Installation Instructions
ControlLogix ControlNet Interface Module
Catalog Numbers 1756-CN2, 1756-CN2R, Series B
Top ic Page
Important User Information 2
European Hazardous Location Approval 3
North American Hazardous Location Approval 4
Environment and Enclosure 5
Prevent Electrostatic Discharge 5
The ControlNet Interface Module and Redundant Media 6
Understanding Standalone and Redundant Control 6
Example Redundant System 7
Before You Begin 8
Parts List 8
Identify Module Features 9
Set the Module’s Network Address Switches 10
Reset the Module to the Original Factory Settings 10
Keeper Configuration - Automatic Keeper Crossload 11
Prepare the Chassis for Module Installation 12
Determine Module Slot Location 12
Install the Module 13
Connect the Module to the Network 14
Remove the Module 18
Install or Remove the Module Under Power 18
Install the EDS File 19
Configure RSLinx Software to Use the USB Port 20
Set Up the USB Driver 21
Status Indicators 22
Module Status Indicator and Display 23
ControlNet Channel Status Indicators 29
Specifications 31
Additional Resources 35
2 ControlLogix ControlNet Interface Module
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://literature.rockwellautomation.com
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.
) describes some important differences between solid state
IMPORTANT
ATTENTION
SHOCK HAZARD
BURN HAZARD
Publication
Identifies information that is critical for successful application and understanding of
the product.
Identifies information about practices or circumstances that can lead to personal
injury or death, property damage, or economic loss. Attentions help you identify a
hazard, avoid a hazard and recognize the consequences.
Labels may be on or inside the equipment (for example, drive or motor) to alert people
that dangerous voltage may be present.
Labels may be on or inside the equipment (for example, drive or motor) to alert people
that surfaces may reach dangerous temperatures.
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ControlLogix ControlNet Interface Module 3
European Hazardous Location Approval
European Zone 2 Certification
(The following applies when the product bears the EEx Marking.)
This equipment is intended for use in potentially explosive atmospheres as defined
by European Union Directive 94/9/EC.
The Laboratoire Central des Industries Electriques (LCIE) certifies that this
equipment has been found to comply with the Essential Health and Safety
Requirements relating to the design and construction of Category 3 equipment
intended for use in potentially explosive atmospheres, given in Annex II to this
Directive. Compliance with the Essential Health and Safety Requirements has been
assured by compliance with EN 60079-15.
IMPORTANT
This equipment is not resistant to sunlight or other sources of UV radiation.
This equipment must be installed in an enclosure providing at least IP54 protection
when applied in Class I, Zone 2 environments.
This equipment shall be used within its specified ratings defined by Allen-Bradley.
Provision shall be made to prevent the rated voltage from being exceeded by transient
disturbances of more than 40% when applied in Class I, Zone 2 environments.
This equipment must be used only with ATEX certified backplanes.
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4 ControlLogix ControlNet Interface Module
North American Hazardous Location Approval
The following information applies when
operating this equipment in hazardous
locations.
Products marked "CL I, DIV 2, GP A, B, C, D" are suitable for
use in Class I Division 2 Groups A, B, C, D, Hazardous
Locations and nonhazardous locations only. Each product is
supplied with markings on the rating na meplate indicating
the hazardous location temperature code. When
combining products within a system, the most adverse
temperature code (lowest "T" number) m ay be used to help
determine the overall temperature code of the system.
Combinations of equipment in your system are subject to
investigation by the local Authorit y Having Jurisdiction at
the time of installation.
WARNING
EXPLOSION HAZARD -
• Do not disconnect eq uipment unless
power has been removed or the
area is known to be nonhazardous.
• Do not disconnect connections to
this equipment unless power has
been removed or the area is known
to be nonhazardous. Secure any
external connections that mate to
this equipment by using screws,
sliding latches, threaded
connectors, or other means
provided with this product.
• Substitution of components may
impair suitability for Class I,
Division 2.
• If this product contains batteries,
they must only be changed in an
area known to be nonhazardous.
Informations sur l’utilisation de cet
équipement en environnements dangereux.
Les produits marqués "CL I, DIV 2, GP A, B, C, D" ne
conviennent qu'à une utilisation en environnements de
Classe I Division 2 Groupes A, B, C, D dangereux et non
dangereux. Chaque produit est livré avec des marqua ges sur
sa plaque d'identification qui indiquent le code de
température pour les environnement s dangereux. Lorsque
plusieurs produits sont combinés dans un système, le code de
température le plus défavorable (co de de température le plus
faible) peut être utilisé pour déterminer le code de
température global du système. Les comb inaisons
d'équipements dans le système sont sujettes à inspection pa r
les autorités locales qualifiées au moment de l'installation.
