Installation Instructions ControlNet Fiber Media Planning and Installation Guide Catalog Number 1786 Series
Important User Information Solid-state equipment has operational characteristics differing from those of electromechanical equipment. Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls (publication SGI-1.1 available from your local Rockwell Automation® sales office or online at http://www.rockwellautomation.com/literature/) describes some important differences between solid-state equipment and hard-wired electromechanical devices.
Summary of Changes This manual contains new and updated information. Changes throughout this revision are marked by change bars, as shown to the right of this paragraph. New and Updated Information This table contains the changes made to this revision.
Summary of Changes Notes: 4 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011
Table of Contents Preface Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Chapter 1 Get Started with the ControlNet Why Choose a Fiber-optic Media System?. . . . . . . . . . . . . . . . . . . . . . . . . . 11 Analyze Your Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Network Fiber Media System Identify Fiber Media Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents Determine Propagation Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Maximum Propagation Delay Through a Network . . . . . . . . . . . . . . 39 Maximum Propagation Delay and Skew Through a Redundant Network. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Chapter 3 Guidelines for Fiber-optic Installation General Rules and Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Warnings . . . . . . .
Table of Contents Appendix B Status Indicators 1786-RPFS and 1786-RPFM Status Indicators. . . . . . . . . . . . . . . . . . 76 1786-RPFRL/B or 1786-RPFRXL/B Status Indicators . . . . . . . . . . 77 1786-RPFRL/B or 1786-RPFRXL/B Relay Contact Connectors. 78 Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents Notes: 8 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011
Preface This guide provides basic information for fiber cable planning and installation. Actual procedures for installing your system may vary depending on cable style and installation environment. We recommend that you consult a network design specialist for the design of your fiber network. Refer to the Glossary for clarification of terms associated with fiber technologies.
Preface Notes: 10 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011
Chapter 1 Get Started with the ControlNet Network Fiber Media System Topic Page Why Choose a Fiber-optic Media System? 11 Analyze Your Network 12 Identify Fiber Media Components 12 Determine Network Topology 15 Plan the Installation of the Fiber Media Components 19 Choose the Fiber Media System Composition 19 Configure the Media in RSNetWorx for ControlNet Software 25 Terminate Your Fiber Cable 26 Test Your Fiber Media Connections and Segments 26 Power Your Repeaters 26 Verify Your
Chapter 1 Get Started with the ControlNet Network Fiber Media System . Table 1 - Fiber Media Advantages Analyze Your Network Features Benefits Electrical isolation Fiber media is isolated from any potential electrical sources that cause disruptions on copper media. Fiber media is well-suited for installations between buildings, and provides immunity to lightning strikes. Immunity to interference Fiber media is immune to EMI (electromagnetic interference) since it uses light pulses on glass fibers.
Get Started with the ControlNet Network Fiber Media System Chapter 1 Fiber-optic Cable Fiber-optic cables consist of three major components, the buffer and coating, cladding, and the core. Figure 1 - Fiber-optic Cable Components Core Cladding Coating Buffer Table 2 - Fiber-optic Cable Description Parts Description Buffer and coating The buffer and coating are the material that surround the glass fiber. They are responsible for protecting the fiber strands from physical damage.
Chapter 1 Get Started with the ControlNet Network Fiber Media System Repeater Modules There are two types of repeater modules: coax repeater (catalog number 1786-RPCD) and fiber repeaters (catalog numbers 1786-RPFS, 1786-RPFM, 1786-RPFRL/B, and 1786-RPFRXL/B). Although you can repeat coax signals on a network by using a 1786-RPCD module, this manual mainly focuses on fiber cabling for the fiber repeater modules.
Get Started with the ControlNet Network Fiber Media System Determine Network Topology Item Chapter 1 We suggest that you take sufficient time to plan the installation of your network before assembling any components. The table defines some of the basic ControlNet network terminology used in example topologies. Term Description Item T Passive tap with drop cable The connection between any device and the cable system. The length of the drop cable is 1 m (3.28 ft).
