Rockwell Automation Allen-Bradley ControlNet 1786 Series Installation Instructions Manual
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Rockwell Automation Allen-Bradley ControlNet 1786 Series Installation Instructions Manual

Rockwell Automation Allen-Bradley ControlNet 1786 Series Installation Instructions Manual

Coax media planning and installation guide
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ControlNet Coax
Media Planning
and Installation
Guide
1786-series
Installation Instructions

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Summary of Contents for Rockwell Automation Allen-Bradley ControlNet 1786 Series

  • Page 1 ControlNet Coax Media Planning and Installation Guide 1786-series Installation Instructions...

  • Page 2: Important User Information

    Reproduction of the contents of this copyrighted publication, in whole or part, without written permission of Rockwell Automation, is prohibited. Throughout this publication, notes may be used to make you aware of safety considerations.

  • Page 3: Preface

    Preface What’s in This Chapter ™ This manual describes the required components of a ControlNet Coax media system and how to plan for and install these required components. For information about this topic: Read: Understand the ControlNet Coax Media System Chapter 1 Plan a ControlNet Coax Media System Chapter 2...

  • Page 4: Common Techniques Used In This Manual

    Contact your local Rockwell Automation representative for: • sales and order support • product technical training • warranty support • support service agreements Technical Product Assistance If you need to contact Rockwell Automation for technical assistance, use Pre-Sales e-mail at RACle3net@ra.rockwell.com Publication CNET-IN002A-EN-P - December 2001...

  • Page 5: Obtain Technical Product Support

    Obtain Technical Product Support If you need to contact Rockwell Automation for technical assistance, try one of the following methods: • Call your local Rockwell Automation representative • ControlNet Post-sales Technical Support, 1.440.646.5800 • Web Links: http://www.ab.com — as a registered member, go to http://www.ab.com/mem/technotes/techmain.html...
  • Page 6 Notes: Publication CNET-IN002A-EN-P - December 2001...

  • Page 7: Table Of Contents

    Common Techniques Used in This Manual....2 Rockwell Automation Support ..... . . 2 Local Product Support .
  • Page 8 Table of Contents Order Parts ....... . . 2-20 What’s Next ........2-20 Chapter 3 Install a ControlNet Coax Media What’s in This Chapter .

  • Page 9: Overview Of The Controlnet Coax Media System

    Chapter Overview of The ControlNet Coax Media System What’s in This Chapter Read this chapter to familiarize yourself with the ControlNet cable system. For information about this topic: See page: Understand the ControlNet Cable System Understand the ControlNet Components Understand the ControlNet The ControlNet cable system gives you the flexibility to design a communication network for your particular application.

  • Page 10: Understand The Controlnet Components

    Overview of The ControlNet Coax Media System Term Means node any physical device connecting to the ControlNet cable system which requires a network address in order to function on the network — a link may contain a maximum of 99 nodes this address must be in the range of 1 - 99 and be unique to that link a two-port active physical layer component that reconstructs...

  • Page 11: Nodes

    Overview of The ControlNet Coax Media System Nodes Nodes are physical devices connecting to the ControlNet media system that require a network address in order to function on the network. 40953 Taps Taps connect each node on a network to the Coax media system via an integral 1m (39.6”) drop cable.

  • Page 12: Trunk Cable

    Overview of The ControlNet Coax Media System Trunk Cable The trunk cable is the bus, or central part of the ControlNet Coax media system. The trunk cable is composed of multiple sections of cable. The standard cable that can be used to construct trunk-cable sections is quad shield RG-6 type Coax.

  • Page 13: Segments

    Overview of The ControlNet Coax Media System Segments A segment is a collection of Coax trunk-cable sections, taps and two terminators. segment trunk-cable 40959 The total allowable length of a segment depends upon the number of taps in your segment and the Coax cable type used. See page 2-1 for detailed information.

  • Page 14: Links

    Overview of The ControlNet Coax Media System Links A link is a collection of nodes forming: • a segment • multiple segments connected together via repeaters Each node in a link must have a unique address in the range of 1-99. link segment segment...

  • Page 15: Network

    Overview of The ControlNet Coax Media System Network A network is the collection of nodes connected together by repeater adapters, repeater modules and bridges. link segment segment trunk-cable network segment segment link 40963 What’s Next Now that you have a general understanding of the ControlNet cable system, you are ready to design a ControlNet cable system for your specific requirements.
  • Page 16 Overview of The ControlNet Coax Media System Notes: Publication CNET-IN002A-EN-P - December 2001...

