Rockwell Automation 1786 User Manual

Installation Instructions

ControlNet Fiber Media Planning and Installation Guide

Catalog Number

1786 Series

Important User Information

IMPORTANT

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 your local Rockwell Automation® sales office or online at http://www.rockwellautomation.com/literature/ important differences between solid-state equipment and hard-wired electromechanical devices. Because of this difference, and also because of the wide variety of uses for solid-state equipment, all persons responsible for applying this equipment must satisfy themselves that each intended application of this equipment is acceptable.

In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment.

The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for actual use based on the examples and diagrams.

No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software described in this manual.

Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc., is prohibited.

Throughout this manual, when necessary, we use notes to make you aware of safety considerations.

WARNING: Identifies information about practices or circumstances that can cause an explosion in a hazardous environment, which may lead to personal injury or death, property damage, or economic loss.

available from

) describes some

ATTENTION: Identifies information about practices or circumstances that can lead to personal injury or death, property damage, or economic loss. Attentions help you identify a hazard, avoid a hazard, and recognize the consequence

SHOCK HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that dangerous voltage may be present.

BURN HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that surfaces may reach dangerous temperatures.

Identifies information that is critical for successful application and understanding of the product.

Allen-Bradley, Rockwell Software, Rockwell Automation, RSNetWorx for ControlNet, and TechConnect are trademarks of Rockwell Automation, Inc.

Trademarks not belonging to Rockwell Automation are property of their respective companies.

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.

Topic Page

Updated the terminology for determining fiber topology 15 Added information for allowable ring configurations 18 Included installation procedures for fiber repeater modules and

a repeater adapter Updated status indicator descriptions for fiber repeater modules and

a repeater adapter

Rockwell Automation Publication CNET-IN001C-EN-P - October 2011 3

Summary of Changes

Notes:

4 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011

Preface

Get Started with the ControlNet Network Fiber Media System

Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Chapter 1

Why Choose a Fiber-optic Media System?. . . . . . . . . . . . . . . . . . . . . . . . . . 11

Analyze Your Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Identify Fiber Media Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Fiber-optic Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Nodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Repeater Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Repeater Adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Determine Network Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Point-to-Point Topology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Star Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Ring Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

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

Set up the Network SMAX Parameter in RSNetWorx Software . . 25

Terminate Your Fiber Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Test Your Fiber Media Connections and Segments . . . . . . . . . . . . . . . . . 26

Power Your Repeaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Verify Your Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Topology and Signal Considerations

Chapter 2

Develop a Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Redundant Media . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Topology Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Coax Segment Constraints. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Example Coax Segment Constraint . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Fiber Segment Constraints. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Select a Module Type Based on Distance Requirements . . . . . . . . . . . . . 31

Simplex Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Duplex Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Multi-fiber Backbone Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Estimate Cable Lengths. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

1786-RPFS Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

1786-RPFM Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

1786-RPFRL/B Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

1786-RPFRXL/B (Fiber Ring or Point-to-Point) Module . . . . . . . 35

Determine Attenuation Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Attenuation Levels for a Short-distance Fiber Segment . . . . . . . . . . 35

Attenuation Levels for Medium-distance Fiber Segments . . . . . . . . 37

Attenuation Levels for Long-distance Fiber Segments . . . . . . . . . . . 38

Attenuation Levels for an Extra-long Fiber Segment . . . . . . . . . . . . . 38

Rockwell Automation Publication CNET-IN001C-EN-P - October 2011 5

Table of Contents

Guidelines for Fiber-optic Installation

Determine Propagation Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Maximum Propagation Delay Through a Network . . . . . . . . . . . . . . 39

Maximum Propagation Delay and Skew

Through a Redundant Network. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Chapter 3

General Rules and Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Hire Fiber-optic Specialists for Installation and Certification . . . . . 43

Guidelines for Handling Fiber-optic Cable. . . . . . . . . . . . . . . . . . . . . . 44

Types of Fiber Media Installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Pulled Application Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Direct Attachment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Indirect Attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Conduit and Duct Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Aerial Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Direct Burial Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Open Trench Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Vertical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Terminate Your Fiber-optic Cable

Verify Your Network

Install Your Fiber Repeater Modules and Repeater Adapters

Chapter 4

What Is Termination? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Terminate Your Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Chapter 5

