Transcription

Data Highway/Data Highway Plus/Data Highway II/Data Highway 485CableInstallation Manual

Important User InformationBecause of the variety of uses for this product and because of the differencesbetween solid state products and electromechanical products, those responsiblefor applying and using this product must satisfy themselves as to theacceptability of each application and use of this product. For more information,refer to publication SGI-1.1 (Safety Guidelines For The Application,Installation and Maintenance of Solid State Control).The illustrations, charts, and layout examples shown in this manual are intendedsolely to illustrate the text of this manual. Because of the many variables andrequirements associated with any particular installation, Allen-BradleyCompany cannot assume responsibility or liability for actual use based upon theillustrative uses and applications.No patent liability is assumed by Allen-Bradley Company with respect to use ofinformation, circuits, equipment or software described in this text.Reproduction of the contents of this manual, in whole or in part, without writtenpermission of the Allen-Bradley Company is prohibited.Throughout this manual we make notes to alert you to possible injury to peopleor damage to equipment under specific circumstances.ATTENTION: Identifies information about practices orcircumstances that can lead to personal injury or death, propertydamage or economic loss.Attention helps you:- Identify a hazard- Avoid the hazard- recognize the consequencesImportant: Identifies information that is critical for successful application andunderstanding of the product.

Summary of ChangesData Highway/Data Highway Plus/Data Highway II/Data Highway 485 CableSummary of ChangesSummary of ChangesThis release of the publication contains new information for categorizingand routing cables. The new information appears in the following threechapters:Chapter 2 - Planning a Data Highway and Data Highway Plus CableSystem - I/O Raceway Layout Considerations (pages 2-14 through 2-16)Chapter 5 - Planning a Data Highway II Cable System - I/O RacewayLayout Considerations (pages 5-10 through 5-13)Chapter 8 - Planning a Data Highway 485 Cable System - I/O RacewayLayout Considerations (pages 8-4 through 8-6)Revision BarsWe call your attention to all of the new information with revision bars.A revision bar appears as a thick black line in the margin of the page asshown here.

Table of ContentsSummary of Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . .P 1Summary of Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Revision Bars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .P 1P 1Using this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iWho Should Read this Manual . . . . . . . . . . . . . . . . . . . . . . . . . .How this Manual Is Organized . . . . . . . . . . . . . . . . . . . . . . . . . . .Frequently Used Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Precautionary Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Related Products and Publications . . . . . . . . . . . . . . . . . . . . . . .iiiiiiiiiData Highway and Data Highway Plus Overview . . . . . . . .1 1Chapter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .The DH and DH Cable Systems . . . . . . . . . . . . . . . . . . . . . . . .DH Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .DH Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 11 11 11 4Planning a Data Highway or Data Highway PlusCable System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 1Chapter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Components of a Network Constructed with Station Connectorsand Droplines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Daisy Chaining (DH only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Necessary Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Determining Cable Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Selecting the Number of Station Connectors . . . . . . . . . . . . . . . . .I/O Raceway Layout Considerations . . . . . . . . . . . . . . . . . . . . . .2 22 122 122 122 132 14Constructing a Data Highway or Data Highway PlusCable System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 1Chapter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Construct a Network Using 1770 Station Connectors and DroplinesConstruct a Network Using 1770 XG Connector Kits and DroplinesConstruct a Network Using a Daisy Chain Configuration (DH Only)Reconfigure a Network Constructed with Droplines andStation Connectors (If Necessary) . . . . . . . . . . . . . . . . . . . . .2 13 13 23 173 323 33