  • Page 17: Plan A Controlnet Coax Media System

    Chapter Plan a ControlNet Coax Media System What’s in This Chapter Use this chapter to determine your network requirements. For information about this topic: See page: Determine the Number of Taps You Need Connect Program Devices Determine What Type of Cable You Need Determine Trunk Cable Section Lengths Determine How Many Terminators You Need...
  • Page 18 Plan a ControlNet Coax Media System the initial network. This will minimize disruption to the network during operation. A disconnected drop cable can cause noise on the IMPORTANT network. Because of this, we recommend having only one unconnected drop cable per segment for maintenance purposes.

  • Page 19: Connect Program Devices

    Plan a ControlNet Coax Media System Each tap kit contains: TNC or BNC connector tap (1786-TPS, -TPR, -TPYS, -TPYR, -TCT2BD1) ControlNet cable labels screws 30012-M dust cap universal mounting bracket For noise suppression, ferrite beads are molded on the drop cable. Taps contain passive electronics and must be used ATTENTION for the network to function properly.

  • Page 20: Determine What Type Of Cable You Need

    Plan a ControlNet Coax Media System 1784-KTCX15 communication card on Coax media 1784-KTCX15 communication card and NAP 1786-CP 1784-KTC15 or 1784-KTCX15 -KTCx15 node node Using a 1770-KFD15 communication interface on Coax media Using a 1770-KFC15 communication interface on Coax media serial or parallel serial or parallel connection...

  • Page 21: Determine Trunk Cable Section Lengths

    Plan a ControlNet Coax Media System You should install all wiring for your ControlNet cable system in accordance with the regulations contained in the National Electric Code (or applicable country codes), state codes, and applicable municipal codes. For: Use this cable type: light industrial applications Standard-PVC...
  • Page 22 Plan a ControlNet Coax Media System The total allowable length of a segment containing standard RG-6 quad shield cable depends upon the number of taps in your segment. There is no minimum trunk-cable section length requirement. The maximum allowable total length of a segment is 1,000m (3,280ft) with two taps connected.

  • Page 23: Determine How Many Terminators You Need

    Plan a ControlNet Coax Media System If your segment requires 3 taps using 1786-RG6F/B EXAMPLE cable, the maximum segment length is: ([20.29 db - 3*.32 db] / 7.18 db] * 1000) (19.33 db / 7.18 db) * 1000 = 820 m (2692 ft) The total trunk-cable length or number of taps can be increased by installing repeaters on the segment.

  • Page 24: Configure Your Link With Repeaters

    Plan a ControlNet Coax Media System Do not power both repeaters at the same time. ATTENTION Powering both repeaters at the same time disrupts communication on the network. Use the fault-relay contact of the primary repeater to control power to the backup repeater.
  • Page 25 Plan a ControlNet Coax Media System Install Repeaters in Parallel When you install repeaters in parallel, you can install a maximum of 48 repeaters (the maximum number of taps per 250m segment) on any one segment. If your link is configured using repeaters in parallel, you count one of the repeater taps for one segment and the other repeater tap for the parallel segment that the repeater is connecting to the backbone network.

  • Page 26: Determine What Type Of Connectors You Need

    2-10 Plan a ControlNet Coax Media System Install Repeaters in a Ring For a ring toplogy, you must use the ControlNet Long-distance Fiber Repeater (catalog number 1786-RPFRL) or Extra-long-distance Fiber Repeater (catalog number 1786-RPFRXL). Refer to the Installation Instructions that shipped with your repeater for an example ring toplogy drawing.

  • Page 27: Using Redundant Media (Optional)

    Plan a ControlNet Coax Media System 2-11 cable enters and In this example, ControlNet cable: exits from the side panel wall • enters and exits the panel isolated-bulkhead enclosure from the side using connectors bullet connector isolated-bulkhead connectors • contains two adjacent taps connected by a barrel barrel connector...
  • Page 28 2-12 Plan a ControlNet Coax Media System In this figure, the redundant cable trunk cable is trunk cable trunk cable A = trunk cable B = node node node 20134-m Node supporting redundant media Publication CNET-IN002A-EN-P - December 2001...
  • Page 29 Plan a ControlNet Coax Media System 2-13 Observe these guidelines when planning a redundant media system. • Route the two trunk cables (trunk cable A and trunk cable B) differently to reduce the chance of both cables being damaged at the same time. •...
  • Page 30 2-14 Plan a ControlNet Coax Media System trunk cable A = SEGMENT terminator trunk cable B = terminator repeater node node node node repeater trunk cable B = terminator trunk cable A = SEGMENT Node supporting redundant media terminator 20135-m •...

