Allen-Bradley 1746-IB16, 1746-IA4, 1746-IC16, 1746-IB8, 1746-IH16 Installation Instructions Manual

Discrete I/O Modules

(Catalog Number 1746 Series)

Installation In st ru ct io ns

Input Module Catalog Numbers:
1746-IA4, -IA8, -IA16, -IB8, -IB16, -IC16, -IG16, -IH16, -IM4,

-IM8, -IM16,

-IN16, -ITB16, -ITV16, -IV8, -IV16
Output Module Catalog Numbers:

1746-OA8, -OA16, -OAP12, -OB8, -OB6EI, -OB16, -OB16E,

-OBP8,

-OBP16, -OG16, -OV8, -OV16, -OVP16, -OW4, -OW8, ­OW16, -OX8

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

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2 Discrete I/O Module s

Important User Information

Because of the variety of uses for th e 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, Allen­Bradley does not assume resp onsibility or liability (to in clude 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 M ain tenance 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 cont ent s of t his copy ri ghted pub licati on , in whol e or in part ,
without written permission of A llen-Bradley Company, Inc., is prohibited.

Throughout these installation instructions we use notes to make you aware of
safety considerations:

ATTENTION: Identifies information about practices or
circumstances that can lead to personal injury or death, property

!

Attention statements hel p you to:

• identify a hazard

• avoid the hazard

• recognize the consequences

IMPORTANT : Identifies information that is critical for successful ap plication and

damage or economic loss.

understanding of the product.

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Discrete I/O Modules 3

Table of Contents

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Hazardous Location Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Environnements Dangereux. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

General I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Heat Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Input Modules - ac . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Input Modules - dc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Output Modules - ac . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Output Modules - dc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Relay Contact Output Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Relay Contact Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Input/Output Combination Modules . . . . . . . . . . . . . . . . . . . . . . . .26

Octal Label Kit Installation (for PLC Processors Only) . . . . . . . . . . . . .27

Applying the Octal Filter Label . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Applying the Octal Door Label . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Removable Terminal Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Fuse Protection and Blown Fuse Diagnostics . . . . . . . . . . . . . . . . . . . .29

Fuse Protection (1746-OBP16 and 1746-OVP16) . . . . . . . . . . . . .29

Fuse Protection (1746-OAP12) . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Blown Fuse Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Processor Operation in Case of Blown Fuse - Processor Continues .

32

Processor Operation in Case of Blown Fuse - Processor Faults . .32
Recovery From Blown Fuse/Processor Fault/Processor Shutdown 34

Replacement Fuse Recommendations . . . . . . . . . . . . . . . . . . . . . .34

Fuse Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

Electronically Protected Modules (1746-OB6EI and -OB16E) . . . . . . .36

Electronic Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

Auto Reset Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

Short Circuit/Overload Current Diagnostics . . . . . . . . . . . . . . . . . .37

Recovery From Channel Shutdown . . . . . . . . . . . . . . . . . . . . . . . .37

Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

Labeling for SLC/PLC

Input Modules - ac . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

Input Modules - dc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

Output Modules - ac . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

Relay Contact Output Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

®

Systems . . . . . . . . . . . . . . . . . . . . . . . . . .38

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Input/Output Combination Modules . . . . . . . . . . . . . . . . . . . . . . . .50

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Discrete I/O Modules 5

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
non-hazardous 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 non-hazardous.

• All wiring must comply with N.E.C. article 501-4(b).

Environnements Dangereux

Cet équipement est conçu pour être utilis é dan s d e s 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.

AVERTISSEMENT: DANGER D’EXPLOSION

• La substitution de com posants peut rendre cet équipement
impropre à une utilisation en environnemen t 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.

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6 Discrete I/O Module s

Installation

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.

1. Disconnect power.

2. Align circuit board of
module with 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. To keep the chassis free
from debris, cover all
unused slots with Card Slot
Filler , catalog n umber 174 6­N2.

