Rockwell Automation 1797 User Manual

ControlNet Ex Media

1797-series

Planning and Installation Manual

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.ab.com/manuals/gi) describes some 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

IMPORTANT

ATTENTION

SHOCK HAZARD

BURN HAZARD

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.

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

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

• recognize the consequence

Labels may be located on or inside the equipment (e.g., drive or motor) to alert people that dangerous voltage may be present.

Labels may be located on or inside the equipment (e.g., drive or motor) to alert people that surfaces may be dangerous temperatures.

Preface

Overview of the ControlNet Ex Media System

What’s in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Abbreviations and Symbols . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Common Techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

For More Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Chapter 1

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . 1-1

Understand the ControlNet Ex Media System . . . . . . . . . . . 1-2

Understand ControlNet Ex Components . . . . . . . . . . . . . . . 1-4

Nodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Taps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Trunk Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Cable Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Trunk Terminator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Tap Terminator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Segments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Fiber Repeater Hubs . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Insulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

ControlNet Ex System Installation Requirements . . . . . . . . . 1-9

Certified Equivalent ControlNet Ex System Components 1-10

UL, cUL I/O Entity Parameters and Requirements . . . . . 1-11

European Community Directive Compliance . . . . . . . . . 1-12

EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

Ex Directive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

What Is Next? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

Plan a ControlNet Ex Media System

Chapter 2

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . 2-1

Determine How Many Taps You Need. . . . . . . . . . . . . . . . 2-2

Connect Programming Devices in Safe Areas . . . . . . . . . . . 2-3

Coax Cable Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Fiber Media Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Determine Trunk Cable Section Lengths. . . . . . . . . . . . . . . 2-4

Determine Trunk Cable Section Length When You Use a FLEX Ex Redundant ControlNet

Barrier Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Estimate Fiber Media Lengths . . . . . . . . . . . . . . . . . . . . . . 2-7

Determine How Many Trunk Terminators You Need . . . . . 2-7

Determine What Type of Connectors You Need . . . . . . . . . 2-8

Use Redundant Media in a Hazardous Area . . . . . . . . . . . . 2-10

Application Considerations . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Understand Conductor Categories. . . . . . . . . . . . . . . . . 2-13

General Wiring Guidelines . . . . . . . . . . . . . . . . . . . . . . 2-14

Ferrite Beads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

Required Ferrite Beads. . . . . . . . . . . . . . . . . . . . . . . . . 2-15

Add Ferrite Beads . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

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Table of Contents ii

Install a ControlNet Ex Media System

Order Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

General Planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Plan a Segment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Plan Your Network . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18

Order Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18

What Is Next? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20

Chapter 3

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . 3-1

Install the Trunk Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Wire External to Enclosures . . . . . . . . . . . . . . . . . . . . . 3-1

Wire Inside Enclosures. . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Mount the Taps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Select Where to Mount the Taps. . . . . . . . . . . . . . . . . . 3-2

Mount the Taps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Install Fiber Hubs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Installation in Zone 1 . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Electrostatic Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Select a Fiber Repeater Hub Mounting Location . . . . . . 3-8

Mount the Fiber Repeater Hub . . . . . . . . . . . . . . . . . . . 3-9

Connect the Fiber Repeater Hub to a ControlNet

Ex Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11

Install Cable Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13

Collect Your Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13

Strip the Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

Test for Electrical Shorts and Continuity Between the

Center Conductor and the Shield . . . . . . . . . . . . . . . . . 3-19

Attach the Connectors to the Cable. . . . . . . . . . . . . . . . 3-20

Test for Electrical Shorts and Continuity Between the

Connector Body and Pin . . . . . . . . . . . . . . . . . . . . . . . 3-24

Connect Cable Sections . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25

Terminate Segments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25

Connect Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-27

Install the 1797-BCNR Module . . . . . . . . . . . . . . . . . . . . . . 3-28

Mounting Dimensions

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Appendix A

What This Appendix Contains . . . . . . . . . . . . . . . . . . . . . . A-1

Tap Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Universal Mounting Bracket. . . . . . . . . . . . . . . . . . . . . . . . A-2

