Allen-Bradley 1746-IA4 User manual

Publication 1746-IN027C-EN-P - August 2008
Installation Instructions
Digital I/O Modules
Input Module 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 Module 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 Module Catalog Numbers: 1746-IO4, 1746-IO8,
1746-IO12, 1746-IO12DC
Topic Page
Important User Information 3
Overview 4
Hazardous Location Considerations 4
Environnements Dangereux 5
Install and Remove the Module 5
Octal Label Kit Installation (for PLC processors only) 6
Apply the Octal Filter Label 7
Apply the Octal Door Label 7
Removable Terminal Blocks 7
Fuse Protection and Blown Fuse Diagnostics 8
Fuse Protection (1746-OBP16 and 1746-OVP16 modules) 9
Fuse Protection (1746-OAP12 modules) 9
Blown Fuse Diagnostics 9
Processor Operation in Case of Blown Fuse - Processor Continues 11

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Publication 1746-IN027C-EN-P - August 2008
Processor Operation in Case of Blown Fuse - Processor Faults 12
Recovery From Blown Fuse/Processor Fault/Processor Shutdown 14
Replacement Fuse Recommendations 14
Replace Fuses 15
Electronically Protected Modules (1746-OB6EI and 1746-OB16E) 16
Auto Reset Operation 17
Short Circuit/Overload Current Diagnostics 17
Recovery from Channel Shutdown 17
Wiring Diagrams 18
Labeling for SLC/PLC Systems 18
Input Modules - ac 19
Input Modules - dc 21
Output Modules - ac 23
Output Modules - dc 24
Relay Contact Output Modules 27
Input/Output Combination Modules 28
Specifications 30
General I/O 30
Heat Dissipation 30
Input Modules - ac 32
Input Modules - dc 34
Output Modules - ac 37
Output Modules - dc 38
Relay Contact Output Modules 43
Relay Contact Ratings 44
Input/Output Combination Modules 44

Digital I/O Modules 3
Publication 1746-IN027C-EN-P - August 2008
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 located on or inside the equipment, for example, a drive or motor, to
alert people that dangerous voltage may be present.
BURN HAZARD
Labels may be located on or inside the equipment, for example, a drive or motor, to
alert people that surfaces may reach dangerous temperatures.

4Digital I/O Modules
Publication 1746-IN027C-EN-P - August 2008
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.
Hazardous Location Considerations
This equipment is suitable for use in Class I, Division 2, Groups A, B, C, D or
nonhazardous locations only. The following warning statement applies to use in
hazardous locations.
WARNING EXPLOSION HAZARD
Substitution of components may impair suitability for Class I, Division 2.
Do not replace components or disconnect equipment unless power has been
switched off or the area is known to be nonhazardous.
Do not connect or disconnect components unless power has been switched
off or the area is known to be nonhazardous.
All wiring must comply with N.E.C. article 501-4(b).

Digital I/O Modules 5
Publication 1746-IN027C-EN-P - August 2008
Environnements Dangereux
Cet équipement est conçu pour être utilisé dans des environnements de Classe I,
Division 2, Groupes A, B, C, D ou non dangereux. La mise en garde suivante
s’applique à une utilisation dans des environnements dangereux.
Install and Remove the Module
WARNING DANGER D’EXPLOSION
La substitution de composants peut rendre cet équipement impropre à une
utilisation en environnement de Classe I, Division 2.
Ne pas remplacer de composants ou déconnecter l'équipement sans s'être
assuré que l'alimentation est coupée.
Ne pas connecter ou déconnecter des composants sans s'être assuré que
l'alimentation est coupée.
ATTENTION
Never install, remove, or wire modules with power applied to chassis.
IMPORTANT The first slot of the chassis is reserved for the processor or the 1747-ASB
module.

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Follow these steps to install the module.
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.
TIP 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, for a listing of octal label kit catalog numbers.
Slot 1 A
B
D
C
Max 2 mm2 (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

Digital I/O Modules 7
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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 page 8 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 page 8 for door label placement.
3. Press firmly to be sure that the label adheres properly.
Removable Terminal Blocks
Colored terminal blocks are removable by loosening the upper and lower retaining
screws. Black terminal blocks are not removable.
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.

8Digital I/O Modules
Publication 1746-IN027C-EN-P - August 2008
Installing Octal Labels
Fuse Protection and Blown Fuse Diagnostics
This section describes fusing characteristics for the following modules:
•1746-OBP16
•1746-OVP16
•1746-OAP12
Beveled Edge
Removable
Terminal
Block
Terminal Wiring
Max 2mm2(14 AWG).
Max 2 wires per terminal.
Max torque: 0.9 Nm (8 lb-in).
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)
Octal Door Label
1746-xxxx 1746-xxxx (OCTAL)
Octal Filter Label
OCTAL

Digital I/O Modules 9
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Fuse Protection (1746-OBP16 and 1746-OVP16 modules)
The fuse on the 1746-OBP16 and 1746-OVP16 modules (shown on page 10)
provides short-circuit protection for 13 mm2(16 AWG) or larger wiring to external
loads. In the event of a short circuit on an 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.
Fuse Protection (1746-OAP12 modules)
A fuse is provided on each common of the 1746-OAP12 module (shown on page
11) 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 10 and page 11.)

