Rockwell Automation 1797 series ControlNet Ex Media Planning and Installation Manual
The 1797 series ControlNet Ex Media system provides a communication network for hazardous areas. This system allows you to connect up to 48 devices to the network with a maximum cable length of 1000m, or 250m with 48 taps. The system is designed for use with intrinsically safe devices and components.
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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
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.
IMPORTANT
Identifies information that is critical for successful application and understanding of the product.
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
• recognize the consequence
SHOCK HAZARD
Labels may be located on or inside the equipment (e.g., drive or motor) to alert people that dangerous voltage may be present.
BURN HAZARD
Labels may be located on or inside the equipment (e.g., drive or motor) to alert people that surfaces may be dangerous temperatures.
i
Preface
Overview of the ControlNet Ex
Media System
Plan a ControlNet Ex Media
System
Table of Contents
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
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
Mounting Dimensions
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
Appendix A
What This Appendix Contains . . . . . . . . . . . . . . . . . . . . . . A-1
Tap Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Universal Mounting Bracket. . . . . . . . . . . . . . . . . . . . . . . . A-2
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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
Publication CNET-IN003A-EN-P - January 2006
1
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
Help understanding the ControlNet Ex Media System
Help planning a ControlNet Ex Media System
Installation of a ControlNet Ex Media System
See Chapter
1
2
3
For
Mounting dimensions (taps, universal mounting bracket, and repeater)
Adjusting the cable strip tool
Protecting your system against electrostatic discharge
See Appendix
A
B
C
ATTENTION
You must have fundamental knowledge about electronics and electrical codes to interpret and apply the concepts in this manual.
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Preface 2
Abbreviations and Symbols
The following table explains abbreviations and symbols we use in this manual.
This
PVC cable
FEP cable
PLC processor
Means polyvinyl chloride cable fluorinated ethylene propylene cable
Allen-Bradley programmable logic controller network continues (other nodes not shown)
Common Techniques
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
Publication CNET-IN003A-EN-P - January 2006
1
Chapter
1
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
Understand the ControlNet Ex Media System
Understand ControlNet Ex Components
ControlNet Ex System Installation Requirements
See Page
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.
TIP
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
The ControlNet Ex media system cannot be used in a safe environment after it has been exposed to signals from a hazardous area.
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1-2 Overview of the ControlNet Ex Media System
Understand the ControlNet
Ex Media System
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
Network
T
N
Safe Area
Coax Segment
T T
N
T runk Cable
N
T
Coax (1786) Fiber Hubs
Fiber Segment
H H
Hazardous Area
Coax Segment
T T
Trunk Cable
T
N
N
Ex (1797) Fiber Hubs
T
N
T
N
41326
Term
Network
Segment
Trunk Cable
Trunk Cable Section
Fiber Repeater Hub
H
Tap
T
Means
•
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.
•
Trunk cable sections connected via taps with terminators at each end and with no repeaters.
•
The bus or central part of a media system
•
A length of a cable between any two taps
•
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.
•
The connection between any device and the ControlNet Ex or ControlNet media system
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Overview of the ControlNet Ex Media System 1-3
Network
Term
Node
N
Trunk Terminator
Tap Terminator
D
Barrier
B
Repeater
Means
•
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.
•
A 75
Ω
resistor mounted in a BNC plug
•
Terminates a tap drop-cable that has yet to be connected to a node with a “dummy” node
•
Barrier for coax cable provides isolation between safe and hazardous areas
•
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.
Figure 1.2 ControlNet Coax barrier system for FLEX Ex
T
N
Safe Area
Coax Segment
T
N
T
Trunk Cable
N
1797-BCNR
B T
Hazardous Area
Coax Segment
T
Trunk Cable
T
N N
T
N
T
N
Refer to Install the 1797-BCNR Module on page 3-28 for more
information.
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 1
•
Trunk cable 1
•
Cable connectors 1
•
Terminators 1
•
Segments
•
Fiber repeater hubs (option) 1
•
Tap terminator
•
Network
•
Insulators
•
Coax barrier (option) 1
1
For information about purchasing these components see the Allen-Bradley ControlNet Media
Component List, publication AG-PA002.
Nodes
Nodes are defined as physical devices connected to the ControlNet Ex media system that require a network address to function on the network.
T T T T
N N N N
40953
Taps
Taps connect each node on a network to the coax media system via an integral 1 m (39.6 in.) drop cable.
T T T T
N N
Drop Cable
1 m (39.6 in.)
N N
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
40955
Y-tap
•
Straight or right-angle connector on the drop media
Straight Right-angle 40956
ATTENTION
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.
T T
T
T
N N
Trunk Cable
N N
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.
T T T T
N N
Trunk Cable
N N
40958
ATTENTION
Use only intrinsically-safe trunk terminators in a
ControlNet Ex media system. Intrinsically-safe trunk terminators are marked “CNet Ex Trk Trm.”
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Overview of the ControlNet Ex Media System 1-7
Tap Terminator
A tap terminator (cat. no. 1797-TCAP) is available to terminate unused taps.
1797-TCAP T
N
T
Segment
Trunk Cable
T
N
T
N
40959
ATTENTION
Use only intrinsically-safe tap terminators in a
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
T T
N
T T
N
Trunk Cable
N N
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
T
N 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
T T T
N
Trunk Cable
N
Coax (1786) Fiber Hubs
Fiber Segment
H
T T
H
N
Ex (1797) Fiber Hubs
Hazardous Area
Coax Segment
T
N
T
N
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.
Publication CNET-IN003A-EN-P - January 2006
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.
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
Catalog Name Description
1797-RPFM ControlNet Ex
Fiber Repeater
Module, Medium
Distance
1797-ACNR15 Redundant
Media
ControlNet Ex
Adapter
1797-BCNR FLEX Ex
Redundant
ControlNet
Barrier Module
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.
1797-TCAP
1797-TPx
1797-XT
ControlNet Ex
Modular
Repeater Adapter
Represents one ControlNet Ex node and must be connected to a coax trunk cable by
1797-TPx
ControlNet Ex
Tap (Dummy)
Terminator
ControlNet Ex
Coax Tap
ControlNet Ex
Trunk Terminator
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
Catalog Name Description
1786-BNCP,
-BNCJ, BNCJI
1797-BOOT
Quad-Shield,
RG-6 75
Ω
Coax
Trunk Cable
Maximum (functional) length 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 Standard Coax
Trunk Cable BNC
Couplers
FLEX Ex Boot
Insulator Kit
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
Coax Trunk Cable
Catalog Number
1797-RG6
Source
Rockwell Automation
3092IS 1 Belden Wire & Cable Co.
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.
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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.
Terminals V t
(V)
Male Bus Connector 5.8
I t
(mA) Groups
400 A-G
C a
(
µ
F)
3.0
L a
(
µ
H)
3.0
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 oc
and I sc or V t and I t
of the associated apparatus are less than or equal to V max
and
I max
of the intrinsically-safe apparatus and the approved values of C a and L a
of the associated apparatus are greater than C i
+ C cable
and L i
+
L cable
respectively for the intrinsically-safe apparatus.
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 6
µ m.
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.
Publication CNET-IN003A-EN-P - January 2006
What Is Next?
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
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.
Publication CNET-IN003A-EN-P - January 2006
1-14 Overview of the ControlNet Ex Media System
Notes:
Publication CNET-IN003A-EN-P - January 2006
1
Plan a ControlNet Ex Media System
Chapter
2
What This Chapter Contains
Read this chapter to determine your network requirements.
For
Determine How Many Taps You Need
Connect Programming Devices in Safe Areas
Determine Trunk Cable Section Lengths
Determine How Many Trunk Terminators You Need
Determine What Type of Connectors You Need
Use Redundant Media in a Hazardous Area
See Page
After reading this chapter, consult engineering drawings of your facility for specific information concerning the best location for installing your network.
TIP
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.
Publication CNET-IN003A-EN-P - January 2006
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.
Each tap kit contains the following pieces:
BNC Connector Kits
Tap (1797-TPS, -TPR, -TPYS, -TPYR)
Ex Insulator Kit
With Intrinsically-safe
Insulators
30394-M
ControlNet Ex
Cable Labels
Dust Cap
Screws
Universal Mounting Bracket
TIP
For noise suppression, ferrite beads are molded on the drop cable.