Adjust the Cable Strip Tool

Protect Your System Against Electrostatic Discharge

Index

Table of Contents iii

Appendix B

What This Appendix Contains . . . . . . . . . . . . . . . . . . . . . . B-1

Calibrate the Cutting Blades. . . . . . . . . . . . . . . . . . . . . . . . B-1

Reverse and Replace the Cutting Blades. . . . . . . . . . . . . . . B-3

Change the Memory Blade Holder . . . . . . . . . . . . . . . . . . . B-5

Appendix C

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Table of Contents iv

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Preface

What’s in This Chapter

Use this manual to plan and install a ControlNet Ex media system. This manual describes the required components of an intrinsically-safe cable system and how to plan for and install these required components.

This manual targets the configurion of a ControlNet Ex system. However, since a ControlNet Ex system and a ControlNet system can be linked, it may be necessary to introduce and refer to concepts on the ControlNet side of the network.

Some configurations on a standard ControlNet system may not be possible within a ControlNet Ex configuration. Many of the installation methods and equipment for the ControlNet Ex system is the same as those available for the ControlNet system. However, some differences do exist. As you use this manual, note these differences.

The following tables describe where specific information is found in this manual.

For See Chapter

Help understanding the ControlNet Ex Media System 1 Help planning a ControlNet Ex Media System 2 Installation of a ControlNet Ex Media System 3

For See Appendix

Mounting dimensions (taps, universal mounting bracket, and repeater)

Adjusting the cable strip tool B Protecting your system against electrostatic discharge C

ATTENTION

You must have fundamental knowledge about

electronics and electrical codes to interpret and apply the concepts in this manual.

1 Publication CNET-IN003A-EN-P - January 2006

Preface 2

Abbreviations and Symbols

Common Techniques

The following table explains abbreviations and symbols we use in this manual.

This Means

PVC cable polyvinyl chloride cable FEP cable fluorinated ethylene propylene cable PLC processor Allen-Bradley programmable logic controller

network continues (other nodes not shown)

We use the following conventions throughout this manual:

• bulleted lists indicate information, not procedural steps

• numbered lists indicate sequential step

TIP

This symbol identifies helpful tips.

For More Information

For more information, refer to the following:

• Electronic Data Sheets:

http://www.ab.com/networks/eds/index.html

• RSNetWorx and RSLinx Software Demos and Tutorials

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Chapter

Overview of the ControlNet Ex Media System

What This Chapter Contains

Use this chapter to familiarize yourself with the ControlNet Ex media system. The following table describes what this chapter contains and where to find specific information.

For Information On See Page

Understand the ControlNet Ex Media System 1-2 Understand ControlNet Ex Components 1-4 ControlNet Ex System Installation Requirements 1-9

This system is an intrinsically-safe system specifically designed for use in hazardous areas.

TIP

For information on installation requirements for hazardous areas, refer to NFPA 70 (National Electrical Code NEC), Article 500.

This publication describes how to plan and install a ControlNet Ex media system in a hazardous area. Refer to the following publications for information on how to plan and install a coax and fiber media system in a non-hazardous environment:

• CNET-IN002, ControlNet Coax Media Planning

and Installation Manual

• CNET-IN001, ControlNet Fiber Media Planning

and Installation Manual

ATTENTION

1 Publication CNET-IN003A-EN-P - January 2006

The ControlNet Ex media system cannot be used in a safe environment after it has been exposed to signals from a hazardous area.

1-2 Overview of the ControlNet Ex Media System

Understand the ControlNet Ex Media System

Safe Area

Coax Segment

Network

Trunk Cable

Coax (1786) Fiber Hubs

The ControlNet Ex media system gives you the flexibility to design a communication network for your particular application. To take full advantage of this flexibility, spend sufficient time when you plan how to install your network before you assemble any of the hardware.

For information on installing ControlNet media in a hazardous area, refer to the ControlNet Coax Media Planning and Installation Manual, publication CNET-IN002.

