Rockwell Automation 1756-DH485 Installation Instructions

Installation Instructions

ControlLogix DH-485 Communications Module

Catalog Number(s) 1756-DH485

Inside . . .

For See Page

Identify Module Features 8
Prepare the Chassis for Module Installation 8
Determine Module Slot Location 9
Install or Remove the Module While Power Is Applied 10
Install the Module 11
Connect the Module Channels to the DH-485 Network 12
Apply Chassis Power 14
Check Power Supply and Module Status 15
Interpret the Alphanumeric Display 16
Interpret the LED Status Indicators 17
Set the Network Parameters and Configure the Module 18
Specifications 19

About this Publication

Use this document to install the ControlLogix DH-485 communications
module.

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2 ControlLogix DH-485 Communications Module

S

Important User Information

Solid state equipment has operational characteristics differing from those of electromechanical
equipment. Safety Guidelines for the Application, Insta llat ion and Main te nanc e of So lid Stat e Contr ols
(Publication SGI-1.1 available from your local Rockwell Automation sales office or online at
http://www.literature.rockwellautomation.com) 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 liab le for indir ect or consequen tial damage s
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 th is manual, in whole or in part, without w rit t en p er mis sion 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 practic es or circu mstances th at can cause an explosion in
a hazardous environment, which may lead to personal injury or death, property
damage, or economic loss.

IMPORTANT

ATTENTION

HOCK 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 to identify a
hazard, avoid a hazard and recognize the consequences.

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

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

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ControlLogix DH-485 Communications Module 3

Environment and Enclosure

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 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 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.

NOTE: See NEMA standards publication 250 and IEC
publication 60529, as applicable, for explanations of the degrees
of protection provided by different types of enclosure. Also, see
the appropriate sections in this publication, as well as the
Industrial Automation Wiring and Grounding Guidelines,
publication 1770-4.1 for additional installation requirements
pertaining to this equipment.

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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.

Removal and Insertion Under Power

WARNING

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.

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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ControlLogix DH-485 Communications Module 5

Single-point Serial Communication Connections

WARNING

Be sure that power is removed or the area is nonhazardous before proceeding.

If you connect or disconnect the serial cable with power applied
to this module or the serial device on the other end of the cable,
an electrical arc can occur. This could cause an explosion in
hazardous location installations.

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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 nameplate indicating the hazardous
location temperature code. When
combining products within a system, the
most adverse temperature code (lowest
“T” number) may 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 Authority Having Jurisdiction at
the time of installation.

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
marquages sur sa plaque d'identification qui
indiquent le code de température pour les
environnements dangereux. Lorsque
plusieurs produits sont combinés dans un
système, le code de température le plus
défavorable (code de température le plus
faible) peut être utilisé pour déterminer le
code de température global du système. Les
combinaisons d'équipements dans le système
sont sujettes à inspection par les autorités
locales qualifiées au moment de
l'installation.

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ControlLogix DH-485 Communications Module 7

The following information applies
when operating this equipment in
hazardous locations:

WARNING

EXPLOSION HAZARD
Do not disconnect

equipment 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:

WARNING

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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8 ControlLogix DH-485 Communications Module

Identify Module Features

Use this figure to identify module hardware components.

Module Features

Backplane
Connector

Channel
and
Module
Status
Indicators

Channel A
Connector

Channel B
Connector

Prepare the Chassis for Module Installation

Alphanumeric
Status Indicator

Wiring
Label

43842

Before you install the 1756-DH485 module, you must install and connect a
ControlLogix chassis and power supply.

Power
Supply

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Chassis

43234

ControlLogix DH-485 Communications Module 9

For information on installing these products, refer to the publications listed in
the table Power Supply.

Power Supply

Chassis Type Chassis Power Supply Power Supply

Series B: 1756-A4, -A7, -A10,

-A13, -A17

1756-IN080 1756-PA72 1756-IN078

1756-PB72
1756-PA75 1756-IN596
1756-PB75

Determine Module Slot Location

Figure Slot Locations shows chassis slot numbering in a four-slot chassis. 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 1756-DH485
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 Locations

Slot 1

Slot 2

Slot 3

Slot 0

Power Supply

Chassis

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10 ControlLogix DH-485 Communications Module

Install or Remove the Module While Power Is Applied

You can install or remove the module while chassis power is applied if you
observe the following 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.

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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Install the Module

ControlLogix DH-485 Communications Module 11

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.

POWER

2

Slide the module into the
chassis. Make sure the
module backplane connector
properly connects to the
chassis backplane.

The module is properly installed
when it is flush with the power
supply or other installed modules.

Align the circuit board with top

1

and bottom guides in the chassis.

Circuit board

3

43236

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12 ControlLogix DH-485 Communications Module

Remove or Replace the Module (When Applicable)

Push on upper and

1

lower module tabs
to disengage them.

POWER

POWER

Slide the module out
of the chassis.

2

43237

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 in the
same slot.