  • Page 31: Using Ip67 Media

    Plan a ControlNet Coax Media System 2-15 Using IP67 Media Sealed media components are ControlNet taps and connectors suitable for use in harsh environments. The sealed tap contained in the ControlNet IP67 Tap and Connector Installation Kit (cat. no. 1786-TCT2BD1) protects the BNC connector, which is not water-tight. The following figure shows a sample installation featuring IP67-rated sealed media components.

  • Page 32: General Wring Guidelines

    2-16 Plan a ControlNet Coax Media System There are three categories of conductors: Category: Includes: • ac power lines • high-power digital ac I/O lines • high-power digital dc I/O lines • power connections (conductors) from motion drives to motors •...
  • Page 33 Plan a ControlNet Coax Media System 2-17 Wiring External to Enclosures Cables that run outside protective enclosures are relatively long. To minimize cross-talk from nearby cables, it is good practice to maintain maximum separation between the ControlNet cable and other potential noise conductors.

  • Page 34: Order Components

    2-18 Plan a ControlNet Coax Media System Inductive loads switched by solid-state output devices alone do not require surge suppression. However, inductive loads of ac output modules that are in series or parallel with hard contacts require surge-suppression to protect the module output circuits as well as to suppress transient EMI.
  • Page 35 Plan a ControlNet Coax Media System 2-19 • maximum trunk-cable length of high-flex RG6F trunk cable = 666m (2187ft), with 2 taps • 75Ω terminators are required on both ends • one tap with an unconnected drop cable may be installed for maintenance purposes •...
  • Page 36 2-20 Plan a ControlNet Coax Media System Order Parts Item Cat. No. Guidelines Quantity needed Tapstraight T-tap You need a tap for each connection to the number of repeaters x 2 straight Y-tap trunk cable (nodes and repeaters). right angle T-tap Each tap kit contains: two BNC connector number of nodes right angle Y-tap...
  • Page 37 Read Chapter 2, Plan a ControlNet Coax Media IMPORTANT System, before you install your network. To ensure the integrity of your ControlNet IMPORTANT connection, use only Rockwell Automation cables and connectors, as well as the ControlNet Coax Toolkit, catalog number 1786-CTK. Publication CNET-IN002A-EN-P - December 2001...

  • Page 38: Install The Trunk Cable

    Install a ControlNet Coax Media System Install the Trunk Cable Install your trunk cable, observing your cable supplier’s installation instructions and these guidelines. Wire the External to Enclosures When you pull the RG-6 type Coax cable through multiple conduit bends, follow these specifications. For this Coax The pull strength The bend radius should...

  • Page 39: Mount The Taps

    Install a ControlNet Coax Media System • Be certain that the location where you are going to mount does not cause any cable bend radii to exceed the limits listed on page 3-2. • Do not mount the tap in a position that routes the drop cable over any ac power terminals on nearby modules.
  • Page 40 Install a ControlNet Coax Media System 2. Using the screws provided with the tap, attach the tap to the universal mounting bracket. universal mounting Y-Tap bracket T-Tap dust cap dust cap universal mounting bracket (provided with tap) 20084-m Use only the screws that are packaged with the tap.

  • Page 41: Install A Repeater Adapter

    Install a ControlNet Coax Media System Mount a Tap Through the Body Holes Mount the tap to a suitable fixture using: screws and flat washers body holes body holes You can use a variety tie wrap of screw types. 20083-m Do not over-tighten the screws.

  • Page 42: Install Cable Connectors

    Install a ControlNet Coax Media System Install Cable Connectors After you have mounted the taps, you need to attach cable connectors to the ends of your trunk-cable sections. See page: collect your tools calibrate the cutting blades strip the cable attach the cable connectors 3-14 test for electrical shorts and continuity...

  • Page 43: Locally Available Tools

    Install a ControlNet Coax Media System Locally Available Tools You will also need these local-purchase tools (not supplied in the kit): • 3/32” Allen wrench • heat gun (if you are installing IP65 or IP67 corrosion-resistant connectors) Calibrate the Cutting Blades Be certain to perform the calibration procedure the ATTENTION...
  • Page 44 Install a ControlNet Coax Media System 4. Adjust the screws of the memory clip so that the blades just touch the calibration tool. Do not over-tighten the screws of the cable strip ATTENTION tool. The blades should not bend, shift, or penetrate the calibration tool.

