Allen-Bradley ProcessLogix B Series User manual

Publication 1757-IN092E-EN-P - November 2007
Installation Instructions
ProcessLogix and ControlLogix System
Redundancy Module
Catalog Number 1757-SRM, series B
About This Publication
Use this publication as a guide to install the 1757-SRM, Series B ProcessLogix
and ControlLogix System Redundancy Module into the ProcessLogix or
ControlLogix Redundant chassis pair.
Topic Page
About This Publication 1
Important User Information 2
Environment and Enclosure 4
Prevent Electrostatic Discharge 5
European Hazardous Location Approval 6
About the Module 7
Redundancy System Assembly 11
Using the 1757-SRM Module Relay Terminals 15
Designate the Primary Chassis and Qualify the System 19
Install or Remove the Module Under Power 22
1757-SRM Module Fault Codes and Display Messages 26
Specifications 30
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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) 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 to identify a
hazard, avoid a hazard and recognize the consequences.
SHOCK HAZARD
Labels may be on or inside the equipment, such as a drive or motor, to alert people
that dangerous voltage may be present.
BURN HAZARD
Labels may be on or inside the equipment, such as a drive or motor, to alert people
that surfaces may reach dangerous temperatures.

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North American Hazardous Location Approval
The following information applies
when operating this equipment in
hazardous locations.
Informations sur l'utilisation de cet
équipement en environnements
dangereux.
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.
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.
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.
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.
WARNING AVERTISSEMENT
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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 m (6561 ft) 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.

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Prevent Electrostatic Discharge
Programmable Electronic Systems
Optical Ports
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.
ATTENTION Personnel responsible for the application of safety-related
Programmable Electronic Systems (PES) shall be aware of the safety
requirements in the application of the system and shall be trained in
using the system.
ATTENTION Under certain conditions, viewing the optical port may expose the eye
to hazard. When viewed under some conditions, the optical port may
expose the eye beyond the maximum permissible exposure
recommendations.
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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 LCIE (Laboratoire Central des Industries Electriques) 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 withinits 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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About the Module
Use this illustration to identify the external features of the module.
Before You Begin
Before you install the module, make sure you:
•know how to handle the module.
See Prevent Electrostatic Discharge on page 5.
•understand redundant systems and redundant media.
For additional information, see the ControlLogix Redundancy System
User Manual, publication 1756-UM523.
IMPORTANT If you are using a ProcessLogix system, search for the appropriate
Knowledge Builder documentation at:
http://www.rockwellautomation.com/knowledgebase.
Fiber-
Optic
Port
Front View of 1757-SRM Module with Door Open
Front Panel
Status
Indicators
User Relay
Terminal
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Parts List
You will need these components.
Prepare the Chassis for Module Installation
Before you install the module, you must install and connect a ControlLogix
chassis and power supply.
Chassis Type (series B) Chassis Installation Instructions
1756-A4
Publication 1756-IN080
1756-A7
1756-A10
1756-A13
1756-A17
1757-SRM
Modules
1756-A4, 1756-A7, 1756-A10,
1756-A13, or 1756-A17 Chassis 1756-PA72, 1756-PA75,
1756-PB72, or 1756-PB75
Power Supplies
PRI COM OK
REDUNDANCY MODULE
1757-SRCxxx
Fiber-optic Cable
1756-A7
Chassis
Power
Supply

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Power Supply Power Supply Installation Instructions
1756-PA72/C Publication 1756-IN078
1756-PB72/B
1756-PA75/B Publication 1756-IN596
1756-PB75/B
ATTENTION To comply with UL restrictions, the relay terminals must be powered
from a source compliant with Class 2.
To comply with the CE Low Voltage Directive (LVD), the relay terminals
must be powered from a source compliant with Safety Extra Low
Voltage (SELV) or Protected Extra Low Voltage (PELV).
The line voltage source for the external dc power source to the SRM
Relay Terminals must be the same as that used to power the
energizing SRM Chassis.
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Determine Module Slot Location
Install the 1757-SRM module in the appropriate slot in the ControlLogix
chassis. Slot 0 is the first slot and is always the leftmost slot in the rack.
Installation Requirements
Before you assemble your redundant systems, make sure your redundant
system components are identical. Specifically, these items must match:
•primary and secondary (redundant) control chassis, with all modules
in the exact same order (slot for slot).
•firmware revisions of all module partners.
Chassis Type (series B) Recommended Slot Locations for 1757-SRM Module
1756-A4 1 or 2
1756-A7 4 or 5
1756-A10 5 or 6
1756-A13 4 or 5
1756-A17 5 or 6
IMPORTANT If the primary and secondary (redundant) systems are not
assembled identically, and are not comprised of modules with
matching firmware revisions, the 1757-SRM module cannot qualify
the secondary chassis to the primary chassis.
Power Supply
Slot 0
Slot 1
Slot 2
Chassis
Slot 3
Slot 4
Slot 5
Slot 6
1756-A7 chassis is
shown in this example.