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):
Straight T-Tap Straight Y-Tap Right-Angle T-tap Right-Angle Y-Tap
1797-TPS 1797-TPYS 1797-TPR 1797-TPYR
41330
Connect Programming
Devices in Safe Areas
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
Node
Coax Cable Type
41331
You must use 1786-RG6, Belden 3092A, or Belden 3092A blue quad- shield 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
Fiber media type specifications are listed below.
•
Fiber type 62.5/125
µ
•
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.
Determine Trunk Cable
Section Lengths
Trunk Terminator
With
Intrinsically-safe
Insulator
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.
IS Insulators
Tap Tap Tap
Trunk Cable Section 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
The derating curve is applicable only when the cable meets ControlNet attenuation specifications.
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]
1000 (3280)
750 (2460)
500 (1640)
250 (820)
2 16 32
Number of Taps
48
30014-m
EXAMPLE
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)
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.
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)
X 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.
Publication CNET-IN003A-EN-P - January 2006
2-6 Plan a ControlNet Ex Media System
EXAMPLE
If your segment requires 3 taps using 1786-RG6 cable, the maximum segment length is:
([20.29 db - 3*.32 db] / 5.99 db] * 304)
(19.33 db / 5.99 db) * 304 = 982 m (3227 ft)
IMPORTANT
The total trunk cable length or number of taps can be increased by installing a repeater hub on the segment. This creates another segment.
For redundant media, decrease the number of taps by half, as shown in the derating curve.
Figure 2.3 ControlNet Redundant 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]
1000 (3280)
750 (2460)
500 (1640)
250 (820)
2 8 16
Number of Taps
24
30014-m
Determine Trunk Cable Section Length When You Use a FLEX Ex
Redundant ControlNet Barrier Module
When you use a FLEX Ex Redundant ControlNet Barrier Module
(catalog no. 1797-BCNR), 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 requirement. The maximum allowable length of a segment that contains a 1797-BCNR module is 500 m. (1640 ft) with two taps connected. Each additional tap decreases the maximum length of the segment according to the derating curve. The maximum number of taps allowed on a segment is 20 with a maximum length of
250 m (820 ft).
Publication CNET-IN003A-EN-P - January 2006
Plan a ControlNet Ex Media System 2-7
500 m
(1640 ft)
250 m
(820 ft)
2 20
Number of Taps With One FLEX Ex Redundant ControlNet Barrier Module
Estimate Fiber Media
Lengths
The maximum length of a fiber media section for the 1797-RPFM module is dependent on the quality of the fiber, number of splices, and the number of connectors. The total attenuation for a cable section must be less than 13.3 dB.
Typically, cable attenuation for a wavelength of 1300 nm is less than
1.5 dB/km.
IMPORTANT
Avoid joining cable with connectors as much as possible. Connectors can cause considerable attenuation and limit the maximum length of your system. Be sure to check the attenuation of each cable sections after the cable is installed.
Determine How Many Trunk
Terminators You Need
You must use 75
Ω
trunk terminators equipped with intrinsically-safe insulators (cat. no. 1797-XT) at the end of each segment in the
ControlNet Ex cable system.
1797-XT
Intrinsically-safe Insulator
Publication CNET-IN003A-EN-P - January 2006
2-8 Plan a ControlNet Ex Media System
After you have determined the number of segments in your network, multiply this number by two to determine how many terminators you need for your network.
IMPORTANT
To comply with intrinsic safety standards, be sure to cover the exposed metal with the intrinsically-safe insulator provided with each terminator.
Determine What Type of
Connectors You Need
Use This BNC Connector cable connector
Use This Optional BNC Connector
Bullet (Jack-to-jack)
Use the following table to determine what type of connectors you need.
To
Attach trunk cable sections to a tap’s BNC connector
Cat. No.
1786-BNC
To
Reserve a space in the trunk cable for future installation of a tap or to splice a trunk cable
Cat. No.
1786-BNCJ
Barrel (Plug-to-plug)
Isolated-bulkhead
(Jack-to-jack)
Connect two adjacent taps without a trunk cable section between them
1786-BNCP
Go through grounded panel walls while maintaining the shield isolation of the trunk cable
1786-BNCJI
Tap Terminator Cap off installed taps that have yet to be connected to a node 1797-TCAP
Right Angle
(Jack-to-plug)
Provide a 90° bend in your cable (prevent bending your cable excessively)
See Chapter 3 for the bend radius specification
Refer to the ControlNet
Media System
Component List, publication AG-PA002 for the part number
Publication CNET-IN003A-EN-P - January 2006
Plan a ControlNet Ex Media System 2-9
In This Example, ControlNet Ex
Cable:
• Enters and exits the panel enclosure from the side using isolated-bulkhead connectors
• Contains two adjacent taps connected by a barrel connector
•
Reserves one future tap location with a bullet
Panel Wall
Bullet Connector
Right Angle
Connectors
Barrel
Connector
Taps
Cable Enters and Exits
From the Side
Isolated-bulkhead
Connectors
20091m
ATTENTION
Do not let any metallic surfaces on the BNC connectors, plugs, or optional accessories touch grounded metallic surfaces. This contact could cause noise on the network. All exposed metal must be covered with either intrinsically-safe blue insulators or another form of insulation, such as tape with a
500V rating.
TIP
If you install a bullet connector for future tap installations, count the bullet as one of the tap allotments on your segment (and decrease the maximum allowable cable length by 16.3 m [53.5 ft]).
This helps you avoid reconfiguring your network when you install the tap.
Publication CNET-IN003A-EN-P - January 2006
2-10 Plan a ControlNet Ex Media System
Use Redundant Media in a
Hazardous Area
You can run a second trunk cable between your ControlNet Ex nodes for redundant media. With redundant media, nodes send signals on two separate segments. The receiving node compares the quality of the two signals and accepts the better signal to permit use of the best signal. This also provides a backup cable should one cable fail.
Trunk cables on a redundant cable network are defined by the segment number and the redundant trunk cable letter.
Actual ControlNet Ex products are labeled with these icons
(the shaded icon represent redundant media).
In this figure, the redundant cable trunk cable is trunk cable B.
Safe Area
1786 Fiber
Repeater Hub
A B
Q UAL IT Y Allen-Bradley
Comm
Status
Module
Status
1797 - RPA
ControlNet E x
REPEATER ADAPTER
PWR
A
Q UAL I TY
B Allen-Bradley
1797 - RPFM
ControlNet E
FIBER MODULE x
MEDIUM RANGE
1 2 3 4
+V -V +V -V
1
Recv Xmit
Chan 1 Chan 2
Recv Xmit
Coax Trunk Cable A =
A
Q UAL IT Y
B
Allen-Bradley
Comm
Status
Module
Status
1797 Fiber
Repeater Hub
1
1797 - RPA
A B
Q UAL I TY
Allen-Bradley
ControlNet E x
REPEATER ADAPTER
PWR
2 3 4
+V -V +V -V
1
Recv Xmit
Chan 1 Chan 2
Recv Xmit
1797 - RPFM
ControlNet E x
FIBER MODULE
MEDIUM RANGE
Hazardous Area
Trunk Cable A =
Trunk Cable B =
Coax Trunk Cable B =
1786 Fiber
Repeater Hub
A B
Q UAL IT Y Allen-Bradley 1797 - RPA
A
Q UAL I TY
B
Allen-Bradley
ControlNet E x
REPEATER ADAPTER
PWR
3 4
1 2
+V -V +V -V
1
1797 - RPFM
ControlNet E
FIBER MODULE x
MEDIUM RANGE
Recv Xmit
Chan 1 Chan 2
Recv Xmit
A
Q UAL IT Y
B
Allen-Bradley
1797 Fiber
Repeater Hub
1797 - RPA
A B
Q UAL I TY Allen-Bradley
ControlNet E x
REPEATER ADAPTER
PWR
3 4
1 2
+V -V +V -V
1
Recv Xmit
Chan 1 Chan 2
Recv Xmit
1797 - RPFM
ControlNet E x
FIBER MODULE
MEDIUM RANGE
Node
41346
Observe the following guidelines when planning a redundant media system in a hazardous area.
•
Route the two trunk cables (trunk cable A and trunk cable B) differently to reduce the chance of both cables being damaged at the same time.
•
Each node on a redundant-cable network must support redundant coax connections and be connected to both trunk cables at all times. Any nodes connected to only one side of a redundant-cable network will result in media errors on the unconnected trunk cable.