Set Network Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Measure Power Loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

OTDR Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Appendix A

Installation Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Mount the Fiber Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Install the Ferrites. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Connect a 1786-RPFS Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Connect Fiber Repeater Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Terminate the Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Wire a Repeater Adapter Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Troubleshoot the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Specifications for

Fiber-optic Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

1786-RPFS Fiber-optic Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

1786-RPFM Fiber-optic Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

1786-RPFRL/B Fiber-optic Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

1786-RPFRXL/B Fiber-optic Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

6 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011

Appendix B

Table of Contents

Status Indicators

Glossary

Index

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

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Rockwell Automation Publication CNET-IN001C-EN-P - October 2011 7

Table of Contents

Notes:

8 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011

Preface

IMPORTANT

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.

Additional Resources

Refer to the Glossary

for clarification of terms associated with fiber technologies.

To successfully apply the concepts and techniques contained in this manual, you must have a fundamental knowledge of electronics and electrical codes.

These documents contain additional information concerning related products from Rockwell Automation.

Resource Description

NetLinx Selection Guide, publication NETS-SG001. Describes the NetLinx-based networks—

ControlNet Media System Components List, publication AG-PA002

ControlLogix System User Manual, publication

ControlNet Modular Repeater Adapter Installation Instructions, publication 1786-IN013

ControlNet Modules in Logix5000 Control Systems User Manual, publication CNET-UM001

ControlNet IP67 Tap and Cable Assembly Kit Installation Instructions, publication 1786-IN017

ControlNet Coax Media Planning and Installation Guide, publication CNET-IN002

Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1

Product Certifications website, http://www.ab.com

1756-UM001

DeviceNet, ControlNet, and EtherNet/IP. Lists category numbers and specifications for

the components that comprise the ControlNet media system.

Describes how to use your ControlLogix operating system.

Provides instructions for installing a repeater adapter.

Describes how your Logix5000 controller communicates with different devices on the ControlNet network.

Provides installation instructions for a tap with an IP67 rating.

Describes the media that comprises a copper cable system.

Provides general guidelines for installing a Rockwell Automation industrial system.

Provides declarations of conformity, certificates, and other certification details.

You can view or download publications at http://www.rockwellautomation.com/

literature/. To order paper copies of technical documentation, contact your local

Allen-Bradley distributor or Rockwell Automation sales representative.

Rockwell Automation Publication CNET-IN001C-EN-P - October 2011 9

Preface

Notes:

10 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011

Chapter

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 Network 26

Why Choose a Fiber-optic Media System?

This chapter is an overview of the process you need to follow when you apply fiber media. Some of the information in this chapter repeats in subsequent chapters for instructional purposes.

Fiber media holds many advantages over traditional copper media. Since fiber-optic media transmits digitized information via light pulses over glass or plastic fibers, it avoids many of the problems common with copper applications.

In certain applications, the advantages of fiber over coax media outweigh the higher cost of fiber media and components.

ATTENTION: If you are using fiber in an intrinsically safe area, consult with your local safety coordinator.

Rockwell Automation Publication CNET-IN001C-EN-P - October 2011 11

Chapter 1 Get Started with the ControlNet Network Fiber Media System

Table 1 - Fiber Media Advantages

Features Benefits

Electrical isolation Fiber media is isolated from any potential electrical sources

Immunity to interference Fiber media is immune to EMI (electromagnetic interference)

Longer distances Fiber media has less transmission loss than copper media.

Decreased size and weight Fiber media is smaller and lighter than coax media for ease

Entry into hazardous areas Fiber media is a portal for information into hazardous areas,

that cause disruptions on copper media. Fiber media is well-suited for installations between buildings, and provides immunity to lightning strikes.

since it uses light pulses on glass fibers. Fiber media is effective in noisy environments (heavy machinery, multiple cable systems, and so forth) where copper could suffer disruptions. Fiber media is also suited for high-voltage environments.