AVERTISSEMENT
RISQUE D’EXPLOSION –
• Couper le courant ou s'assurer
que l'environnement est classé
non dangereux avant de
débrancher l'équipement.
• Couper le courant ou s'assurer
que l'environnement est classé
non dangereux avant de
débrancher les connecteurs. Fixer
tous les connecteurs externes
reliés à cet équipement à l'aide
de vis, loquets coulissants,
connecteurs filetés ou autres
moyens fournis avec ce produit.
• La substitution de composants
peut rendre cet équipement
inadapté à une utilisation en
environnement de Classe I,
Division 2.
• S'assurer que l'environnement est
classé non dangereux avant de
changer les piles.
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Environment and Enclosure
ControlLogix ControlNet Interface Module 5
ATTENTION
This equipment is intended for use in a Pollution Degree 2 industrial environment, in
overvoltage Category II applications (as defined in IEC publication 60664-1), at altitudes
up to 2000 meters (6562 feet) without derating.
This equipment is considered Group 1, Class A industrial equipment according to
IEC/CISPR Publication 11. Without appropriate precautions, there may be potential
difficulties ensuring electromagnetic compatibility in other environments due to
conducted as well as radiated disturbance.
This equipment is supplied as open-type equipment. It must be mounted within an
enclosure that is suitably designed for those specific environmental conditions that will
be present and appropriately designed to prevent personal injury resulting from
accessibility to live parts. The enclosure must have suitable flame-retardant properties to
prevent or minimize the spread of flame, complying with a flame spread rating of 5VA, V2,
V1, V0 (or equivalent) if non-metallic. The interior of the enclosure must be accessible only
by the use of a tool. Subsequent sections of this publication may contain additional
information regarding specific enclosure type ratings that are required to comply with
certain product safety certifications.
In addition to this publication, see:
Industrial Automation Wiring and Grounding Guidelines, for additional installation
requirements, Allen-Bradley publication 1770-4.1.
NEMA Standards publication 250 and IEC publication 60529, as applicable, for
explanations of the degrees of protection provided by different types of enclosure.
Prevent Electrostatic Discharge
ATTENTION
This equipment is sensitive to electrostatic discharge, which can cause internal damage
and affect normal operation. Follow these guidelines when you handle this equipment:
• Touch a grounded object to discharge potential static.
• Wear an approved grounding wriststrap.
• Do not touch connectors or pins on component boards.
• Do not touch circuit components inside the equipment.
• Use a static-safe workstation, if available.
• Store the equipment in appropriate static-safe packaging when not in use.
For additional information, refer to Industrial Automation Wiring and Grounding
Guidelines, publication 1770-4.1.
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6 ControlLogix ControlNet Interface Module
The ControlNet Interface Module and Redundant Media
Use the 1756-CN2 ControlLogix ControlNet series B module if
redundant media is not necessary. Applications requiring redundant
media must use the 1756-CN2R module.
Understanding Standalone and Redundant Control
You can use the 1756-CN2R series B modules for standalone or
redundant control. For standalone control, only one set of modules is
required. For redundant control, two ControlLogix chassis are
populated with identical pairs of modules called partners. The chassis
that performs active control is called the primary chassis and the
modules in the chassis are called primary modules. The other chassis
is called the secondary chassis and the modules in the chassis are
called secondary modules.
These installation instructions discuss both standalone and redundant
control; read them carefully to distinguish the procedures and
requirements for each type of control.
IMPORTANT
If you use redundant control, you must select the same ControlNet
network address for each set of partner modules (primary and
secondary). You must also place the partner modules in the same
corresponding slots in their respective redundant-control chassis
pair.
For more redundancy information, refer to the ControlLogix
Redundancy System User Manual, publication 1756-UM523F.
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Example Redundant System
ControlLogix ControlNet Interface Module 7
Redundant
Control Chassis
Pair
IMPORTANT
Primary
Chassis
Secondary
Chassis
Remote I/O Chassis
1756-RM Module
1756-CN2R Module
1756-RM Module
1756-CN2R Module
1756-CNB/CNBR
1756-CN2 Module
1756-CN2R Module
ControlNet
Network
The 1756-CN2 and 1756-CN2R series B modules are supported in
both the local chassis (primary and secondary) and the remote
chassis (I/O chassis) of a ControlLogix redundancy system,
16.5x.
revision
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8 ControlLogix ControlNet Interface Module
Before You Begin
Before you install the module, make sure you know how to handle
the module. Refer to Prevent Electrostatic Discharge on page 5.
Parts List
You need all of the components shown.
1756-CN2 or 1756-CN2R
Module
COAX
COAX
OK
A
OK
A
B
A
B
A
1756-A4, 1756-A7, 1756-A10,
1756-A13, or 1756-A17 Chassis
1756-PA72, 1756-PA75,
1756-PB72, or 1756-PB75
Power Supply
1786-TPR, 1786-TPS,
1786-TPYR, or 1786-TPYS Taps
(1)
USB Cable (optional)
-
(1)
1786-TPS or 1786-TPYS taps are recommended for network connections.