Publication CNET-IN003A-EN-P - January 2006
Trunk Cable A =
Trunk Cable B =
Plan a ControlNet Ex Media System 2-11
Segment 1
Node 1
•
Install the cable system so that the trunk cables at any physical device location can be easily identified and labeled with the appropriate icon or letter. Each redundant ControlNet Ex device is labeled so you can connect it to the corresponding trunk cable.
•
Both trunk cables (trunk cable A and trunk cable B) of a redundant-cable network must have identical configurations.
Each segment must contain the same number of taps, nodes and fiber repeaters. Connect nodes and fiber repeaters in the same relative sequence on both trunk cables.
•
Either side of a redundant-cable network may differ in cable length. The total difference in length between the two trunk cables must not exceed 800 m (2640 ft).
Hazardous Area
Node 1
Node 1
A
Q UAL IT Y
B Allen-Bradley
Status Comm Status Module
1797 - RPA
ControlNet E x
REPEATER ADAPTER
PWR
A
Q UAL I TY
B Allen-Bradley
+V -V +V -V
Recv Xmit
Chan 1 Chan 2
Recv Xmit
1797 - RPFM
ControlNet E x
FIBER MODULE
MEDIUM RANGE
1797 Fiber
Repeater Hub
A B
Q UAL IT Y
Allen-Bradley
Comm
Status
Module
Status
1797 - RPA
ControlNet E x
REPEATER ADAPTER
PWR
A
Q UAL I TY
B
Allen-Bradley
+V -V +V -V
Recv Xmit
Chan 1 Chan 2
Recv Xmit
1797 - RPFM
ControlNet E x
FIBER MODULE
MEDIUM RANGE
1797 Fiber
Repeater
A
Q UAL IT Y
B
Allen-Bradley
Status Comm Status Module
1797 - RPA
ControlNet E x
REPEATER ADAPTER
PWR
A
Q UAL I TY
B
Allen-Bradley
+V -V +V -V
Recv Xmit
Chan 1 Chan 2
Recv Xmit
1797 - RPFM
ControlNet E x
FIBER MODULE
MEDIUM RANGE
A
Q UAL IT Y
B Allen-Bradley
Comm
Status
Module
Status
1797 - RPA
ControlNet E x
REPEATER ADAPTER
PWR
A B
Q UAL I TY
Allen-Bradley
+V -V +V -V
Recv Xmit
Chan 1 Chan 2
Recv Xmit
1797 - RPFM
ControlNet E x
FIBER MODULE
MEDIUM RANGE
Node 1
Node 1
Trunk Cable B =
Trunk Cable A =
1 Node Supporting Redundant Media
Segment 2
41683
Publication CNET-IN003A-EN-P - January 2006
2-12 Plan a ControlNet Ex Media System
Segment 1
Safe Area
•
Avoid connecting a single node’s redundant trunk cable connections on different segments; this will cause erratic operation.
1786 Fiber
Repeater Hubs
Q UALITY
Allen-Bradley
Status Comm Status Module
1797 - RPA Q UALI TY
Allen-Bradley
ControlNet E
REPEATER ADAPTER
PWR
+V -V +V -V
Recv Xmit
Chan 1 Chan 2
Recv Xmit
1797 - RPFM
ControlNet E
FIBER MODULE
MEDIUM RANGE
1797 Fiber
Repeater Hubs
Hazardous Area
Q UALITY Allen-Bradley
Comm
Status
Module
Status
1797 - RPA Q UALI TY Allen-Bradley
ControlNet E
REPEATER ADAPTER
PWR
+V -V +V -V
Recv Xmit
Chan 1 Chan 2
Recv Xmit
1797 - RPFM
ControlNet E
FIBER MODULE
MEDIUM RANGE
Q UALITY Allen-Bradley
Comm Module
Status Status
1797 - RPA Q UALI TY Allen-Bradley
ControlNet E
REPEATER ADAPTER
PWR
+V -V +V -V
Chan 1 Chan 2
Recv Xmit Recv Xmit
1797 - RPFM
ControlNet E
MEDIUM RANGE
Q UALITY
Allen-Bradley
Status Comm Status Module
1797 - RPA Q UALI TY
Allen-Bradley
ControlNet E
REPEATER ADAPTER
PWR
+V -V +V -V
Recv Xmit
Chan 1 Chan 2
Recv Xmit
1797 - RPFM
ControlNet E
FIBER MODULE
MEDIUM RANGE
1797 Node
1786 Node
Segment 2
41348
A node supporting redundant trunk cable connections will function even if trunk cable A is connected to the B connector on the node and vice-versa. This makes cable fault indications (on the hardware or in software) difficult to interpret and makes locating a bad cable segment very difficult.
ATTENTION
Never connect parts of a ControlNet cable system to those of a ControlNet Ex cable system. The 1786 fiber repeater hub and 1797 fiber repeater hub are used to isolate the two sections of a ControlNet network.
ATTENTION
ControlNet Ex products cannot be used in an intrinsically-safe environment after they have been exposed to non-intrinsically-safe signals.
Publication CNET-IN003A-EN-P - January 2006
Plan a ControlNet Ex Media System 2-13
Application Considerations
The following guidelines coincide with the guidelines for the installation of electrical equipment to minimize electrical noise inputs to controllers from external sources contained in IEEE standard
518-1982. When planning your cable system keep these installation considerations in mind.
ATTENTION
These guidelines apply only to noise coupling.
Intrinsic safety requirements for cable mounting are of the highest priority.
Understand Conductor Categories
Conductors can be divided into three categories.
Category Includes
1 ac power lines
High-power digital ac I/O lines
High-power digital dc I/O lines
2
3
Power connections (conductors) from motion drives to motors
Analog I/O lines and dc power lines for analog circuits
Low-power digital ac/dc I/O lines
Low-power digital I/O lines
ControlNet Ex communication cables
Low-voltage dc power lines
Communication cables to connect between system components within the same enclosure
Publication CNET-IN003A-EN-P - January 2006
2-14 Plan a ControlNet Ex Media System
General Wiring Guidelines
Follow these guidelines with regard to noise coupling. Following intrinsic safety requirements should prevent most or all of these situations from occurring. These guidelines are provided as a general reference for wiring.
•
If wiring must cross power feed lines, it should do so at right angles.
•
Route wiring at least 1.5 m (5 ft) from high-voltage enclosures, or sources of rf/microwave radiation.
•
If the conductor is in a metal wireway or conduit, each section of that wireway or conduit must be bonded to each adjacent section so that it has electrical continuity along its entire length, and must be bonded to the enclosure at the entry point.
For more information on general wiring guidelines, see the
Industrial Automation Wiring and Grounding Guidelines, publication
1770-4.1.
No
Wire External to Enclosures
Cables that run outside protective enclosures are relatively long.
To minimize cross-talk from nearby cables, you should maintain maximum separation between the ControlNet Ex cable and other potential noise conductors. Route your cable following these guidelines:
Cable in a Contiguous
Metallic Wireway or
Conduit?
Yes
Route Your
Cable At Least
From Noise Sources of This Strength
0.08 m (3 in.)
0.15 m (6 in.)
0.3 m (12 in.)
0.15 m (6 in.)
0.3 m (12 in.)
0.6 m (24 in.)
Category-1 conductors of less than 20A ac power lines of 20A or more, up to 100 KVA ac power lines greater than 100 KVA
Category-1 conductors of less than 20A ac power lines of 20A or more, up to 100 KVA ac power lines greater than 100 KVA
Wire Inside Enclosures
Cable sections that run inside protective equipment enclosures are relatively short. As with wiring external to enclosures, you should maintain maximum separation between your ControlNet Ex cable and
Category-1 conductors.
Publication CNET-IN003A-EN-P - January 2006
Ferrite Beads
Plan a ControlNet Ex Media System 2-15
When you run cable inside an enclosure, route conductors external to all raceways in the same enclosure, or in a raceway separate from
Category-1 conductors.
Route Your Cable At Least From Noise Sources of This Strength
0.08 m (3 in.) Category 1 conductors of less than 20 A
0.15 m (6 in.)
0.6 m (24 in.) ac power lines of 20A or more, up to 100 KVA ac power lines greater than 100 KVA
Surge Suppression
Transient electromagnetic interference (emi) can be generated whenever inductive loads such as relays, solenoids, motor starters, or motors are operated by hard contacts such as push-button or selector switches. These wiring guidelines assume you guard your system against the effects of transient emi by using surge-suppressors to suppress transient emi at its source.