The lower loss in fiber media means fewer repeaters than copper media, making fiber more effective for applications requiring long-distance media connections.

of installation.

reducing the risk of injury. For more information on choosing components for use in hazardous areas, refer to the ControlNet EX Media Planning and Installation Guide, publication CNET-IN003

Analyze Your Network

Identify Fiber Media Components

Take the time to analyze your current or new network application to see where it makes the most sense to use coax or fiber media. If you are creating a new network or adding fiber to an existing network, create a design plan for the fiber segments of your network and identify the purpose for the fiber segments.

By creating a plan and analyzing your design you will be eliminating the potential for misapplication of media. Use the example topologies to determine your network’s topology. When you understand your network’s topology it will help you determine the media components you need to achieve your application requirements.

The ControlNet network fiber media system is comprised of these components:

• Fiber-optic Cable

• Nodes

• Connectors

• Repeater Modules

• Repeater Adapters

For information on purchasing these components, see the ControlNet Media System Components List, publication AG-PA002

12 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011

Get Started with the ControlNet Network Fiber Media System Chapter 1

Core

Coating

Cladding

Buffer

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

Table 2 - Fiber-optic Cable Description

Parts Description

Buffer and coating The buffer and coating are the material that surround the glass fiber.

Cladding The cladding is a material that provides internal reflection so that the

Core The core is the cylinder consisting of glass fiber that carries

They are responsible for protecting the fiber strands from physical damage.

light pulses can travel the length of the fiber without escaping from the fiber.

information in the form of light pulses.

Nodes

A network is a collection of segments with nodes connected together by repeaters. A node is any physical device connecting to the ControlNet fiber or ControlNet media system that requires a network address to function on the network.

Connectors

Fiber cable connectors connect fiber cable to the fiber repeater module. The medium, long, and extra-long distance fiber repeater modules use an ST-type connector and the short-distance fiber repeater modules use a V-pin type connector. The short-distance fiber cables come factory terminated in various lengths. You can increase the distance of the network by using low loss cable and connectors.

See page 33

Rockwell Automation Publication CNET-IN001C-EN-P - October 2011 13

for more information.

Chapter 1 Get Started with the ControlNet Network Fiber Media System

IMPORTANT

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.

See the ControlNet Coax Media Planning and Installation Guide, publication

CNET-IN002

, for more information on ControlNet copper networks.

The fiber repeater modules send an optical signal through the fiber cable to the next fiber repeater module on the network. The combination of the repeater adapter (see below) and a fiber repeater module, such as the 1786-RPFM, is referred to as a fiber repeater.

Repeater Adapters

The ControlNet network uses a modular fiber repeater system. The 1786-RPA/B repeater adapter connects to both coax and fiber media, supplies power to the repeater modules, and repeats signals from the coax media to the fiber repeater modules.

The repeater adapter can supply a maximum of 1.6 A @5V DC of current to power the repeater modules.

To determine how many repeater modules you can use with a single repeater adapter, calculate the current draw of all repeater modules in your system. Do not exceed 1.6 A @ 5V DC per repeater adapter.

Table 3 - Repeater Module Current Draw

Repeater Module Backplane Current Draw

1786-RPFS 300 mA 1786-RPFM 400 mA 1786-RPFRL/B 570 mA 1786-RPFRXL/B 570 mA 1786-RPCD 400 mA

The 1786-RPFRL/B and 1786-RPFRXL/B repeater modules require 570 mA each, therefore you can attach only two of these modules to a 1786-RPA/B repeater adapter.

Regardless of repeater module current draw, you are limited to a

maximum of four repeater modules per repeater adapter.

14 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011

Get Started with the ControlNet Network Fiber Media System Chapter 1

CR N

41326

Network

Coax Segment Coax Segment

Coax Segment

TTTTTTTTT

TTTTT

NNNNNN

NN DN

FR FR

TR TR TR

TR TR

Trunk Line Drop Line

Fiber segment to isolate or extend a segment

45635

Determine Network Topology

Item Term Description Item Term Description

Passive tap with drop cable

Node or device

Terminator (dummy load)

The connection between any device and the cable system. The length of the drop cable is 1 m (3.28 ft).

Any physical device connecting to the ControlNet network cable system that requires a network address to function on the network.

Terminates a tap drop cable that has yet to be connected to a node to help prevent noise on the line.

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.