Chapter 1 Get Started with the ControlNet Network Fiber Media System You can configure these topologies on a ControlNet network: • Point-to-Point Topology • Star Topology • Ring Topology Point-to-Point Topology Point-to-point is also called a bus or a trunk line topology. A point-to-point topology can be described as one fiber module transmitting to another module. For example, you cannot transmit from a medium-distance module to a short-distance module.
Get Started with the ControlNet Network Fiber Media System Chapter 1 Star Topology In a star topology, all segments of the fiber network start from a central location.
Chapter 1 Get Started with the ControlNet Network Fiber Media System Ring Topology A ring topology provides redundancy by providing two data paths in a single ring. A ring can sustain two faults before that data connection is lost. You should consider a ring when your devices (Controller and I/O) are single port (A only) and media redundancy is required. Only the 1786-RPFRL and 1786-RPFRXL repeater modules support ring topologies.
Get Started with the ControlNet Network Fiber Media System Plan the Installation of the Fiber Media Components Chapter 1 During the planning phase of your network design, create checklists to help you determine the following components that are needed in an application: • Number of nodes in your network TIP In a network containing a fiber repeater module, such as a 1786-RPFRL/B or 1786-RPFRXL/B module, you cannot have more than 98 node addresses assigned.
Chapter 1 Get Started with the ControlNet Network Fiber Media System You can use fiber repeaters for these tasks: • Extend the total length of your segment (point-to-point or trunk line topology) • Create star and ring configurations (multiple directions from one point) • Cross into hazardous areas ATTENTION: In hazardous areas, you must use products specifically designed for that purpose.
Get Started with the ControlNet Network Fiber Media System Chapter 1 Install Repeaters in a Series Series is defined as the number of repeater assemblies (repeater adapter plus fiber repeater module) between two devices on a network . When you install fiber repeaters in a series, use the RSNetWorx™ for ControlNet™ software to verify that the system is an allowable configuration.
Chapter 1 Get Started with the ControlNet Network Fiber 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 250 m segment). Figure 6 shows an example of fiber repeaters being used in parallel.
Get Started with the ControlNet Network Fiber Media System Chapter 1 Install Repeaters in a Combination of Series And Parallel You can install repeaters in a combination of series and parallel connections. For mixed topologies (series and parallel) the maximum number of repeaters in series between any two nodes is 20. • If you configure your network by using repeaters in combination of series and parallel, you need to count the repeaters in series on the worst-case path between any two nodes.
Chapter 1 Get Started with the ControlNet Network Fiber Media System Install Repeaters in a Ring Use this configuration to achieve an increased level of protection (in case of cable failure) over a long distance (not available when you use traditional copper media). To achieve this increased level of protection, a fiber ring network transmits messages in the two directions of the ring (clockwise and counter-clockwise).
Get Started with the ControlNet Network Fiber Media System Chapter 1 A fiber-optic ring may contain up to 20 1786-RPFRL/B (long distance) or 1786-RPFRXL/B (extra-long distance) fiber repeaters, depending on the application. IMPORTANT Configure the Media in RSNetWorx for ControlNet Software When used in a ring topology, redundant coaxial cabling (linear bus) or redundant rings are not allowed. Due to timing differences, the 1786-RPFRXL/B and 1786-RPFRL/B fiber modules do not support redundant rings.
Chapter 1 Get Started with the ControlNet Network Fiber Media System Terminate Your Fiber Cable Be sure to use the correct connectors on the end of your fiber cable for the best optical and mechanical connections. For example, ST- and V-pin are the only two connectors that the ControlNet network recognizes. See Table 8 on page 54 for more information on available connector kits for repeater modules.
