DH485 Communication Interface - Rockwell Automation
DH 485Communication Interface(Cat. No. 1770 KF3)User’s Manual
Important User InformationBecause of the variety of uses for this product and because of the differences between solidstate products and electromechanical products, those responsible for applying and usingthis product must satisfy themselves as to the acceptability of each application and use ofthis product. For more information, refer to publication SGI-1.1 (Safety Guidelines ForThe Application, Installation And Maintenance of Solid State Control).The illustrations, charts, and layout examples shown in this manual are intended solelyto illustrate the text of this manual. Because of the many variables and requirementsassociated with any particular installation, Allen-Bradley Company cannot assumeresponsibility or liability for actual use based upon the illustrative 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 written permissionof the Allen-Bradley Company is prohibited.Statement of Compliancewith FederalCommunicationsCommissionStatement of Compliancewith Canadian Departmentof CommunicationsThis device complies with Part 15 of the FCC Rules. Operation is subject to the followingtwo conditions: (1) this device may not cause harmful interference, and (2) this devicemust accept any interference received, including interference that may cause undesiredoperation.Avis de Conformité auxnormes du ministère desCommunications du CanadaLe présent appareil numérique n'émet pas de bruits radioélectriques dépassant les limitesapplicables aux appareils numériques de la classe A prescrites dans le Règlement surle brouillage radioélectrique édicté par le ministère des Communications du Canada.L'exploitation faite en milieu résidential peut entraîner le brouillage des réceptions radio ettélé, ce qui obligerait le propriétaire ou l'opérateur à prendre les dispositions nécessairespour en éliminer les causes.Warning and CautionSymbolsThroughout this manual, we make notes to alert you to possible injury to people or damageto equipment under specific circumstances.This digital apparatus does not exceed the Class A limits for radio noise emissions fromdigital apparatus set out in the Radio Interference Regulations of the Canadian Departmentof Communications. Operation in a residential area may cause unacceptable interference toradio and TV reception requiring the owner or operator to take whatever steps arenecessary to correct the interference.WARNING: Tells readers where people may be harmed ifprocedures are not followed properly.CAUTION: Tells readers where machinery may be damaged or economicloss can occur if procedures are not followed properly.Warnings and Cautions:identify a possible trouble spottell what causes the troublegive the result of improper actiontell the reader how to avoid troubleWARNING: No user serviceable parts or adjustments inside module.Refer servicing to qualified personnel. 1991 Allen-Bradley Company, Inc.IBM and AT are registered trademarks of the International Business Machine Corporation.PLC is a registered trademark of Allen-Bradley Company, Inc.
Table of ContentsManual Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .P 1Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Related Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Publication Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Related Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Product Catalog Number . . . . . . . . . . . . . . . . . . . . . . . . . . . .P 1P 1P 1P 1P 1Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 1The DH 485 Communication Interface . . . . . . . . . . . . . . . . . . . . .The DH 485 Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .The RS 232C/DF1 Data Link . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 11 21 2Installing the KF3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 1Installation Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Interface Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .DH 485 Cabling Considerations . . . . . . . . . . . . . . . . . . . . . . . . .RS 232C Cabling Considerations . . . . . . . . . . . . . . . . . . . . . . . .Modem Cabling Considerations . . . . . . . . . . . . . . . . . . . . . . . . . .Voltage Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Replacing Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Positioning the KF3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 12 12 22 82 122 132 142 15Configuring the KF3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 1Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Basic Communication Parameters . . . . . . . . . . . . . . . . . . . . . . . .Advanced Communication Parameters . . . . . . . . . . . . . . . . . . . .Verifying Your Configuration Parameters . . . . . . . . . . . . . . . . . . .3 13 53 73 10Communicating with the KF3 . . . . . . . . . . . . . . . . . . . . . . .4 1DF1 Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Communicating with DH 485 Master Devices . . . . . . . . . . . . . . . .Communicating with DH 485 Slave Devices . . . . . . . . . . . . . . . . .Communicating with a Modem . . . . . . . . . . . . . . . . . . . . . . . . . . .4 14 64 64 9Troubleshooting the KF3 . . . . . . . . . . . . . . . . . . . . . . . . . .5 1Interpreting the Front Panel LEDs . . . . . . . . . . . . . . . . . . . . . . . .Interpreting the Numeric Displays . . . . . . . . . . . . . . . . . . . . . . . .5 15 2