  • Page 45: Strip The Cable

    Install a ControlNet Coax Media System Strip the Cable Be certain to perform the calibration procedure the ATTENTION first time you use the tool and every time you change the blade or both memory cartridges. Refer to Page 3-7 for the proper calibration procedure. Check the outer braid of cable for cut or scored braid ATTENTION wire after stripping the cable.
  • Page 46 3-10 Install a ControlNet Coax Media System 3. Insert the cable into the cable strip tool’s cutting chamber so that approximately 25.4mm (1”) of extra cable extends beyond the edge of the tool. 25.4 mm (1") extra cable cable 20073 4.
  • Page 47 Install a ControlNet Coax Media System 3-11 5. Holding the cable in one hand, place the index finger of your other hand inside the chamber-gauge ring and turn the strip tool 360° around the cable. Turn four or five full rotations until the strip tool glides easily around the cable.
  • Page 48 3-12 Install a ControlNet Coax Media System e. Clean the remaining cable parts from the strip chamber after each use. This procedure should appropriately strip the cable, exposing these layers of the cable: all 4 shield layers white foam electric braid/tape/braid/tape or 1st tape, if tape is bonded...
  • Page 49 Install a ControlNet Coax Media System 3-13 all four shield layers white insulation or braid/tape/braid/tape 1st tape center conductor FEP CL2P sheath 11.44 mm 4.0 mm 3.7 mm 20076a 8. Be certain that the center conductor is 4.0 mm. Use the imprint guide on the back of the ControlNet tap or the calibration tool to verify this.

  • Page 50: Attach The Connectors To The Cable

    3-14 Install a ControlNet Coax Media System Check the outer braid of cable for cut or scored braid ATTENTION wire after you strip the cable. If the braid is damaged, cut off the end and strip the cable again. You may need to adjust the appropriate striper blade by backing the set screw out 1/8 of a turn.
  • Page 51 Install a ControlNet Coax Media System 3-15 Push the flare/calibration tool gently and rotate slightly onto the connector while applying pressure. This will work the base of the connector underneath the wire braid slowly. 41890 3. With the center pin in place, use the crimp tool to crimp the pin into place.
  • Page 52 3-16 Install a ControlNet Coax Media System 5. Slide the crimp ferrule over the three outer shields and connector base until it meets the shoulder on the connector. 20077e 6. Using the crimp tool, crimp the ferrule. Position the crimp tool on the ferrule as close as possible to the connector base and ferrule meeting line.
  • Page 53 Install a ControlNet Coax Media System 3-17 Many network problems are due to improperly installed connectors. You should have tight-fitting connectors on the ends of all your cables. Pull the connector to verify that it is attached. If it is loose or comes off, snip off the connector and install a new one.

  • Page 54: Test For Electrical Shorts And Continuity

    3-18 Install a ControlNet Coax Media System e. Inspect the heat-shrink tubing to ensure that there are no voids where the glue has incompletely melted. Voids could cause a loss of the IP67 rating. Place the tubing against the shoulder of the TNC connector Ensure that there are no voids where glue has...

  • Page 55: Connect Cable Sections

    Install a ControlNet Coax Media System 3-19 4. At the other end of the cable, use the NetLinx Media Checker, an ohmmeter, or continuity tester to test for electrical continuity. If resistance reading indicates: Then: that a short exists continue to next section there is no short use your wire cutters to cut off the connector, install a new connector...

  • Page 56: Terminate Segments

    3-20 Install a ControlNet Coax Media System Terminate Segments The taps on the ends of the segment have only one cable connector attached to them. This leaves an open, or unterminated, end on the segment. Signals transmitted along the cable will reflect off these unterminated ends and interfere with transmission.

  • Page 57: Connect Devices

    Install a ControlNet Coax Media System 3-21 Connect Devices After terminating your segments, you connect your devices. To connect a programming terminal through the NAP page 3-21 repeater page 3-22 ControlNet processor, adapter or programming terminal procedure below via a communication interface 1.