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

Slot 1

max. #14 AWG (2 mm
max. 2 wires per terminal
max. torque: 0.9 Nm (8
in-lbs)

2

C

B

D

A

)

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Discrete I/O Modules 7

Specifications

General I/O

Table 1: Specifications for All Discrete Modules

Operating Temperature 0°C to 60°C (32°F to 140°F)

(1)

Storage Te mperature -40°C to 85°C (-40°F to 185°F)
Operating Humidity 5% to 95% (noncondensing)
Noise Immunity NEMA standard ICS 2-230

Displacement 0.015 in peak at 5 to 57 Hz

Vibration (Operating)

Acceleration 2.5Gs at 57 to 2000 Hz
30Gs (all modules except relay contact)

Shock (Operating)

10Gs (relay contact modules: -OW, -OX, and
combination I/O modules)

Isolation

(2)

1500V

• UL listed

• CSA certified or C-UL approved as indicated

Agency Certification

by product marking

• CE compliant for all applicable directives
when product or packaging is marked

Hazardous Environment
Class

(3)

Class I, Division 2 Hazardous Environment
UL-A196, CSA, C-UL

(1)Exceptions are indicated with certain modules.
(2)Electro-optical isolation between I/O terminals and control logic.
(3)Some modules are classified Class 1, Division 2 by CSA only or C-UL only as shown in

the specification table for the respective module.

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8 Discrete I/O Module s

Heat Dissipation

The following tables contain values for the heat dissipated by each I/O module.

Use them to calculate the total amount of heat diss ipated by your SLC 500™
control system. For details on how to calculate total heat dissipation, refer to the
SLC 500 Modular Hardware Style Installation and Operation Manual,
publication 174 7-6 .2. Pl eas e note th e fol lo wing definitions:

• Watts per Point - the heat dissipation that can occur in each field wiring
point when energized at nominal voltage.

• Minimum Watts - the amount of heat dissipation that can occur when there
is no field power present.

• Total Watts - the watts per point multiplied by the number of points, plus the
minimum watts (with all points energized).

Table 2: Input Module Heat Dissipation

Catalog Numbers Watts per Point Minimum Watts Total Watts

1747-IA4 0.27 0.175 1.30
1746-IA8 0.27 0.250 2.40

1746-IA16 0.27 0.425 4.80

1746-IB8 0.20 0.250 1.90

1746-IB16 0.20 0.425 3.60
1746-IC16 0.22 0.425 3.95
1746-IG16 0.02 0.700 1.00
1746-IH16 0.32 0.217 5.17

1746-IM4 0.35 0.175 1.60
1746-IM8 0.35 0.250 3.10

1746-IM16 0.35 0.425 6.00

1746-IN16 0.35 0.425 6.00
1746-ITB16 0.20 0.425 3.60
1746-ITV16 0.20 0.425 3.60

1746-IV8 0.20 0.250 1.90

1746-IV16 0.20 0.425 3.60

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Discrete I/O Modules 9

Table 3: Output Module Heat Dissipation

Catalog Numbers Watts per Point Minimum Watts Total Watts

1746-OA8 1.000 0.925 9.00

1746-OA16 0.462 1.850 9.30

1746-OAP12 1.000 1.850 10.85

1746-OB6EI 0.440 0.230 2.90

1746-OB8 0.775 0.675 6.90

1746-OB16 0.388 1.400 7.60

1746-OB16E 0.150 0.675 3.07

1746-OBP8 0.300 0.675 3.08

1746-OBP16 0.310 1.250 6.26

1746-OG16 0.033 0.900 1.50

1746-OV8 0.775 0.675 6.90

1746-OV16 0.388 1.400 7.60

1746-OVP16 0.310 1.250 6.26

1746-OW4 0.133 1.310 1.90
1746-OW8 0.138 2.590 3.70

1746-OW16 0.033 5.170 5.70

1746-OX8 0.825 2.590 8.60

Table 4: Combination Input/Output Module Heat Dissipation

Catalog Numbers Watts per Point Minimum Watts Total Watts

0.27 per input point

1746-IO4

0.75 1.60

0.133 per outp ut poi nt

0.27 per input point

1746-IO8

1.38 3.00

0.133 per outp ut poi nt

1746-IO12

1746-IO12DC

0.27 per input point

2.13 4.60

0.133 per outp ut poi nt

0.20 per input point

1.84 3.90

0.133 per outp ut poi nt

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10 Dis cre te I/ O Mod ule s

Input Modules - ac

Table 5: Specifications for Input Modules 1746-IA4, -IA8, and -IA16

Catalog Number 1746-

Specification

IA4 IA8 IA16

Voltage Category 100/120V ac Signal Input
Number of Inputs 4816
Points per Common 4816
Operating Voltage 85 to 132V ac at 47 to 63 Hz

(1)

Backplane Current
Consumption

Signal Delay (max.)

