Control Systems TD960801-0MC - page 14

    TD960801-0MC 10 T erminators are required at the ends of trunk cables. If the EXTEND-A-BUS is located at the end of a trunk and no terminator is present, a discrete resistor terminator (121 ohms) can be connected under the screw terminals for CAN_H and CAN_L. Refer to Figure 2-5 for wiring details. 1 V - black 2 CAN_L blue 3 drain b are 4 CAN_H whi ...

  • Contemporary Control Systems TD960801-0MC - page 15

    TD960801-0MC 11 2.5.3 Autobauding Autobauding is the action of automatically matching the data rate of the EXTEND-A-BUS to the data rate of a master controller or scanner in a DeviceNet network. By moving the Data Rate switch to the A position and powering up the EXTEND-A-BUS, the EXTEND-A-BUS will attempt to determine the data rate by observing th ...

  • Contemporary Control Systems TD960801-0MC - page 16

    TD960801-0MC 12 2.6 Connecting to the Backbone Port The backbone (link) port is ARCNET compliant and, therefore, complies with the cabling rules for ARCNET networks. For more information on designing an ARCNET cabling system, refer to Contemporary Controls’ publication, “ARCNET T utorial & Product Guide.” Either of two transceivers are av ...

  • Contemporary Control Systems TD960801-0MC - page 17

    TD960801-0MC 13 More than two EXTEND-A-BUSes (but no more than eight) can be connected to one wiring segment. Insert the desired number of EXTEND-A-BUSes using BNC-T ee connectors to the backbone wiring. Make sure that any two EXTEND-A- BUSes are separated by at least 6 foot (2 m) of cable and that the complete cabling segment does not exceed 1000 ...

  • Contemporary Control Systems TD960801-0MC - page 18

    TD960801-0MC 14 Figure 2-8. A maximum of eight EXTEND-A-BUSes can occupy one coaxial backbone segment befor e an active hub is r equir ed. Use BNC “T ees” and terminators when making connections. One of each is included in the -CXB model. 2.6.2 Connecting Fiber Optic Cable (-FOG) Multimode fiber optic cable is typically available in three sizes ...

  • Contemporary Control Systems TD960801-0MC - page 19

    TD960801-0MC 15 Figure 2-9. A 62.5/125 µ m duplex fiber optic cable is used on the -FOG model up to a maximum of 1830 meters. for connecting cable between hubs and EXTEND-A-BUSes in the field using the manufacturers' labeling as a guide. However , remember that to connect point A to point B requires a paired fiber optic cable and that the lig ...

  • Contemporary Control Systems TD960801-0MC - page 20

    TD960801-0MC 16 2.6.3 Extending the 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 ...

  • Contemporary Control Systems TD960801-0MC - page 21

    TD960801-0MC 17 Figure 2-10. By using two AI3-CXS hubs, a distributed star topology is achieved. Note that the hub-to-hub distance can be a maximum of 610 m when using coaxial cable and that no terminators ar e used at the AI3 ports. However , the cables to the EXTEND-A-BUSes still cannot exceed 305 m. ...

  • Contemporary Control Systems TD960801-0MC - page 22

    TD960801-0MC 18 ...

  • Contemporary Control Systems TD960801-0MC - page 23

    TD960801-0MC 19 3 Operation 3.1 CAN Communications CAN was designed by Bosch and is currently described by ISO 1 1898. In terms of the Open Systems Interconnection model (OSI), CAN partially defines the services for layer 1 (physical) and layer 2 (data link). Other standards such as DeviceNet, Smart Distributed System and CANopen (collectively call ...

  • Contemporary Control Systems TD960801-0MC - page 24

    TD960801-0MC 20 3.1.1 Repeaters The usual approach to increasing network distance is to use repeaters. Repeaters provide signal boost to make up the loss of signal strength on a long segment. However , the problem with long CAN segments is usually not lack of signal strength but excessive signal latency . This latency is due to the propagation dela ...

  • Contemporary Control Systems TD960801-0MC - page 25

    TD960801-0MC 21 mounting into a larger industrial enclosure. As an option, the EXTEND-A-BUS can be DIN rail mounted by purchasing the appropriate kit. The EXTEND-A-BUS has two ports, one for the CAN network and the other for the ARCNET backbone. The device can be powered from either a low voltage AC or DC power supply . 3.2.1 CAN Port One electrica ...

  • Contemporary Control Systems TD960801-0MC - page 26

    TD960801-0MC 22 3.2.3 T opologies CAN-based device networks usually operate over a multidrop topology with provisions for short drops of typically six meters each. The trunk length depends upon the data rate and at 500 kbps, the maximum length of the trunk is 100 meters. Conceptually , the multidrop topology is easy to understand and appears easy t ...

  • Contemporary Control Systems TD960801-0MC - page 27

    TD960801-0MC 23 3.2.5 EXTEND-A-BUS Engine A high speed 32 Mhz 80C188 microprocessor provides the computing power for the EXTEND-A-BUS. The ARCNET port consists of a 20020 controller chip and coaxial bus or fiber optic transceiver . The CAN port consists of a Intel 82527 CAN controller and isolated 82C251 transceiver . The CAN port is capable of gen ...