Chapter 2 Topology and Signal Considerations Develop a Plan Topic Page Develop a Plan 27 Redundant Media 28 Topology Considerations 29 Coax Segment Constraints 30 Fiber Segment Constraints 31 Select a Module Type Based on Distance Requirements 31 Estimate Cable Lengths 33 Determine Attenuation Levels 35 Determine Propagation Delay 38 Fiber-optic links in a ControlNet network system can do the following: • Increase network length beyond that supported by coax • Provide immunity to EMI
Chapter 2 Topology and Signal Considerations Figure 9 - Basic Fiber Media Topology Tap Coax Segment 1 Fiber Repeater Module Repeater Adapter Repeater Adapter Fiber Cable Fiber Repeater Module Coax Segment 2 Terminator 30688-M This configuration is equivalent to the use of a coax repeater. Fiber cable can provide communication over longer distances than coax media. Redundant Media Use redundant media when you need module and media redundancy.
Topology and Signal Considerations Chapter 2 For redundancy, you should do the following on each channel: • Use the same number and types of repeater assemblies (repeater adapters plus repeater modules) • Use the same type of cable • Keep cable lengths similar • If using redundant media in a linear bus topology, ring topologies are not supported. Figure 10 - Redundant Topology 31420-M Topology Considerations For best results, determine the constraints of your topology.
Chapter 2 Topology and Signal Considerations Coax Segment Constraints The total allowable length of a segment containing standard RG-6 quad shield coaxial 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 1,000 m (3280 ft) with two taps connected. Each additional tap decreases the maximum length of the segment by 16.3 m (53 ft).
Topology and Signal Considerations Fiber Segment Constraints Every network that uses fiber repeaters must maintain a minimum signal level for each fiber segment in order to achieve an effective signal strength. Attenuation of a fiber segment is effected by the quality of the termination at each connector, splices, bulkheads, and the fiber cable. At any time, the total amount of attenuation shall not exceed the power budget of the type of repeater module that is being used.
Chapter 2 Topology and Signal Considerations Duplex Cable A duplex cable is made up of two jacketed fiber cores, with their jackets fused together to form a single cable. A duplex cable is sometimes called a zipcord fiber jumper. 31507-M Smaller lengths of simplex and duplex interconnect cable are typically directly connected between modules, or to a fiber panel within an enclosure. Multi-fiber Backbone Cable Multi-fiber backbone cable is composed of many fiber cores bundled into a jacketed cable.
Topology and Signal Considerations Estimate Cable Lengths Chapter 2 The maximum length of a fiber cable section for the fiber-optic modules is dependent on the quality of the fiber, number of splices, and the number of connectors. If your distance requirements are less than 300 m, you can use a short-distance (single-mode) cable that comes pre-terminated for use with the 1786-RPFS fiber module.
Chapter 2 Topology and Signal Considerations 1786-RPFS Module The 1786-RPFS (0…300 m) module specializes in solving short-distance applications. This system requires the use of pre-terminated cable assemblies. The total attenuation for a fiber cable section must be less than 4.2 dB. 200/230 Micron HCS (hard-clad silica) Fiber Use 200 micron HSC cable with the 1786-RPFS module for short-distance applications. The 200 hcs cable is also known as a step index multi-mode type of fiber cable.
Topology and Signal Considerations Chapter 2 1786-RPFRXL/B (Fiber Ring or Point-to-Point) Module The 1786-RPFRXL (0…20 km) module is designed to solve extra-long distance applications that require up to 20,000 m (65,620 ft) for single-mode fiber between two ControlNet network devices. You must terminate extra longdistance cable in the field. The maximum length of a section is dependent on the quality of the fiber, number of splices, and the number of connectors.
Chapter 2 Topology and Signal Considerations You can also affect the power budget by the quality of the connectors and fiber cable you choose. If you use a high-quality connector and fiber cable, you will be able to stretch your power budgets. Higher-quality connectors and cable can withstand a broader range of temperatures and distances. In most situations you will not have to determine the attenuation levels for short-distance fiber cable.