5V dc 0.035A 0.050A 0.085A
24V dc 0.0A

on = 35 ms
off = 45 ms

Off State Voltage (max.) 30V ac
Off State Current (max.) 2 mA
Nominal Input Current at 120V

ac
Inrush Current (max.)

(2)

Inrush Current Time Duration
(max.)

(1)Removable Terminal Block.
(2)An ac input device must be compatible with SLC 500 input circuit inrush current. A

current limiting resistor can be used to limit inrush current; however, the operating
characteristics of the ac incircuit will be affected.

12 mA

0.8A

0.5 ms

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Table 6: Specifications for Input Modules 1746-IM4, -IM8, and -IM16

Catalog Number 1746-

Specification

IM4 IM8 IM16

Voltage Category 200/240V ac Signal Input
Number of Inputs 4816
Points per Common 4816
Operating Voltage 170 to 265V ac at 47 to 63 Hz

(1)

Backplane Current
Consumption

Signal Delay (max.)

5V dc 0.035A 0.050A 0.085A
24V dc 0.0A

on = 35 ms
off = 45 ms

Off State Voltage (max.) 50V ac
Off State Current (max.) 2 mA
Nominal Input Current at 240V ac 12 mA
Inrush Current (max.)
Inrush Current Time Duration

(max.)

(1)Removable Terminal Block.
(2)An ac input device must be compatible with SLC 500 input circuit inrush current. A current

limiting resistor can be used to limit inrush current; however, the operating characteristics
of the ac input circuit will be affected.

(2)

1.6A

0.5 ms

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12 Dis cre te I/ O Mod ule s

Input Modules - dc

Table 7: Specifications for Input Modules 1746-IB8, -IB16, -ITB16, and -IC16

Catalog Number 1746-

Specification

IB8 IB16

Voltage Category 24V dc Signal Input (sinking)

Number of Inputs 816 16 16
Points per Common 816 16 16

Operating Voltage 10 to 30V dc (sinking)

(1)

ITB16

(1)

IC16

48V dc

Signal Input

(sinking)

30 to 60V dc at 55°C
30 to 55V dc at 60°C

(sinking)

(1)(2)

Backplane

5V dc 0.050A

Current
Consumptio
n

Signal Delay (max.)

Off State Voltage
(max.)

Off State Current
(max.)

Nominal Input
Current

(1)Removable Terminal Block.
(2)Use ID Code 0509 when configuring your system with programming software or the HHT.
(3)Typical signal delay for these modules: ON = 0.1 ms, OFF = 0.25 ms at 24V dc.

24V dc 0.0A

on = 8

ms

off = 8 ms

on = 8

ms

off = 8 ms

on = 0.3 ms

off = 0.5

(3)

ms

5.0V dc 10.0V dc

1 mA 1 mA 1.5 mA 1.5 mA

8 mA at 24V dc 4.1 mA at 48V dc

on = 4 ms
off = 4 ms

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Discrete I/O Modules 13

Table 8: Specifications for Input Modules 1746-IV8, -IV16, and -ITV16

Catalog Number 1746-

Specification

IV8 IV16

Voltage Category 24V dc Signal Input (sourcing)
Number of Inputs 81616
Points per Common 81616
Operating Voltage 10 to 30V dc (sourcing)

(1)

ITV16

(1)

Backplane Current
Consumption

Signal Delay (max.)

5V dc 0.050A 0.085A 0.085A
24V dc 0.0A

on = 8 ms
off = 8 ms

on = 8 ms
off = 8 ms

on = 0.3 ms

off = 0.5 ms

Off State Voltage (max.) 5.0V dc
Off State Current (max.) 1 mA 1 mA 1.5 mA
Nominal Input Current at

24V dc

(1)Removable Terminal Block.
(2)Typical signal delay for these modules: ON = 0.1 ms, OFF = 0.25 ms at 24V dc.

