Rockwell Automation 1746-XXXX Installation Instructions

Installation Instructions

SLC 500 Digital I/O Modules

Input Catalog Numbers 1746-IA4, 1746-IA8, 1746-IA16, 1746-IB8,

1746-IB16, 1746-IC16, 1746-IG16, 1746-IH16, 1746-IM4, 1746-IM8,
1746-IM16, 1746-IN16, 1746-ITB16, 1746-ITV16, 1746-IV8, 1746-IV16

Output Catalog Numbers 1746-OA8, 1746-OA16, 1746-OAP12, 1746-OB8,
1746-OB6EI, 1746-OB16, 1746-OB16E, 1746-OBP8, 1746-OBP16,
1746-OG16, 1746-OV8, 1746-OV16, 1746-OVP16, 1746-OW4, 1746-OW8,
1746-OW16, 1746-OX8

Combination Input/Output Catalog Numbers 1746-IO4, 1746-IO8,
1746-IO12, 1746-IO12DC

Table of Contents

Topic Page

Important User Information 2

North American Hazardous Location Approval 3

Environment and Enclosure 4

Prevent Electrostatic Discharge 4

Install and Remove the Module 5

Octal Label Kit Installation (for PLC processors only) 6

Wiring Diagrams 17

Apply the Octal Filter Label 6

Apply the Octal Door Label 6

Removable Terminal Blocks 6

Recovery From Blown Fuse/Processor Fault/Processor Shutdown 13

Replacement Fuse Recommendations 13

Replace Fuses 14

Electronically Protected Modules (1746-OB6EI and 1746-OB16E) 14

Specifications 29

2 SLC 500 Digital I/O Modules

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
Automation sales office or online at http://www.rockwellautomation.com/literature/
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.

ATTENTION: 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.

available from your local Rockwell

) describes some important differences

SHOCK HAZARD: Labels may be on or inside the equipment (for example, drive or motor) to alert people
that dangerous voltage may be present.

BURN HAZARD: Labels may be on or inside the equipment (for example, drive or motor) to alert people
that surfaces may reach dangerous temperatures.

IMPORTANT Identifies information that is critical for successful application and understanding of the product.

Overview

In addition to providing the module’s electrical specifications, this document tells you how to:

• install the module into a chassis.

• wire the module’s terminal block.

• install the Octal Filter Label.

Publication 1746-IN027D-EN-P - December 2012

SLC 500 Digital I/O Modules 3

North American Hazardous Location Approval

The following modules are North American Hazardous Location approved: 1746-IA4,
1746-IA8, 1746-IA16, 1746-IB8, 1746-IB16, 1746-IC16, 1746-IG16, 1746-IH16, 1746-IM4,
1746-IM8, 1746-IM16, 1746-IN16, 1746-ITB16, 1746-ITV16, 1746-IV8, 1746-IV16,
1746-OA8, 1746-OA16, 1746-OAP12, 1746-OB8, 1746-OB6EI, 1746-OB16, 1746-OB16E,
1746-OBP8, 1746-OBP16, 1746-OG16, 1746-OV8, 1746-OV16, 1746-OVP16, 1746-OW4,
1746-OW8, 1746-OW16, 1746-OX8, 1746-IO4, 1746-IO8, 1746-IO12, 1746-IO12DC.

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.

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 any component
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
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.

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 tout
composant 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.

Publication 1746-IN027D-EN-P - December 2012

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 60664-1), at altitudes up to 2000 m
(6562 ft) without derating.

This equipment is not intended for use in residential environments and may not provide adequate
protection to radio communication services in such environments.

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 or be approved for the application if
nonmetallic. 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 the following:

• Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1
installation requirements.

• NEMA Standard 250 and IEC 60529, as applicable, for explanations of the degrees of
protection provided by enclosures.

4 SLC 500 Digital I/O Modules

, for additional

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.

Publication 1746-IN027D-EN-P - December 2012

IMPORTANT

Slot 1

A

B

D

C

Max 2 mm

2

(14 AWG)
Max 2 wires per terminal
Max torque: 0.9 Nm (8 lb-in.)

