Allen-Bradley 1771-KRF/B User Manual
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Allen-Bradley 1771-KRF/B User Manual

Allen-Bradley 1771-KRF/B User Manual

Broadband communication interface
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Allen-Bradley
Broadband Communication
Interface
(Cat. No. 1771-KRF/B)
User's Manual

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Summary of Contents for Allen-Bradley 1771-KRF/B

  • Page 1 Allen-Bradley Broadband Communication Interface (Cat. No. 1771-KRF/B) User’s Manual...

  • Page 2: Table Of Contents

    Table of Contents Preface ........The Purpose of this Manual .

  • Page 3: Preface

    Preface Preface The Purpose of this Manual This manual shows you how to use the 1771-KRF/B Broadband Communications Interface. It provides information on: Configuring the DH/DH+ or remote I/O networks using the 1771-KRF/B Installing the KRF/B Troubleshooting the KRF/B WARNING: This equipment generates, uses, and can radiate...

  • Page 4: Audience

    Preface Audience You should read this manual before attempting to install the 1771-KRF/B. We assume you are already familiar with the following Allen-Bradley devices: Programmable Logic Controllers (PLCs) Data Highway and Data Highway Plus networks Remote I/O networks Data Highway and Data Highway Plus communication device(s) you are using to communicate through the 1771-KRF/B If you are not, refer to the appropriate documentation before you begin.

  • Page 5: Related Products

    Preface Related Products Allen-Bradley offers a wide range of interfaces for DH/DH+ and remote I/O networks, including: For this Product Order this Catalog Number DH/DH+ Asynchronous (RS 232 C or RS 422 A) Interface 1770 KF2 Module (Desk Top) DH PLC 2 Family Communication Adapter Module...

  • Page 6: Product Overview

    Chapter Product Overview Chapter Objectives In this chapter, you will read about: what the 1771-KRF is how the KRF operates on broadband compatible devices What is the 1771 KRF? The KRF is a module that lets DH, DH+, and remote I/O stations communicate over a broadband cable system.
  • Page 7 Chapter 1 Product Overview How the KRF Operates on A broadband communication system is an alternative way to connect Broadband communication equipment. Numerous separate networks share a single coaxial cable, eliminating separate wires for each network. Broadband cable systems use the same type of cable used in Community Access Television (CATV), which can cover large distances using standard CATV devices.
  • Page 8 Chapter 1 Product Overview The KRF module takes the signals from the DH/DH+ or remote I/O module as input and transmits them on the broadband cable. This allows the DH/DH+ and remote I/O protocol to be transmitted directly over the broadband link, creating a communication link on a broadband cable instead of on the traditional twinaxial baseband cable.

  • Page 9: Compatible Devices

    Chapter 1 Product Overview Compatible Devices The following Allen-Bradley devices have been tested and qualified with the 1771-KRF: Table 1.B 1771 KRF Qualified Modules Module Compatible Devices Data Highway 1785 KA (Data Highway port) 1771 KE/KF 1771 KA2 1774 KA...
  • Page 10 Allen-Bradley representative for assistance. Allen-Bradley will continue to test additional DH/DH+ and remote I/O interfaces and will update you as testing is completed. If you have any further questions about devices you wish to interface to...

  • Page 11: Guidelines For Connecting The 1771 Krf

    Chapter Guidelines for Connecting the 1771 KRF Chapter Objectives This chapter contains the following: what DH/DH+ networks are what a remote I/O network is network guidelines typical applications using the KRF Data Highway and Data Highway Data Highway and Data Highway Plus are local area networks that allow Plus Networks peer-to-peer communication between PLCs, computers, and other intelligent devices:...

  • Page 12: Remote I/O Networks

    Chapter 2 Guidelines for Connecting the 1771 KRF Remote I/O Networks A remote input and output (remote I/O) network is a local area network that supplies PLCs with digital and/or digitally encoded plant floor information. Remote I/O modules reside at some location other than the chassis that contains the master PLC processor.