8 mA

(2)

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14 Dis cre te I/ O Mod ule s

Table 9: Specifications for Input Module 1746-IG16

Specification 1746-IG16

Voltage Category 5V dc TTL Signal Input (sourcing)
Number of Inputs 16
Points per Common 16

Operating Voltage

Backplane Current
Consumption

Signal Delay (max.)

Off State Voltage (max.)
Off State Current (max.) 4.1 mA
Nominal Input Current at 5V dc 3.7 mA

(1)Removable Terminal Block.

5V dc 0.140A
24V dc 0.0A

4.5 to 5.5V dc (sourcing)

50 mV peak to peak ripple (max.)

on = 0.25 ms
off = 0.50 ms

2.0V dc

(1)

(2)

(2)TTL inputs are inverted (-2.0 to +0.8V dc = low voltage = True = ON). Use a NOT

instruction in your ladder program to convert to traditional True = High logic.

ATTENTION: To avoid potential damage to TTL modules,
handle them by the ends of the module, not metallic surfaces.
Electrostatic discharges can damage the module. Care should be

!

taken to prevent exposure of terminals or components to
electrostatic charges.

Careful wire routing within the enclosure helps cut down electrical noise between
I/O lines. Refer to the SLC 500 Modular Hardware Style Installation and
Operation Manual, publication 1747-6.2, for recommended wiring pro cedures
for TTL modules.

Cable Length - Limit cable length to 15 meters (50 feet) per point for inputs in
standard enviro nments. R efer to Allen-Bradley Pr ogrammable Controller Wiring
and Grounding Guidelines, publication 1770-4.1, for complete information.

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Table 10:Specifications for Input Module 1746-IN16

Specification 1746-IN16

(1)

Voltage Category 24V ac/dc Signal Input
Number of Inputs 16
Points per Common 16

dc 10 to 30V dc (sinking)

Operating Voltage

ac 10 to 30V ac

Backplane Current
Consumption

5V dc 0.085A
24V dc 0.0A

dc

on = 15 ms
off = 15 ms

Signal Delay (max.)

ac

on = 25 ms
off = 25 ms

dc 3.0V dc

Off State Voltage (max.)

ac 3.0V ac
dc 1 mA

Off State Current (max.)

ac 1 mA
dc 8 mA at 24V dc

Nominal Input Current

ac 8 mA at 24V ac

Inrush Current (max.) 0.02A (ac only)

(1)Removable Terminal Block.

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16 Dis cre te I/ O Mod ule s

Table 11:Specifications for Input Module 1746-IH16

Specification 1746-IH16

(1)(2)(3)

Voltage Category 125V dc Signal Input (sinking
Number of Inputs 16
Points per common 16

Range:

• 90 to 146V dc

Operating Voltage

Max. Points O N Simult aneo usly :

• 16 at 146V dc and 30°C

• 12 at 146V dc and 50°C

• 14 at 132V dc and 55°C

• 16 at 125V dc and 60°C

Backplane

5V dc 0.085A

Current
Consumption

Signal Delay (max.)

24V dc 0.0A

on = 9 ms
off = 9 ms

Off State Voltage (max.) 20 .0V dc
Off State Current (max.) 0.8mA

Nominal Input Current

2.15 mA at 125V dc

2.25 mA at 132V dc

(1)Removable Terminal Block.
(2)Use ID Code 0507 when configuring your system with programming software or the HHT.
(3)If the input module is connected in parallel with an inductive load, use surge suppression

across the load to protect the input module from damage caused by reverse voltage.
Refer to the
publication 1747-6.2, for more information on surge suppression.

SLC 500 Modular Hardware Style Installation and Operation Manual

,

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Discrete I/O Modules 17

Output Modules - ac

Table 12:Specifications for Output Modules 1746-OA8, -OA16, and -OAP12

Catalog Number 1746-

Specification

OA8 OA16

(1)

OAP12

(1)(2)(3)

(4)

Voltage Category 120/240V ac Signal Input
Number of Outputs 81612
Points per Common 486
Operating Voltage 85 to 265V ac at 47 to 63 Hz

Backplane Current
Consumption

Max. Signal Delay, Resistive

(5)

Load
Off State Leakage (max.)