Topology and Signal Considerations Chapter 2 Step 3: Subtract loss for cable lengths Select fiber cable and identify loss = length of cable x (loss due to fiber cable/km) Measured @ .1 dB Step 4: Compare losses Compare the sum of losses in steps 2 and 3, with total power budget in step 1. 4.2 dB - 3 dB - .1 dB = 1.1 dB If the sum of steps 2 and 3 are equal to or less than step 1 (which applies for our example), then you are within the power budget.
Chapter 2 Topology and Signal Considerations Attenuation Levels for Long-distance Fiber Segments The power loss budget for the long-distance fiber repeater (catalog number 1786-RPFRL) is 15 dB. The maximum amount of attenuation between the two fiber repeaters shall not exceed 15 dB. This power loss budget includes the entire bulkhead/fusion splice. Attenuation Levels for an Extra-long Fiber Segment The power loss budget for the extra-long distance fiber repeater (catalog number 1786-RPFRXL) is 10.5 dB.
Topology and Signal Considerations Chapter 2 Maximum Propagation Delay Through a Network Figure 13 is an example of a maximum propagation delay through a network. Figure 13 - . Calculating the Delays Delay 2 Delay 4 Delay 6 Delay 5 Delay 3 Delay 1 750 m 1000 m Delay 8 Delay 7 3000 m Node 3 100 m Node 2 Node 1 Channel A Delay 9 20 m 20 m 31417-M The example has the following maximum delay path from node 1 to node 2, end to end.
Chapter 2 Topology and Signal Considerations Delay Path 5: 3000 m of 62.5 micron fiber cable Delay 5: 3000 m fiber cable x 5.01 ns/m = 15030 ns Delay Path 6: Fiber modules; 1786-RPFM, 1786-RPA/B, 1786-RPFS modules Delay 6: 153 ns (1786-RPFM module) + 901ns (1786-RPA/B module) + 94 ns (1786-RPFS module) = 1148 ns Delay Path 7: 100 m of 200 micron fiber cable Delay 7: 100 m fiber cable x 5.
Topology and Signal Considerations Chapter 2 Figure 14 - Maximum Propagation Delay Through a Redundant Network Delay 2 Delay 4 Delay 3 Delay 1 1000 m Delay 6 Delay 8 Delay 5 Delay 7 3500 m 100 m 500 m Node 2 Channel A Node 1 Delay 2 Channel B Delay 1 750 m Node 3 Delay 9 20 m 20 m Delay 4 Delay 3 Delay 6 Delay 8 Delay 5 Delay 7 3200 m 100 m 1000 m Node 3 Node 2 Delay 9 20 m 20 m 31417-M Calculate and Total Delays for Channel A Delay 1 500 m coax cable x 4.17 ns/m = 2.
Chapter 2 Topology and Signal Considerations Delay 8 Fiber modules; 94 ns + 901 ns = 0.995 μs Delay 9 20 m coax cable x 4.17 ns/m = 0.083 μs Total delay for Channel A = 28.57 μs Calculate and Total the Delays for Channel B Delay 1 750 m coax cable x 4.17 ns/m = 3.127 μs Delay 2 Coax repeater; 901 ns + 100 ns = 1.001 μs Delay 3 1000 m coax cable x 4.17 ns/m = 4.17 μs Delay 4 Fiber repeater; 901 ns + 153 ns = 1.054 μs Delay 5 3200 m fiber cable x 5.01 ns/m = 16.
Chapter 3 Guidelines for Fiber-optic Installation General Rules and Safety Warnings Topic Page General Rules and Safety 43 Warnings 43 Types of Fiber Media Installations 45 This section outlines specific rules and guidelines to follow when you install fiber-optic cable systems. ATTENTION: Follow these safety guidelines: Safety glasses are required to protect your eyes when you handle chemicals and cut fiber. Pieces of glass fiber are very sharp and can easily damage the cornea of your eye.