  • Page 13: Network Guidelines

    Use the following guidelines when you want to add a DH/DH+ or remote I/O network to your broadband system: You need a channel translator (use the Allen-Bradley 6600 channel translator) at the head-end of the broadband cable system The 1771-KRF has been tested with a wide variety of DH/DH+ interface modules.
  • Page 14 Chapter 2 Guidelines for Connecting the 1771 KRF Data Highway on Broadband Configuration Broadband cable and modems replace daisy-chained twinaxial media and offer a greater distance between nodes, as well as multiple networks coexisting on one cable. Figure 2.1 shows a typical DH on broadband link configuration where KRFs create a single DH broadband link.
  • Page 15 Chapter 2 Guidelines for Connecting the 1771 KRF Data Highway Plus on Broadband Configuration Broadband cable and modems now replace daisy-chained twinaxial media and offer a greater distance between nodes as well as multiple networks coexisting on one cable. Figure 2.2 shows a typical DH+ on broadband configuration where KRFs create a single DH+ link.
  • Page 16 Chapter 2 Guidelines for Connecting the 1771 KRF Data Highway Broadband Backbone/Data Highway Plus Subnet Configuration Broadband cable and modems now replace daisy-chained twinaxial media and offer a greater distance between nodes as well as multiple networks coexisting on one cable. The 1785-KA is typically used to link DH+ baseband subnetworks over a DH backbone.
  • Page 17 Chapter 2 Guidelines for Connecting the 1771 KRF We recommend this configuration to optimize overall system performance by minimizing the number of nodes on each of the DH+ subnetworks. This configuration also optimizes overall system performance by isolating local traffic to the individual DH+ subnetworks. The DH protocol is used on the broadband backbone.
  • Page 18 Chapter 2 Guidelines for Connecting the 1771 KRF Figure 2.5 Remote I/O on broadband link using the PLC 2 Programmable Controller PLC 2 1771 SD2 baseband cable remote I/O on broadband Translator 1771 ASB 1771 ASB 1771 ASB 1771 ASB 17884 Figure 2.6 Remote I/O broadband link using the PLC 3 Programmable Controller...
  • Page 19 Chapter 2 Guidelines for Connecting the 1771 KRF Table 2.C 1771 KRF Configurations for PLC 5, PLC 3, and PLC 2 Programmable Controllers Use these devices To connect these devices to the remote I/O broadband link 1771 KRF and built in remote I/O port of PLC 5 the PLC 5 1771 KRF and 1771 ASB adapter...

  • Page 20: Selecting Channels And Setting Switches

    Chapter Selecting Channels and Setting Switches Chapter Objectives In this chapter, you read about: available channels for the KRF setting the option switches on the KRF Available Channels for 1771 KRF The KRF module is frequency agile, which means you can change the Module operating subchannel as your application requires.
  • Page 21 Chapter 3 Selecting Channels and Setting Switches The KRF operates on one of 18 750 KHz subchannels within three 6 MHz channels. Table 3.B shows the six subchannels available within each channel: Table 3.B KRF subchannels For this Channel Pair Use these Subchannels And this Allen Bradley Translator T12 to L...
  • Page 22 Chapter 3 Selecting Channels and Setting Switches Locate the switch assembly on the KRF in figure 3.1. Figure 3.1 KRF option switches Side of module Option switch location Down 17274...
  • Page 23 Chapter 3 Selecting Channels and Setting Switches Use switches SW-1 through SW-5 to set a unique subchannel address (1-6, 9-14, 17-22) for all KRFs sharing a common link. The figure below shows the KRF switch assembly; Table 3.C shows the switch settings for each subchannel address.
  • Page 24 Chapter 3 Selecting Channels and Setting Switches Table 3.C Setting switches for KRF subchannel addresses Subchannel SW 1 SW 2 SW 3 SW 4 SW 5 Do not use DOWN DOWN DOWN DOWN DOWN DOWN DOWN DOWN DOWN DOWN DOWN DOWN DOWN DOWN...
  • Page 25 242.625 T14/N 51.125 243.375 T14/N 58.875 244.125 T14/N 52.625 244.875 T14/N Do not use 53.375 245.625 T14/N Important: The 1771-KRF and Allen-Bradley 6608 19.2 KB Frequency Agile Modems can be installed on the same 6-MHz channel (L, M, or N)
  • Page 26 Chapter 3 Selecting Channels and Setting Switches using the same channel translator. However, you must leave a 100 KHz (.1 MHz) guardband between the subchannel(s) you select for the 1771-KRF and the subchannel(s) you select for the 6608 modems. See Appendix B “Using the 1771-KRF with 6608 Modems”...

  • Page 27: Installing And Connecting The 1771 Krf

    KRF troubleshoot the KRF Mounting the KRF To mount the KRF in an Allen-Bradley 1771 I/O chassis, follow the instructions below: Perform a power down of the I/O chassis and its controlling PLC (refer to your PLC User’s Manual for more information).