Connect the Module Channels to the DH-485 Network

You must use a 1761-NET-AIC Advanced Interface Converter (AIC+) to
connect each channel on the 1756-DH485 module to the DH-485 network.

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ControlLogix DH-485 Communications Module 13

Connect the 1756-DH485 Module to the 1761-NET-AIC Converter

1. Use the 1756-CP3 cable to connect each channel to a 1761-NET-AIC
advanced interface convertor.

2. Connect the right-angle connector end of the cable to the
1761-NET-AIC converter.

Right-angle connector
end of 1756-CP3 cable

6 - DSR
7 - RTS
8 - CTS
9 - N/C

1 - DCD
2 - RXD
3 - TXD
4 - DTR
5 - GND

43843

3. Connect the straight connector end of the cable to the
1761-NET-AIC converter.

1761-NET-AIC Converter

RS-485 connector - see
below for more information
on how to use this

Straight connector end
of 1756-CP3 cable

RS-232 D Shell (port 1)

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43844

14 ControlLogix DH-485 Communications Module

Connect the 1761-NET-AIC Converter to the DH-485 Network

Use the RS-485 connector to connect the 1761-NET-AIC converter to the
DH-485 network. For more information on how to use the 1761-NET-AIC
convertor, see the following publications:

• Advanced Interface Converter (AIC+) and DeviceNet Interface
(DNI) Installation Instructions, publication 1761-IN002

• Advanced Interface Converter (AIC+) User Manual, publication
1761-6.4

Data Highway-485 Communications Connections

WARNING

If you connect or disconnect the DH-485 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.

Be sure that power is removed or the area is nonhazardous
before proceeding.

Apply Chassis Power

ON

POWER

OFF

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ON

POWER

OFF

43845

ControlLogix DH-485 Communications Module 15

Check Power Supply and Module Status

Alphanumeric status indicator illuminates and cycles through a sequence of
messages (described in the Alphanumeric Display Descriptions table).

Module OK status

Power Supply indicator
is green.

At powerup the module’s alphanumeric display begins a cycle through the
following sequences.

• Channel A node address

• Channel A status

• Channel B node address

• Channel B status

This sequence runs continuously during normal module operation.

indicator is solid red,
then flashing green.

43846

EXAMPLE

If your module uses Channel A for DH-485 messaging
with node address 14 and Channel B for DH-485
messaging with node address 20 and the channels are
operating properly, you would see A#14, A OK, B#20,
B OK.

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Troubleshoot the Power Supply

If the alphanumeric indicator on the 1756-DH485 module does not cycle
through these messages when you turn the power on, refer to the Power
Supply Status table and to the Troubleshooting section that follows.

Power Supply Status

POWER Indicator Power Supply Status Recommended Action

Off Not operating. Turn power switch ON.

Check power wiring connections.
Check fuse.

On Operating. None, normal operation.

Interpret the Alphanumeric Display

Your 1756-DH485 module displays alphanumeric codes that provide
diagnostic information about your module. The alphanumeric display flashes
the codes at approximately one second intervals. Table Alphanumeric Display
Descriptions summarizes the codes.

Alphanumeric Display Descriptions

Code Description Recommended Action

OFF
LINE

DUPL
NODE

ONLY
NODE

CNFG
FALT

DH-485 link is in STOP state. Correct the configuration.

Refer to the 1756-DH485 User Manual,
publication 1756-UM532.

DH-485 Duplicate node
address.

Only node on DH-485 link. Check the cables.

Incorrect DH-485 routing table
configuration.

Incorrect DH-485 object
configuration.

Choose another node address and reset
switches.

Correct the configuration. Refer to the
1756-DH485 user manual, pub. 1756-UM532.

Verify the module is inserted in correct slot.

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ControlLogix DH-485 Communications Module 17

Alphanumeric Display Descriptions

Code Description Recommended Action

OK Normal operation for that

channel.

LINK
OFF

??? None

None.

Interpret the LED Status Indicators

The LED status indicators on the module provide information about your
module and the status of each channel. The following tables outline the
indicator condition and the corresponding status, and explain what each
condition means.

Interpret the LED Status Indicators

Module OK Indicator Module Status Recommended Action

Off Not operating. Apply chassis power.

Green flashing Operating but not

Solid Red, then Off Performing

Solid Green Operating and

Solid Red In major fault Reboot module. If red reoccurs, then

Red flashing In major fault or

routing messages.

self-test.

routing messages.

configuration
fault.

Verify module is completely inserted into
chassis and backplane.

None, if no messages are actively being
routed through the module.

To route messages, configure module with
RSLinx software.

None, normal operation.

Verify module configuration.

replace module.
Check alphanumeric indicator and take

action described in the Alphanumeric
Display Descriptions table.

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18 ControlLogix DH-485 Communications Module

LED Actions

Channel A or B
Indicator

Off Not online. Place channel online.
Solid Green Operating. None, normal operation.
Flashing Green No other node on the

Solid Red Hardware fault. Reboot module. If red reoccurs,

Flashing Red Either:

Channel Status Recommended Action

network.