Inductive loads switched by solid-state output devices alone do not require surge suppression. However, inductive loads of ac output modules that are in series or parallel with hard contacts require surge-suppression to protect the module output circuits as well as to suppress transient emi.
Ferrite beads provide additional suppression of transient emi.
Fair-Rite Products Corporation manufactures a ferrite bead
(part number 2643626502) that can be slipped over Category-2 and
Category-3 (RG-6 type trunk cable) conductors. You can secure them with heat-shrink tubing or tie-wraps. A cable transient emi induced onto the cable can be suppressed by a ferrite bead located near the end of the cable. The ferrite bead will suppress the emi before it enters the equipment connected to the end of the cable.
Required Ferrite Beads
Five ferrites come with each ControlNet Ex adapter. Four are identical and are for use on the ControlNet Ex trunk cable (two for Segment 1 and two for Segment 2). The fifth ferrite is longer. You use this ferrite on the adapter power cable.
Publication CNET-IN003A-EN-P - January 2006
2-16 Plan a ControlNet Ex Media System
Add Ferrite Beads
Wrap the IS power input cable two turns around the ferrite bead before connecting the terminal block to the adapter.
Five ferrite beads come with the adapter. Four are short and identical. Use these on the
ControlNet Ex trunk cable. The fifth, longer ferrite bead is for the adapter power cable.
Add ferrite beads on the
ControlNet Ex trunk cable inside the cabinet wherever the trunk cable goes into or out of the cabinet.
Ferrite Beads
42206
30890-M
Publication CNET-IN003A-EN-P - January 2006
Order Components
Plan a ControlNet Ex Media System 2-17
Now that you are ready to begin ordering components, use these guidelines to help you select components.
General Planning
The ControlNet Ex cable system is isolated from earth and must be protected from inadvertent ground connections.
Plan a Segment
Refer to this list when you plan a segment.
•
All connections to the trunk cable require a tap
•
Taps may be installed at any location on the trunk cable
•
Tap drop-cable length must not be changed
•
Maximum number of taps = 48, with 250 m (820 ft) of standard
RG-6 trunk cable
•
Maximum trunk cable length of RG-6 trunk cable = 1000 m
(3280 ft), with 2 taps
•
75
Ω
trunk terminators are required on both ends
•
One tap with an unconnected drop cable may be installed for maintenance purposes
•
Use BNC bullet connectors at future tap locations
•
Do not mix redundant and non-redundant nodes
•
Use ControlNet Ex tap terminators (1797-TCAP) for all other unconnected drop cables
•
Avoid high noise environments when routing cables
•
A supplied ferrite toroid should be used on the ControlNet Ex trunk as it enters and leaves control cabinets
Publication CNET-IN003A-EN-P - January 2006
2-18 Plan a ControlNet Ex Media System
Plan Your Network
Refer to this list when you plan your network.
•
Maximum of 99 nodes (excluding fiber repeater hubs)
•
Fiber repeater hubs require a tap but are not counted as nodes
(they are included in the number of devices allowed per segment [48])
•
Fiber repeater hubs may be installed at any tap location along a segment
•
There can be only one path between any two points on a network
•
The configuration of both sides of a redundant segment must be the same
•
The total cable difference between the two sides of a redundant network cannot exceed 800 m (2640 ft)
Item
Taps
Straight T-tap
Straight Y-tap
Right-angle T-tap
Right-angle Y-tap
Trunk Terminators
Trunk Cable
Tap Terminator
Order Parts
The following table contains a list of ControlNet Ex Components.
Refer to the ControlNet and ControlNet Ex Media System Components
List, publication AG-PA002, for a list of other ControlNet parts.
Cat. No.
1797-TPS
1797-TPYS
1797-TPR
1797-TPYR
1797-XT
(quantity of 50)
1797-TCAP
(quantity of 5)
Guidelines
Required Quantity
1
You need a tap for each connection to the trunk cable (nodes and repeaters).
Number of repeaters x 2
+
Number of nodes
Each tap kit contains: two BNC connector kits, one dust cap, one universal mounting bracket, ControlNet Ex cable labels and two screws
You need a terminator for each end of each segment.
Use the ControlNet Ex Media System
Component List, publication AG-PA002, to order your required length of cable.
Number of segments x 2
of this document to determine cable length
Use the dummy load to plug into drop cables that are not attached to a node.
One for every drop cable that is not attached to a node
Publication CNET-IN003A-EN-P - January 2006
Plan a ControlNet Ex Media System 2-19
Item
Coax Tool Kit
Cat. No.
1786-CTK
Guidelines
Required Quantity
1
Use the tool kit to create your trunk cable to your specifications.
One
1
You will need to double your quantities when ordering components for a redundant cable system.
2
The connector kit may be shipped with two ferrules. The smaller diameter ferrule should not be used with ControlNet Ex applications.
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2-20 Plan a ControlNet Ex Media System
What Is Next?
After you gather all of the parts for your ControlNet Ex media system, you are ready to go to Chapter 3 to begin the installation of your network.
Publication CNET-IN003A-EN-P - January 2006
1
Install a ControlNet Ex Media System
Chapter
3
What This Chapter Contains
Follow the instructions in this chapter to install your ControlNet Ex media system.
For
See Page
TIP
You should read Chapter 2, Plan a ControlNet Ex
Network, before you install your network.
Install the Trunk Cable
When installing your trunk cable, observe your cable supplier’s installation instructions and these guidelines.
Wire External to Enclosures
When the RG-6 type coax cable is being pulled through multiple conduit bends, follow these specifications.
For This Coax
Cable
PVC
The Pull Strength Should Not
Exceed
42.75 kg (95 lbs)
The Bend Radius Should Not
Exceed
76.2 mm (3.0 in.)
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3-2 Install a ControlNet Ex Media System
Mount the Taps
Wire Inside Enclosures
When the RG-6 type coax cable is not being pulled through conduit, follow these specifications.
For This Coax Cable The Bend Radius Should Not Exceed
PVC 38.1 mm (1.5 in.)
Tap drop-cable 25.4 mm (1.0 in.)
The 1797-EXMK Cable Marking kit is available for clearly marking drop cables and trunk cables as intrinsically-safe.
First select where you want to mount the taps, then use this mounting procedure.
Select Where to Mount the Taps
There is no spacing requirement between taps; you can install two adjacent taps if necessary by using a barrel connector (1786-BNCP).
IMPORTANT
If the barrel connector (1786-BNCP) is used, use an intrinsically-safe insulator, the light-blue dust caps we provide, or tape having a 500V insulation rating to cover exposed metal parts. Local agencies require their use for intrinsically-safe certification.
Be certain that:
• you choose a convenient location to mount and route the cable.
• the location does not cause any cable bend-radii to exceed the
limits listed on pages 3-1 and 3-2.
• you route the cable in accordance with intrinsically-safe cable routing specifications.
• you do not mount the tap in a position that routes the drop cable over any ac power terminals on nearby modules.
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Install a ControlNet Ex Media System 3-3
ATTENTION
Do not allow any metal portions of the tap, such as the universal mounting bracket screws or connectors, to contact any conductive material. This contact could cause noise on the network.
Also be certain all exposed metal is covered by either the intrinsically-safe insulators or tape having a
500V dielectric rating.
Mount the Taps
You can mount your ControlNet Ex taps (Y-tap and T-tap):
• to a universal mounting bracket, and then mount the tap and bracket as an assembly.
• through the body holes in the tap using screws, flat washers, and a tie wrap.
Once you have mounted your taps, you can store or discard any unused universal mounting brackets.
TIP
See Appendix A for universal mounting bracket and tap mounting dimensions.
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3-4 Install a ControlNet Ex Media System
Mount a Tap with a Universal Mounting Bracket
1. Align the universal mounting bracket with the mounting holes on the tap.
2. Use the screws provided with the tap to attach the tap to the universal mounting bracket.
Universal Mounting Bracket
Y-Tap
Dust Cap T-Tap
Universal Mounting Bracket
(Provided With Tap)
Dust Cap
20084-M
Use only the screws that are packaged with the tap. They are the proper length and head style.
20080-M
ATTENTION
Do not over-tighten the screws. Over-tightening the screws can damage the tap. The applied torque should be 0.2-0.4 Nm (1-2 ft-lbs).