Chapter 3 Guidelines for Fiber-optic Installation Single- and multi-mode pre-terminated fiber cables for medium, long, and extra-long distances also can be purchased that are made to order or off the shelf from your supplier. However, keep in mind that a fiber media installation must be certified and terminating longer distances in the field can be challenging. Trained specialists can select the correct type of fiber cable for your environmental and intrinsically safe area needs.
Guidelines for Fiber-optic Installation Chapter 3 Table 7 - Guidelines for Handling Fiber-optic Cable Guideline Description Proper disposal • Always dispose of fiber waste in an approved container. Disposing of fiber waste prevents the contamination of clothes, fingers, or eyes of glass fragments. Do not leave pieces of fiber cable on your work surfaces. Specifications • Review cable specifications for distances and required connectors.
Chapter 3 Guidelines for Fiber-optic Installation Indirect Attachment Indirect attachment uses a pulling grip attached to the cable’s outer jacket to distribute the pulling force over the outer portion of the cable. The pulling grip produces the least amount of stress in cables where the strength member lies directly beneath the jacket. Conduit and Duct Installation Installation procedures for conduit and duct installation of fiber-optic cables are very similar to those of electrical wires.
Guidelines for Fiber-optic Installation Chapter 3 5. Maintain enough slack on the cable as the pull starts to prevent the cable from contacting any equipment in the area. IMPORTANT Do not allow slack loops to form on the reel. Slack loops could cause a crossover and damage the cable. Always pull at slow speeds to limit the possibility of crossovers. Plan your pull to avoid a pull equaling or exceeding the total bends to 360° per pull.
Chapter 3 Guidelines for Fiber-optic Installation Aerial Installation Most round, tight buffer, and loose-tube optical cables are compatible with helical lashing, clamping, and tied mounting. These cables can be used in aerial installations by using methods similar to those for electrical cables. The following procedure describes the stationary method for aerial cable installation.
Guidelines for Fiber-optic Installation Chapter 3 7. Place a one-sheave cable block or snatch block within 0.3 m (1 ft) of the pole at the end of the pull. Make sure the winch is positioned to avoid steep angles exiting the block. 8. Thread the towline through the all of the cable blocks and the cable guide to the end of the cable for aerial placement. 9. Attach the towline to the cable by using direct or indirect attachment as your application dictates. 10.
Chapter 3 Guidelines for Fiber-optic Installation Direct Burial Installation Some applications call for a direct burial installation. Direct burial installation requires some special considerations that aren’t necessary for other pulled applications. These guidelines are designed to prevent hazards such as freezing water, crushing forces, ground disruption from construction, and rodents. Use the following guidelines to help you plan your direct burial installation.
Guidelines for Fiber-optic Installation Chapter 3 5. Use the following procedure if you must start cable placement in the middle of a selected trenching route. a. Pull in the first direction until the end point is reached. b. Remove the cable for the opposite direction from the reel by hand and carefully coil it on the ground in a figure-8 pattern. IMPORTANT Be certain to place the cable in a manner that will prevent the cable from binding against foliage, rocks, or other impediments. c.
Chapter 3 Guidelines for Fiber-optic Installation Vertical Installation The requirements of your application may require a vertical installation. You can install fiber-optic cable vertically in trays, shafts, or towers. Dielectric cables are recommended for applications requiring high vertical installations, radio towers for example. Use the following guidelines when planning a vertical cable installation. 1. Clamp cable to give extra support in preventing ice loading and wind slapping.
Chapter 4 Terminate Your Fiber-optic Cable What Is Termination? Topic Page What Is Termination? 53 Terminate Your Cable 54 Termination is the process of attaching a connector to the ends of your fiber cable. Use protective caps on the ends of unused connectors. Follow these additional recommendations to terminate your fiber cable: • Decide on the type of cable dressing based on the fiber cable construction (for example, loose tube, zipcord, simplex, and so forth) See page 31 for more information.