iiTable of ContentsData Highway II Overview . . . . . . . . . . . . . . . . . . . . . . . . .4 1Chapter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .The DH II Cable System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .How Nodes Communicate on DH II . . . . . . . . . . . . . . . . . . . . . . .Communication Between Networks . . . . . . . . . . . . . . . . . . . . . . .Communication with Synchronous and Asynchronous Devices . . .4 14 14 44 44 4Planning a Data Highway II Cable System . . . . . . . . . . . . .5 1Chapter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Components of a DH II Network . . . . . . . . . . . . . . . . . . . . . . . . .Necessary Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Guidelines for Determining Cable Length . . . . . . . . . . . . . . . . . . .Selecting the Number of Taps . . . . . . . . . . . . . . . . . . . . . . . . . . .I/O Raceway Layout Considerations . . . . . . . . . . . . . . . . . . . . . .5 15 15 75 85 105 10Constructing a Data Highway II Cable System . . . . . . . . . .6 1Chapter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Install the Taps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Prepare the Trunkline Cable for Installation . . . . . . . . . . . . . . . . .Attach the Trunkline Cables and Terminators to the Tap . . . . . . . . .Install the Droplines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 16 16 56 76 9Data Highway 485 Overview . . . . . . . . . . . . . . . . . . . . . . .7 1Chapter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .The DH 485 Cable System . . . . . . . . . . . . . . . . . . . . . . . . . . . . .How Nodes Communicate on DH 485 . . . . . . . . . . . . . . . . . . . . .7 17 17 2Planning a Data Highway 485 Cable System . . . . . . . . . . .8 1Chapter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Components of a DH 485 Network . . . . . . . . . . . . . . . . . . . . . . .Necessary Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Guidelines for Determining Cable Length . . . . . . . . . . . . . . . . . . .Selecting the Number of Link Couplers . . . . . . . . . . . . . . . . . . . . .I/O Raceway Layout Considerations . . . . . . . . . . . . . . . . . . . . . .8 18 28 38 38 48 4Constructing a Data Highway 485 Cable System . . . . . . . .9 1Chapter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Install the Trunkline and DH-485 Nodes . . . . . . . . . . . . . . . . . . . .9 19 1

Table of ContentsiiiConstructing RS 232 C and Longline Cables . . . . . . . . . . .A 1Chapter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RS 232 C Connections (Less than 50 Cable Feet) . . . . . . . . . . . .Longline Connections (up to 7,000 Cable Feet) . . . . . . . . . . . . . . .A 1A 1A 3

PrefaceUsing this ManualUsing this ManualWho Should Readthis ManualRead this manual if you are planning and/or installing a DataHighway (DH), Data Highway Plus (DH ), Data Highway II (DH II), or DataHighway-485 (DH-485) cable network. We assume that you have a fundamentalunderstanding of electronics and electrical codes.How this ManualIs OrganizedThis manual explains how to plan and install a DH, DH , DH II, and DH-485cable system. Since the cable systems for the different networks are not alike,there are separate instructions.For information on the planning and construction of the different cable systems,refer to the following chapters:If installing a:Data Highway orData Highway PlusCable NetworkData Highway IICable NetworkData Highway 485Cable NetworkSee Chapter:Titled:1Data Highway and Data Highway Plus Overview2Planning a Data Highway or Data Highway Plus Cable System3Constructing a Data Highway or Data Highway Plus CableSystem4Data Highway II Overview5Planning a Data Highway II Cable System6Constructing a Data Highway II Cable System7Data Highway 485 Overview8Planning a Data Highway 485 Cable System9Constructing a Data Highway 485 Cable Systemi

PrefaceUsing this ManualFrequently Used TermsPrecautionary NotesWe use the following terms and abbreviations in this manual:When you see this term:It means:ComputerThe generic term for any intelligent programmable device thatcan be used with specific interface modules.DHData HighwayDH Data Highway PlusDH IIData Highway IIDH 485Data Highway 485DroplineCable that connects a node to a network via a stationconnector.NodeThe point at which a device, such as a programmablecontroller, connects to a network.PLC A Programmable Logic Controller, the term for anyAllen Bradley PLC product line (such as the PLC 2, PLC 3,PLC 4, PLC 5, SLC 500, etc.).TrunklineThe bus or central part of a cable system.In this manual, you may see:ATTENTION: Identifies information about practices orcircumstances that can lead to personal injury or death, propertydamage or economic loss.Attention helps you:- Identify a hazard- Avoid the hazard- recognize the consequencesImportant: Identifies information that is critical for successful application andunderstanding of the product.ii

PrefaceUsing this ManualRelated Products andPublicationsFor more information about related Allen-Bradley products, refer to thefollowing chart.Product:Catalog Number:Data Highway/Data Highway Plus Asynchronous InterfaceModule1770 KF2Data Highway Communication Controller Interface Module1771 KE, KFCommunication Adapter Module1771 KA2Data Highway/Data Highway Plus or Remote I/O onBroadband1771 KRFPLC 3 Communication Adapter Module1775 KAPLC 3 I/O Scanner Communication Adapter Module1775 SR, SR5Data Highway/Data Highway Plus Communication AdapterModule1785 KAData Highway II PLC 2 Communication Interface Module1779 KP2, KP2RData Highway II PLC 3 Communication Interface Module1779 KP3, KP3RData Highway II/Data Highway Plus Interface Module1779 KP5, KP5RData Highway II Synchronous Device Interface Module1779 KFM, KFMRData Highway II Asynchronous Device Interface Module1779 KFL, KFLRiii