ATTENTION
Do not remove the intrinsically-safe dust cap unless the tap drop is connected to a ControlNet Ex product.
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Install a ControlNet Ex Media System 3-5
Universal Mounting Bracket
3. Mount the tap and bracket assembly to a DIN rail or another mounting surface.
DIN Mounting Rail Another Mounting Surface
Universal Mounting Bracket
Use four screws to attach the universal mounting bracket to another mounting surface.
DIN Rail
Suitable Fixture
20081-M
20082-M
Mount the universal mounting bracket on specified Allen-Bradley mounting rails or #3 style symmetrical DIN rails (35 mm X 7.5 mm [1.38 in. x 0.30 in.])
Type of Rail Cat. No.
A-B rail 1492-N1
1492-N22
1492-N44
Type of Rail
DIN rail #3
Cat. No.
199-DR1
1492-DR5
1492-DR6
1492-DR7
ATTENTION
Use an intrinsically-safe insulator, the light-blue dust caps we provide, or tape having a 500V insulation rating to cover exposed metal parts. Local agencies require their use for intrinsically-safe certification.
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3-6 Install a ControlNet Ex Media System
Tie Wrap
Mount a Tap Through the Body Holes
TIP
A suitable fixture (mounting surface) can be conductive or grounded because the mounting holes are electrically isolated.
Mount the tap to a suitable fixture by using a tie wrap, or screws and flat washers.
Body Holes
Tie Wrap
Screws and Flat Washers
Screws and Flat Washers
(Not Supplied)
Body Holes
41645 You can use a variety of screw types.
41646
ATTENTION
Do not over-tighten the screws. Over-tightening the screws can damage the tap. The applied torque should be 0.2-0.4 Nm (1-2 ft-lbs). Do not use screws larger than #8 in these holes.
Specifications
Install Fiber Hubs
The following table lists the specifications for the ControlNet Ex taps.
Operating temperature -20 to 70 °C (-4 to 158 °F)
Storage temperature -40 to 85 °C (-40 to 185 °F)
Relative humidity 5 to 95% noncondensing
Read the following sections before installing a fiber repeater hub.
To Install a Fiber Repeater Hub, You Should
Apply the Installation in Zone 1 and related intrinsically-safe warnings and standards
Select where to mount the fiber repeater hub
Mount the fiber repeater hub
See Page
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Install a ControlNet Ex Media System 3-7
Installation in Zone 1
The 1797-RPA and 1797-RPFM modules must not be exposed to the environment. You must install these modules in a metal enclosure.
This repeater hub has a protection factor of IP20.
ATTENTION
These modules cannot be used in a hazardous environment after they have been exposed to non-intrinsically-safe signals.
Attention: Avoid electrostatic charge.
Electrostatic Charge
Protect the system against electrostatic charge. Post a sign near this module. The sign should read
Attention! Avoid electrostatic charge.
For your convenience, see page C-1 for signs that you can cut out.
European Community Directive Compliance
If this product 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
This product 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
This product is intended for use in an industrial environment.
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3-8 Install a ControlNet Ex Media System
Ex Directive
This product 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
Inputs/Outputs
Do not apply any non-intrinsically-safe signals to the fiber modules.
When you use an intrinsically-safe electrical apparatus according to
EN50020, the European directives and regulations must be followed.
Select a Fiber Repeater Hub Mounting Location
The fiber repeater hub should be mounted:
• so that air can flow in and out of the air holes on the top and bottom of the coax repeater.
For proper ventilation, be certain that there is a minimum of 5.1 cm (2 in.) from surrounding equipment.
• in a NEMA enclosure to provide protection from dust, moisture, or corrosive atmospheres to a grounded metal plate, if possible.
ATTENTION
Be certain that the adapter and fiber modules are secured together with DIN-rail anchors. Failure to do so may result in the loss of communications or cause damage to the modules.
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Install a ControlNet Ex Media System 3-9
Mount the Fiber Repeater Hub
Follow this procedure to mount the fiber repeater hub.
1. Position the module on a 35 mm x 7.5 mm (1.38 in. x 0.30 in.)
DIN rail (A-B part number 199-DR1) at approximately a 30° angle.
41167
2. Hook the lip on the rear of the adapter onto the top of the DIN rail, and rotate the module onto the rail.
41166
3. Press the adapter down onto the DIN rail until flush.
The locking tab should snap into position and lock the module to the DIN rail.
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3-10 Install a ControlNet Ex Media System
4. If the adapter does not snap into position, use a screwdriver or similar device to move the locking tab down while pressing the module flush onto the DIN rail. Release the locking tab to lock the module in place. If necessary, push up on the locking tab to lock.
41168
5. Remove the adapter backplane connector cover.
6. Follow steps 1 through 4 to attach fiber modules to the DIN rail.
7. Once attached to the DIN rail, slide fiber modules to the left to mate with the adapter.
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41169
IMPORTANT
A DIN-rail end anchor (A-B part number 1492-EA35) must be used on the left side of the adapter and to the right side of the fiber module to keep the units from moving.
8. Be certain the last fiber module has its backplane connector cover in place.
9. Connect the adapter wiring as shown on page 3-11.
IMPORTANT
You can attach only two media modules to the repeater adapter. If you exceed the module limit, you may cause damage to the adapter or fiber modules and void the intrinsically-safe certification.
Install a ControlNet Ex Media System 3-11
Connect the Fiber Repeater Hub to a ControlNet Ex Network
1. Connect to the ControlNet Ex coax network with the drop line of the Ex coax tap to the adapter BNC connector.
Intrinsically-safe
Insulator
41170
2. Connect the fiber media to the fiber module by attaching the receive and transmit fibers to either the left or right set of receive and transmit ports.
IMPORTANT
Make note of which fiber is receive and which is transmit. These fibers must be interchanged at the opposite end of the cable.
.
3. Attach the opposite ends of the cable to the other fiber module.
A B
Q UAL IT Y
Allen-Bradley
Comm
Status
Module
Status
1797 - RPA
A B
Q UAL I TY
Allen-Bradley
REPEATER ADAPTER
PWR
1 2
3 4
+V -V +V -V
1
Receive
Transmit
Recv Xmit
Chan 1 Chan 2
Recv Xmit
1797 - RPFM
ControlNet E
FIBER MODULE
MEDIUM RANGE
ATTENTION
A B
Q UAL IT Y
Allen-Bradley
Comm
Status
Module
Status
1797 - RPA
A B
Q UAL I TY
Allen-Bradley
ControlNet E x
REPEATER ADAPTER
PWR
1797 - RPFM
ControlNet E
FIBER MODULE
MEDIUM RANGE
1 2
3 4
+V -V +V -V
1
Recv Xmit
Chan 1 Chan 2
Recv Xmit
Transmit
Receive
4131
Use the blue intrinsically-safe insulators on all coax
BNC drop connectors as they are installed.
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3-12 Install a ControlNet Ex Media System
4. Apply +V and -V power from a 1797 power supply to the adapter through a removable terminal block.
+V -V +V -V
+V -V +V -V
41297
Screw terminals and spring terminals are provided.
5. Strip the +V and -V wires to a length so that no bare conductor shows after inserting the wires into position.
.
6. If you are using the spring terminals of the plug, insert a screwdriver into the slot and carefully pry until the spring clamp opens to accept the wire.
ATTENTION
Do not use any unused terminals on this adapter.
Using these terminals as supporting terminals can result in damage to the module or unintended operation of your system.
Make certain that you power this adapter with an intrinsically-safe power supply. Do not exceed the values listed in the specifications for this adapter.
Do not remove or replace a module when power is applied. Interruption of the bus can result in unintended operation or machine motion.
IMPORTANT
Be certain that all fiber modules are attached and secured before you apply intrinsically-safe power to the adapter. Failure to do so may cause damage to the adapter and modules.
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Install a ControlNet Ex Media System 3-13
Install Cable Connectors
After you have mounted the taps, you need to attach cable connectors to the ends of your trunk cable sections.
Collect Your Tools
To install the cable connectors, we recommend that you use the tools in the ControlNet Coax Toolkit, catalog number 1786-CTK.