iiTable of ContentsSpecifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A 1RS 232C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .DH 485 Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A 1A 1A 1A 2A 2Diagnostic Command Support . . . . . . . . . . . . . . . . . . . . . .B 1Diagnostic Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Diagnostic Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Diagnostic Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Diagnostic Counter Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Read Link Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Set Link Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B 1B 2B 4B 5B 6B 6
PrefaceManual OverviewThis manual:describes the features and capabilities of the 1770-KF3tells you how to install, configure, and operate your 1770-KF3gives troubleshooting tips on diagnosing problemsdefines the specifications of the 1770-KF3AudienceRead this manual if you are installing and configuring a 1770-KF3Interface Module for use with a DH-485 network.You should be familiar with:Allen-Bradley SLC 500 series of programmable controllersAllen-Bradley DH-485 networksRelated PublicationsRelated ProductsPublicationPublication NumberData Highway/Data Highway Plus/DH-485Protocol and Command Set Manual1770-6.5.16SLC 500 Advanced Programming Software Manual1747-801PC/DH-485 Interface Module Installation Data1784-2.23Allen-Bradley Standard Driver SoftwareUser’s Manual (6001-F2E)6001-6.5.5Bulletin 2755 Bar Code Decoder User’s Manual2755-816ProductCatalog NumberAdvanced Programming Software1747-PA2EPC/DH-485 Interface Module1784-KRAllen-Bradley Standard Driver Software6001-F2EBar Code Decoder2755-DM6SLC 500 RS-485 Link Coupler1747-AICP-1
Chapter1Product OverviewThe DH 485 CommunicationInterfaceThe DH-485 Communication Interface module links host computers withthe Allen-Bradley RS-485 Data Highway (DH-485). The module supportsthe protocol required to act as a node on the DH-485 network, freeing thehost computer from this task.Figure 1.1The DH 485 Communication Interface (1770 KF3)Important: The DH-485 Communication Interface module (cat. no.1770-KF3) will be referred to as “the KF3” or “the module” throughout theremainder of this manual.The host computer communicates with the KF3 over an RS-232C linkusing full-duplex or half-duplex DF1 protocol. Through the KF3, the hostcomputer can communicate with nodes on the DH-485 network.1 1
Chapter 1Product OverviewThe DH 485 NetworkThe DH-485 communication network allows devices on the plant floor toshare information. Via the network, application programs can:monitor process and device parameters and status, including fault andalarm detectionperform data acquisitionperform supervisory control functionsupload/download PLC programs over the networkThe DH-485 network offers:interconnection of up to 32 nodesmulti-master capabilityslave devicestoken-passing access controlthe ability to add or remove nodes without disruption of the networkmaximum cable length of 4,000 feetdata rates up to 19,200 baudThe RS 232C/DF1 Data LinkThe RS-232C/DF1 data link features:full- or half-duplex DF1 protocoldata rate up to 19,200 baudcable length up to 50 feetpoint-to-point modem connectionBlock Check Character (BCC) or Cyclic Redundancy Check (CRC16)error detectionThe DF1 ProtocolDF1 is a full- or half-duplex link protocol designed to carry messagesintact over a link. The link protocol delimits messages, detects and signalserrors, retries after errors and controls message flow.Full-duplex protocol is intended for high performance applications wheremaximum throughput is required. Full-duplex protocol only works on apoint-to-point link that allows for two-way simultaneous transmission.Half-duplex protocol provides a less effective utilization of resources thanfull-duplex, but is easier to implement. It can operate on point-to-point ormulti-point applications.1 2
Chapter 1Product OverviewTable 1.AProtocol ApplicationsProtocolPoint to PointMulti PointFull duplexYesNoHalf duplexYesNoA description of these protocols is given in the Data Highway/DataHighway Plus/DH-485 Protocol and Command Set Manual (publication1770-6.5.16).1 3