PrefaceUsing this ManualFor more information about related Allen-Bradley publications, refer to thefollowing chart.ivPublication:Publication Number:Data Highway/Data Highway Plus Asynchronous Interface ModuleUser's Manual1770 6.5.13Data Highway Communication Controller Interface Module User'sManual1771 6.5.15Communication Adapter Module User's Manual1771 6.5.1Data Highway on Broadband Interface Module1771 6.5.59PLC 3 Communication Adapter Module User's Manual1775 6.5.1PLC 3 I/O Scanner Communication Adapter Module User's Manual1775 6.5.5Data Highway/Data Highway Plus Communication Adapter ModuleUser's Manual1785 6.5.1Data Highway II Overview1779 2.10Data Highway II PLC 2 Communication Interface Module User'sManual1779 6.5.3Data Highway II PLC 3 Communication Interface Module User'sManual1779 6.5.5Data Highway II/Data Highway Plus Interface Module User's Manual1779 6.5.6Data Highway II Synchronous Interface Module User's Manual1779 6.5.2Data Highway II Asynchronous Interface Module User's Manual1779 6.5.1PLC 5 Family Programmable Controllers1785 6.6.1Communication Interface Module1784 2.31Processor Communication Interface Module1784 2.21PC DH 485 Interface Module1784 2.23

Chapter1Data Highway andData Highway Plus OverviewChapter OverviewIn this chapter we provide you with an overview of the Data Highway and DataHighway Plus cable systems. We describe:the DH and DH cable systemshow nodes communicate on DHhow nodes communicate on DH communication between networksThe DH and DH Cable SystemsThe Allen-Bradley DH and DH systems are Local Area Networks (LANs).They connect programmable controllers, computers, and other devices so theycan communicate and exchange data with one another. A cable system is thephysical means of transmitting this data between nodes. On DH and DH networks, a node is a hardware interface.This manual describes the components of a DH and DH cable system andexplains how to construct a network. For the most part, the components andconstruction of a DH network are the same as the components and constructionof a DH network. There are, however, some differences between the networks.The types of devices used on the networks, and the communication protocol thenetworks use are two of the differences we discuss in this chapter.DH OverviewThis section provides an overview of the Data Highway cable system. In thissection we talk about:devices used on DHhow nodes communicate on DH1-1

Chapter 1DH and DH OverviewDevices Used on DHFigure 1.1 shows devices that can be used on a DH network.Important: The following illustration is intended only to depict the variousdevices that can be used on a Data Highway network. You should not interpretthis illustration to be a representation of how to configure your DH network.Figure 1.1Devices that can be used on a DH network.PLC-31775-KAPLC-21771-KA2To Data Highway PlusPyramid Integrator5130-RM11785-KAData Highway1770-KF21771-KE/KF1774 PLC1774-KAPLC-31775-S5Pyramid Integrator5130-KAComputerPersonalComputer18661How Nodes Communicate on DHA DH network uses peer-to-peer communication through a modifiedtoken-passing scheme called floating master. The master controls access tothe network and can initiate messages at any time. With this arrangement,nodesbid for temporary mastership based on their need to send information.In this way, each node has equal access to become the master.1-2

Chapter 1DH and DH OverviewUnlike a master/slave relationship, a floating master relationship does notrequire the current master to poll each node to grant permission to transmitinformation. This results in less overhead per transaction and a more efficientnetwork.On DH, the interface modules control access to the network locally. This meansif one module faults, the other modules continue to communicate on thenetwork.Through interface modules, nodes on a DH network can communicate directlywith nodes on a DH network. Nodes on DH networks, however, cannotcommunicate directly with nodes on DH II networks.To communicate between nodes on a DH network and a DH network, use the1785-KA Data Highway/Data Highway Plus Communication Adapter Module.Refer to the Data Highway Local Area Network Overview (publication1770-2.39) for more information.A message from a node on one network to a node on another network usesmessage transmission time in both networks. To achieve the best networkperformance, configure each network so that a minimum of messages crossbetween them. You can do this by grouping stations that need to frequentlycommunicate with each other on the same network.1-3