5V dc 0.185A 0.370A 0.370A
24V dc 0.0A

on = 1 ms, off = 11.0 ms

(6)

2 mA

Load Current (min.) 10 mA

Continuous Current per

(7)

Point

1.0A at 30°C

0.50A at 60°C

0.50A at 30°C

0.25A at 60°C

2.0A at 30°C

1.25A at 55°C

1.0A at 60°C

Continuous Current
per Module (max.)

8.0A at 30°C

4.0A at 60°C

On State Voltage Drop (max.) 1.50V at 1.0A
Surge Current per Point

(8)

10.0A for 25 ms10.0A for 25

(max.)

(1)Removable Terminal Block.
(2)A fused common and blown fuse LED are provided on this module. See “Fuse Protection

and Blown Fuse Diagnostics” on page 32.
(3)Use ID Code 2803 when configuring your system with programming software or the HHT.
(4)Certified for Class 1, Division 2 hazardous location by CSA.
(5)Triac outputs turn on at any point in the ac line cycle, and turn off at ac line zero cross.
(6)To limit the effects of leakage current through solid state outputs, a loading resistor can

be connected in parallel with your load. For 120V ac operation, use a 15K

For 240V ac operation, use a

15K Ω, 5W resistor.

8.0A at 30°C

4.0A at 60°C

1.50V at

0.50A

ms

9.0A at 30°C

6.0A at 60°C

1.2V at 2.0A

17.0A for 25

(9)

ms

Ω,

2W resistor.

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18 Dis cre te I/ O Mod ule s

(7)Recommended surge suppression: For triac outputs when switching 120V ac inductive

loads, use Harris Metal-Oxide Varistor, model number V220MA2A. Refer to the

Modular Hardware Style Installation and Operation Manual

more information on surge suppression.
(8)Repeatability is once every 1s at 30°C. Repeatability is once every 2s at 60°C.

(9)Surge current = 35A per common for 10 ms.

, publication 1747-6.2, for

SLC 500

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Discrete I/O Modules 19

Output Modules - dc

Table 13:Specifications for Output Modules 1746-OB8, -OB16, and -OB16E

Catalog Number 1746-

Specification

OB8 OB16

Number of Outputs 81616
Points per Common 81616
Voltage Category 24V dc Signal Output

(1)

OB16E

(1)(2)

Operating Voltage (V dc) 10 to 50 (source)

Backplane Current
Consumption

Signal Delay (max.).
Resistive Load.

Off State Leakage (max.)

5V dc 0.135A 0.280A 0.135A
24V dc 0.0A

on = 0.1 ms
off = 1.0 ms

(4)

on = 0.1 ms
off = 1.0 ms

1 mA

10 to 30
(source)

on = 1.0 ms

off = 1.0 ms

(3)

Load Current (min.) 1 mA
Continuous Current per

(5)

Point
Continuous Current per

Module

1.0A at 30°C

0.50A at 60°C

8.0A at 30°C

4.0A at 60°C

0.50A at 30°C

0.25A at 60°C

8.0A at 30°C

4.0A at 60°C

1.0A at 30°C

0.50A at 60°C

8.0A at

0 to 60°C

On State Voltage Drop (max.) 1.2V at 1.0A 1.2V at 0.50A 1.0V at 0.50A

Surge Current per Point

(7)

3.0A for 10 ms 3.0A for 10 ms

2.0A for 10

(8)

ms

(6)

(1)Removable Terminal Block.
(2)Use the following ID Code when configuring your system with programming software or

the HHT: 1746-OB16E = 2920.
(3)Fa st turn-off modules (1746-OB6EI, -OBP8 Series B and later, -OB16E Series B and

later, -OBP16, and

-OVP16) provide fast OFF delay for inductive loads. Comparative OFF delay times for

1746-OB8/-OV8 and fast turn-off modules, when switching Bulletin 100-B110 (24W

sealed) contactor, are: 1746-OB8/-OV8 OFF delay = 152 ms; fast turn-off modules OFF

delay = 47 ms.
(4)To limit the effects of leakage current through solid state outputs, a loading resistor can

be connected in parallel with your load. For transistor outputs, 24V dc operation, use a

5K Ω, 1/2W resistor.