(2)
1756
-CN2 and 1756-CN2R, series
series B modules use a USB cable for temporary network connections.
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A modules use the 1786-CP cable. However, 1756-CN2 and 1756-CN2R,
(2)
Small Screwdriver
ControlLogix ControlNet Interface Module 9
Identify Module Features
These are the hardware components of the 1756-CN2 and 1756-CN2R
series B bridge modules.
Module Status
Alphanumeric
Display
ControlNet
Channel
Status
Indicators
USB Port
Channel B
BNC Connector
(1756-CN2R only)
COAX
Front View
Module
Status
Indicator
Channel A
BNC Connector
Network Address Switches
(not shown) See page 10.
Side View
Backplane
Connector
00 Factory Reset
on Power Up
(Invalid Network Address)
01 - 99
Normal Operation
(Valid Network Address)
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10 ControlLogix ControlNet Interface Module
Set the Module’s Network Address Switches
Use a small screwdriver to set the module’s network address
switches. For modules in a standalone chassis, you must specify a
unique ControlNet network address. You can select an address of
01...99 for modules in a standalone chassis. Address 00 is an invalid
ControlNet address.
Side of Module
Front of Module
Top of Module
This module’s network
address is 23.
Reset the Module to the Original Factory Settings
To reset the module to its original settings and clear all keeper
information (see page
IMPORTANT
The following procedure instructs you to remove power from the chassis
before removing the module. This is only necessary if the module is in a
Class I, Division 2 hazardous location. For more information, see Install or
Remove the Module Under Power on page 18.
1. Remove power from the chassis.
11), complete the following steps.
2. Remove the module from the chassis.
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3. Reset the switches to 00.
ControlLogix ControlNet Interface Module 11
IMPORTANT
Do not use the 00 switch setting during normal module operation.
4. Replace the module in the chassis.
5. Apply power to the chassis.
6. After the module status display reads, "Reset Complete-Change
Switch Settings," remove power from the chassis.
7. Remove the module from the chassis.
8. Set the switches to their final value.
9. Replace the module in the chassis.
10. Apply power to the chassis.
Keeper Configuration - Automatic Keeper Crossload
The 1756-CN2 series B module is a keeper capable module. This
means that, if the module has a valid configuration and has the
lowest address among the keeper capable nodes on the network, it
becomes the Master Keeper. The Master Keeper is the node that
distributes network configuration information to other nodes as the
network is formed or as nodes are added to the network.
When the module is first removed from the box, or is reset to the
original factory settings, it will automatically attempt to crossload
configuration information from the current Master Keeper. If a Master
Keeper with a valid network configuration is present on the network,
the configuration crossload will succeed; no user configuration is
needed. However, if a Master Keeper does not exist, or does not have
a valid network configuration, you must use RSNetWorx for
ControlNet to download the network configuration information.
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12 ControlLogix ControlNet Interface Module
Prepare the Chassis for Module Installation
Before you install the 1756-CN2 or 1756-CN2R series B module, you
must install and connect a ControlLogix chassis and power supply. A
four-slot chassis with a power supply is shown here.
Power
Supply
Chassis
These modules are compatible with all versions of chassis and power
supplies.
Determine Module Slot Location
Slot 0 is the first slot and is always the leftmost slot in the rack, the
first slot to the right of the power supply. You can use any size
ControlLogix chassis and install the module in any slot. You can also
install multiple bridge modules in the same chassis. You can install as
many modules as your power supply can accommodate, that is, the
number for which the power supply is rated.
Slot 1
Slot 2
Slot 3
Chassis
Slot 0
Power Supply
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ControlLogix ControlNet Interface Module 13
Install the Module
1
Circuit
Board
2
To install the module, perform this procedure.
1. Align the circuit board with top and bottom guides in the
chassis.
2. Slide the module into the chassis.
Make sure the module backplane connector properly connects
to the chassis backplane.
ATTENTION
Do not force the module into the backplane connector. If you cannot
seat the module with firm pressure, check the alignment. Forcing the
module into the chassis can damage the backplane connector or the
module.
The module is properly installed when it is flush with the power
supply or other installed modules.
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14 ControlLogix ControlNet Interface Module
Connect the Module to the Network
You can connect the module to the ControlNet network by using a
tap (catalog number 1786-TPR, 1786-TPS, 1786-TPYR, or 1786-TPYS).
WARNING
If you connect or disconnect the communication cable with power
applied to this module or any device on the network, an electrical arc
can occur. This could cause an explosion in hazardous location
installations.
This example shows a ControlNet network using redundant media.