Wire Cutters
ControlNet Media Component List,
Publication AG-PA002
ControlNet Coax Media Planning and Installation
Guide, Publication CNET-IN002
Cable Strip Tool With Two Blade Cassettes
(One for PVC and One For FEP)
Terminators and Extra Connectors
Crimp Tool
Knife
Calibration/Flare Tool
Memory Blade Holder
Memory Blade Cartridges (Contains Two Sets of
Memory Blades)
41902
ATTENTION
Be certain that you calibrate the cable strip tool the first time you use the tool and every time you change the blade for both memory cartridges. Refer to
Appendix B for the proper calibration procedure.
Due to slight differences between coax cables, you should calibrate the tool when changing:
• part numbers
• from one cable manufacturer to another
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3-14 Install a ControlNet Ex Media System
Strip the Cable
When you cut cable sections, make them long enough to route from one tap to the next with sufficient length so that the bend radius is not less than:
•
76.2 mm (3 in.) for wiring external to enclosures
•
38.1 mm (1.5 in.) for wiring inside enclosures
ATTENTION
Be certain to perform the calibration procedure the first time you use the tool and every time you change the blade or both memory cartridges. Refer to
Appendix B for the proper calibration procedure.
1. Verify that you have the proper memory blade holder installed for the type of cable you are using (PVC-CL2 or FEP-CL2P). If you need to change the memory blade holder, see Appendix B.
Blade Holder
20165
2. Straighten out the end of the cable.
3. Insert the cable into the cable strip tool’s cutting chamber so that extra cable, approximately 25.4 mm (1 in.), extends beyond the edge of the tool.
25.4 mm (1 in.)
Extra Cable
Cable
20073
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Install a ControlNet Ex Media System 3-15
4. Lock the cable into place by moving the chamber-gauge ring forward until it meets the cable with slight resistance.
20073
This gauge moves two rollers toward the cable and regulates the depth of the cut.
The gauge will click as it moves from one gauge to the next.
5. Hold the cable in one hand, place the index finger of your other hand inside the chamber-gauge ring and turn the strip tool 360° around the cable. Turn four or five full rotations until the strip tool glides easily around the cable.
20074
Repeat steps 4 and 5, moving the chamber-gauge ring forward one notch for each time you repeat the steps, until you reach the last notch.
Each Time you move the chamber-gauge ring forward a notch, the strip tool makes a deeper cut into the cable.
IMPORTANT
The last time you repeat steps 4 and 5, apply sufficient pressure on the chamber-gauge ring to be certain the ring has reached the last stage. The chamber gauge reads ‘stop’ for the last repetition.
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3-16 Install a ControlNet Ex Media System
6. After you have moved the chamber gauge ring to the last position and turned the strip tool the final time: a. Move the chamber-gauge ring backward to release the strip tool and remove it from the cable.
b. Slip the crimp ferrule onto the cable. Push it back to the sheath area of the cable to keep it out of the way for the moment.
Crimp Ferrule
41887a
Cable c. Strip away the appropriate portion of the cable without using the strip tool.
d. Clean the cable parts that remain from the strip chamber after each use.
Be sure to strip the cable to expose these layers of the cable:
All Four Shield Layers
White Foam Electric
Braid/Tape/Braid/Tape
Or 1st Tape, If Tape
Is Bonded
Center
Conductor
8.3 mm (0.33 in.)
3.7 mm (0.15 in.)
4.0 mm (0.16 in.)
20076a
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Install a ControlNet Ex Media System 3-17
Be sure to strip the cable to expose these layers of the cable:
All Four Shield Layers
Braid/Tape/Braid/Tape
White Foam Electric
Or 1st Tape, If Tape
Is Bonded
Center
Conductor
8.3 mm (0.33 in.)
3.7 mm (0.15 in.)
4.0 mm (0.16 in.)
20076a
IMPORTANT
If you do not see the three distinct layers of cable or if the outer braid has been scored or cut, snip off the exposed end with the wire cutters and repeat the entire cable-stripping process. It is very important that the outer braid be intact before you crimp the connector.
If You Are
Using
FEP cable
PVC cable
Go To Step
7
8
7. If you are using plenum FEP cable, cut off an additional 3.1mm
(approximately 1/8 in.) of the outer sheath with the knife from the toolkit.
All Four Shield Layers
Braid/Tape/Braid/Tape
White Insulation Or
1st Tape
Center
Conductor
Sheath
11.44 mm (0.45 in.)
3.7 mm (0.15 in.)
4.0 mm (0.16 in.)
20076a
8. Be certain that the center conductor meausures 4.0 mm (0.16 in.) in length.
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3-18 Install a ControlNet Ex Media System
Use the imprint guide on the back of the ControlNet tap or the calibration tool to verify this.
T-Tap
3.7 mm
(0.15 in.)
4.0 mm
(0.16 in.)
8.3 mm
(0.33 in.)
PVC Cable
Center Conductor
PVC Cable Only
The center conductor should be exactly 4.0 mm (0.16 in.). If the center conductor is too long, cut off the excess with the wire cutter from the cable kit. If it is too short, repeat the entire cable stripping process.
PVC/CL2
Calibration/flare Tool
PVC/CL2
FEP/CL2P
FEP/CL2P
Use this end of the calibration tool to verify proper measurements for FEP cable.
41952
ATTENTION
Check for any braid stranding that may not have been cut at the proper length. If one strand comes in contact with the center conductor, it could short out the cable. If you find any such strands, cut them to the correct length.
ATTENTION
Check the outer braid of cable for cut or scored braid wire after you strip the cable. If the braid is damaged, cut off the end and strip the cable again.
You may need to adjust the appropriate striper blade by backing the set screw out 1/8 of a turn. Do not crimp the BNC to a damaged braid. This type of mistake accounts for most of the connectivity problems that can occur. Precise, clean connections will reduce network errors.
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Install a ControlNet Ex Media System 3-19
Test for Electrical Shorts and Continuity Between the Center
Conductor and the Shield
1. The NetLinx Media Checker (catalog number 1788-MCHKR) is the preferred tool for continuity testing. Attach the connector end of the cable to the port on top of the media checker.
Attach the connector end of the cable to the port on top of the media checker.
MediaChecker
1788-MCHKR
ENTER SETUP
OFF
TEST
LENGTH
WIRE MAP
31195-M
2. As a secondary method, you can also use an ohmmeter or continuity tester to test for a short between the connector body and pin.
3. Use shorting clips to connect a temporary short between the pin and connector body at one end of the cable.
Connector Body
20166
Pin
4. At the other end of the cable, use the media checker, an ohmmeter, or continuity tester to test for electrical continuity.
If Resistance Reading Indicates Then
That a short exists Continue to next section
There is no short Use your wire cutters to cut off the connector, install a new connector and begin testing again
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3-20 Install a ControlNet Ex Media System
IMPORTANT
Replace the trunk cable section if problems persist with the cable after completing these tests.
Attach the Connectors to the Cable
1. Push the calibration/flare tool onto the cable and with a slight twisting motion (with sufficient inward pressure) to expand the braid.
41888
Push the calibration/flare tool gently and rotate slightly onto the connector while you apply pressure. This will work the base of the connector underneath the wire braid slowly.
41890
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Install a ControlNet Ex Media System 3-21
2. Place the center pin over the center conductor.
41889
Sometimes strands of insulation are left on the center conductor. Be certain that the center conductor is clean before you install the center pin.
IMPORTANT
Be certain that the center pin slips onto the center conductor completely. The back shoulder of the center pin should be up against the white insulation.
If it is not, recheck the length of the center conductor.
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3-22 Install a ControlNet Ex Media System
3. With the center pin in place, use the crimp tool to crimp the pin into place.
The smaller hexagonal crimping notch is for crimping the center pin onto the center connector.
41903
Check for braid strands that could cause a short to center conductor.
4. Slide the ControlNet connector onto the cable.
Braid and Tape Shields
Connector Base
41896
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Install a ControlNet Ex Media System 3-23
5. Slide the crimp ferrule over the three outer shields and connector base until it meets the shoulder on the connector.
20077e
6. Use the crimp tool to crimp the ferrule. Position the crimp tool on the ferrule as close as possible to where the connector base and ferrule meet. Press the tool tightly around the ferrule until the crimp tool releases.
The larger hexagonal crimping notch is for crimping the ferrule which holds the connector to the cable.
Crimp Ferrule
IMPORTANT
Many network problems are due to improperly installed connectors. Your connectors should fit tight on the ends of all your cables. Pull the connector to verify that it is attached. If it is loose or comes off, snip off the connector and install a new one. The connector should withstand a minimum 75lbs pull force if properly installed.
