Contemporary Control Systems TD960801-0MC Operation & User’s Manual

Text of Contemporary Control Systems TD960801-0MC User Guide:

• Contemporary Control Systems TD960801-0MC, 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 delay introduced by the transceivers and twisted-pair wiring. If this latency approaches one bit time, the non-destructive bit- wise arbitration mechanism fail

• Contemporary Control Systems TD960801-0MC, 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 Warwick Science Park Sir William Lyons Rd. Conventry CV4 7EZ U.K.

• 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 Powered 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 voltage for internal use. Input current varies with

• Contemporary Control Systems TD960801-0MC, TD960801-0MC 22 3.2.3 Topologies 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 to implement and for many applications this is true. However, for some machines or processes, the star or distributed star topology would reduce wiring especially when devices are clustered in all directions from the main control pane

• 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 reconnected a disconnected cable. CAN n

• Contemporary Control Systems TD960801-0MC, TD960801-0MC 2 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 • F

• Contemporary Control Systems TD960801-0MC, 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 Tutorial & Product Guide.” Either of two transceivers are available on the backbone port. The coaxial bus (-CXB) transceiver requires coaxial cable allowing a total of eight EXTEND-A-BUS devices to be connected onto one wiring segment. The fiber optic (-FOG) transc

• Contemporary Control Systems TD960801-0MC, 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-Tee 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 feet (305 m). Figure 2-7. Appropriate terminators are required at the ends of both the coaxial cable backbone and DeviceNet subnets.

• Contemporary Control Systems TD960801-0MC, TD960801-0MC 9 2.4.4 AC Powered with Battery 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 charging. If the AC source fails, the EXTEND-A-BUS will operate from the battery source. Figure 2-4. AC Powered with Battery Backup 2.5 Connecting to the CAN Port The CAN port complies to the DeviceNet physical layer specification for an isolated port. Since the port is isolated, bus power (V+, V–)

• Contemporary Control Systems TD960801-0MC, 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 the traffic on the CAN port. Therefore, it is important that the CAN port be connected to the DeviceNet subnet connecting the master controller. All other EXTEND-A-BUSes should have their Data Rate switch set to S (sl

• Contemporary Control Systems TD960801-0MC, 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 electrically isolated CAN port has been provided capable of operating to the DeviceNet physical layer specification. This was done to minimize ground loop problems while providing isolation to the ARCNET backbone. The port conforms to the DeviceNet specification for a five position unsealed conn

• Contemporary Control Systems TD960801-0MC, TD960801-0MC 35 Type of Equipment: Industrial network extender Technical File TD960801-0FA 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 Yes EB/DNET-FOG Yes

• Contemporary Control Systems TD960801-0MC, TD960801-0MC 10 Terminators 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 bare 4 CAN_H white 5 V+ red Network Connector (Female Contacts) 1 2 3 4 5 Device Connector

• Contemporary Control Systems TD960801-0MC, 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, 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 -

• Contemporary Control Systems 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,

• 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, TD960801-0MC 24 Within 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 additional acknowledgments. Therefore, it is possible that a replicated transmission on one CAN segment may fail due to a cabling problem resulting in no acknowledgment while all other CAN segments view the transmission successful. However, the DeviceNe

• Contemporary Control Systems TD960801-0MC, TD960801-0MC ii Contents Chapter 1 Introduction......................................................... 1 1.1 Description ................................................ 1 1.2 Features..................................................... 2 1.3 Specifications ............................................ 2 1.4 Port Specifications .................................... 3 1.5 Ordering Information ................................ 4 Chapter 2 Installation ........................................................... 5 2.1 Introduction ............................................... 5 2.2 Electromagnetic Compliance........

• Contemporary Control Systems TD960801-0MC, TD960801-0MC 8 Figure 2-2. Redundant DC Powered 2.4.3 AC Powered 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 VAC, 47–63 Hz with the capability of delivering up to 4 VA of apparent power. The secondary of the transformer must not be grounded. For convenience, two auxiliary power supplies are available: • AI-XFMR for 120 VAC primary power • AI-XFMR-E for 240 VAC primary power Reference Figure 2-3. Figure 2-3. AC Powered

• Contemporary Control Systems TD960801-0MC, 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 active hubs. Hubs can be cascaded to reach the required distance. By using active hubs, star and distributed star topologies are possible. There is, however

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