1. Disconnect power.

2. Align the circuit board of module

with the chassis card guide. (A)

3. Slide the module into the chassis
until the bottom tabs lock into place.
(B)

4. Route the wires down and away from
the module, securing them with the
wire tie. (C)

5. Cover all unused slots with Card
Slot Filler, catalog number 1746-N2,
to keep the chassis free from debris.

6. To remove the module, press and
hold the module release located on
each self-locking tab, and slide the
module out of the chassis slot. (D)

Module Installation

Install and Remove the Module

ATTENTION: Never install, remove, or wire modules with power applied to chassis.

The first slot of the chassis is reserved for the processor or the 1747-ASB module.

Follow these steps to install the module:

SLC 500 Digital I/O Modules 5

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6 SLC 500 Digital I/O Modules

TIP

Octal Label Kit Installation (for PLC processors only)

The octal label kit consists of an octal filter label and a door label. Use these octal labels to replace
the decimal labels that are attached to the I/O modules.

The octal label kit can be obtained from your Allen-Bradley distributor. The octal
kit is ordered based on the catalog number of the I/O module.

Please refer to the SLC 500 Modular Hardware Style User Manual, publication

1747-UM011

ATTENTION: Do not touch or remove the terminal block when the SLC 500 system is
powered. Contact with AC line potential may cause injury to personnel.

, for a listing of octal label kit catalog numbers.

Apply the Octal Filter Label

1. Remove the octal filter label from its paper carrier.

2. Align the octal filter label numbers horizontally to the module color bar and over the

decimal filter numbers.
Refer to Installing Octal Labels on page 7 for filter label placement.

3. Apply the octal label to the filter.

4. Press firmly to be sure that the label adheres properly.

Apply the Octal Door Label

1. Remove the octal door label from its paper carrier.

2. Align the octal label directly over the decimal door label on the inside of the door.

Refer to Installing Octal Labels

3. Press firmly to be sure that the label adheres properly.

on page 7 for door label placement.

Removable Terminal Blocks

Colored terminal blocks are removable by loosening the upper and lower retaining screws. Black
terminal blocks are not removable.

Publication 1746-IN027D-EN-P - December 2012

Installing Octal Labels

OCTAL

1746-xxxx (OCTAL)
Octal Door Label

1746-xxxx

Octal Filter Label

Upper retaining screw max torque
= 0.6 Nm (5.3 lb-in.)

Module Color Bar

Lower retaining screw max torque
= 0.6 Nm (5.3 lb-in.)

Removable

Terminal Block

Beveled Edge

Terminal Wiring

Max 2mm

2

(14 AWG)
Max 2 wires per terminal
Max torque: 0.9 Nm (8 lb-in.)

SLC 500 Digital I/O Modules 7

Fuse Protection and Blown Fuse Diagnostics

This section describes fusing characteristics for the following modules:

• 1746-OBP16

• 1746-OVP16

• 1746-OAP12

Fuse Protection (1746-OBP16 and 1746-OVP16 modules)

The fuse on the 1746-OBP16 and 1746-OVP16 modules (shown on Location of Jumpers and

Fuses for 1746-OBP16 and 1746-OVP16 Modules on page 9) provides short-circuit protection

for 13 mm
output channel, it is likely that the transistor associated with that channel will be damaged. In
this event, the module should be replaced or the load moved to a spare output channel.

The fuse does not provide overload protection. In the event of an overload on an output channel,
it is likely that the fuse will not blow and the transistor associated with that channel will be
damaged. To provide overload protection for your application, user-supplied fuses should be
installed externally and properly sized to match your individual load characteristics.

2

(16 AWG) or larger wiring to external loads. In the event of a short circuit on an

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8 SLC 500 Digital I/O Modules

Fuse Protection (1746-OAP12 modules)

A fuse is provided on each common of the 1746-OAP12 module (shown on Location of

Jumpers and Fuses for 1746-OAP12 Module on page 10) for a total of two fuses. The fuses are

designed to protect the module from short-circuit conditions. The fuse does not provide
overload protection. In the event of an overload on an output channel, it is likely that the fuse
will not blow and the output device associated with that channel will be damaged. To provide
overload protection for your application, user-supplied fuses should be installed externally.

The recommended fuse for overload protection is SAN-O HT. Select the fuse rating according
to your load. Do not use HT fuses rated higher than 2.0 Amps.

Blown Fuse Diagnostics

If the fuse blows on the 1746-OBP16, 1746-OVP16, or 1746-OAP12 module, the following
occurs:

• The blown fuse LED indicator will illuminate, provided power (5V DC via backplane
and load power via external supply) is applied to the module.