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Redundancy System Assembly
When you assemble the primary and secondary chassis for redundancy, you
assemble them just as you would any ProcessLogix or ControlLogix chassis,
with the exception that for redundancy you need to assemble two identical
chassis.
Connect the Fiber-optic Cable
Prior to installing the 1757-SRM module into the rack, locate the module’s
fiber-optic port and connect one end of the redundancy module cable to it.
For additional information, see the Redundancy Module Cable Installation
Instructions, publication 1757-IN014.
ATTENTION If you are adding redundancy to an already operational ProcessLogix
or ControlLogix system, shut off your process to install the 1757-SRM
module and designate the primary system.
You may also have to use RSNetworx software to configure keeper
information in the secondary ControlNet communication module if the
master keeper for ControlNet communication is in the primary
chassis.
You may also need to enable redundancy in your RSLogix 5000
software application and remove any I/O modules from the chassis.
1757-SRCxx Fiber-optic Cable:
1 m (3 ft), 3 m (9 ft), 10 m (30 ft),
50 m (150 ft), and 100 m (300 ft)
lengths
Fiber-optic Port
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Custom Cables
If you need more than 100 meters (300 feet) of distance between the primary
and secondary controller chassis, use your own custom fiber-optic cable. For a
custom cable:
•limit total light loss through the cable to less than or equal to 7 dB at
1300 nm wavelength.
•limit total cable length to less than or equal to 4 km (2.49 mi).
•use high quality 62.5/125 micron multi-mode fiber-optic cable.
•use professionally-installed SC connectors to connect to the
1757-SRM modules.
Place the Primary and Redundant Modules
Place a 1757-SRM module in corresponding slots in the primary and
redundant chassis. For example, if you place a module in slot five of the
primary chassis, you must place the second module in slot five of the
redundant chassis.
1
2
Circuit Board

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1. Align the circuit board with top and bottom guides in the chassis.
2. Slide the module into the chassis, making sure the module backplane
connector properly connects to the chassis backplane.
The module is properly installed when it is flush with other installed
modules.
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.
IMPORTANT To remove the module, push down on the locking clips at
the top right and bottom left of each module. Slide the
module out of the chassis.
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Wire to the Separable Terminal Block Connector
If you are using your 1757-SRM modules with the user relay, you need to wire
to the separable block connector and plug it into the relay’s terminal.
1. Before attaching the separable terminal block connector to the wiring,
feed the wire through a ferrite core, keeping the ferrite core as close to
the end of the insulation of the wire as possible.
Use the ferrite core manufactured by Steward (part number
28A2029-0A0).
2. Connect the optional field wiring to the separable terminal block
connector and plug it into the user relay terminal.
Refer to Using the 1757-SRM Module Relay Terminals on page 15 for
more information on terminal designations.
WARNING If you connect or disconnect wiring while the field-side
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.
Ferrite Core
User Relay
Terminal

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Using the 1757-SRM Module Relay Terminals
The user relay is available only on the 1757-SRM series B module. The relay
will energize when the module determines that it is in a primary control
chassis. The relay has these three terminals:
•Normally Open (NO)
•Normally Open Contact (NC)
•Chassis Ground Terminal (GND)
Normally Open
The Normally Open contact is located on terminals 1 and 2. The contact is
closed when the relay is energized.
These are the user relay contact ratings:
•Maximum Switching Voltage = 30V dc
•Maximum Switching Current = 100 mA
Chassis Ground Terminal
Terminal 3 is connected to chassis ground. It is intended for use with a
shielded two-conductor cable for field wiring of the Normally Open
connection. Attach the shield to terminal 3. Leave the opposite end of the
shield unconnected. Refer to Specifications on page 30 for a cable listing.
ATTENTION The line voltage source for the external dc power source to the SRM
Relay Terminals must be the same as that used to power the
energizing SRM Chassis.
1
2
3
Normally Open Contact
Shield termination/connection (Functional Earth)
Normally Open Contact
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User-relay Example Application: Connection to an External Switchbox
You can use an external switchbox connected to a user relay on the 1757-SRM
series B module to determine which Logix controller you will attach to the
other RS232 devices on the serial link. You must assemble an external
switchbox to direct serial port devices to one controller of a pair of redundant
Logix controllers. Rockwell Automation does not supply the external
switchbox with the modules.
This example illustrates a connection scheme, with one single-pole
double-throw switch for each RS232 signal. The external power supply output
should not exceed the ratings of the external switchbox coil.
ATTENTION The line voltage source for the external dc power source to the SRM
Relay Terminals must be the same as that used to power the
energizing SRM Chassis.
Use the same line voltage that provides power to Chassis A, to which
user relay connections are made, to provide input power to the
external power supply. If you use the same line voltage and your
system experiences a line failure to your primary chassis and external
power supply, the external switchbox will switch over to Chassis B.
WARNING Failure to use an appropriately rated switchbox may result in an
explosion hazard. When installing this equipment in a Class 1,
Division 2 hazardous location, select an external switchbox that is
appropriately certified for use in this environment.