  • Page 58: Connect The Repeater To A Controlnet Link

    3-22 Install a ControlNet Coax Media System 2. Connect the other end of the 1786-CP cable to the NAP on the ControlNet communication interface installed in (or connected to) your programming terminal. Do not use the 1786-CP cable as shown below. ATTENTION These connections could result in network failures.
  • Page 59 Install a ControlNet Coax Media System 3-23 segment 1 20093-i dust cap 2. Remove and discard the dust caps from the repeater BNC jacks. 3. Connect the designated tap’s straight or right-angle connector to the BNC connector on the repeater. 4.
  • Page 60 3-24 Install a ControlNet Coax Media System Notes: Publication CNET-IN002A-EN-P - December 2001...

  • Page 61: Appendix A What's In This Appendix

    Appendix Mounting Dimensions What’s in This Appendix Use these mounting dimensions to mount your taps, universal mounting brackets, and repeaters. Taps Make copies of these templates as necessary to help you mark placement for your taps. Y-tap T-tap 30.23 mm 35.66 mm 15.24 mm (0.60")

  • Page 62: Universal Mounting Bracket

    Mounting Dimensions Universal Mounting Bracket 58.42 mm (2.30") 49.53 mm (1.95") 15.47 mm (0.609") 19.05 mm 30.94 mm (0.75") (1.128") 9.53 mm 20170-m Publication CNET-IN002A-EN-P - December 2001...

  • Page 63: Appendix B What's In This Appendix

    Appendix Maintain the Cable Strip Tool What’s in This Appendix Follow the instructions in this appendix to perform the following tasks on the cable strip tool, supplied with the ControlNet Coax Toolkit (1786-CTK): For information about this topic: See page: Reverse/Replace the Cutting Blades Change the Memory Blade Holder Reverse/Replace the...
  • Page 64 Maintain the Cable Strip Tool 2. Slide the memory blade cartridge out of the strip tool. 20183-m If you are: Go to: reversing the memory blade cartridge the next step to use the second set of blades replacing the memory blade cartridge step 4 3.

  • Page 65: Change The Memory Blade Holder

    Maintain the Cable Strip Tool 4. Align the memory blade cartridge (the side with the raised notches) to the raised area on the inside of the strip tool and slide the new memory blade cartridge in — the blades should be on top as you slide the cartridge in.
  • Page 66 Maintain the Cable Strip Tool 2. Snap the memory blade holder off the rod and remove it from the strip tool. 20070-m 3. Position the appropriate memory blade holder on the rod and snap the holder into place. 4. Swing the memory blade holder closed. 20069-m Publication CNET-IN002A-EN-P - December 2001...
  • Page 67 Index trunk cable section lengths 2-5 type of cable connectors needed 2-10 abbreviations and symbols 2-18 ferrite beads 2-15 application considerations installing cable connectors 3-6 trunk cable 3-2 2-10, 2-20 barrel connector 1-1, 1-6, 2-18 link 1-4, 2-10 BNC cable connectors repeater configurations 2-8 installing mounting taps...
  • Page 68 2-10, 2-20 isolated bulkhead connector 2-4, 3-2 RG-6 cable 2-20 right angle connector 2-10 right-angle connector link Rockwell Automation support definition local product support 2-18 planning questions or comments about manual technical product support media 2-11 redundant...
  • Page 69 Index installing pull strength universal mounting bracket stripping mounting dimensions 3-20 terminating 3-18 testing for shorts and continuity 2-17, 3-2 wiring external to enclosures Web addresses 2-17, 3-2 wiring inside enclosures 1-2, 1-4, 2-5, 3-19 wiring trunk cable section 2-17, 3-2 external to enclosures 2-17, 3-2 inside enclosures...
  • Page 70 Index Publication CNET-IN002A-EN-P - December 2001...
  • Page 71 How Are We Doing? Your comments on our technical publications will help us serve you better in the future. Thank you for taking the time to provide us feedback. You can complete this form and mail it back to us, visit us online at www.ab.com/manuals, or email us at RADocumentComments@ra.rockwell.com Pub.
  • Page 72 PLEASE FASTEN HERE (DO NOT STAPLE) Other Comments PLEASE FOLD HERE NO POSTAGE NECESSARY IF MAILED IN THE UNITED STATES BUSINESS REPLY MAIL FIRST-CLASS MAIL PERMIT NO. 18235 CLEVELAND OH POSTAGE WILL BE PAID BY THE ADDRESSEE 1 ALLEN-BRADLEY DR MAYFIELD HEIGHTS OH 44124-9705...
  • Page 74 Back Cover Publication CNET-IN002A-EN-P - December 2001 PN 955135-80 Supersedes Publication 1786-6.2.1 - April 1998 © 2001 Rockwell International Corporation. Printed in the U.S.A.

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