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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4 ControlLogix DH-485 Communications Module

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