Use the following figures and term definitions to understand the ControlNet Ex media system

Figure 1.1 ControlNet Coax to Fiber system for FLEX Ex

Hazardous Area

Coax Segment

Fiber Segment

Ex (1797) Fiber Hubs

Trunk Cable

Term Means

Network • A collection of connected nodes

• A collection of nodes with unique addresses in the range of 1-99

• The connection paths between any pair of devices may include repeaters and bridges.

Segment • Trunk cable sections connected via taps with terminators at each end and with no

repeaters.

Trunk Cable • The bus or central part of a media system Trunk Cable Section • A length of a cable between any two taps Fiber Repeater Hub • Consists of a fiber repeater and fiber adapter

• The components reconstruct and retransmit all traffic on one fiber or coax segment

side to another coax or fiber segment side.

Tap • The connection between any device and the ControlNet Ex or ControlNet media

system

41326

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Overview of the ControlNet Ex Media System 1-3

Te rm M ean s

Node • Any physical device connecting to the ControlNet Ex or ControlNet media system that

requires a network address to function on the network

• A network may contain a maximum of 99 nodes

• This address must be in the range of 1...99 and be unique to that network.

Trunk Terminator • A 75 Ω resistor mounted in a BNC plug

Tap Terminator • Terminates a tap drop-cable that has yet to be connected to a node with a “dummy”

node

Barrier • Barrier for coax cable provides isolation between safe and hazardous areas

Repeater • A device that connects two or more segments together

You can also use the 1797-BCNR FLEX Ex Redundant ControlNet Barrier Module to interconnect between ControlNet coax and ControlNet Ex networks. This module provides an alternative to installing ControlNet Ex fiber repeater hubs.

Network

Figure 1.2 ControlNet Coax barrier system for FLEX Ex

1797-BCNR

Safe Area

Coax Segment

TT T

Trunk Cable

Refer to Install the 1797-BCNR Module on page 3-28 for more information.

Hazardous Area

Coax Segment

Trunk Cable

41326

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1-4 Overview of the ControlNet Ex Media System

Understand ControlNet Ex Components

The ControlNet Ex media system is comprised of these components:

• Nodes

• Taps

• Trunk cable

• Cable connectors

• Terminators

• Segments

• Fiber repeater hubs (option)

• Tap terminator

• Network

• Insulators

• Coax barrier

For information about purchasi ng t hese components see the Allen-Bradley C ontrolNet Media

Component List, publication AG-PA002.

(option)

Nodes

Nodes are defined as physical devices connected to the ControlNet Ex media system that require a network address to function on the network.

40953

Tap s

Taps connect each node on a network to the coax media system via an integral 1 m (39.6 in.) drop cable.

Drop Cable

1 m (39.6 in.)

40944

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Overview of the ControlNet Ex Media System 1-5

There are four styles of taps available with:

• T or Y placement of BNC connectors

T-tap

Y-tap

40955

• Straight or right-angle connector on the drop media

40956

ATTENTION

Straight

Right-angle

Use only intrinsically-safe taps in a ControlNet Ex media system. Intrinsically-safe taps are marked “ControlNet Ex Tap.”

See page 2-2 for detailed information on taps.

Trunk Cable

The trunk cable is the bus, or central part of the ControlNet Ex

coax media system. The trunk cable may be composed of multiple sections of cable. Quad-shield RG-6 type coax cable can be used to construct trunk cable sections.

ATTENTION

You must use either of these types of ControlNet Ex trunk cable:

• 1797-RG6, Belden 3092A

• Belden 3092A blue quad-shield RG-6 type coax

cable

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1-6 Overview of the ControlNet Ex Media System

Cable Connectors

Use a cable connector (cat. no. 1786-BNC) to attach coax trunk cable sections to the tap’s BNC connector.

Trunk Cable

40957

Optional Connectors

Rockwell Automation also offers optional cable connectors for use in your network configuration. See page 2-8 for available connectors.