Publication 1746-IN005A-US-P

20 Dis cre te I/ O Mod ule s

(5)Recommended surge suppression: For transistor outputs when switching 24V dc

inductive loads, use a 1N4004 diode reverse-wired across the load. Refer to the

Modular Hardware Style Installation and Operation Manual

more information on surge suppression.
(6)Fa st off delay for inductive loads is accomplished with surge suppressors on the 1746-

OB6EI, -OBP8 Series B and later, -OB16E Series B and later, -OBP16, and -OVP16

modules. A suppressor at the load is not needed unless another contact is connected in

series. If this is the case, a 1N4004 diode should be reverse wired across the load. This

defeats the fast turn-off feature.
(7)Repeatability is once every 1s at 30°C. Repeatability is once every 2s at 60°C.

(8)Surge current = 32A per module for 10 ms.

, publication 1747-6.2, for

SLC 500

ATTENTION: A transient pulse occurs in transistor outputs
when the external dc supply voltage is applied to the output
common terminals (e.g., via the master control relay). This can

!

occur regardless of the processor having power or not. For most
applications, the energy of this pulse is not sufficient to energize
the load. Refer to the SLC 500 Modular Hardware Style
Installation and Operation Manual, publication 1747-6.2, for
more information on transien t pul s es and gui deli nes to reduce
inadvertent processor operation.

Publication 1746-IN005A-US-P

Discrete I/O Modules 21

T ab le 14:Specificatio ns for Outp ut Module s 1746-OB 6EI, -OBP8, an d -OBP16

Catalog Number 1746-

Specification

OB6EI

(1)(2)

OBP8

(1)(2)(3)

OBP16

(1)(2)(4)

(5)

Number of Outputs 6816
Points per Common

Individually

Isolated

416

Voltage Category 24V dc Signal Output
Operating Voltage (V dc)

Backplane Current
Consumption

5V dc 0.046A 0.135A 0.250A
24V dc 0.0A

Signal Delay (max.).
Resistive Load.

Off State Leakage (max.)

(7)

10 to 30
(source)

on = 1.0 ms

off = 2.0 ms

(6)

20.4 to 26.4 (source)

on = 1.0 ms

(6)

off = 2.0 ms

1 mA

on = 0.1 ms

off = 1.0 ms

(6)

Load Current (min.) 1 mA
Continuous Current per

(8)(9)

Point

2.0A at 0 to

60°C

2.0A at 0 to
60°C

1.5A at 30°C

1.0A at 60°C

Continuous Current per
Module

On State Voltage Drop
(max.)

Surge Current per Point
Surge Current per

Module

(10)

12.0A at 0 to

1.0V at 2.0A 1.0V at 2.0A 1.0V at 1.0A

(10)

4.0A for 10 ms 4.0A for 10 ms 4.0A for 10 ms

24.0A for 10 ms

60°C

8.0A at 0 to
60°C

32.0A for 10 ms32.0A for 10

6.4A at

0 to 60°C

ms

Electronic Protection yes no no

(1)Removable Terminal Block.
(2)Use the following ID Code when configuring your system with programming software or

the HHT: 1746-OB6EI = 2619, 1746-OBP8 = 2721 and 1746-OBP12 = 2921.

(3)An external fuse can be used to protect this module from short circuits. Recommended

fuse is SANO MQ4-3.15A, 5x20 mm.

(4)A fused common and blown fuse LED are provided on this module. See “Fuse Protection

and Blown Fuse Diagnostics” on page 32.

(5)Certified for Class 1, Division 2 hazardous location by CSA.