Redundant Media
(optional)
IMPORTANT
1756-CN2R Module
(in 1756-A4 chassis)
For network connections, we recommend taps with a straight
ControlNet Node
ControlNet Link
ControlNet Node
connector (catalog number 1786-TPS or 1786-TPYS) because of the
location of the BNC connectors on the bottom of the module.
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ControlLogix ControlNet Interface Module 15
Connect the Module to the Network by Using a Tap
To connect the module to the network with a tap, perform this
procedure.
1. Remove and save the dust caps from the ControlNet taps.
ATTENTION
Do not allow any metal portions of the tap to contact any conductive
material. If you disconnect the tap from the module, place the dust
cap back on the straight or right-angle connector to prevent the
connector from accidentally contacting a metallic grounded surface.
Segment 1
Dust Cap
Segment 2
1756-CN2 - Segment 1
1756-CN2R - Segments
1 and 2
Dust Cap
2. Connect the tap’s straight or right-angle connector to the
module’s BNC connector.
If your node supports Then connect the tap’s connector
Non-redundant media
(1756-CN2 module)
Redundant media
To the channel A connector on the module
Channel B on the 1756-CN2R module is not used for
non-redundant media
• From trunkline A to channel A on the 1756-CN2R module
• From trunkline B to channel B on the 1756-CN2R module
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16 ControlLogix ControlNet Interface Module
IMPORTANT
To avoid accidentally reversing the tap connections, before making
your connection, check the tap drop cable for the label indicating
the attached segment. Accidental connection reversals produce
incorrect status displays and require troubleshooting.
To use modules in a redundant-control chassis pair, you must
connect the primary and redundant partner modules to the same
network segment. If you are using redundant media, connect the
channel of each partner to the same network segment.
Segment 1
Segment 2
Tap
A
Tap
B
3. Apply power to the module and check its status.
A
Tap
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ControlLogix ControlNet Interface Module 17
Use this flowchart as a guide.
Turn the chassis
power supply on.
Module status
indicator red?
Yes
Module performs a
self-test
initialization.
Module status
indicator red?
Self-test has failed, and
the module displays an
error message. See
pages 23...29.
TEST
Yes
Replace the
module.
No
See Status Indicators
on page 22.
Self-test is complete.
No
The status indicator
flashes green.
Channel A and B
status indicators
alternately flash.
Module status
displays OK?
Yes
Module is functional
and operating.
OK
A#xx
Channel A and B status
indicators display the
network condition as
listed on page 29.
See the troubleshooting
No
table on page 23.
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18 ControlLogix ControlNet Interface Module
Remove the Module
To remove the module, perform this procedure.
1. Push on the upper and lower tabs to disengage them.
2. Slide the module out of the chassis.
Upper Tab
IMPORTANT
If you are replacing an existing module with an identical one, and
you want to resume identical system operation, you must install the
new module with the same ControlNet address in the same slot.
Install or Remove the Module Under Power
You can install or remove the module while chassis power is applied
if you take these precautions.
WARNING
When you insert or remove the module while backplane power is on, an
electrical arc can occur. This could cause an explosion in hazardous location
installations.
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Be sure that power is removed or the area is nonhazardous before proceeding.
Repeated electrical arcing causes excessive wear to contacts on both the
module and its mating connector. Worn contacts may create electrical
resistance that can affect module operation.
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ControlLogix ControlNet Interface Module 19
Install the EDS File
The EDS file can be uploaded directly from the module. This feature
lets you register the EDS file for your module from within RSLinx
software by following the steps listed below.
1. Open RSLinx software, and browse for the module.
2. Right-click the module and select Upload EDS file from device.
The Upload EDS wizard opens.
3. Complete the EDS wizard to register the EDS file.
The EDS file can also be downloaded from
www.ab.com/networks/eds.html
Hardware Installation Tool.
and installed with the RSLinx EDS
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20 ControlLogix ControlNet Interface Module
Configure RSLinx Software to Use the USB Port
The ControlNet interface module has a USB device port that uses a
Type B receptacle. The port is USB 1.1-compatible and runs at
Mbps. To use the USB port, you must have RSLinx software,
12
version 2.51 or later, installed on your workstation. Use a USB cable
to connect your workstation to the USB port. With this connection,
you can download programs to controllers and configure other
devices, which are accessible by the module, directly from your
workstation.
IMPORTANT
WARNING
WARNING
The USB cable is not to exceed 3.0 m (9.84 ft) and must not contain
hubs.
The USB port is intended for temporary local-programming purposes
only and not intended for permanent connection. If you connect or
disconnect the USB cable with power applied to this module or any
device on the USB network, an electrical arc can occur. This could
cause an explosion in hazardous location installations.
Be sure that power is removed or the area is nonhazardous before
proceeding.