Chapter 1DH and DH OverviewDH OverviewThis section provides an overview of the DH cable system. In this section wetalk about:devices used on DH how nodes communicate on DH Devices Used on DH Figure 1.2 shows the devices that can be used on a DH network.Important: Figure 1.2 is intended only to depict the various devices that can beused on a Data Highway Plus network. You should not interpret this illustrationto be a representation of how to configure your DH network.Figure 1.2Devices that can be used on a DH network.PLC-5T60Workstationwith 6200 SW1784-KTPLC-21785-KA3PLC-31775-S5Pyramid Integrator5130-RM1To Data Highway1785-KAData Highway Computerwith 6001-F1E2 SWToolkitPersonalComputerwith 6001-F1E SWToolkitPyramid Integrator5130-KAPersonalComputer186621-4

Chapter 1DH and DH OverviewHow Nodes Communicate on DH DH uses token-passing protocol to allow nodes on the network to transmitmessages over the cable. With token-passing protocol, only the node possessingthe token can transmit messages. As long as a node possesses the token, it is themaster. This is rotation of link mastership.When a node has sent all of its messages or used all of its token-hold time, itpasses the token to the node with the next highest address. Token passingcontinues in this manner until the token is passed to the node with the lowestaddress. When the node with the lowest address is finished with the token, thecycle begins again.On DH , the interface modules control access to the network locally. Thismeans if one module faults, the other modules continue to communicate on thenetwork.Through interface modules, nodes on a DH network can communicate withnodes on both DH and DH II networks.To communicate with Use this module:nodes on DH and:Refer to this publication:DH1785 KA Data Highway/Data HighwayPlus Communication Adapter ModuleData Highway Local Area Network Overview (pub.no. 1770 2.39)DH II1779 KP5 Data Highway II/Data HighwayPlus Interface ModuleData Highway II Local Area Network Overview(pub. no. 1779 2.10)A message from a node on one network to a node on another network usesmessage transmission time in both networks. To achieve the best networkperformance, configure each network so that a minimum of messages crossbetween them. You can do this by grouping stations that need to frequentlycommunicate with each other on the same network.In many applications, nodes on a DH network need to communicate withdevices such as:computerscolor graphic terminalsdumb terminalsrobotscomputerized numerical controls (CNC)motion controllers1-5

Chapter 1DH and DH OverviewTo connect these devices to a DH interface module, you must provide yourown cable. The interface module and cable you use depends upon the type ofdevice you are connecting.In this chapter we provided you with a general overview of the DH and DH cable systems. You are now ready to plan your network. Refer to Chapter 2.Important: Chapter 2 provides important specifications, guidelines andprecautions that you need to know before you construct your DH or DH network. Be sure to read Chapter 2 before beginning any construction ofyour cable system.1-6

Chapter2Planning a Data Highway orData Highway Plus Cable SystemChapter OverviewThe Data Highway and Data Highway Plus cable systems give youflexibility to design a communication network that is tailored to yourparticular needs. To take full advantage of this flexibility, you should spendsufficient time planning how to install your cable system beforeassembling any of the hardware.Important: This chapter provides important specifications, guidelines andprecautions that you need to know before you construct your DH or DH network. Read this chapter carefully before beginning any construction ofyour cable system.After you have read this chapter you will be prepared to begin constructingyour DH or DH network. This chapter provides information to help youplan a DH or DH cable system, including:components of a network constructed with station connectors anddroplinesdaisy chaining (DH only)necessary toolsdetermining cable lengthselecting the type of station connectorselecting the number of station connectorsharmful environmental factorsAfter reading this chapter, consult schematic and engineering drawings ofyour plant facility for specific information concerning the best location forinstalling your cable network.2-1

Chapter 2Planning a Data Highway or Data Highway PlusCable SystemComponents of a NetworkConstructed with StationConnectors and DroplinesIf you have a DH network, you must construct it using station connectorsand droplines. If you have a DH network, you may use station connectorsand droplines, or daisy chaining to connect the devices on your network.In this section we explain the functions and specifications of thecomponents in a DH or DH network when it is constructed with stationconnectors and droplines. The following components are used to constructa DH or DH network:trunklinedroplinesstation connectorsterminatorsUse Figure 2.1 for reference when reading about these components.Figure 2.1A DH or DH network.PLC-2StationDroplineStationConnectorand plineStationConnectorand on ConnectorComputerStation195972-2