• A processor error will occur if JP1 connects pins 2 and 3. (See figures on page 9 and

.)

page 10

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SLC 500 Digital I/O Modules 9

F
U
S
E

OUTPUT

WHEN FUSE OPENS

PROCESSOR
CONTINUES

PROCESSOR
FAULT S

REPLACEMENT FUSE
LITTLEFUSE 322010 or 332010

A.B. CAT. NO. 1746-F9

3

2

21

1
2

3

Left side view

Location for 1746-OBP16 Fuse (F1)

Jumper for processor
notification (JP1)

Brown fuse LED
Indicator

Jumper settings and fuse
replacement information

Location for
1746-OVP16
Fuse (F1)

Front view

Location of Jumpers and Fuses for 1746-OBP16 and 1746-OVP16 Modules

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Location of Jumpers and Fuses for 1746-OAP12 Module

12

3

OUTPUT

1

JP1

23

JP1

F
U
S
E

REPLACEMENT FUSE:
SAN-O HQ 6.3A

A-B CAT. NO. 1746-F9

2

WHEN FUSE OPENS

F1

F2

Jumper for Processor
Notification (JP1)

Left side view

PROCESSOR
CONTINUES

PROCESSOR
FAULT

Jumper Settings and
Fuse Replacement Information

Blown Fuse LED
indicator

Front View

10 SLC 500 Digital I/O Modules

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SLC 500 Digital I/O Modules 11

JP1

32 1

JP1

1

2

3

1746-OAP12

1746-OBP16 and 1746-OVP16

JP1 is in Factory Set position. There is no
processor notification for blown fuse.

Processor Operation in Case of Blown Fuse – Processor Continues

The factory set position for JP1 is shown in the following diagram. For this JP1 configuration
the processor operation will continue if the module fuse blows.

Processor Operation in Case of Blown Fuse – Processor Faults

The Processor Fault position for JP1 is shown on the following page. For this JP1 configuration,
the processor generates a nonrecoverable error for all SLC 500 processors. For a nonrecoverable
error, note the following:

• Processor operation halts and the processor fault light flashes.

• All outputs are reset to OFF.

• The processor major fault bit S:1/13 is set.

• Monitor processor status file word S:6 for error code xx58 for SLC 500, and SLC 5/01
processors, and error code xx60 for SLC 5/02 and later processors.

Publication 1746-IN027D-EN-P - December 2012

JP1 in Processor Fault Notification Position

IMPORTANT

JP1 is in processor fault
position. Processor is notified
when fuse is blown.

JP1

1

2

3

1746-OBP16 and 1746-OVP16

1746-OAP12

1

2

3

JP1

When using SLC 5/02 processor and later processors, a user-fault routine
cannot be used to clear the major fault bit.

12 SLC 500 Digital I/O Modules

ATTENTION: For 1746-OBP16 and 1746-OVP16 modules, all outputs on the module are

OFF if the fuse blows. For the 1746-OAP12 module, all outputs on the same common as the
blown fuse are OFF. If processor operation is allowed to continue after a blown fuse,
extreme care should be taken to be sure the safety of personnel and guard against
equipment damage.

For additional information on processor fault codes and user-fault routines refer to the following
publications:

• Your programming device’s reference manual

• HHT User Manual, publication 1747-NP002:

• Chapter 28, Troubleshooting Faults

• Chapter 29, Understanding the Fault Routine

Publication 1746-IN027D-EN-P - December 2012

SLC 500 Digital I/O Modules 13

The following table defines operation of all SLC 500 processors in the case of a blown fuse in
1746-OBP16, 1746-OVP16, and 1746-OAP12 modules.

Processor Operation After a Blown Fuse (1746-OBP16, 1746-OVP16, and
1746-OAP12 modules)

JP1 Set to Processor Continues JP1 Set to Processor Faults

No error. Processor continues with 1746-OBP16
and 1746-OVP16 outputs de-energized.
1746-OAP12 outputs, on the same common as the
blown fuse, are de-energized.

Nonrecoverable error. Processor operations stop and all
outputs reset to OFF.

Recovery From Blown Fuse/Processor Fault/Processor Shutdown

Processor operation will stop under the following conditions:

• The output module fuse blows due to a short circuit.