The 1756-CN2 and 1756-CN2R modules, series B, have an industrial
Type B USB port. The port has the same electrical characteristics as
other Type B ports, but a higher cable pull-out rating. For typical
applications in nonhazardous environments, you may use any
high-quality USB cable. If used in a hazardous location, a Samtec Inc.
RSP-119350 USB cable is required to meet the 15-Newton pull test
for hazardous environments.
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ControlLogix ControlNet Interface Module 21
Set Up the USB Driver
To configure RSLinx software to use a USB port, you need to first set
up a USB driver. To set up a USB driver, perform this procedure.
1. Connect your 1756-CN2 or 1756-CN2R module to your
workstation by installing a USB cable in your module’s USB
port.
The Found New Hardware Wizard dialog appears.
2. Click Install the software automatically (Recommended) and
click Next.
The software is installed.
3. Click Finish to set up your USB driver.
4. To view your 1756-CN2 or 1756-CN2R module in RSLinx
software, click the RSWho button.
The RSLinx Workstation organizer appears.
Virtual Chassis Driver
USB Port Driver
Your 1756-CN2 or 1756-CN2R module appears under two
different drivers, a virtual chassis and the USB port. You can
use either driver to browse through your ControlNet module.
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22 ControlLogix ControlNet Interface Module
Status Indicators
The modules have these status indicators.
1756-CN2
Module
COAX
OK
A
1756-CN2R
Module
COAX
A
B
OK
Module Status Display See page 23
Module Status LED
Indicator See page 23
ControlNet Channel Status Indicators See page 29
B
A
A
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ControlLogix ControlNet Interface Module 23
Module Status Indicator and Display
The Module Status indicator and Module Status display provide
diagnostic information.
Indicator
OK
Off None The module is not
Red Reset
Display
Cause Recommended Action
communicating due to a
power supply fault or internal
fault.
Module’s network address is
CompleteChange
Switch
Settings
FAIL This code is displayed when
Backplane
(1)
Init
set to 00, an invalid
ControlNet address.
the power-up test fails.
The module is waiting for the
redundant module to complete
power up.
1. Check the power supply.
2. Check the cable connectors.
3. Make sure the module is
firmly seated in the chassis.
4. If the indicator remains off,
replace the module.
1. Remove power from the
chassis.
2. Remove the module from
the chassis.
3. Set the switches to their
final value. See page 10.
4. Replace the module in the
chassis.
5. Apply power to the chassis.
Replace the module.
None required.
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24 ControlLogix ControlNet Interface Module
Indicator
OK
Red
(cont.)
Flashing
red
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Display
Cause Recommended Action
Stop Service
Received
A non-redundant module is
placed into a redundant
secondary chassis. The
module was commanded to
stop functioning by the
redundancy module
(RM/SRM).
This could occur if a
1756-CN2/R module running
Boot code is inserted into a
chassis along with a
1756-SRM or 1756-RM
module.
For Redundant Control, the
1756-CN2 series B module is
designed to interoperate with a
1756-RM module. It should not be
used with a 1756-SRM module.
Image
update
Needed
DUPLICATE
NODE
DETECTED
Flash in
progress
Boot image running.
Main firmware image needs
to be updated.
The module’s network address
is the same as another
module’s on the link.
Flash update is in progress. No action is required.
If communication to the
module is lost during a Flash
Update, this message will
continue to be displayed even
though the module will not be
able to finish the update.
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1. Remove the non-redundant
module from the redundant
secondary chassis
2. Replace the non-redundant
module with the redundant
module.
1. Insert the module into a
chassis that does not
contain a 1756-SRM or
1756-RM module.
2. Update the module’s
firmware using
ControlFLASH.
Update the module’s firmware
by using the ControlFLASH
utility.
1. Remove power from the
chassis.
2. Remove the module from
the chassis.
3. Set the switches to their
final value. See page 10.
4. Replace the module in the
chassis.
5. Apply power to the chassis.
You must remove power from
the module to recover, and
then flash again.
ControlLogix ControlNet Interface Module 25
Indicator
Display
Cause Recommended Action
OK
Flashing
red (cont.)
TEST Module is executing a
power-up test.
No action is required.
If the display persists for more
than 45 seconds, replace the
module because it has failed.
Green OK This is normal operation. There is at least one
connection to or through the
module. No action is required.
INIT Module is initializing. No action is required.
PAS S This message is displayed
No action is required.
momentarily upon completion
of a successful power-up test.
(1)
CMPT
DSNP
The secondary module is
compatible with its partner.
(1)
The secondary module is
disqualified with no partner.
No action is required.
Check the corresponding slot
of the primary chassis for the
module type and revision.
(1)
PwDS
The module is primary with a
disqualified secondary
Check the type and revision of
the 1756-CN2 module.
partner.