Chapter2Installing the KF3Installation ProceduresInterface ConnectionsTo install the KF3, follow these steps:1.Define your network needs.2.Construct the necessary cables.3.Ground and terminate your network correctly.4.Determine the correct voltage for your application and set the KF3’svoltage selector. Change power cord if necessary.5.Check the KF3’s default configuration parameters and change thosewhich are not suitable for your application.Figure 2.1 shows the back panel of the KF3, including its twocommunication connectors. The connector labelled RS-232 Computerconnects to the host computer via an RS-232C cable. The connectorlabelled DH-485 connects to the DH-485 network.Figure 2.1KF3 Back PanelFusesFUSES: 0.1A 250VTYPE 5mm X 20MM115V/230VVoltage SelectorCAUTION: FOR CONTINUEDPROTECTION AGAINST RISKOF FIRE REPLACE ONLYWITH THE SAME TYPEAND RATING OF FUSE.CAUTION:DOUBLE FOLD NEUTRALFUSESPower SwitchAC power connector(115V/230V)DH 485 connectorlinks to DH 485networkËËËËËËRS 232C connectorlinks to host computervia RS 232C cable2 1
Chapter 2Installing the KF3DH 485 CablingConsiderationsDepending on your application, you can use the KF3 module tocommunicate with a single station via a point-to-point link, or withmultiple DH-485 stations (for example, the SLC 500 family ofprogrammable controllers), via the DH-485 network.You must construct the necessary cable or cables for each application. Usea jacketed and shielded cable with two twisted wire pairs and a drain wire.One pair provides a balanced signal line; one wire of the other pair servesas a common signal reference for all nodes on the link. The shield reducesthe effect of electromagnetic noise from the industrial environment.Belden #9842 cable is recommended.The pinouts for the KF3’s DH-485 connector are shown in Figure 2.2.Figure 2.2KF3 PinoutsFUSES: 0.1A 250VTYPE 5mm X 20MMCAUTION: FOR CONTINUEDPROTECTION AGAINST RISKOF FIRE REPLACE ONLYWITH THE SAME TYPEAND RATING OF FUSE.CAUTION:DOUBLE FOLD NEUTRALFUSESËËËGrounding and Terminating the NetworkThe precise configuration of the cable connectors is determined by theirposition on the network.Connections between intermediate nodes (nodes that are not at eitherend of the network) require no jumpers. Table 2.A shows the wire andterminal connections for a cable linking any two intermediate nodes.2 2
Chapter 2Installing the KF3Table 2.AWire/Terminal Connections for Imtermediate NodesFor this Wire/PairConnect this WireTo this TerminalShield/DrainNon jacketedTerminal 2 - ShieldBlack/WhiteBlack WireCut back - No connectionWhite WireTerminal 3 (Signal Ground)Black WireTerminal 4 (Data A)Red WireTerminal 5 (Data B)Black/RedThe nodes at each end of the network must be terminated. Install a jumperwire between terminals 5 and 6 to enable the impedance built into themodule.One (not both) of the nodes at the end of the network must have an earthground connection for the communication cable shield. For the nodeat one end of the network, whether it is the KF3 or some other device,connect the shield to ground by installing a jumper wire between terminals1 and 2 of the terminal block.CAUTION: Be sure no other node on the network has its shieldconnected to ground.Figure 2.3 illustrates proper jumper connections for end nodes.Figure 2.3Jumper Connections for End NodesJumper toground shieldJumper toterminate nodeJumper toterminate nodeKF3 on one end of the linkSLC 500 or other device on the otherend of the link* The black wire of the white/black pair should be cut back (no connection).2 3
Chapter 2Installing the KF3Connecting via a DH 485 Link (Point to Point Configuration)Figure 2.4 shows a point-to-point link consisting of a single SLC 500programmable controller and one host computer station.Figure 2.4A Point to Point DH 485 LinkRS 232CCableDH 485 CableBelden #9842LinkCoupler1747 AICHost ComputerSLC 500ControllerKF31747 C11 CableThis configuration requires a KF3 and one link coupler. The SLC 500controller is connected to the link coupler with a 1747-C11 cable. TheKF3 is connected directly to the link coupler. In this topology, both theKF3 and the SLC 500 are end nodes.Construct a cable to attach the DH-485 connector on the back of theKF3 module to the link coupler. Figure 2.5 shows the connection for apoint-to-point DH-485 application. The shield ground could be at eitherend, but must be at one end, and one end only.Figure 2.5Connection for KF3 and Single SLCJumper to groundshield connectorJumper toterminate nodeKF3 on one end of the linkJumper toterminate nodeSLC 500 or other device at the other end of the link* The black wire of the white/black pair should be cut back (no connection).2 4