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3-24 Install a ControlNet Ex Media System
Test for Electrical Shorts and Continuity Between the Connector
Body and Pin
1. Use an ohmmeter or continuity tester to test for a short between the connector body and pin.
Attach the connector end of the cable to the port on top of the media checker.
MediaChecker
1788-MCHKR
ENTER SETUP
OFF
TEST
LENGTH
WIRE MAP
31195-M
If Resistance Reading Indicates Then
That a short exists Continue to next section.
There is no short Use your wire cutters to cut off the connector, install a new connector, and begin testing again.
2. Connect a temporary short between the pin and connector body at the opposite end of the cable.
Connector Body
Pin
41686
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Install a ControlNet Ex Media System 3-25
3. At the same end of the cable tested in step 1, use an ohmmeter or continuity tester to test for electrical continuity.
Attach the connector end of the cable to the port on top of the media checker.
MediaChecker
1788-MCHKR
SETUP ENTER
OFF
TEST
LENGTH
WIRE MAP
31195-M
If Resistance Reading Indicates Then
That a short exists
There is no short
Continue to next section.
Use your wire cutters to cut off the connector, install a new connector, and begin testing again.
Connect Cable Sections
Connect the cable sections to the tap’s BNC connectors and cover all exposed metal with intrinsically-safe insulators.
Terminate Segments
The taps on the ends of the segment have only one cable connector attached to them. This leaves an open, or unterminated, end on the segment. Signals transmitted along the cable will reflect off these unterminated ends and interfere with transmission.
To eliminate signal reflections from the ends of the segment, you must attach a 75
Ω
trunk terminator (catalog number 1797-XT) to the first and last taps on the segment. The terms first and last refer to the physical location of the node along the trunk cable.
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3-26 Install a ControlNet Ex Media System
1. Connect one end of the trunk cable section to one of the tap
BNC connectors.
20078
2. Slide the intrinsically-safe blue insulator over the BNC connector to cover any exposed metal.
3. Install a 75
Ω
terminator onto the tap’s other BNC connector.
Repeat steps 1 and 2 at the other end of the segment.
1797-XT with intrinsically-safe insulator 20079
ATTENTION
Be certain that the intrinsically-safe insulator covers all metal parts.
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Connect Devices
Install a ControlNet Ex Media System 3-27
After you terminate your segments, connect your devices.
To Connect a
Fiber repeater hub
ControlNet Ex adapter
See
Procedure below
1. Remove and save the blue dust cap (on the straight or right-angle connector).
2. Replace the dust cap with the blue intrinsically-safe insulator ring.
3. Connect the straight or right-angle connector to your device.
If Your Node Supports Connect the Straight or Right-angle Connector non-redundant media To the channel A connector on the device (channel B is not used)
1 redundant media From trunk cable A to channel A on your device
From trunk cable B to channel B on your device
1
While both channels are active, we recommend using channel A for non-redundant media.
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3-28 Install a ControlNet Ex Media System
Install the 1797-BCNR
Module
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 coax and Ex fiber repeater modules.
Use the 1797-BCNR FLEX Ex ControlNet barrier module in Class I,
Divison 2 or Zone 2 safe areas, as shown in the figure.
Figure 3.1 ControlNet Coax to Ex System With 1797-BCNR FLEX Ex ControlNet
Barrier Module
ControlNet A
ControlNet Ex TAP
(1797-TPR)
ControlNet B
ControlNet Ex Tap
(1797-TPR)
ControlNet Barrier
Safe Area Hazardous Area
ControlNet Ex Tap
(1797-TPR)
PA
ControlNet Ex
Adapter
ControlNet Ex
Tap (1797-TPR)
WARNING
The 1797-BCNR barrier module cannot be used in an intrinsically-safe environment after it has been exposed to non-intrinsically-safe signals.
IMPORTANT
For complete installation instructions and requirements, refer to the FLEX Ex Redundant
ControlNet Barrier Module Installation Instructions, publication 1797-5.35.
To install the module:
1. Select the appropriate mounting location.
2. Mount the barrier module on Rockwell Automation part number
199-DR1 DIN rail.
Publication CNET-IN003A-EN-P - January 2006
Install a ControlNet Ex Media System 3-29
3. Ensure the locking tabs snap into place.
IMPORTANT
Connect the ControlNet Ex side of the barrier module to either a 1797-ACNR15 FLEX Ex I/O module or a 1797-TCAP FLEX Ex Safe Tap Dummy
Load using only ControlNet Ex Taps (such as
1797-TPR, 1797-TPYR, 1797-TPS, or 1797-TPYS).
4. Remove the insulator boot from the terminals.
5. Connect the trunk cable as shown in the illustration.
5
In
In
4
3
Channel A
Channel B
1
Out
2
Out
ControlNet Trunk Cables
30502-mdin a. Connect the ControlNet trunk cable to the Channel A output connector (1).
b. Connect the redundant ControlNet trunk cable to the Channel
B output connector (2).
c. Connect the ControlNet trunk cable to the Channel A input connector (3). d. Connect the redundant ControlNet trunk cable to the Channel
B input connector (4).
6. Install a direct ground wire with a minimum diameter of 4 mm 2 between terminal 5 and the PA Ground (Equipotential System) in the hazardous area where the ControlNet Ex coax cable is installed.
IMPORTANT
Do not connect terminal 5 or the DIN rail to a standard earth ground connection in the safe area.
Publication CNET-IN003A-EN-P - January 2006
3-30 Install a ControlNet Ex Media System
Notes:
Publication CNET-IN003A-EN-P - January 2006
1
Appendix
A
Mounting Dimensions
What This Appendix
Contains
Tap Placement
33.02 mm
(1.30 in.)
Use these mounting dimensions to mount your taps, universal mounting brackets, and repeaters.
Make copies of these templates as necessary to help you mark placement for your taps.
T-Tap
35.66 mm
(1.40 in.)
15.24 mm
(0.60 in.)
Y-Tap
30.23 mm
(1.19 in.)
15.24 mm
(0.60 in.)
25.44 mm
(1.00 in.)
31.37 mm
(1.235 in.)
39.37 mm
(1.55 in.)
127 mm (5/16 in.)
Mounting Holes
20168
127 mm (5/16 in.)
Mounting Holes
20169
Publication CNET-IN003A-EN-P - January 2006
A-2 Mounting Dimensions
Universal Mounting
Bracket
30.94 mm
(1.128 in.)
19.05 mm
(0.75 in.)
58.42 mm
(2.30 in.)
49.53 mm
(1.95 in.)
15.47 mm
(0.609 in.)
9.53 mm
(0.375 in.)
20170-m
Publication CNET-IN003A-EN-P - January 2006
Appendix
B
Adjust the Cable Strip Tool
1
What This Appendix
Contains
Calibrate the Cutting
Blades
Follow the instructions in this appendix to calibrate the cable strip tool supplied with the ControlNet Coax Toolkit (1786-CTK).
Use the following procedure to calibrate your cable strip tool to cut
FEP or PVC cable.
1. Turn the three screws outward to back the blades out. This prevents the calibration tool from bottoming out.
2. Place the calibration tool into the cable strip tool with the narrow end installed and facing forward for FEP cable (use the wider end for PVC).
Calibration Tool
FEP
PVC
41892
Adjusting Screws To
Increase the cut depth
Turn The Screw
Clockwise
Decrease the cut depth Counterclockwise
2088-m
3. Tighten the chamber gauge ring so that the calibration tool is locked in place.
4. Continue tightening all the way to the chamber gauge stop.
When aligned properly, the grooves of the calibration tool should align with the blades.
5. Adjust the screws of the memory clip so that the blades just touch the calibration tool.
ATTENTION
Do not over-tighten the screws of the cable strip tool. The blades should not bend, shift, or penetrate the calibration tool.
Publication CNET-IN003A-EN-P - January 2006
B-2 Adjust the Cable Strip Tool
6. Retract the handle of the cable strip tool.
7. Remove the calibration tool from the cable strip tool.
When you have finished, the blade should make a cut of the following dimensions in your cable.
8.3 mm
(0.33 in.)
3.7 mm 4.0
mm
(0.15 in.)
(0.16 in.)
30030-m
First Cut: All Four Shield
Layers-braid/tape/braid/tape
The first cut should cut the outer sheath without cutting the outer wire braid. If the braid is frayed, scored, or cut by the blade, adjust the blade outward slightly to eliminate the fraying.