Chapter 4 Terminate Your Fiber-optic Cable Terminate Your Cable Most connector manufactures offer connector termination systems that are specific to the connector. We recommend that the termination kit be purchased from the same manufacture. There are two types of connector systems in the market: • One common type is fast termination where the cable end is prepared and inserted into the back end of the connector. The system then locks the cable and fiber in place.
Chapter 5 Verify Your Network Set Network Parameters Topic Page Set Network Parameters 55 Measure Power Loss 55 OTDR Measurement 57 You can use RSNetWorx for ControlNet software to determine if network parameters are set up correctly. Based on the system parameters you entered, such as, NUT, SMAX, UMAX, and worst-case network delay, RSNetWorx software calculates scheduled messaging for your network. If your network is not valid, you must adjust your parameters.
Chapter 5 Verify Your Network Do not test the cable with the wrong power source because you will get inaccurate readings. The power budgets are at the source wavelengths. Table 9 - Fiber Operation Wavelengths Module Wavelength 1786-RPFS 650 nm 1786-RPFM 1300 nm 1786-RPFRL/B 1786-RPFRXL/B Verify each segment length by using an optical time domain reflectometer (OTDR) field tester or by using the markings on the cable jacket. See page 57 for more information.
Verify Your Network Chapter 5 Considerable power loss in your cable could be a result of the following conditions: • Poor splices • Improper bend radius • Bending losses • Broken fibers • Poor connections • Contaminated or damaged connectors • High fiber bend radius • Poorly polished connector OTDR Measurement In addition to power loss measurement, you should examine your total fiber network by using an optical time domain reflectometer (OTDR).
Chapter 5 Verify Your Network Notes: 58 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011
Appendix A Install Your Fiber Repeater Modules and Repeater Adapters Installation Guidelines Topic Page Installation Guidelines 59 Mount the Fiber Module 60 Connect a 1786-RPFS Module 65 Connect Fiber Repeater Modules 66 Wire a Repeater Adapter Module 68 Troubleshoot the Module 69 Specifications for Fiber-optic Cable 70 Use these guidelines when you install your fiber repeater modules and repeater adapters.
Appendix A Install Your Fiber Repeater Modules and Repeater Adapters • Allow a minimum of 5 cm from surrounding equipment for proper ventilation. • To maintain proper ventilation, do not mount the repeater modules upside down. TIP Horizontal mounting is preferred. Vertical mounting is allowed. We recommend that the 1786-RPA/B module be mounted at the top if vertical mounting is chosen. • Use zinc-plated yellow-chromate-steel DIN rails to prevent corrosion.
Install Your Fiber Repeater Modules and Repeater Adapters Appendix A The locking tab should snap into position and lock the module to the DIN rail. 42543 TIP Use a screwdriver to move the locking tab downward, if the module is not secured. WARNING: Removal and insertion under power (RIUP) is not supported. These modules must be powered down while connecting and disconnecting them from any interconnected modules.
Appendix A Install Your Fiber Repeater Modules and Repeater Adapters ATTENTION: Do not discard the end cap. Use this end cap to cover the exposed interconnections on the last module on the DIN rail. Failure to do so could result in equipment damage. 5. If applicable, slide the module to the left to mate with the repeater adapter or another repeater module. 30077 IMPORTANT Make certain that you secure the repeater adapter and repeater modules with DIN-rail anchors.
Install Your Fiber Repeater Modules and Repeater Adapters Appendix A 2. Use the key supplied with the ferrite to open it. Loop the wire around the ferrite. Twist the wires. 31530 3. Twist the wires, but be careful not to damage them. 4. Form a loop with both wires (+ and -) approximately 100 mm (4 in.) away from the power supply connector of the 1786-RPA/B module. 5. Loop the wires through the ferrite. 6. Close the ferrite. Be careful not to damage the wires. 7. Strip approximately 6 mm (0.24 in.