• JP1 is set to the Processor Faults position (pins 2 and 3 connected).

If the above conditions occur, the following procedures should be used for recovery.

1. Follow fuse replacement procedures described on page 14.

2. Clear the processor major fault bit S:1/13.

3. Clear processor status file S:6 major error code (optional).

4. Return the processor to Run mode.

For additional information on processor fault codes and clearing processor fault bits, refer to the
following user manuals:

• Your programming device’s reference manual

• HHT User Manual, publication 1747-NP002

• Chapter 28, Troubleshooting Fault

• Chapter 29, Understanding the Fault Routine

Replacement Fuse Recommendations

Use the following replacement fuses:

• 1746-OBP16 and 1746-OVP16 modules – Littelfuse #322010,10A or #332010,10A.
This fuse is required to maintain UL/CSA rating. Replacement Fuse Kit is catalog
number
1746-F8 (five fuses per kit).

• 1746-OAP12 module - Use SAN-O HQ 6.3A for replacement. This fuse is required to
maintain UL/CSA rating. Replacement Fuse Kit is catalog number
1746-F9 (five fuses per kit).

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14 SLC 500 Digital I/O Modules

IMPORTANT

Replace Fuses

ATTENTION: Never install, remove, or wire modules with power applied to chassis.

1. Remove SLC 500 system power and correct the conditions causing the short circuit.

2. Remove the output module from the chassis.

3. Remove the fuse.

• 1746-OBP16 and 1746-OVP16 modules: Use a wide-tipped, slotted-head

screwdriver to remove the blown fuse. Slide the screwdriver tip under the fuse and
use a twisting motion to pry the fuse from the fuse clip. Use care so that the printed
circuit board and surrounding electronics are not damaged.

• 1746-OAP12 module: A fuse holder is provided with each fuse. Simply grasp the

fuse holder with needle-nose pliers, or your fingers, and pull it out.

4. Replace the fuse.

• 1746-OBP16 and 1746-OVP16 modules: Center the replacement fuse over the fuse

clip and press down. If you use a tool to press the fuse in place, apply pressure to the
metal end caps only, not the center of the fuse.

• 1746-OAP12 module: Insert a new fuse into the fuse holder, align the fuse holder on

fuse clips, and press down.

5. Replace the output module in the chassis.

6. Restore SLC 500 system power.

7. Clear processor fault bits as indicated in the steps provided on page 13

.

Electronically Protected Modules (1746-OB6EI and 1746-OB16E)

The electronic protection of the 1746-OB6EI and 1746-OB16E modules have been designed to
provide protection for the modules from short circuit and overload current conditions. The
protection is based on a thermal cut-out principle. In the event of a short circuit or overload
current condition on an output channel, that channel will limit current within milliseconds after
its thermal cut-out temperature has been reached. All other channels continue to operate as
directed by the CPU (processor) module.

The modules do not provide protection against reverse polarity wiring or
wiring to ac power sources. Electronic protection is not intended to replace
fuses, circuit breakers, or other code-required wiring protection devices.

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E-FUSE LED Indicator

IMPORTANT

OUTPUT

E
F
U
S
E

E-FUSE LED Indicator

There is no jumper setting on this module.

Front View

Auto Reset Operation

The 1746-OB6EI and 1746-OB16E modules perform auto-reset under overload
conditions. When an output channel overload occurs, that channel will limit
current within milliseconds after its thermal cut-out temperature has been
reached. While in current limit, the output channel can cool below the thermal
cut-out temperature allowing the module to auto-reset and resume control of the
output channel as directed by the processor until the thermal cut-out
temperature is again reached.

Removing power from an overloaded output channel would also allow the output
channel to cool below the thermal cut-out temperature, allowing auto-reset to
occur when power is restored. The output channel would operate as directed by
the processor until the thermal cut-out temperature is again reached.

To avoid auto-reset of an output channel under overload conditions, an external
mechanical fuse can be used to open the circuit when overloaded.

SLC 500 Digital I/O Modules 15

Short Circuit/Overload Current Diagnostics

If a short circuit or overload current condition occurs on an output channel:

• the E-FUSE LED indicator will illuminate provided that power is applied to the module.
Power required: 5V DC via backplane and load power via an external supply.

• all other channels continue to operate as directed by the CPU (processor) module.

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