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External Switchbox Connections to Logix-controller Serial Port
Line
Voltage
Primary Chassis Secondary Chassis
1757-SRM/B
Module
User Relay
RS232
Device
External
Power
Source
Chassis Ground
Terminal
Coil
External Switchbox
One Switch per
Signal Line
NO
NC
NO
NC
Line
Voltage
1757-SRM/B
Module
User Relay
RS232
Device
Chassis Ground
Terminal
To Other RS232
Devices
Required Ferrite Core
User Relay
Terminal
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Flash Upgrade the Modules
To flash upgrade the modules to the latest firmware revision, perform this
procedure.
1. Go to http://support.rockwellautomation.com and download the
latest firmware revision for your 1757-SRM module.
2. Download and install the ControlFLASH Firmware Upgrade Kit.
3. Apply power to only one redundant chassis.
4. Wait for the module to roll display: FACT BOOT FLSH UPDT
REQD.
5. Start your ControlFLASH Firmware Upgrade Kit and apply the latest
firmware to the module.
For additional information on identifying and upgrading your
1757-SRM module, see the ControlFLASH Firmware Upgrade Kit
Quick Start, publication 1756-QS105.
6. Verify that the module displays PRIM, indicating a successful flash
upgrade.
7. Turn off the power to the redundant chassis used in step 3.
8. Apply power to the other redundant chassis.
IMPORTANT Back up any programs or data that you have saved to a device.
When you upgrade firmware, all old data will be overwritten.
IMPORTANT Make sure you know the serial number from your original
firmware disk. To upgrade to the latest firmware revision,
such as 4.x, you will need to provide the original serial
number. If you don’t have the serial number, refer to
Rockwell Automation Support on the back cover.

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9. Wait for the module to roll display: FACT BOOT FLSH UPDT
REQD.
10. Start your ControlFLASH Firmware Upgrade Kit and apply the latest
firmware to the module.
Designate the Primary Chassis and Qualify the System
Once you assemble the chassis, you must designate the primary chassis and
then qualify the system so that all module pairs are at compatible firmware
revision levels.
Designate the Primary Chassis
The chassis that you apply power to first is automatically designated as the
primary chassis. The 1757-SRM module will display PRIM on the module’s
four-character display to acknowledge that this chassis is the primary control
chassis.
IMPORTANT If the flash upgrade is disrupted, cycle power to the chassis. The
module will roll display either FACT BOOT FLSH UPDT REQD or
USER BOOT FLSH UPDT REQD. Repeat the flash upgrade process.
ATTENTION Applying power to the chassis is crucial to designating the primary
and secondary chassis. Do not apply power to the chassis until you
have read the instructions for designating the primary chassis.
Do not attempt to designate a primary chassis without first upgrading
the factory boot firmware on the 1757-SRM module.
Refer to Flash Upgrade the Modules on page 18 before you designate
the primary chassis and qualify the system.
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If both modules are have power applied to simultaneously, the module with
the lowest serial number will be designated as the primary chassis and will
display PRIM on the module’s four-character display. In addition, the PRI
status indicator on the primary 1757-SRM module will be green. On the
1757-SRM module, the normally open (NO) contacts of the user relay will be
closed.
The secondary chassis displays either DISQ or SYNC, depending on the state
of the secondary chassis. In addition, the PRI status light on the secondary
1757-SRM module will not be illuminated. On 1757-SRM module, the NO
contacts of the user relay will be open.
Qualify the System
When you first apply power to the designated primary and secondary chassis,
the redundant system will begin to qualify them. During qualification, the
primary modules are compared with the secondary module partners to verify
that the hardware and firmware are compatible.
If the 1757-SRM module displays Then
SYNC after the chassis has been
started and qualified.
The chassis configuration and the firmware revision
levels are compatible.
DISQ
Important: The secondary
1757-SRM module will initially
display DISQ until it completes the
qualification process. This may take
1
… 3 minutes.
A problem exists:
•with the chassis configuration.
•with incompatible firmware revision levels
between the primary and secondary modules.
See Flowchart of Starting a Chassis with a
Healthy 1757-SRM Module on page 21.
•if the ControlNet-module partners’ Keeper
parameters are not the same.
•if the ControlNet MAC IDs are not set to the
same node address.