Trunk Terminator

A 75 Ω terminator (cat. no. 1797-XT) must be installed on the tap at

each end of a segment.

Trunk Cable

40958

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ATTENTION

Use only intrinsically-safe trunk terminators in a ControlNet Ex media system. Intrinsically-safe trunk terminators are marked “CNet Ex Trk Trm.”

Overview of the ControlNet Ex Media System 1-7

Tap Terminator

A tap terminator (cat. no. 1797-TCAP) is available to terminate unused taps.

Segment

1797-TCAP

Trunk Cable

ATTENTION

Use only intrinsically-safe tap terminators in a

40959

ControlNet Ex media system. Intrinsically-safe tap terminators are marked “CNet Tap Trm.”

Segments

A segment is a collection of coax trunk cable sections, taps, and two terminators.

Segment

Trunk Cable

40959

The total allowable length of a segment depends upon the number of taps in your segment and the coax cable type used.

See page 2-1 for detailed information.

Fiber Repeater Hubs

You can use fiber as the connector from your safe area to your hazardous area. Use fiber repeaters to connect the coax cable to the fiber. Fiber repeater hubs increase the number of taps, extend the total length of your segment, or create a star configuration (go off in multiple directions from one point). The number of fiber repeater

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1-8 Overview of the ControlNet Ex Media System

hubs and cable length total are limited depending on your network topology. You can have a maximum of 5 repeaters in series.

Safe Area

Coax Segment

TTT T

Trunk Cable

Coax (1786) Fiber Hubs

Hazardous Area

Coax Segment

Fiber Segment

Ex (1797) Fiber Hubs

41327

When you insert a fiber repeater hub into your cable system, you create a new segment. The same restrictions on the number of taps and cable length apply to this new segment.

ATTENTION

Use only the intrinsically-safe 1797 version of the fiber repeater hub in the hazardous area.

Network

A ControlNet network is the collection of connected segments, fiber repeater hubs, and nodes.

Insulators

The ControlNet Ex media system must maintain isolation from ground. Many of the connectors have metal parts. These parts must be insulated from ground contact by 500V insulation material. Insulators are provided with ControlNet Ex media system components that require insulation. For example, the ControlNet Ex taps are supplied with an insulator kit.

A large variety of BNC connectors are available for use with the ControlNet Ex media system. As a result, insulators for all types of connectors are not available. In these cases, wrapping the exposed metal with 500V insulation electrical tape is acceptable.

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Overview of the ControlNet Ex Media System 1-9

Two insulator kits are available:

• Catalog number 1797-BOOT provides standard BNC trunk cable

insulators.

• Catalog number 1797-INS provides a variety of the preformed

boots and insulators used with the ControlNet Ex system products.

ControlNet Ex System Installation Requirements

You can connect a maximum of 48 ControlNet Ex taps with a total of 250m of coax cable when using fiber hub architecture. The maximum distance increases to 1000m when you use only 2 taps.

Refer to Determine Trunk Cable Section Lengths on page 2-4 and see the table below for more information.

Catalog Number

1797-RPA ControlNet Ex

1797-RPFM ControlNet Ex

1797-ACNR15 Redundant

1797-BCNR FLEX Ex

1797-TCAP ControlNet Ex

1797-TPx ControlNet Ex

1797-XT ControlNet Ex

Catalog Name Description

Represents one ControlNet Ex Modular Repeater Adapter

Fiber Repeater Module, Medium Distance

Media ControlNet Ex Adapter

Redundant ControlNet Barrier Module

Tap (Dummy) Terminator

Coax Tap

Trunk Terminator

node and must be connected to a

coax trunk cable by

1797-TPx

Allows connection of a maximum

of two devices per 1797-RPA and

is powered directly by 1797-RPA

Represents one ControlNet Ex

node and must be connected to a

coax trunk cable by

1797-TPx -each one with two

redundant output channels that

are connected to different

ControlNet Ex networks (coax

cables and 1797-TPx)

Galvanic isolation barrier for

signal between the non-intrinsic

ControlNet system an

intrinsically-safe ControlNet Ex

system.