Publication 1746-IN005A-US-P

22 Dis cre te I/ O Mod ule s

(6)Fa st turn-off modules (1746-OB6EI, -OBP8 Series B and later, -OB16E Series B and

later, -OBP16, and

-OVP16) provide fast OFF delay for inductive loads. Comparative OFF delay times for
1746-OB8/-OV8 and fast turn-off modules; when switching Bulletin 100-B110 (24W
sealed) contactor, are: 1746-OB8/-OV8 OFF delay = 152 ms; fast turn-off modules OFF
delay = 47 ms.

(7)To limit the effects of leakage current through solid state outputs, a loading resistor can

be connected in parallel with your load. For transistor outputs, 24V dc operation, use a

5.6K Ω, 1/2W resistor.

(8)Recommended surge suppression: For transistor outputs when switching 24V dc

inductive loads, use a 1N4004 diode reverse-wired across the load (also see footnote 9).
Refer to the
publication 1747-6.2, for more information on surge suppression.

(9)Fa st off delay for inductive loads is accomplished with surge suppressors on the 1746-

OB6EI, -OBP8 Series B and later, -OB16E Series B and later, -OBP16, and -OVP16
modules. A suppressor at the load is not needed unless another contact is connected in
series. If this is the case, a 1N4004 diode should be reverse wired across the load. This
defeats the fast turn-off feature.

(10)Repeatability is once every 1s at 30°C. Repeatability is once every 2s at 60°C.

SLC 500 Modular Hardware Style Installation and Operation Manual

,

!

ATTENTION: A transient pulse occurs in transistor outputs

when the external dc supply voltage is applied to the output
common terminals (e.g., via the master control relay). This can
occur regardless of the processor having power or not. For most
applications, the energy of this pulse is not sufficient to energize
the load. Refer to the SLC 500 Modular Hardware Style
Installation and Operation Manual, publication 1747-6.2, for
more information on transien t pul s es and gui deli nes to reduce
inadvertent processor operation.

Publication 1746-IN005A-US-P

Discrete I/O Modules 23

Table 15:Specifications for Output Modules 1746-OV8, -OV16, and -OVP16

Catalog Number 1746-

Specification

OV8 OV16

(1)

OVP16

(1)(2)(3)

(4)

Number of Outputs 81616
Points per Common 81616
Voltage Category 24V dc Signal Output

Operating Voltage (V dc) 10 to 50 (sink)
Backplane

5V dc 0.135A 0.270A 0.250A

20.4 to 26.4
(sink)

Current
Consumption

Signal Delay (max.). Resistive
Load.

Off State Leakage (max.)

24V dc 0.0A

on = 0.1 ms
off = 1.0 ms

(6)

1 mA

on = 0.1 ms

off = 1.0 ms

(5)

Load Current (min.) 1 mA

0.50A at
30°C

0.25A at
60°C

1.5A at 30°C

1.0A at 60°C

(8)

Continuous Current per Point

1.0A at 30°C

(7)

0.50A at
60°C

Continuous Current per Module

8.0A at 30°C

4.0A at 60°C

6.4A at

0 to 60°C

On State Voltage Drop (max.) 1.2V at 1.0A 1.2V at 0.5A 1.0V at 1.0A

Surge Current per Point

(1)Removable Terminal Block.
(2)A fused common and blown fuse LED are provided on this module. See “Fuse Protection

and Blown Fuse Diagnostics” on page 32.

(3)Use the following ID Code when configuring your system with programming software or

the HHT: 1746-OVP16 = 2922.
(4)Certified for Class 1, Division 2 hazardous location by CSA.
(5)Fa st turn-off modules (1746-OB6EI, -OBP8 Series B and later, -OB16E Series B and

later, -OBP16, and -OVP16) provide fast OFF delay for inductive loads. Comparative

OFF delay times for 1746-OB8/-OV8 and fast turn-off modules; when switching Bulletin

100-B110 (24Ws sealed) contactor, are: 1746-OB8/-OV8 OFF delay = 152 ms; fast turn-

off modules OFF delay = 47 ms.

(9)

3.0A for 10 ms

4.0A for 10

(10)

ms

Publication 1746-IN005A-US-P

24 Dis cre te I/ O Mod ule s

(6)To limit the effects of leakage current through solid state outputs, a loading resistor can

be connected in parallel with your load. For transistor outputs, 24V dc operation, use a

5.6K Ω, 1/2W resistor.