Coax repeater

Fiber repeater

Terminating resistor

An active physical layer component that reconstructs and retransmits all traffic it hears on one coax segment to another coax segment.

An active physical layer component that reconstructs and retransmits all traffic it hears on one fiber segment to another fiber segment. A coax port on the repeater adapter is available to relay the fiber traffic to the coax segment.

A 75 Ω resistor mounted in a BNC plug to absorb electrical energy of the signal at the end of the cable to prevent reflections. Each end of a segment must be terminated.

The illustration describes an example trunk line topology.

Rockwell Automation Publication CNET-IN001C-EN-P - October 2011 15

Chapter 1 Get Started with the ControlNet Network Fiber Media System

Coax Segment 1 Coax Segment 2 Coax Segment 3

Fiber Cable 1 Fiber Cable 2 Fiber Cable 3

See Important below

IMPORTANT

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.

Figure 2 - Example Point-to-Point (Trunk Line) Topology

It is not necessary to install nodes on coax segments. If you are using only the repeaters to extend the network, install a 75(catalog number 1786-XT) on the BNC coax connector on the 1786-RPA/B repeater adapter or 1786-RPCD module. This should be done to all repeater modules that are not connected to coax segments.

16 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011

Ω terminator

Get Started with the ControlNet Network Fiber Media System Chapter 1

31238-M

See Important on page 16

Star Topology

In a star topology, all segments of the fiber network start from a central location.

Figure 3 - Star Topology

Rockwell Automation Publication CNET-IN001C-EN-P - October 2011 17

Chapter 1 Get Started with the ControlNet Network Fiber Media System

Up to 20 1786-RPFR(X)L repeaters on a fiber ring.

iber

ber

Node(s)

RPA + RPFRXL

Coax

Coax Network

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.

In a ring topology on the ControlNet network, you can use:

• Up to 5 repeaters by using one 1786-RPA/A repeater adapter.

• The 1786-RPA/B repeater adapter allows for a maximum of 20

1786-RPFRL (long distance) or 1786-RPFRL/X (extra long-distance) ring repeaters.

Figure 4 - Ring Topology

If a ring is broken, the configuration then becomes a linear bus and the number of repeaters in SERIES depends on where the ring is broken. You will have as many repeaters as in the original ring.

18 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011

See page 29

to determine different topology constraints.

Get Started with the ControlNet Network Fiber Media System Chapter 1

TIP

Plan the Installation of the Fiber Media Components

Choose the Fiber Media System Composition

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

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.

• Length of the fiber segments

• Number of fiber connectors and splices in your network

• Calculate the maximum allowable segment length

• Any additional repeaters and coax segments you need

The fiber repeater consists of the following:

• A 1786-RPA repeater adapter

• Up to two 1786-RPFRL/B (long-distance) or 1786-RPFRXL/B (extra-long distance) fiber repeater modules

• Up to four 1786-RPFS (short-distance) or 1786-RPFM (medium-distance) fiber repeater modules

It is allowable to mix these repeater modules on a single repeater adapter.

Refer to Table 3 on page 14 connect to one repeater adapter. The number of repeaters and the total cable length depends on your network topology limits and the repeater modules you select.

to determine how many repeater modules you can

Rockwell Automation Publication CNET-IN001C-EN-P - October 2011 19

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

When you configure your network by using fiber repeaters, you can install them in one of the following ways:

Fiber Repeater Installation Page

Series 21 Parallel 22 Combination of series and parallel 23 Ring (only fiber) 24

ATTENTION: In hazardous areas, you must use products specifically designed for that purpose. You can use fiber repeaters that are designed for hazardous areas as a link from your non-hazardous area to your hazardous area.

For hazardous locations, consult the ControlNet EX Media Planning and Installation Manual, publication CNET-IN003

ATTENTION: The maximum distance in the network is limited by the distance between the two nodes farthest from one another, and the number of repeaters.