Represents one ControlNet Ex

node and is a simple capacitor

(56pF) with a coax connector

Four types of connections

available: S (straight T-tap), R

(right angle T-tap), YS (straight

Y-tap), and YR (right angle Y-tap) -

a maximum of 48 taps can be

connected by coax trunk cable

Simple resistor (75 Ω) with coax

connector that must be on each

end of the ControlNet Ex coax

trunk for termination

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1-10 Overview of the ControlNet Ex Media System

Catalog Number

1786-RG6 Quad-Shield,

1786-BNCP,

-BNCJ, BNCJI

1797-BOOT FLEX Ex Boot

Catalog Name Description

Maximum (functional) length

RG-6 75Ω Coax

Trunk Cable

Standard Coax Trunk Cable BNC Couplers

Insulator Kit

between two 1797-TPx is 3280ft

(1000m) - each 1797-TPx reduces

the (functional) coax cable length

by 16.3 m (53.4 ft)

Standard cable couplers

Replacement insulators

You can install fiber connecting the 1797-RPFM module with any approved associated device throughout the safe location.

All cables and fiber media that are not light blue must be marked as IS using the 1797-EXMK marking kit or other locally approved IS identification or segregation method.

ATTENTION

You must isolate all metallic parts during the installation of the ControlNet Ex system to prevent an earth connection. Use dielectric-strength isolating material. The isolating material must withstand voltages > 500V ac.

Certified Equivalent ControlNet Ex System Components

You may use these items as equivalents for system components.

Component Catalog Number Source

Coax Trunk Cable 1797-RG6 Rockwell Automation

3092IS

3092A with blue jacket Belden Wire & Cable Co.

1 Belden Wire & Cable 1189A may be used, but with functional loss of communication distance

or nodes.

Belden Wire & Cable Co.

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Overview of the ControlNet Ex Media System 1-11

UL, cUL I/O Entity Parameters and Requirements

TIP

For more information on UL and cUL installation requirements, refer to publication 1797-RM001, FLEX Ex System Certification Reference Manual.

Te rm in al s Vt (V) It (mA) Groups C

Male Bus Connector 5.8 400 A-G 3.0 3.0

(µF) La (µH)

The entity concept allows interconnection of intrinsically-safe apparatus with associated apparatus not specifically examined in combination as a system when the approved values of V

of the associated apparatus are less than or equal to V

and I

of the intrinsically-safe apparatus and the approved values of Ca

max

of the associated apparatus are greater than Ci + C

and L

respectively for the intrinsically-safe apparatus.

cable

and I

cable

or V

and

max

and L

Wiring methods must be in accordance with the National Electric Code, ANSI/NFPA 70, Article 504 and 505 or the Canadian Electric Code CSA C22.1, Part 1, Appendix F. For additional information refer to ANSI/ISA RP12.6.

WARNING

Substitution of components may impair the intrinsic

safety of this system.

AVERTISSEMENT: La substitution de composant peut compromettre la securite intrinseque.

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1-12 Overview of the ControlNet Ex Media System

If fiber optic cable is provided with a metal shield, it must be connected to a dedicated intrinsic safety ground in the intrinsically-safe location and isolated in the non-intrinsically-safe location or be connected to a ground in the hazardous location and isolated in the intrinsically-safe location.

The glass fiber must have a minimum diameter of 6µm.

European Community Directive Compliance

The ControlNet Ex System has the CE mark. It is approved for installation within the European Community or EEA regions. It has been designed and tested to meet the following directives.

EMC Directive

The ControlNet Ex System is tested to meet the Council Directive

89/336/EC Electromagnetic Compatibility (EMC) by applying the following standards, in whole or in part, documented in a technical construction file:

• EN50081-2 — EMC - Generic Emission Standard, Part 2 -

Industrial Environment

• EN50082-2 — EMC - Generic Immunity Standard, Part 2 -

Industrial Environment

The ControlNet Ex System is intended for use in an industrial environment.