(1)
PQgS
PwQS
PwNS
The module is primary with a
qualifying secondary partner.
(1)
The module is primary with a
qualified secondary partner.
(1)
The module is primary with no
secondary partner.
Redundant system status. No
action is required.
Check corresponding slot of
secondary chassis for correct
module.
(1)
QgS
(1)
QS
A#xx This message is the node
The secondary module is
qualifying.
The secondary module is
qualified.
Redundant system status. No
action is required.
No action is required.
address where xx is an
address from 01...99.
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26 ControlLogix ControlNet Interface Module
Indicator
OK
Green
(cont.)
Green or
flashing
green
Flashing
green
Display
Cause Recommended Action
MACID
SWITCH
ERROR
CPU=xx% This message is the CPU
OK Module is operating normally. No action is required.
OK This is normal operation. No connections to or through
Invalid
Network
Configuration
NET
ERR
Rev xx.xx When you start the module,
Node address switch changed
after you cycled power.
utilization rate where xx is the
amount of CPU used, ranging
from 0...99%. This message
occurs only if the CPU
utilization exceeds 80%.
ControlNet configuration error. Recheck configuration.
A network cabling error exists,
or there are no other active
nodes on the network.
its major and minor revisions
are disclosed, causing this
message to briefly appear.
No action is required, but we
recommend that you either
return switches to their
original settings or replace the
module, since this could
indicate a latent hardware
problem.
No action is required.
the module exist. No action is
required.
Verify that the module’s
network address is less than or
equal to the maximum
unscheduled network address
(UMAX).
Recheck your network cabling
and make sure another node
on the network is active
(online).
No action is required.
Publication
The display shows these
revisions where the major
revision appears to the left of
the decimal point, and the
minor revision to the right.
1756-IN607A-EN-P - February 2008
ControlLogix ControlNet Interface Module 27
Indicator
OK
Any Keeper:
Display
Unconfigured
Keeper:
Unconfigured
(data format
changed)
Keeper:
Unconfigured
(slot
changed)
Keeper:
Unconfigured
(net address
changed)
Cause Recommended Action
The network configuration
data maintained in flash
memory by the keeper object
has been erased or corrupted.
The network configuration
data maintained in flash
memory by the keeper object
is in a format incompatible
with the current revision of
firmware.
After the keeper object’s
network-configuration data
was downloaded, the module
was moved to a different spot
in the rack.
The network address switches
on the module have been
changed since the keeper
object’s network-configuration
data was downloaded.
Perform any of these steps:
• Use RSNetWorx software to
download or update the
keeper object in the module.
• See Reset the Module to
the Original Factory Settings
on page 10.
Perform any of these steps:
• Use RSNetWorx software to
download or update the
keeper object in the module.
• See Reset the Module to
the Original Factory Settings
on page 10.
Perform any of these steps:
• Return the module to the
proper slot.
• Use RSNetWorx software to
download or update the
keeper object in the module.
• See Reset the Module to
the Original Factory Settings
on page 10.
Perform any of these steps:
• Return the network address
switches to their original
setting.
• Use RSNetWorx software to
download or update the
keeper object in the module.
• See Reset the Module to
the Original Factory Settings
on page 10.
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28 ControlLogix ControlNet Interface Module
Indicator
Display
OK
Any
(cont.)
Keeper:
Signature
Mismatch
Keeper:
None Valid
on Network
(1)
Messages are for redundant control.
Cause Recommended Action
The network configuration
data maintained in flash
memory by the keeper object
does not match the current
network configuration.
Use RSNetWorx software to
download or update the keeper
object in the module, or see
Reset the Module to the
Original Factory Settings on
page 10.
There is a valid master keeper
on the network.
The network configuration
data maintained in flash
memory by the keeper object
Use RSNetWorx software to
download or update the keeper
object in the module.
does not match the current
network configuration, and
there is no valid master
keeper on the network.
Important: The Reset the
Module to the Original Factory
Settings procedure on page 10
will not work because there is
no valid master keeper from
which to crossload data.
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ControlLogix ControlNet Interface Module 29
ControlNet Channel Status Indicators
The ControlNet channel status indicators appear in one of these
states:
• Steady - status indicator is on continuously in the defined
state.
• Alternating - while viewed together, the two indicators
simultaneously alternate between the two defined states. The
two indicators are always in opposite states, out of phase.
• Flashing - when each status indicator is viewed apart from the
other, each status indicator alternates between the two defined
states. If both indicators are flashing, they must flash together,
in phase.
ControlNet Indicator States (A AND B)
Cause Action
AND
AB
Off There is no power. No action is required, or apply
power.
Steady red Unit has faulted. Cycle power or reset unit.
Alternating
red/green
Alternating
red/off
A self-test is being conducted. No action is required.