20 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011

Get Started with the ControlNet Network Fiber Media System Chapter 1

Node 1

Node 2 Node 3

Repeater A

Coax Segment 1

Coax Segment 2

Coax Segment 4

Coax Segment 3

Repeater B Repeater C

Node 4

Node 5

Node 6

42306

Fiber Cable 1 Fiber Cable 2

1786-RPA1786-RPA

1794-ACNR15

1786-RPFM 1786-RPFM

1786-RPCD

* See Important on page 16

1786-RPA 1786-RPFM

1794-ACNR15

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 repeaters in a series, use the RSNetWorx™ for ControlNet™ software to verify that the system is an allowable configuration. The system size is based on the maximum number of repeaters in a series and maximum length of the media used between any two nodes.

When you install repeaters in series, you can install a maximum of:

• 5 repeater modules (or 6 segments) with a 1786-RPA/A series A repeater adapter

• 20 repeater modules (or 21 segments) with a 1786-RPA/B series B repeater adapter

Figure 5 - Fiber Repeaters in a Series

. When you install fiber

Rockwell Automation Publication CNET-IN001C-EN-P - October 2011 21

In Figure 5, the maximum number of fiber repeaters is 3, because a message from coax segment 1 to coax segment 2 travels through 3 repeaters in series (A, B, and C).

For any given architecture, the highest number of repeaters that a message might travel through to get from any single node to another determines the number of repeaters in a series.

Chapter 1 Get Started with the ControlNet Network Fiber Media System

42307

Coax Segment 1 Coax Segment 2 Coax Segment 3

Node 1

Node 2 Node 3

Repeater A Repeater B Repeater C Repeater D

1786 -RPA 1786 -RPA 1786 -RPA 1786 -RPA1786-RPFM 1786-RPFM 1786-RPFM 1786-RPFM

1794-ACNR15

Fiber Cable 1

Fiber Cable 2

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 fiber repeaters being used in parallel.

Figure 6 - Fiber Repeaters in Parallel

shows an example of

Fiber repeaters A and B are in parallel off of coax segment 1. The network example shows 2 fiber repeaters in series. This is determined by counting the number of fiber repeaters a message must travel through to get from one node to another. For example, if a message travels from node 1 to node 2 (B, C) or from node 1 to node 3 (A,D), it travels through 2 fiber repeaters.

22 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011

Get Started with the ControlNet Network Fiber Media System Chapter 1

31509-M

Coax Segment 7

Repeaters D, E and F are installed in parallel

Repeater D

Coax Segment 1 Coax Segment 2 Coax Segment 3

Repeater E Repeater F

Node 1 Node 2 Node 3

Repeater A Repeater B Repeater C

Coax Segment 4 Coax Segment 6

Node 4 Node 6

Repeaters A, B, and C are installed in series and connected to the repeaters in parallel on segment 7 via Repeater F

Node 5

Coax Segment 5

Fiber Cable 1

Fiber Cable 2

Fiber Cable 3

** *

See Important on page 16

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.

• There can be only one path between any two nodes on a ControlNet network link. Multiple repeater connections between two segments are not allowed.

Figure 7 - Repeaters in a Combination of Series and Parallel

In this network example, the maximum number of repeaters that a message will travel through is 5. The path is as follows: Node 1 to Node 4 travels through repeaters D, F, C, B, A. Repeaters D and E are in parallel, so you must consider the path of Node 2 to Node 4 through repeaters E, F, C, B, A. This secondary path is dependant on the fiber and coax lengths of Segment 1 and Segment 2, including Segment 7.

Rockwell Automation Publication CNET-IN001C-EN-P - October 2011 23

Chapter 1 Get Started with the ControlNet Network Fiber Media System

Node 1

Node 2

Node 3

Node 4

31237-M

1794-ACNR15 1786-RPA 1786-RPFRXL

1786-RPA

1786-RPFRXL

1794-ACNR15

Repeater A

Repeater B

Repeater C

Repeater D

Fiber Cable 1

Fiber Cable 2

Coax Segment 1

Coax Segment 2

Coax Segment 3

Coax Segment 4

Fiber Cable 3

Fiber Cable 4

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).

In Figure 8

, the path from node 1 to node 4 in a counter-clockwise direction is through 2 fiber repeaters (A, D). In a clockwise direction, the path from node 1 to node 4 is though 4 fiber repeaters (A, B, C, D). We refer to the longer path as the worst-case delay path.