Second Cut: White
Insulation Or 1st Tape
The second cut should cut the sheath, three outer shields, and possibly the inner tape shield. The insulation can be scored slightly, but should not have a deep cut.
Third Cut: Center Conductor
The third cut should cut all layers of the cable down to the center conductor. This cut should not score the center conductor. If the blade leaves a mark on the conductor, adjust the blade slightly so to eliminate marking the conductor.
The first and second cut adjustments need to be precise. Adjustments as small as 1/12 to 1/8 of a turn can make the difference between a perfect and an imperfect cut.
ATTENTION
Check the outer braid of cable for cut or scored braid wire after stripping the cable. If the braid is damaged, strip the cable again. If needed, adjust the appropriate striper blade by backing the set screw out 1/8 of a turn. Do not crimp the BNC to a damaged braid. This type of mistake accounts for most of the connectivity problems that occur.
Precise, clean connections will reduce network errors.
Publication CNET-IN003A-EN-P - January 2006
Adjust the Cable Strip Tool B-3
Reverse and Replace the
Cutting Blades
To reverse or change the cutting blades:
1. Use a screwdriver to lift the memory blade holder and swing it back.
20182-m
2. Slide the memory blade cartridge out of the strip tool.
20183-m
If You Are
Reversing the memory blade cartridge to use the second set of blades
Go To
The next step
Replacing the memory blade cartridge Step 4
3. Flip the memory blade cartridge and slide it back into the strip tool.
Publication CNET-IN003A-EN-P - January 2006
B-4 Adjust the Cable Strip Tool
Publication CNET-IN003A-EN-P - January 2006
30031-m
Go to step 5.
4. Align the memory blade cartridge (the side with the raised notches) to the raised area on the inside of the strip tool and slide the new memory blade cartridge in .
Raised Notch
Raised Area
30031a-m
TIP
The blades should be on top as you slide the cartridge in.
5. Swing the memory blade holder closed.
20069-m
Adjust the Cable Strip Tool B-5
Change the Memory Blade
Holder
You received two memory blade holders with your cable strip tool; one is for PVC-CL2 cable, and the other is for plenum FEP-CL2P cable.
You need to install the appropriate memory blade holder for the type of cable you are stripping (PVC or FEP).
1. Lift the latches on the memory blade holder and swing it back.
20182-m
2. Snap the memory blade holder off the rod and remove it from the strip tool.
20070-m
3. Position the appropriate memory blade holder on the rod and snap the holder into place.
4. Swing the memory blade holder closed.
20069-m
Publication CNET-IN003A-EN-P - January 2006
B-6 Adjust the Cable Strip Tool
Notes:
Publication CNET-IN003A-EN-P - January 2006
1
Appendix
C
Protect Your System Against Electrostatic
Discharge
Protect the system against electrostatic charge. Post a sign near this module: Attention: Avoid electrostatic charge. For your convenience, we provide some signs you can cut out below.
Post these labels or something similar beside each module to protect the system against electrostatic charge.
Attention: Avoid electrostatic charge.
Attention: Avoid electrostatic charge.
Attention: Avoid electrostatic charge.
Attention: Avoid electrostatic charge.
Publication CNET-IN003A-EN-P - January 2006
C-2 Protect Your System Against Electrostatic Discharge
Notes:
Publication CNET-IN003A-EN-P - January 2006
Index
A
abbreviations and symbols 1-2 about this manual 1-1 application considerations 2-13
B
barrel connector 2-8
BNC cable connectors 1-6, 2-8 installing 3-13 bridge 1-2 bullet connector 2-2, 2-8
C
cable connectors 1-6, 2-8 barrel 2-8 bullet 2-8 installing 3-13 isolated bulkhead 2-8 right-angle 2-8 categories of conductors 2-13 coax cable 2-3
Collect Your Tools 3-13 continuity tester 3-19
ControlNet cable system application considerations 2-13 cable connector bullet 2-2 cable connectors 1-6, 2-8 optional 1-6
Coax Toolkit 3-13 component definitions 1-2 connecting cable sections 3-25 connecting devices 3-27 determine cable needed 2-3 number of repeaters 2-8 number of taps 2-2 number of terminators needed 2-7 trunk cable section lengths 2-4 type of cable connectors needed
2-8 ferrite beads 2-15 installing cable connectors 3-13 trunk cable 3-1 link 2-17 mounting taps 3-2 network 1-2 node 1-4 ordering components 2-17 planning guidelines 2-17 redundant media 2-10 repeater 1-2, 1-7, 2-8 segment 1-7, 2-17 stripping trunk cable 3-14 surge suppression 2-15 tap 1-2, 1-4, 2-2, 2-18 mounting dimensions A-1 terminating segments 3-25 terminator 2-18 terminators 1-3, 2-7 testing for electrical continuity 3-19,
3-24 trunk cable 1-2, 1-5, 2-18 testing 3-19, 3-24 wiring 2-14 wiring external to enclosures 2-14 wiring inside enclosures 2-14 trunk cable section 1-2, 1-5, 2-4 wiring guidelines 2-14
ControlNet Coax Toolkit crimp tool 3-22 knife 3-17 strip gauge 3-18 strip tool 3-14 adjusting the cutting blades B-1 changing the memory blade holder
B-5 crimp tool 3-22
F
FEP cable 1-2 ferrite beads 2-15 flare tool 3-13
I
installing cable connectors stripping the cable 3-17 stripping trunk cable 3-14 isolated bulkhead connector 2-8
L
link planning 2-17
M
media redundant 2-10 guidelines 2-10 mounting dimensions tap A-1
Publication CNET-IN003A-EN-P - January 2006
2 Index
N
NetLinx Media Checker 3-19 node 1-4 changing the memory blade holder B-5 support questions or comments about manual
1-2 technical product assistance 1-2 surge suppression 2-15
O
ohmmeter 3-19 ordering components 2-17
P
programming terminals ways to connect to a ControlNet link 2-3 publications
1770-4.1
2-14
AG-PA002 1-4, 2-8
CNET-IN001 1-1
CNET-IN002 1-1
PVC cable 1-2, 3-1, 3-17
R
redundant media 2-10 guidelines 2-10 repeater 1-2, 1-7, 2-8 selecting where to mount 3-8
RG-6 cable 2-3, 3-1 right-angle connector 2-8
T
tap 1-2, 1-4, 2-18 determine number needed 2-2 mounting 3-2 to a universal mounting bracket 3-4 using the body holes 3-6 mounting dimensions A-1 selecting where to mount 3-2 techniques used in the manual 1-2 terminators 1-3, 2-7 trunk cable 1-2, 1-5 bend radius 3-1 installing 3-1 pull strength 3-1 stripping 3-14 terminating 3-25 testing for shorts and continuity 3-19,
3-24 wiring external to enclosures 2-14, 3-1 wiring inside enclosures 2-14, 3-2 trunk cable section 1-2, 1-5, 2-4, 3-25
S
segment 1-7 planning 2-17 terminating 3-25 strip tool adjusting the cutting blades B-1
W
wiring external to enclosures 2-14, 3-1 inside enclosures 2-14, 3-2 wiring guidelines 2-14
Publication CNET-IN003A-EN-P - January 2006
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Pub. Title/Type ControlNet Ex Media Planning and Installation Manual
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1797-series Pub. No.
CNET-IN003A-EN-P Pub. Date January 2006 Part No.
957208-04
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For more information, contact your local distributor or Rockwell Automation representative, or visit http://support.rockwellautomation.com.
Installation Assistance
If you experience a problem with a hardware module within the first 24 hours of installation, please review the information that's contained in this manual. You can also contact a special Customer Support number for initial help in getting your module up and running:
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Outside United
States
1.440.646.3223
Monday – Friday, 8am – 5pm EST
Please contact your local Rockwell Automation representative for any technical support issues.
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United States
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States
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Please contact your local Rockwell Automation representative for return procedure.
Publication CNET-IN003A-EN-P - January 2006 5 PN 957208-04
Copyright © 2006 Rockwell Automation, Inc. All rights reserved. Printed in the U.S.A.

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Key features
- Intrinsically Safe
- Supports up to 48 taps
- Maximum cable length of 1000m
- Supports redundant media
- Uses fiber repeater hubs for extended distance and star configurations
- Uses coax cable and fiber cable