Node has been configured
incorrectly.
If fault persists, contact a
Rockwell Automation
representative or distributor.
Check network address and other
ControlNet configuration
parameters.
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30 ControlLogix ControlNet Interface Module
ControlNet Channel Troubleshooting (A OR B)
Cause Action
OR
AB
Off Channel has been disabled. Program network for redundant
media, if required.
Steady green This is normal operation. No action is required.
Flashing
green/off
Flashing red/off A media fault exists. Check media for broken cables,
(1)
The configuration manager node (keeper) is the node responsible for distributing ControlNet
configuration data to all nodes on the network.
Temporary errors exist. None; unit will self-correct.
Node is not configured to go
online.
Make sure the configuration
manager node (keeper) is present
and working, and the selected
address is not greater than the
maximum unscheduled node
address (UMAX).
(1)
loose connectors, or missing
terminators.
No other nodes are present on
Add other nodes to the network.
the network.
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ControlLogix ControlNet Interface Module 31
Specifications
ControlLogix ControlNet Bridge Module - 1756-CN2, 1756-CN2R, Series B
Attribute Valu e
Connectors
1756-CN2
1756-CN2R
USB port USB 1.1
Recommended USB cable for USB
port
ControlNet communication rate 5 MB
Weight, approx.
1756-CN2
1756-CN2R
North American temperature code T4A
IEC temperature code T4
Number of nodes, max 99
Slot width 1
Connections supported, max 131
Enclosure type rating None (open-style)
1 - ControlNet BNC
2 - ControlNet BNC
USB Device
USB Series B Receptacle
Samtec cable, P/N RSP-199350
0.260 kg (0.57 lb)
0.293 kg (0.64 lb)
Note that 3 of the 131 connections are always
reserved for redundant control. Therefore, 128
connections are available for standard use.
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32 ControlLogix ControlNet Interface Module
ControlLogix ControlNet Bridge Module - 1756-CN2, 1756-CN2R, Series B
Attribute Value
Power dissipation, max
1756-CN2
1756-CN2R
Thermal dissipation, max
1756-CN2
1756-CN2R
Backplane current
1756-CN2
1756-CN2R
5.6 W
6.6 W
19.1 BTU/hr
22.5 BTU/hr
1.1 A @ 5.1V dc
1.3 A @ 5.1V dc
1756-CN2
1756-CN2R
3 mA @ 24V dc
3 mA @ 24V dc
Isolation voltage 30V (continuous)
Basic insulation type
Tested to 500V ac for 60 s, ControlNet network
to system
Wiring category
(1)
Use this Conductor Category information for planning conductor routing. Refer to Industrial
Automation Wiring and Grounding Guidelines, publication 1770-4.1.
Publication
(1)
1756-IN607A-EN-P - February 2008
2 - on communication ports
Environmental Specifications
Attribute Value
Temperature, operating
Temperature, storage
Relative humidity
Vibration
Shock, operating
Shock, nonoperating
Emissions
ESD immunity
Radiated RF immunity
EFT/B immunity
Surge transient immunity
Conducted RF immunity
IEC 60068-2-1 (Test Ad, Operating Cold),
IEC 60068-2-2 (Test Bd, Operating Dry Heat),
IEC 60068-2-14 (Test Nb, Operating Thermal Shock):
0…60 °C (32…140 °F)
IEC 60068-2-1 (Test Ab, Unpackaged Nonoperating Cold),
IEC 60068-2-2 (Test Bb, Unpackaged Nonoperating Dry Heat),
IEC 60068-2-14 (Test Na, Unpackaged Nonoperating Thermal
Shock):
-40…85 °C (-40…185 °F)
IEC 60068-2-30 (Test Db, Unpackaged Damp Heat):
5…95% noncondensing
IEC 60068-2-6 (Test Fc, Operating):
2 g @ 10…500 Hz
IEC 60068-2-27 (Test Ea, Unpackaged Shock):
30 g
IEC 60068-2-27 (Test Ea, Unpackaged Shock):
50 g
CISPR 11:
Group 1, Class A
IEC 61000-4-2:
6 kV contact discharges
8 kV air discharges
IEC 61000-4-3:
10V/M with 1 kHz sine-wave 80%AM from 80…2000 MHz
10V/M with 200 Hz 50% Pulse 100%AM @ 900 MHz
10V/M with 200 Hz 50% Pulse 100%AM @ 1890 MHz
1V/M with 1 kHz sine-wave 80%AM from 2000...2700 MHz
IEC 61000-4-4:
±2 kV @ 5 kHz on ControlNet ports
IEC 61000-4-5:
±2 kV line-earth (CM) on ControlNet ports
IEC 61000-4-6:
10V rms with 1 kHz sine-wave 80%AM from 150 kHz…80 MHz
ControlLogix ControlNet Interface Module 33
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34 ControlLogix ControlNet Interface Module
Certifications
Certification Valu e
Certifications
(when product
is marked)
UL UL Listed Industrial Control Equipment. See UL File E65584.