Figure 8 - Fiber Repeaters in a Ring

The 1786-RPFRXL/B and 1786-RPFRL/B fiber repeaters automatically detect which message arrives first and disregards the other at each fiber repeater location. In the above example, the 1786-RPFRXL fiber repeater for node 4

24 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011

would automatically detect the packet that arrives on a channel first, and disregard the second packet.

Get Started with the ControlNet Network Fiber Media System Chapter 1

IMPORTANT

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.

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.

Configure the Media in RSNetWorx for ControlNet Software

You can use RSNetWorx for ControlNet software to determine whether or not your system meets the network parameter requirements. Based on your system planned requirements (NUT, SMAX, UMAX, types and length of cable, number and types of repeaters and worst case network delay), RSNetWorx software will verify the network configuration parameters.

If RSNetWorx is unable to schedule the network due to errors, make the necessary changes. Changes might include inserting the correct media lengths and number of repeaters or increasing RPI, so the software can calculate the correct network parameters and download them to the keeper.

Set up the Network SMAX Parameter in RSNetWorx Software

You must properly set up the SMAX parameter in RSNetWorx for ControlNet software when used with the 1786-RPFRL or 1786-RPFRXL repeater module. The SMAX parameter sets the maximum scheduled node address on a ControlNet network. Refer to the documentation supplied with the RSNetWorx for ControlNet software.

You must set the SMAX parameter at least one node number higher than the highest-used scheduled node number. For example, on a network with 49 scheduled nodes (with 49 being the highest-used scheduled node number), you must set SMAX to at least 50. In this example, node number 50 is an unused scheduled node number.

When setting the SMAX parameter, you must allow one unused scheduled node address. This unused node address must be the highest available scheduled node number. Therefore, the maximum usable node address when using the 1786-RPFRL/B or 1786-RPFRXL/B module is 98.

For more information, see Getting Results with RSNetWorx for ControlNet, publication CNET-GR001

Rockwell Automation Publication CNET-IN001C-EN-P - October 2011 25

Chapter 1 Get Started with the ControlNet Network Fiber Media System

Terminate Your Fiber Cable

Test Your Fiber Media Connections and Segments

Power Your Repeaters

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 Tab le 8 o n pa ge 5 4 repeater modules.

You also want to use a dust cap on an unconnected terminated fiber cable end if a connector is not going to be used.

Many field testers are available to test the connectors on cable that is used with the 1786-RPFM, 1786-RPFRL/B and 1786-RPFRXL/B repeater modules. Consult with your fiber network specialist to determine which tester is the best for your media.

The power for your fiber repeaters comes from the repeater adapters. The repeater adapters must be powered by using a 24V power supply.

See page 68 power supply requirements.

for the 1786-RPA/B repeater adapter installation instructions and

for more information on available connector kits for

Verify Your Network

Verify whether your system meets the network parameter requirements.

1. In RSNetWorx for ControlNet software, go online, browse your network, and look for invalid node addresses.

2. OTDR and fiber field testers will help make sure that no segments violate distance constraints.

3. Make sure your network does not violate general network rules.

See Chapter 3, starting on page 43

4. Isolate a single segment of the network and verify its operation.

5. Connect multiple segments of the network , being mindful of bandwidth,

insertion loss of the segment, and segment length.

6. Verify that the correct connectors and cable have been installed.

See page 55

for additional information.

, for details.

26 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011

Chapter

Topology and Signal Considerations

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

Develop a Plan

Fiber-optic links in a ControlNet network system can do the following:

• Increase network length beyond that supported by coax

• Provide immunity to EMI

• Provide better electrical isolation than standard coax cable

Fiber is strongly recommended to avoid lighting problems when connecting equipment in different buildings together.

You can create point-to-point, star, and ring configurations. Up to four fiber modules, with two fiber ports each, can be directly plugged to a repeater adapter. Multiple repeater adapters can be used to increase the number of fiber or coax connections.

Each port needs two fiber connections, one for receiving and another for transmitting signals. The basic configuration connects two coax segments point-to-point by two repeater adapters and two fiber repeater modules, as illustrated in Figure 9

Rockwell Automation Publication CNET-IN001C-EN-P - October 2011 27

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