Chapter 2Planning a Data Highway or Data Highway PlusCable SystemTrunklineThe trunkline is the bus, or the central part of the network cable system.The length of the trunkline depends upon the location of the nodes in yournetwork, however, the maximum length for the trunkline is 10,000 feet(3050 meters).The trunkline is constructed of Belden 9463 twinaxial cable (Figure 2.2).This cable consists of a twisted pair of conductors wrapped in two layers ofshielding and a drain wire.Figure 2.2The trunkline and droplines are constructed of Belden 9463Twinaxial Cable.Filler CordFoil ShieldBraided ShieldInsulationClearConductor WireInsulationOuter JacketDrainWireBlueConductor WireFiller Cord11606You can order Belden 9463 twinaxial cable from Allen-Bradley inincrements of 100 feet (30.5 meters). The catalog number is 1770-CD.For information on installing the trunkline, refer to Chapter 3.DroplinesDroplines connect nodes to the trunkline. The length of droplines dependsupon your network’s specific needs, however, each dropline must be nomore than 100 feet (30.5 meters) long. If possible, keep the dropline cableslonger than 10 feet (3.0 meters) in length.Like the trunkline, droplines are constructed of Belden 9463twinaxial cable.For information on installing the droplines, refer to Chapter 3.2-3

Chapter 2Planning a Data Highway or Data Highway PlusCable SystemStation ConnectorsStation connectors connect droplines to the trunkline and also linktrunkline segments together.Important: A DH or DH network can have no more than 64 nodes. Eachstation connector on the trunkline counts as one of those nodes, even if nodropline or device is connected to that station connector.There are two types of station connectors that can be used on a DH or DH network:1770-SC station connector1770-XG connector kitThe type of station connector you choose for your network depends uponthe characteristics of your installation.If your installation:Use the:Because it:Requires frequent moving and 1770 XG connector kitreconfiguration of nodesProvides plug in type couplings that are quick andeasy to disconnect and reconnect.Seldom requires changing anodeProvides better physical protection and electricalisolation, and does not require any soldering toinstall.1770 SC stationconnectorYou may use both types of connectors on the same DH or DH network.For example, if you plan to frequently connect and disconnect a personalcomputer to and from the network via an asynchronous module, you canuse a 1770-XG connector kit at that node and 1770-SC connectors at theother nodes.The following table lists other factors to consider when selecting a stationconnector.2-4Characteristic:1770 SC Station Connector:1770 XG Connector Kit:Initial InstallationScrew TerminalSolderDisconnection/ReconnectionScrew TerminalPlug inGroundingEnclosure Tied to EarthGroundNoneEnclosureNEMA Type 13NoneMountingBolt down EnclosureNoneTesting RequiredNoneElectrical Continuity

Chapter 2Planning a Data Highway or Data Highway PlusCable SystemThe following sections describe the two types of station connectors inmore detail.1770-SC Station ConnectorThe 1770-SC station connector can be used on either a DH or DH network and can be used instead of the 1770-XG connector kit (describedlater in this chapter).You need one 1770-SC station connector for each node you want toconnect to the network.Each station connector connects one dropline to the trunkline and containsthe following components:a junction box with a removable covera terminal block wired with the following:- 0.05 mfd 500V DC capacitor (terminals 4 and 5)- jumper (terminals 7 and 9)- ground wire (terminal 10)- earth ground wire with luga packet containing the following:- D-shell cable connector hood- 15-socket female connector- packet of assembly hardware for the cable connector- terminator resistor (150 ohm, 1/4 watt)- shrink tubing- cable clamp pluginstallation instructionsFor information on installing a 1770-SC station connector, referto Chapter 3.2-5

Chapter 2Planning a Data Highway or Data Highway PlusCable System1770-XG Connector KitThe 1770-XG connector kit can be used on a DH or DH network, and canbe used instead of a 1770-SC station connector (explained earlier inthis chapter).You need one 1770-XG connector kit for each node you want to connect tothe network.Each 1770-XG connector kit connects one dropline to the trunkline andcontains the following components:a T-connectora jack connectortwo plug connectorsa 15-socket connectora plug terminatora jack terminator2-6

Chapter 2Planning a Data Highway or Data Highway PlusCable SystemFigure 2.3 shows the components included in a 1770-XG connector kit.Figure 2.3The components of a 1770 XG connector kit.Plug TerminatorJack TerminatorT - connectorJack ConnectorPlug Connectors15 - socket Connector116072-7