Chapter 2Installing the KF3Connecting to a DH 485 Network (Multi Point Configuration)Figure 2.6 shows a network consisting of three SLC 500 programmablecontrollers and one host computer station.Figure 2.6Connecting to Multiple SLC 500s via the DH 485 NetworkLinkCoupler1747 AICSLC 500Controller1747 C11 CableDH 485 CableBelden #9842RS 232CCableLinkCoupler1747 AIC1747 C11 CableLinkCoupler1747 AICHost ComputerSLC 500ControllerSLC 500ControllerKF31747 C11 CableThis configuration requires the KF3 and three link couplers:one SLC 500 family controller is connected to each of the link couplerswith a 1747-C11 cablethe KF3 is connected to the network at one of the link couplersthe DH-485 cable consists of three segments of cable daisy-chained tothe link couplers and the KF3The connection between the first node (the KF3) and the link coupler to thesecond node is shown in Figure 2.7.2 5
Chapter 2Installing the KF3Figure 2.7Connection for First Segment of a Multidrop NetworkJumper to groundshield connectorDH 485CableJumper toterminate node1770 KF3 on one end of the linkLink coupler to first SLC 500* The black wire of the white/black pair should be cut back (no connection).The cable connecting the second and third nodes of the multidrop network(neither of which is an end station) is shown in Figure 2.8.Figure 2.8Connection Between Two Intermediate NodesTo Link 2FROMPREVIOUSDEVICERed/Black Pair* The black wire of the white/black pair should be cut back (no connection).The connection between the third and fourth (end) node is shown inFigure 2.9.2 6
Chapter 2Installing the KF3Figure 2.9Connection for Last Segment of a Multidrop NetworkDH 485CableJumper toterminate nodeThird nodeFourth node on the end of the multidrop network* The black wire of the white/black pair should be cut back (no connection).Installing the DH 485 CableThe DH-485 cable consists of a number of daisy-chained segments. Thetotal length of the combined segments must not exceed 4,000 feet. Cut thecable segments long enough to route from one node to the next, allowingsufficient slack to prevent strain on the connectors. Provide strain relieffor the cable after it is plugged in to prevent the cable wires from breaking.Figure 2.10Cable Connection on a DH 485 LinkBELDEN#9842BELDEN#9842ËËËËLinkCoupler1747 AICKF3LinkCoupler1747 AICConnector(Phoenix MSTB 2.5/6 ST AU)2 7
Chapter 2Installing the KF3RS 232C CablingConsiderationsCabling for the RS-232C connector of the KF3 will vary depending onyour application. The pinouts for this connector are given in Table 2.B.Table 2.BRS 232C Connector PinoutsSignalAbbreviationDirectionPin No.MeaningChassis Ground--1The cable shield must be connected to chassis ground at oneend only.Transmit DataTXDOutput2RS 232C serialized data output from the module.Receive DataRXDInput3RS 232C serialized data input to the module.Request to SendRTSOutput4A request from the module to the modem to prepare totransmit. With full duplex protocol, RTS is always asserted.With half duplex protocol, it is turned on when the module haspermission to transmit, otherwise it is off.Clear to SendCTSInput5A signal from the modem to the module that indicates thecarrier is stable and the modem is ready to transmit. Themodule will not transmit until CTS is on. If CTS is turned offduring transmission, the module will stop transmitting untilCTS is restored.Data Set ReadyDSRInput6A signal from the modem to the module that indicates thephone is off hook. It is the modem's answer to DTR. Themodule will not transmit or receive unless DSR is on. Ifthe modem does not control DSR properly, DSR must bejumpered to a high signal at the module. (It can be jumperedto DTR.)Signal GroundGND-7Signal ground - a reference point for the data signals.Data Carrier DetectDCDInput8A signal from the modem to the module to indicate that thecarrier from another modem is being sensed on the phoneline. It will not be asserted unless the phone is off hook.Data will not be received by the KF3 unless DCD is on. Withfull duplex protocol, the module will not transmit unless DCDis on. If the modem does not control DCD properly, DCD mustbe jumpered to DTR at the module.Data Terminal ReadyDTROutput20A signal from the module to the modem to connect to thephone line (i.e., pick up the phone"). The module will assertDTR all the time except during the phone hang up sequence.Modems built to North American standards will not respondto DTR until the phone rings. The KF3 module will not workcorrectly with modems which always pick up the phone uponreceiving DTR, whether
The DH-485 Communication Interface module links host computers with the Allen-Bradley RS-485 Data Highway (DH-485). The module supports the protocol required to act as a node on the DH-485 network, freeing the host computer from this task. Figure 1.1 The DH485 Communication Interface (1770KF3) Important: The DH
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