Appendix A Install Your Fiber Repeater Modules and Repeater Adapters 3. Loop the wires through the ferrite. 4. Close the ferrite. Be careful not to damage the wires. 5. Strip approximately 6 mm (0.24 in.) of wire from the end that will connect to the relay contact connector on the 1786-RPFRL/B or 1786-RPFRXL/B module. 6. Remove the relay contact connector from the 1786-RPFRL/B or 1786-RPFRXL/B module. 7.
Install Your Fiber Repeater Modules and Repeater Adapters Connect a 1786-RPFS Module Appendix A The 1786-RPFS module requires a pre-terminated zipcord wiring kit. The kits are offered in a variety of lengths. Consult with your local distributor for attenuation specifications before you purchase your fiber media components. The zipcord uses a duplex cable that contains two separate fibers, one for transmit and one for receive. If you are wiring only one channel, you can use either channel 1 or channel 2.
Appendix A Install Your Fiber Repeater Modules and Repeater Adapters Connect Fiber Repeater Modules This section describes how to connect cables for fiber repeater modules (other than the 1786-RPFS; see page 65). A tracer on a duplex cable helps to identify and follow the cable throughout your system.
Install Your Fiber Repeater Modules and Repeater Adapters Appendix A 4. At the second module, connect the cables in reverse. For example, tracer to TX port on module 1, non-tracer to RX port on module 1: tracer to RX port on module 2, non-tracer to TX port on module 2. ATTENTION: Do not look directly into the optical port to avoid damage to your eyes. Terminate the Cable Termination is the process of attaching connectors to the ends of fiber cable.
Appendix A Install Your Fiber Repeater Modules and Repeater Adapters Wire a Repeater Adapter Module This section describes how to wire a repeater adapter module. WARNING: An electrical arc can occur under these circumstances: - When you connect or disconnect the removable terminal block (RTB) with field side power applied - If you connect or disconnect the communication cable with power applied to this module or any device on the network This could cause an explosion in hazardous location installations.
Install Your Fiber Repeater Modules and Repeater Adapters Appendix A 5. Connect the repeater adapter module to the ControlNet network by connecting the drop line of the coax tap to the BNC connector. BNC Connector 31459-M 6. Terminate any unused coax ports by connecting a 75 Ω terminator to the unused BNC connector. One 75 Ω terminator is shipped with the repeater adapter module.
Appendix A Install Your Fiber Repeater Modules and Repeater Adapters Specifications for Fiber-optic Cable The quality of the fiber cable determines the distance you can achieve. Consult your your local distributor for attenuation specifications prior to purchasing your fiber media components.
Install Your Fiber Repeater Modules and Repeater Adapters Appendix A 1786-RPFRXL/B Fiber-optic Cable Item Description Fiber type 62.5/125 µm micron multi-mode 9/125 µm micron single-mode Fiber termination type ST (plastic or ceramic only; do not use metal connectors) Fiber operating wavelength 1300 nm Optical power budget 10.5 dB(1) (1) This includes all loss associated with the fiber link, including splices, fiber attenuation, bulkhead connectors, and the ST terminations.
Appendix A Install Your Fiber Repeater Modules and Repeater Adapters Notes: 72 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011
Appendix B Status Indicators The 1786-RPA/B repeater adapter has a pair of status indicators: • One status indicator for the condition of the coax connection • One status indicator for the accumulative indications of fiber channels The status indicators on the repeater adapter module can be interpreted alone or together.
Appendix B Status Indicators Table 10 - Power-up and Fault Conditions Indicator Status Description Repeater adapter Alternating red/green Repeater adapter module is being powered up or reset. Do nothing. The repeater adapter module is operating properly. Solid red A jabber condition has occurred. Another node or repeater on the network is transmitting constantly. Check the network and components for proper operation. Off Repeater adapter module is not powered up or has failed.
Status Indicators Appendix B Table 12 - Repeater Modules Status Indicator Indicator Status Description Repeater module Solid green Error-free data is being recovered at all of the attached repeater modules. Do nothing. This is the normal operating mode. Flashing green/off Data with errors is occasionally being recovered at some or all of the repeater modules. This situation normally corrects itself. If the situation persists, check the following: • All BNC connector pins are seated properly.