Chapter 2Planning a Data Highway or Data Highway PlusCable SystemTable 2.A lists the part numbers and manufacturers for the components inthe 1770-XG connector kit.Table 2.AManufacturers and part numbers for the 1770 XG connector kit.Part:Manufacturer:Manufacturer Part Number:T connectorTrompeterBN 73Jack connectorTrompeterBJ79 9Plug connectorTrompeterPL75 915 socket connectorand right angle hoodITT CannonDA 15S (Connector)DA 51211 (Hood)AmphenolJack terminator1170F A15S (Connector)TrompeterTNGB1 1 150Plug terminatorTrompeterTNG1 1 150The manufacturers listed in Table 2.A may be contacted at the addresseslisted below:Trompeter Electronics, Inc.31186 Labaya DriveWestlake Village, CA 91311ITT Cannon ElectricA Division of International Telephone and Telegraph Corporation666 East Dyer RoadSanta Ana, CA 92702Amphenol4300 Commerce Ct.Lisle, IL 60532The 1770-XG connector kit contains a T-connector to link one dropline tothe trunkline and to connect two trunkline segments together. The kit alsocontains a 15-socket connector, which connects the dropline to an interfacemodule on a node. Terminators are also included in the kit.2-8

Chapter 2Planning a Data Highway or Data Highway PlusCable SystemFigure 2.4 shows how a network can be constructed using the componentsof a 1770-XG connector kit.Figure 2.4A network constructed using the components of a 1770 XGconnector lugConnectorToT-connector186802-9

Chapter 2Planning a Data Highway or Data Highway PlusCable SystemFigure 2.5 shows a more detailed view of the T-connector, plug connectors,jack connector and the 15-socket connector, and how they connect thenetwork together.Important: You must assemble the T-connector only as shown.Figure 2.5Network connections with a 1770 XG connector kit.T - connectorJackLegJackLegPlug ConnectorDroplineTrunklineSegmentPlug ConnectorPlug LegJack ConnectorTrunkline Segment15 - socketConnector10803BThe T-connector has two jack legs and a plug leg. A plug connector fromthe 1770-XG connector kit attaches to each of the jack legs, and the jackconnector from the kit attaches to the plug leg.A dropline attaches to one of the plug connectors, and the trunklineattaches to the other plug connector. The trunkline also attaches to thejack connector.The 15-socket connector attaches to the dropline and then plugs into thenode interface module.The terminators plug into the T-connector. You need to install twoterminators (one plug terminator and one jack terminator) for a completeDH or DH cable system. If you order more than one 1770-XG connectorkit, you will have extra terminators. See the next section for moreinformation about terminators.2-10

Chapter 2Planning a Data Highway or Data Highway PlusCable SystemTerminatorsFigure 2.6 shows the terminators that must be installed in your DH or DH cable system if you use the 1770-XG connector kit. These terminators areincluded in the 1770-XG connector kit. You must install two terminators(one plug terminator and one jack terminator) for a complete DH orDH network.Figure 2.6Two terminators must be installed for a complete DH or DH cablesystem.Plug TerminatorJack Terminator11608Figure 2.7 illustrates how the terminators can be positioned in a DH orDH network.Figure 2.7Typical placement of terminators in a DH or DH ctors116052-11

Chapter 2Planning a Data Highway or Data Highway PlusCable SystemYou need one 1770-XG connector kit for each node you want to link to theDH network.The 1770-XG connector kit may be used on a DH or DH network.For information on installing a 1770-XG connector kit, refer to Chapter 3.Daisy Chaining (DH only)If you prefer not to use station connectors and droplines on your DH network, you may interconnect nodes in a daisy chain fashion. For moreinformation on daisy chaining, refer to Chapter 3.Necessary ToolsTo

Data Highway II/Data Highway485 Cable Summary of Changes This release of the publication contains new information for categorizing and routing cables. The new information appears in the following three chapters: Chapter 2 - Planning a Data Highway and Data Highway Plus Cable System - I/O Raceway Layout Considerations (pages 2-14 through 2-16)File Size: 953KBPage Count: 128Explore furtherDH comm problems - Allen Bradley - Forums.MrPLC.comforums.mrplc.comUSB-to-Data Highway Plus Cable Installation Instructionsliterature.rockwellautomation Data Highway Plus (DH ) Network Allen-Bradley United Sta www.rockwellautomation.com1784-U2DHP Problem connecting - Allen Bradley - Forums .forums.mrplc.comTwinax Cable Data Sheet - Digi-Keymedia.digikey.comRecommended to you b