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Overview of the ControlNet Ex Media System 1-13

Ex Directive

The ControlNet Ex System is tested to meet the Council Directive 94/9 EC (ATEX 100a) Equipment and Protective Systems Intended for Use in Potentially Explosive Atmospheres by applying the following standards:

• EN50014:1992, Electrical Apparatus for Potentially Explosive

Atmospheres

• EN50020:1994, Electrical Apparatus for Potentially Explosive

Atmospheres - Intrinsic Safety “i”

• EN50039:1980, Electrical Apparatus for Potentially Explosive

Atmospheres - Intrinsically-safe Electrical Systems “i”

• pr EN50284:1997, Special requirements for construction, test,

and marking of electrical apparatus of equipment group II, category 1 G

What Is Next?

Now that you have a general understanding of the ControlNet Ex media system, you are ready to go to Chapter 2 to design a ControlNet Ex media system for your specific requirements.

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1-14 Overview of the ControlNet Ex Media System

Notes:

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Plan a ControlNet Ex Media System

Chapter

What This Chapter Contains

Read this chapter to determine your network requirements.

For See Page

Determine How Many Taps You Need 2-2 Connect Programming Devices in Safe Areas 2-3 Coax Cable Type 2-3 Fiber Media Type 2-4 Determine Trunk Cable Section Lengths 2-4 Estimate Fiber Media Lengths 2-7 Determine How Many Trunk Terminators You Need 2-7 Determine What Type of Connectors You Need 2-8 Use Redundant Media in a Hazardous Area 2-10 Application Considerations 2-13 Ferrite Beads 2-15 Order Components 2-17

After reading this chapter, consult engineering drawings of your facility for specific information concerning the best location for installing your network.

TIP

1 Publication CNET-IN003A-EN-P - January 2006

The ControlNet Ex media system is a ground-isolated network. To help prevent accidental grounding:

• Properly select cable, connectors, and

accessories. Local agencies require use of these items for instrinsically safe system certification.

• Use the supplied ight-blue intrinsically-safe

insulators and dust caps to cover exposed metal parts.

• Any accessories should have a dielectric rating of

greater than 500V.

• Use good installation techniques.

• Use blue tape to help prevent metal-to-ground

connections.

2-2 Plan a ControlNet Ex Media System

Determine How Many Taps You Need

The number of taps you need depends on the number of devices you want to connect to the network. You need a tap for each node, repeater, or fiber hub on the network.

If you plan to add nodes later, you should consider ordering and installing the cable and connectors for these additional nodes when you install the initial network. This will minimize disruption to the network during operation.

TIP

A disconnected drop cable can cause noise to enter the network. Because of this, we recommend that you have only one unconnected tap per network for maintenance purposes. Use a tap terminator, catalog number 1797-TCAP, on any unconnected drop cable.

TIP

If you are planning future installation of additional nodes, and can tolerate losing communication for a short time, do not install the tap. Instead, install a BNC bullet connector, catalog number 1786-BNCJ. See page 2-8 for more information on the 1786-BNC bullet connector.

Ex Insulator Kit

With Intrinsically-safe Insulators

30394-M

Each tap kit contains the following pieces:

Tap (1797-TPS, -TPR, -TPYS, -TPYR)

Dust Cap

For noise suppression, ferrite beads are molded on the drop cable.

TIP

BNC Connector Kits

ControlNet Ex

Cable Labels

Screws

Universal Mounting Bracket

41329

We provide the light-blue intrinsically-safe insulators and dust caps to cover exposed metal parts. Use these items for instrinsically safe system certification by local agencies.

Publication CNET-IN003A-EN-P - January 2006

Plan a ControlNet Ex Media System 2-3

These tap kits are available (dust caps not shown):

Connect Programming Devices in Safe Areas

Straight T-Tap Straight Y-Tap Right-Angle T-tap

1797-TPS

1797-TPYS

Connect programming devices in safe areas to the ControlNet cable system through a 1784-KTCX15 communication card. Use a ControlNet tap to connect the communication card to the network.