  • Contemporary Control Systems TD960801-0MC - page 28

    TD960801-0MC 24 W ithin a CAN segment, at least one device must acknowledge the valid receipt of another device’ s transmission. That acknowledgment, however , does not extend beyond an EXTEND-A-BUS. Even though a successful transmission occurred on a CAN segment, that transmission must be replicated on all other CAN segments generating additiona ...

  • Contemporary Control Systems TD960801-0MC - page 29

    TD960801-0MC 25 MAC ID tests as in the case of DeviceNet. However , if a remote bridge loses power while all other devices remain powered, the failure mode should be no different than cutting the cable in the middle of a CAN segment. When power is restored to the remote bridges, the restart sequence should be the same as if the maintenance person r ...

  • Contemporary Control Systems TD960801-0MC - page 30

    TD960801-0MC 26 RED —The EXTEND-A-BUS has detected an internal problem with the CAN port requiring service. Flashing RED —The CAN port does not have sufficient voltage on its V+ and V– lines to power the optically isolated port. GREEN —The CAN port is receiving data. Flashing GREEN —The CAN port is commissioned, however , no CAN data has ...

  • Contemporary Control Systems TD960801-0MC - page 31

    TD960801-0MC 27 4 Service W arranty Contemporary Controls (CC) warrants its product to the original purchaser for one year from the product’ s shipping date. If a CC product fails to operate in compliance with its specification during this period, CC will, at its option, repair or replace the product at no charge. The customer is, however , respo ...

  • Contemporary Control Systems TD960801-0MC - page 32

    TD960801-0MC 28 Repair or replacement as provided above shall be the purchaser ’ s sole and exclusive remedy and CC’ s exclusive liability for any breach of warranty . T echnical Support Contemporary Controls (U.S.A.) will provide technical support on its products by calling 1-630-963-7070 each weekday (except holidays) between 8:00 a.m. and 5: ...

  • Contemporary Control Systems TD960801-0MC - page 33

    TD960801-0MC 29 Non-W arranty Repair CC provides a repair service for all its products. Repair charges are based upon a fixed fee basis depending upon the complexity of the product. Therefore, Customer Service can provide a quotation on the repair cost at the time a Returned Material Authorization (RMA) is requested. Customers pay the cost of shipp ...

  • Contemporary Control Systems TD960801-0MC - page 34

    TD960801-0MC 30 Ship the product, freight prepaid, to the location from which it was purchased: Contemporary Control Systems, Inc. 2431 Curtiss Street Downers Grove, IL 60515 U.S.A. Contemporary Controls Ltd Sovereign Court Two University of W arwick Science Park Sir W illiam L yons Rd. Conventry CV4 7EZ U.K. ...

  • Contemporary Control Systems TD960801-0MC - page 35

    TD960801-0MC 31 Appendices Appendix A—Permissible Segment Lengths A segment is defined as any portion of the complete ARCNET cabling system isolated by one or more hub ports. On a hubless or bus system, the complete ARCNET cabling system consists of only one segment with several nodes; however , a system with hubs has potentially many segments. A ...

  • Contemporary Control Systems TD960801-0MC - page 36

    TD960801-0MC 32 Appendix A (continued) Permissib le Cable Lengths and Nodes P er Segment T rans- ceiver Description Cabl e Connectors -CXS coaxial star RG-62/u BNC -CXB coaxial bus RG-62/u BNC -FOG duplex fiber optic 50/125 ST -FOG duplex fiber optic 62.5/125 S T -FOG duplex fiber optic 100/140 ST 1 This represents the minimum distance between any ...

  • Contemporary Control Systems TD960801-0MC - page 37

    TD960801-0MC 33 (2.5 Mbps) Cable Length Max Nodes Min Max Bus Segment Notes 0 2000 ft/610 m N/A 5.5 dB/1000 ft max 6 ft/2 m 1 1000 ft/305 m 8 5.5 dB/1000 ft max 0 3000 ft/915 m N/A 4.3 dB/km max 0 6000 ft/1825 m N/A 4.3 dB/km max 0 2 9000 ft/2740 m N/A 4.0 dB/km max ...

  • Contemporary Control Systems TD960801-0MC - page 38

    TD960801-0MC 34 Appendix B—Declaration of Conformity Applied Council Directives: Electromagnetic Compatibility Directive, 89/336/EEC Council Directive as amended by Council Directive 92/31/EEC & Council Directive 93/68/EEC Standard to which Conformity is Declared EN 55022:1995 CISPR22: 1993, Class A, Limits and Methods of Measurement of Radio ...

  • Contemporary Control Systems TD960801-0MC - page 39

    TD960801-0MC 35 T ype of Equipment: Industrial network extender T echnical File TD960801-0F A I, the undersigned, hereby declare that the product(s) specified above conforms to the listed directives and standards. George M. Thomas, President April 6, 1999 Model Directive EMC EB/DNET-CXB Y es EB/DNET-FOG Y es ...

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