• Faulted adapters
detected.

• Duplicate node
detected

Check cables.

replace module.

• Check cables.
Check power at other racks.

• Check node address.

Set the Network Parameters and Configure the Module

You must use RSLinx software, version 2.43 or later, to set all network
parameters and to configure the 1756DH-485 module.

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ControlLogix DH-485 Communications Module 19

Specifications

ControlLogix DH-485 Communications Module - 1756-DH485
Specifications

Specification Value

Module Location ControlLogix chassis
Maximum Backplane

Current Load
Power Dissipation, Max 4.5 W
Thermal Dissipation, Max 15.4 BTU/hr
Isolation Voltage 50V

Available Communication
Rates

Screw Terminal Torque 0.5...0.6 Nm
Conductors

850 mA @ +5.1V dc and 1.7mA @ 24V dc
from I/O chassis backplane

Tested to withstand 750V dc for 60 s

19.2 Kbps (default) and 9600 Kbps

Wire Size

Category

(1)

Use this Conductor Category information for planning conductor routing. Refer to Industrial
Automation Wiring and Grounding Guidelines, publication 1770-4.1.

Belden 9463 twinaxial

20 AWG (0.519 mm

(1)

2

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20 ControlLogix DH-485 Communications Module

Environmental Specifications

Specification Value

Operational
Temperature

Storage
Temperature

Relative Humidity IEC 60068-2-30 (Test Db, Un-packaged Non-operating Damp

Vibration IEC 60068-2-6 (Test Fc, Operating):

Operating Shock IEC 60068-2-27 (Test Ea, Unpackaged Shock):

Non-operating
Shock

Emissions CISPR 11:

ESD Immunity IEC 61000-4-2:

Radiated RF
Immunity

EFT/B Immunity IEC 61000-4-4:

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, Un-packaged Non-operating Cold),

IEC 60068-2-2 (Test Bb, Un-packaged Non-operating Dry
Heat),

IEC 60068-2-14 (Test Na, Un-packaged Non-operating
Thermal Shock):

-40...85 °C (-40...185 °F)

Heat):

5...95% non-condensing

2 g @ 10...500 Hz

30 g
IEC 60068-2-27 (Test Ea, Unpackaged Shock):

50 g

Group 1, Class A

4 kV contact discharges
8 kV air discharges

IEC 61000-4-3:
10 V/m with 1 kHz sine-wave 80%AM from 80...2000 MHz
10 V/m with 200 Hz 50% Pulse 100%AM at 900 MHz

+/-2 kV at 5 kHz on communications ports

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ControlLogix DH-485 Communications Module 21

Environmental Specifications

Specification Value

Surge Transient
Immunity

Conducted RF
Immunity

IEC 61000-4-5:
+/-1 kV line-earth (CM) on communications ports

IEC 61000-4-6:
10 Vrms with 1 kHz sine-wave 80%AM from 150 kHz...80

MHz

Magnetic Field
Immunity

Enclosure Type

IEC 61000-4-8:
30 A/m at 50 Hz

None (open-style)

Rating

Certifications

Certification Value

Certifications
(when product is marked)

(1)

See the Product Certification link at www.ab.com for Declarations of Conformity, Certificates, and
other certification details.

UL UL Listed Industrial Control Equipment

(1)

CSA CSA Certified Process Control Equipment
CSA CSA Certified Process Control Equipment for Class

I, Division 2 Group A,B,C,D Hazardous Locations

CE European Union 89/336/EEC EMC Directive,

compliant with:
EN 50082-2; Industrial Immunity
EN 61326; Meas./Control/Lab., Industrial

Requirements
EN 61000-6-2; Industrial Immunity
EN 61000-6-4; Industrial Emissions

C-Tick Australian Radiocommunications Act, compliant

with:
AS/NZS CISPR 11; Industrial Emissions

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Additional Resources

This product also has a user manual, publication 1756-UM532. To view it,
visit http://www.rockwellautomation.com/literature

To purchase a manual, you can:

• Contact your distributor or Rockwell Automation representative

• Call 800.963.9548 (USA/Canada) or 001.320.725.1574 (outside

USA/Canada)

ControlLogix, DH+, DH-485, RSLogix 5000, and RSLinx are trademarks of Rockwell Automation, Inc.

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

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Notes:

ControlLogix DH-485 Communications Module 23

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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, you can find 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 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:

United States 1.440.646.3223 Monday – Friday, 8am – 5pm EST
Outside United States Please contact your local Rockwell Automation representative for any

New Product Satisfaction Return

Rockwell 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:

United States Contact your distributor. You must provide a Customer Support case number

Outside United States Please contact your local Rockwell Automation representative for return

technical support issues.

(see phone number above to obtain one) to your distributor in order to
complete the return process.

procedure.

Publication 1756-IN587A-EN-P - September 2005 PN 957782-72

Copyright © 2005 Rockwell Automation, Inc. All rights reserved. Printed in the U.S.A.