Appendix B Status Indicators 1786-RPFS and 1786-RPFM Status Indicators Use the channel 1 or 2 status indicators to check module status. Channel 1 Status Indicator Channel 2 Status Indicator 30041 Table 13 - Short- or Medium-distance Fiber Repeater Modules 76 Indicator Status Description Either channel 1 or channel 2 Off Repeater not connected to power supply. Green Channel is operating normally. Flashing green No activity on the channel.
Status Indicators Appendix B 1786-RPFRL/B or 1786-RPFRXL/B Status Indicators Use the channel 1 or 2 status indicators to check module status. Channel 1 Status Indicator Channel 2 Status Indicator 45792 Table 14 - Long- or Extra-long Fiber Repeater Modules Indicator Status Description Repeater module Off Fiber repeater module is not connected to the power supply. Connect the repeater to the power supply. Green The fiber repeater module is operating properly.
Appendix B Status Indicators Table 14 - Long- or Extra-long Fiber Repeater Modules Indicator Status Description Repeater module Red Excessive receive signal distortion. Review these items: • Be certain that you are using the correct fiber type for your module. • Check fiber length and attenuation to make sure that it is within specification. • Replace the downstream 1786-RPFRL module on the channel that has the intermittently flashing red status indicator.
Glossary The following terms and abbreviations are used throughout this manual. For definitions of terms not listed here, refer to the Allen-Bradley Industrial Automation Glossary, publication AG-7.1. APD (avalanche photo diodes) Converts light to current in fiber receivers. attenuation (loss) Ratio of input optical power to output optical power for a length of fiber optic cable in dB/km. bandwidth Pulse broadening caused by multi-mode dispersion and chromatic dispersion within the cable.
Glossary local area network Family of computer networks, industrial control networks, and office networks used in short-distance, multi-user environments. loss see attenuation (loss) multi-mode Class of fibers where the light travels in multiple paths down the fiber core. numerical aperture (NA) In a lens or fiber, the sine of half the maximum angle of acceptance α. NA = sin α = √(n12 - n22) where n1= core refractive index and n2=cladding refractive index.
Glossary splice Connection in the fiber designed to increase the length of the fiber. step index Fibers with a refractive-index profile form in a rectangle. tap Couples a fraction of optical power from a fiber to a receiver. unscheduled maximum node address The highest unscheduled node address on the ControlNet network.
Glossary Notes: 82 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011
Index Numerics 1786-RPA/B module status indicators 73 wiring 68 1786-RPFM module cable specifications 70 status indicators 76 1786-RPFRL/B module cable specifications 70 description 34 relay contact connector 78 status indicators 77 1786-RPFRXL/B module cable specifications 71 description 35 relay contact connector 78 status indicators 77 1786-RPFS module cable specifications 70 connection 65 description 34 status indicators 76 A attenuation levels 35 medium distance 37, 38 records 56 B BNC cable connecto
Index I immunity to interference 12 installation aerial 48 combination 20 conduit and duct 46 direct attachment 45 direct burial 50 fiber media 19 guidelines 59 indirect attachment 46 open trench 50 parallel 20 planning 19 pulled 45 ring 20 series 20 vertical 52 intrinsically safe area 11 L longer distances fiber media 12 loss budget between repeater modules 36 measurement incorrect fiber test 56 M maximum propagation delay 39 redundant network 40 measure OTDR 57 module troubleshoot 69 mount fiber module
Index T tap description 15 terminate cable 26, 53, 67 terminating resistor description 15 test media connections and segments 26 topology 15 considerations 29 point-to-point 16 redundant 29 ring 28 star 17 troubleshoot module 69, 73 V verify network 26 V-pin connector 13 W wiring 1786-RPA/B module 68 worst case signal delay 38 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011 85
Index Notes: 86 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011
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