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Publication 1746-IN027C-EN-P - August 2008
Location of Jumpers and Fuses for 1746-OBP16 and 1746-OVP16 Modules
Location for 1746-OBP16 Fuse (F1)
Jumper for Processor
Notification (JP1) Left Side View
Location for 1746-OVP16 Fuse (F1) WHEN FUSE OPENS
PROCESSOR
CONTINUES
PROCESSOR
FAULTS
REPLACEMENT FUSE:
LITTELFUSE 322010 or 332010
A-B CAT. NO. 1746-F8
Blown Fuse LED
Indicator
Jumper Settings and
Fuse Replacement
Information
JP1
3
2
1
OUTPUT 1
2
32
JP1
F
U
S
E
Front View

Digital I/O Modules 11
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Location of Jumpers and Fuses for 1746-OAP12 Module
Processor Operation in Case of Blown Fuse - Processor Continues
The factory set position for JP1 is shown on page 12. For this JP1 configuration, the
processor operation will continue if the module fuse blows.
1
WHEN FUSE OPENS
2
23
OUTPUT
1
JP1
23
JP1
F
U
S
E
F1
Left Side View
Jumper for Processor
Notification (JP1)
F2
PROCESSOR
CONTINUES
PROCESSOR
FAULTS
REPLACEMENT FUSE:
SAN-O HQ 6.3A
A-B CAT. NO. 1746-F9
Jumper Settings and
Fuse Replacement
Information
Blown Fuse LED
Indicator
Front View

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Publication 1746-IN027C-EN-P - August 2008
JP1 Factory Set Position (no processor notification)
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
5/01 processors, and error code xx60 for SLC 5/02 and later processors.
JP1 is in Factory Set position. There
is no processor notification for
blown fuse.
JP1
32 1
JP1
1
2
3
1746-OAP12
1746-OBP16 and 1746-OVP16

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JP1 in Processor Fault Notification Position
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
IMPORTANT When using SLC 5/02 processor and later processors, a User-fault routine
cannot be used to clear the major fault bit.
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.
JP1 is in processor fault position.
Processor is notified when fuse is
blown.
JP1
3
2
1
32 1
JP1
1746-OBP16 and 1746-OVP16
1746-OAP12

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This table defines operation of all SLC 500 processors in the case of a blown fuse in
1746-OBP16, 1746-OVP16, and 1746-OAP12 modules.
.
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 shown on page 15.
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).
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.

Digital I/O Modules 15
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•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).
Replace Fuses
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 14.
ATTENTION
Never install, remove, or wire modules with power applied to chassis.

16 Digital I/O Modules
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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.
E-FUSE LED Indicator
IMPORTANT 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.
OUTPUT
E
F
U
S
E
OUTPUT
F
U
S
E
Front View
E-FUSE LED Indicator
There is no jumper setting on this module.

Digital I/O Modules 17
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Auto Reset Operation
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.
Recovery from Channel Shutdown
1. Remove the SLC 500 system power and correct the conditions causing the
short circuit or overload current condition.
2. Restore the SLC 500 system power.
The module automatically resets and resumes control of the output channel
and associated load.
IMPORTANT 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.

18 Digital I/O Modules
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Wiring Diagrams
The wiring diagrams in these installation instructions are examples only. It is not
necessary to connect an I/O device to each and every I/O module terminal.
Labeling for SLC/PLC Systems
In this document, 16-point I/O module wiring diagrams include both decimal and
octal numbers for I/O addressing and wire identification (see figure below). To
wire your 16-point I/O module when used in a SLC system, use the decimal
numbers in the upper left portion of each box. When used in a PLC system, use the
octal numbers in the lower right portion of the box.
As shipped from the factory, the I/O module has a decimal address label on
the inside of its door. A separate octal conversion kit can be ordered, to allow
you to convert your module to the octal system.
Decimal and Octal Labeling for 16-point I/O Modules
TIP You can order the octal label kit 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, for a listing of octal label kit catalog numbers.
IMPORTANT Be sure the octal labels are used with your PLC system. Directions on how to
install the labels are included with the kit and on page 6 of this document.
IN 14
16
IN 1
IN 0
IN 2 IN 3
IN 4 IN 5
IN 6 IN 7
IN 9
IN 10 IN 11
IN 12
IN 13
IN 14
IN 15
AC COM AC COM
0
1
2
4
6
IN 8
10
12
14
16
11
13
15
17
3
5
7
L1
L2
PLC
SLC
100/120V ac
1746-IA16
100/120V ac
Internally Connected
Commons
For PLC (octal)
For SLC (decimal)

Digital I/O Modules 19
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Input Modules - ac
Wiring Diagrams (1746-IA4, 1746-IA8, 1746-IA16)
PLC
SLC
IN 1
IN 0
IN 2 IN 3
IN 4 IN 5
IN 6 IN 7
IN 9
IN 10 IN 11
IN 12
IN 13
IN 14
IN 15
AC COM AC COM
0
1
2
4
6
IN 8
10
12
14
16
11
13
15
17
3
5
7
L1
L2
100/120V ac
L1
L2
100/120V ac
IN 0
IN 1
IN 2
IN 3
IN 4
IN 5
IN 6
IN 7
AC COM
AC COM
L1
100/120V ac
NOT
USED
NOT
USED
NOT
USED
NOT
USED
IN 0
IN 1
IN 2
IN 3
AC COM
L2
1746-IA4
100/120V ac 1746-IA8
100/120V ac
Internally Connected
Commons
1746-IA16
100/120V ac
Internally Connected
Commons