(1)
UL Listed for Class I, Division 2 Group A,B,C,D Hazardous
Locations. See UL File E194810
cULus UL Listed Industrial Control Equipment, certified for US and
Canada. See UL File E65584.
UL Listed for Class I, Division 2 Group A,B,C,D Hazardous
Locations, certified for U.S. and Canada. See UL File E194810
CSA CSA Certified Process Control Equipment. See CSA File
LR54689C.
CSA Certified Process Control Equipment for Class I, Division 2
Group A,B,C,D Hazardous Locations. See CSA File LR69960C
FM FM Approved Equipment for use in Class I Division 2 Group
A,B,C,D Hazardous Locations
CE European Union 2004/108/EC EMC Directive, compliant with:
EN 61326; Meas./Control/Lab., Industrial Requirements
EN 61000-6-2; Industrial Immunity
EN 61000-6-4; Industrial Emissions
EN 61131-2; Programmable Controllers (Clause 8, Zone A & B)
C-Tick Australian Radio Communications Act, compliant with:
AS/NZS CISPR 11; Industrial Emissions
EEx European Union 94/9/EC ATEX Directive, compliant with:
EN 60079-15; Potentially Explosive Atmospheres, Protection "n"
(Zone 2)
CI ControlNet Int'l conformance tested to ControlNet
specifications
(1)
See the Product Certification link at http://ab.com for Declarations of Conformity, Certificates, and
other certification details.
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ControlLogix ControlNet Interface Module 35
Additional Resources
These documents contain additional information concerning related
Rockwell Automation products.
Resource Description
Industrial Automation Wiring and Grounding
Guidelines, publication
ControlNet Modules in Logix5000 Control Systems
User Manual, publication
ControlLogix Chassis, Series B Installation
Instructions, publication
ControlLogix Power Supplies Installation
Instructions, publication
ControlLogix Power Supplies Installation
Instructions, publication
ControlNet Coax Taps Installation Instructions,
publication
ControlNet Fiber Media Planning and Installation
Guide, publication
ControlNet Coax Media Planning and Installation
Guide, publication
1786-IN007
1770-4.1
CNET-UM001
1756-IN080
1756-IN078
1756-IN596
CNET-IN001
CNET-IN002
Contains general guidelines for
installing a Rockwell Automation
industrial automation system
Contains information on how to use
ControlNet modules with various
Logix5000 controllers
Contains information on how to
install a ControlLogix chassis
Contains information on how to
install ControlLogix power supplies,
1756-PA72 and 1756-BP72
Contains information on how to
install ControlLogix power supplies,
1756-PA75 and 1756-BP75
Contains information on how to
install ControlNet coaxial taps
Contains procedures and
specifications for the installation of
ControlNet fiber media components
Contains general guidelines for the
installation of ControlNet coax media
You can download publications at
http://literature.rockwellautomation.com. To order paper copies of
technical documentation, contact your local sales office or Rockwell
Automation distributor.
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Rockwell Automation Support
Rockwell Automation provides technical information on the Web to assist you
in using its products. At http://support.rockwellautomation.com
technical manuals, a knowledge base of FAQs, technical and application
notes, sample code and links to software service packs, and a MySupport
feature that you can customize to make the best use of these tools.
For an additional level of technical phone support for installation,
configuration, and troubleshooting, we offer TechConnect support programs.
For more information, contact your local distributor or Rockwell Automation
representative, or visit http://support.rockwellautomation.com
Installation Assistance
If you experience a problem 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 product up
and running.
United States 1.440.646.3434
Outside United States Please contact your local Rockwell Automation representative for any
Monday – Friday, 8 a.m. – 5 p.m. EST
technical support issues.
New Product Satisfaction Return
Rockwell Automation tests all of its products to ensure that they are fully
operational when shipped from the manufacturing facility. However, if your
product is not functioning and needs to be returned, follow these procedures.
United States Contact your distributor. You must provide a Customer Support case number
Outside United States Please contact your local Rockwell Automation representative for the return
ControlLogix, Logix5000, RSNetWorx for ControlNet, RSLinx, ControlFLASH, RSNetWorx, Allen-Bradley,
Rockwell Automation, and TechConnect are trademarks of Rockwell Automation, Inc.
Trademarks not belonging to Rockwell Automation are property of their respective companies.
(see phone number above to obtain one) to your distributor in order to
complete the return process.
procedure.
, you can find
.
Publication 1756-IN607A-EN-P - February 2008 PN 953030-04
Copyright © 2008 Rockwell Automation, Inc. All rights reserved. Printed in the U.S.A.
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