Rockwell Automation 1747-BSN User Manual

Backup Scanner Module

Catalog Number 1747-BSN

Installation Instructions

Publication 1747-5.38

2 Backup Scanner Module

Important User Information

Because of the variety of uses for the products described in this publication, those
responsible for the application and use of this control equipment must satisfy
themselves that all necessary steps have been taken to assure that each
application and use meets all performance and safety requirements, including any
applicable laws, regulations, codes and standards.

The illustrations, charts, sample programs and layout examples shown in this
guide are intended solely for purposes of example. Since there are many
variables and requirements associated with any particular installation,
Allen-Bradley does not assume responsibility or liability (to include intellectual
property liability) for actual use based upon the examples shown in this
publication.

Allen-Bradley publication SGI-1.1, Safety Guidelines for the Application,
Installation, and Maintenance of Solid-State Control (available from your local
Allen-Bradley office), describes some important differences between solid-state
equipment and electromechanical devices that should be taken into consideration
when applying products such as those described in this publication.

Reproduction of the contents of this copyrighted publication, in whole or in part,
without written permission of Allen-Bradley Company, Inc., is prohibited.

Throughout this manual we use notes to make you aware of safety
considerations:

ATTEN T I O N :

that can lead to personal injury or death, property damage or economic

!

Attention statements help you to:

• identify a hazard

• avoid the hazard

• recognize the consequences

Important: Identifies information that is critical for successful

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loss.

application and understanding of the product.

Identifies information about practices or circumstances

Backup Scanner Module 3

For More Information

As part of our effort to preserve, protect, and improve our environment,
Allen-Bradley is reducing the amount of paper we use. Less paper means more
options for you. In addition to traditional printed publications and CD-ROM
versions, we now offer on-line materials with the most up-to-date information
you can get. We recommend that you read the related publications listed below
before starting up your control system.

Related Publications

For Refer to this Document Pub. No.

A more detailed description on how to install,
configure, and operate your Backup Scanner.

A more detailed description on how to install
and use your modular SLC 500™ system

A reference manual that contains status file
data and instruction set information for SLC
500 processors.

Backup Scanner
User Manual

SLC 500 Modular Hardware
Style Installation and Operation
Manual

SLC 500™ and MicroLogix™
1000 Instruction Set Reference
Manual

1747-6.22

1747-6.2

1747-6.15

How to Get More Information

If you would like a manual, you can:

• download a free electronic version from the internet at
www.theautomationbookstore.com

• purchase a printed manual by:

– contacting your local distributor or Rockwell Automation representative

– visiting www.theautomationbookstore.com and placing your order

– calling 1.800.963.9548 (USA/Canada) or 001.330.725.1574 (Outside

USA/Canada)

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4 Backup Scanner Module

Safety Considerations

This equipment is UL certified for ordinary locations only. The module is
C-UL certified for use in Class I, Division 2, Groups A, B, C, D, or non­hazardous locations only. The following attention statement applies to use in

hazardous locations.

Explosion Hazard

Class I, Division 2.

power has been switched off, and the area is known to be
non-hazardous.

while circuit is live unless the area is known to be non­hazardous.

Note:

ATTENTION:

• Substitution of components may impair suitability for

!

• Do not replace components or disconnect equipment unless

• Do not connect or disconnect connectors or operate switches

The temperature code rating is marked on the product
label.

Environnements dangereux

Cet équipement est certifié UL pour une utilisation en environnements ordinaires
seulement. Le module est certifié UL Canada pour une utilisation en
environnements de Classe 1, Division 2, Groupes A, B, C, D, ou non dangereux.
La mise en garde suivante s’applique à une utilisation dans des environnements
dangereux.

ATTEN T I O N :

• La substitution de composants peut rendre cet équipement

!

DANGER D’EXPLOSION

impropre à une utilisation en environnement de Classe 1,
Division 2.

Remarque :

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• Couper le courant ou s’assurer que l’emplacement est
désigné non dangereux avant de remplacer les composants.

• Couper l’alimentation ou s’assurer que l’environnement est
classé non dangereux avant de brancher ou débrancher des
connecteurs ou de faire fonctionner des commutateurs.

Le taux du code de température est indiqué sur l’étiquette
du produit.

Backup Scanner Module 5

Overview

The 1747-BSN Backup Scanner Module provides a high-speed communication
channel between two modular SLC 500™ (5/02 or higher) processors. The 1747­BSN backup system uses a set of modules, with one or more 1747-BSN modules
residing in the primary system and one or more complementary modules in the
secondary or backup system. The primary system controls the operation of
remote I/O, while the secondary system monitors communications via the high­speed serial link (HSSL) and is available to take over control in the event of a
fault in the primary system.

The backup scanner has the capability to switch between two communication
channels. The first channel is configurable as Remote I/O (RIO) or Data
Highway Plus™ (DH+). The second channel is used to switch one RS232/485
channel in order to provide connection for electronic operator interfaces.

A backup system using the 1747-BSN modules supports up to eight BSN
modules in each processor chassis, connected by a local status link (LSL). Only I/
O residing in remote chassis is backed up. Local I/O is not backed up. Examples

of RIO and DH+ system configurations are shown in Figures 1 and 2 on page 6.

Note: During the transfer of control from one processor to

another (switchover), the output modules in the remote
chassis maintain their last state until the secondary
processor program takes control. The secondary
processor program is not synchronized with the primary
program.

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