  • Page 28: Connecting The Krf To Dh/Dh+ Or Remote I/O Modules

    Chapter 4 Installing and Connecting the 1771 KRF Connecting the KRF to DH/DH+ Connect your KRF to: or Remote I/O Modules the DH/DH+ or remote I/O port of the module you wish to connect to the broadband system the drop cable of the broadband cable system you are using for the DH/DH+ or remote I/O broadband link For more information on these connections, refer to the appropriate user’s manual.
  • Page 29 Chapter 4 Installing and Connecting the 1771 KRF To connect your KRF module to the port of the module you wish to connect to the broadband cable system: Use a short length (as short as possible, 100 ft maximum) of twinaxial cable to run between the 1771-KRF and the module (Typically, the KRF is mounted next to the DH/DH+ or reomte I/O module in the 1771 I/O chassis.)
  • Page 30 Chapter 4 Installing and Connecting the 1771 KRF Figure 4.3 Connecting to a DH/DH+ module with a 9 pin connector 9 - pin male connector Clear Clear Shield Shield 150W resistor Blue Blue required. DH/DH+ 1771 - KRF Twinaxial Cable Communication (cat.
  • Page 31 Chapter 4 Installing and Connecting the 1771 KRF Figure 4.6 Connecting to a 1784 KT with a 62 pin connector Industrial terminal end 150W resistor is terminated internally. Clear Clear Shield Shield Blue Blue 1771 - KRF Twinaxial Cable (cat. no. 1770-CD) 17281 1784 -KT.
  • Page 32 Chapter 4 Installing and Connecting the 1771 KRF Figure 4.8 Connecting to the PLC 5 I/O channel (Series 1784 LT scanner and 1784 LT adapter) The PLC - 5 processor has an Clear Blue on - board switch - selectable terminator.
  • Page 33 Chapter 4 Installing and Connecting the 1771 KRF Figure 4.10 Connecting to the 1771 DCM remote I/O adapter Clear Clear Line 2 Install a Shield Shield 150 ohm Shield Blue Blue 1/2 watt resistor Line 1 1771 - KRF Line 2 Twinaxial Cable Shield (cat.
  • Page 34 Chapter 4 Installing and Connecting the 1771 KRF Figure 4.12 Connecting to the 2705 Ready Panel Clear Clear Line 2 Shield Shield 150W Shield resistor Blue Blue required. Line 1 2705 1771 - KRF Twinaxial Cable Ready Panel (cat. no. 1770-CD) 17910 Figure 4.13 Connecting to the 1772 SD2 remote I/O scanner...
  • Page 35 You can also order the RG 6 Drop Cable Kit (cat. no. 6615 DCK) to construct your own cables. Important: If you do not use Allen-Bradley cables, make sure your cables: are 75 ohm, RG-6 cables to reduce electrical interference have an “F”...
  • Page 36 Chapter 4 Installing and Connecting the 1771 KRF Attach the other end of the drop cable to the broadband interface female “F” connector as shown below: 1771– KRF BROADBAND broadband 17283 Important: For best results, tighten the drop cable connection with a wrench until snug.

  • Page 37: Powering Up The 1771 Krf

    Chapter 4 Installing and Connecting the 1771 KRF Powering Up the 1771 KRF After you have successfully: set the switch assemblies on the KRF mounted your KRF in a 1771 I/O chassis connected the KRF to the DH/DH+ or remote I/O module and your broadband cable system you can power up the KRF module.
  • Page 38 (C) KRF frequency synthesizer out of lock No fault has been detected Allen-Bradley power supplies have a reset signal that is transmitted on the backplane of the I/O chassis. If the module does not receive this signal, it will not power-up correctly. Check to see if there is an I/O adapter module or backplane jumper board (cat.
  • Page 39 Chapter 4 Installing and Connecting the 1771 KRF Once you have established that the broadband cable system is operating correctly, you can use the KRF and corresponding DH/DH+ or remote I/O module LEDs to troubleshoot a local problem at the KRF. Important: Be certain messages are being sent over the DH/DH+ or remote I/O network.

  • Page 40: Specifications

    Appendix Specifications Location single slot in I/O chassis Communication Ports DH/DH+ and remote I/O baseband: 3 screw terminal block Broadband: female type F connector Communication Rate 57.6 and 115.2K baud Cabling DH/DH+ and Remote I/O port: Twinaxial Baseband Belden 9463 Broadband port: 75 ohm, RG 6 coaxial Power Requirement 1.5 amps @ 5VDC...

  • Page 41: Using The 1771 Krf With 6608 Modems

    Appendix Using the 1771 KRF with 6608 Modems Important: You can install the KRF and Allen-Bradley 6608 19.2KB frequency agile modems on the same 6 MHz channel (L, M or N) using the same channel translator. However, you must leave a 100 KHz (.1 MHz) guardband between the subchannel(s) you select for the KRF...
  • Page 42 Index Symbols mounting, option switches, **Empty**, option switches, setting the, powering up, 4 11 specifications, subchannels, available frequencies and channel Broadband pairs for KRF subchannels, Broadband/KRF possible interfaces, Connecting the KRF to, restricted, How KRF operates on, setting switches for KRF subchannel addresses, switch assembly, troubleshooting KRF local problems,...
  • Page 43 LATIN AMERICA HEADQUARTERS MIDDLE EAST/AFRICA HEADQUARTERS HEADQUARTERS HEADQUARTERS 1201 South Second Street HEADQUARTERS Allen-Bradley (Hong Kong) Allen-Bradley Canada Limited 1201 South Second Street Milwaukee, WI 53204 USA Allen-Bradley Europa B.V. Limited 135 Dundas Street Milwaukee, WI 53204 USA Tel: (414)382-2000...

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