Figure 2.1 Use a 1784-KTCX15 Communication Card on Coax Media

Programming Terminal

1784-KTCX15

Right-Angle Y-Tap

1797-TPR 1797-TPYR

Node

41330

Coax Cable Type

41331

You must use 1786-RG6, Belden 3092A, or Belden 3092A blue quadshield RG-6 coax cable as the ControlNet Ex trunk cable.

Publication CNET-IN003A-EN-P - January 2006

2-4 Plan a ControlNet Ex Media System

Fiber Media Type

Determine Trunk Cable Section Lengths

Trunk Terminator With Intrinsically-safe Insulator

Fiber media type specifications are listed below.

• Fiber type 62.5/125

• Connector type ST (plastic or ceramic)

• Operating wavelength 1300 nm

• Optical power budge 13.3 dB

You should install all fiber for your ControlNet Ex cable system in accordance with the regulations contained in applicable country codes, state codes, and applicable municipal codes (for example, National Electric Code). All metal connectors must be insulated from the ground. Use blue ControlNet cable or the ControlNet Ex Cable Marking Kit (1797-EXMK) to mark cable as intrinsically-safe. When you use the 1797-EXMK, be certain to place one marker at every meter of length.

A segment is comprised of several sections of trunk cable separated by taps. The total cable length of a segment is equal to the sum of all of the trunk cable sections, including taps.

Tap TapTap

IS Insulators

Trunk Cable Section

Trunk Terminator With Intrinsically-safe Insulator

30094-m

TIP

When determining the length of trunk cable sections, measure the actual cable path as it is routed in your network. Consider vertical dimensions as well as horizontal dimensions. You should always calculate the three-dimensional routing path distance when determining cable lengths.

Cover all exposed metal on connectors with either the intrinsically-safe insulators or other forms of insulation.

Select the shortest path for routing the cable to minimize the amount of cable you need. The specific details of planning such a cable route depends upon the needs of your network.

The total allowable length of a segment containing standard RG-6 quad-shield cable depends upon the number of taps in your segment. There is no minimum trunk cable section length

Publication CNET-IN003A-EN-P - January 2006

Plan a ControlNet Ex Media System 2-5

requirement. The maximum allowable total length of a segment is 1,000 m (3,280 ft) with two taps connected. Each additional tap decreases the maximum length of the segment by 16.3 m (53.4 ft). The maximum number of taps allowed on a segment is 48 with a maximum length of 250 m (820 ft).

IMPORTANT

Figure 2.2 ControlNet Single Media Derating Curve

Maximum Allowable Segment Length for FLEX Ex on ControlNet =

1000 m (3280 ft) - 16.3 m (53.4 ft) X [Number of Taps - 2]

EXAMPLE

An allowable total length of RG-6 cable segment in your application can be determined by using the equation below. Each additional tap decreases the maximum length of the segment. The maximum number of taps allowed on a segment is 48. Each additional tap decreases the maximum length of the segment.

The derating curve is applicable only when the cable meets ControlNet attenuation specifications.

)

1000 (3280)

(f m

750 (2460)

t g n e

500 (1640)

t n e

250 (820)

m g e S

32 48

Number of Taps

30014-m

If your segment requires 10 taps, the maximum segment length is:

1000m (3280 ft) - 16.3 m (53.4 ft) x [10 - 2] 1000m (3280 ft) - 130.4 m (427.7 ft)= 869.6 m

(2852.3 ft)

IMPORTANT

This equation applies when the cable does not meet ControlNet attenuation specifications.

Maximum Allowable Segment Length of Cable =

(20.29 db - Number Of Taps in Segment *.32 db)

Cable Attenuation @ 10 MHz per 304 m (1000 ft)

Note: Cable attenuation is defined as the signal loss measured at 10 MHz per 304 m (1000 ft) of cable. Cable attenuation for ControlNet Ex cables is listed in the ControlNet Ex Media Component List, publication AG-PA002.

X 304 m (1000 ft)

Publication CNET-IN003A-EN-P - January 2006

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