(7)Recommended surge suppression: For transistor outputs when switching 24V dc

inductive loads, use a 1N4004 diode reverse-wired across the load (also see footnote 9).

Refer to the

publication 1747-6.2, for more information on surge suppression.
(8)Fa st off delay for inductive loads is accomplished with surge suppressors on the 1746-

OB6EI, -OBP8 Series B and later, -OB16E Series B and later, -OBP16, and -OVP16

modules. A suppressor at the load is not needed unless another contact is connected in

series. If this is the case, a 1N4004 diode should be reverse wired across the load. This

defeats the fast turn-off feature.
(9)Repeatability is once every 1s at 30°C. Repeatability is once every 2s at 60°C.

(10)Surge current = 32A per module for 10 ms.

SLC 500 Modular Hardware Style Installation and Operation Manual

,

ATTENTION: A transient pulse occurs in transistor outputs
when the external dc supply voltage is applied to the output
common terminals (e.g., via the master control relay). This can

!

occur regardless of the processor having power or not. For most
applications, the energy of this pulse is not sufficient to energize
the load. Refer to the SLC 500 Modular Hardware Style
Installation and Operation Manual, publication 1747-6.2, for
more information on transien t pul s es and gui deli nes to reduce
inadvertent processor operation.

Publication 1746-IN005A-US-P

Discrete I/O Modules 25

Table 16:Specifications for Output Module 1746-OG16

Specification 1746-OG16

Number of Outputs 16
Points per Common 16
Voltage Category 5V dc TTL Signal Input (sinking)

Operating Voltage

Backplane Current
Consumption

Signal Delay (max.). Resistive
Load.

Off State Leakage (max.) 0.1 mA
Load Current (min.) 0.15 mA
Continuous Current per Point 24 mA

(1)Removable Terminal Block.

5V dc 0.180A
24V dc 0.0A

50mV peak to peak ripple (max.)

4.5 to 5.5V dc

on = 0.25 mA
off = 0.50 mA

(1)

(2)

(2)TTL outputs are inverted (0 to 0.4V dc = low voltage = True = ON). Use a NOT instruction

in your ladder program to convert to traditional True = High logic.

ATTENTION: To avoid potential damage to TTL modules,
handle them by the ends of the module, not metallic surfaces.
Electrostatic discharges can damage the module. Care should be

!

taken to prevent exposure of terminals or components to
electrostatic charges.

Careful wire routing within the enclosure helps cut down electrical noise between
I/O lines. Refer to the SLC 500 Modular Hardware Style Installation and
Operation Manual, publication 1747-6.2, for recommended wiring pro cedures
for TTL modules.

Cable Length - Limit cable length to 3 meters (10 feet) per point for ou tputs in
standard enviro nments. R efer to Al len-B radley Programmabl e Controller Wiring
and Grounding Guidelines, publication 1770-4.1, for complete information.

Publication 1746-IN005A-US-P

26 Dis cre te I/ O Mod ule s

Relay Contact Output Modules

Table 17:Specifications for Output Modules 1746-OW4, -OW8, -OW16, and ­OX8

Catalog Number 1746-

Specification

Number of Outputs 48168

OW4

(1)

OW8

(1)

OW16

(1)(2)

OX8

(1)(2)

Points per Common 448

Individually

Isolated

Voltage Category ac/dc Relay

5V dc 5 to 125

Operating
Voltage

Backplane
Current
Consumption

Signal Delay (max.) .
Resistive Load.

Off State Leakage
(max.)

24V
ac

5 to 265

5V dc 0.045A 0.085A 0.170A 0.085A
24V

dc

0.045A 0.090A 0.180A 0.090A
on = 10.0 ms

off = 10.0 ms

0 mA

Load Current (min.) 10mA at 5V dc
Continuous Current

per Point

(3)

See relay contact ratings. (Table 18 and Table 19 on

page 27)

Continuous Current
per Module

(1)Certified for Class 1, Division 2 hazardous location by CSA.
(2)Removable Terminal Block.
(3)Recommended surge suppression: For relay contact outputs, refer to the

Installation and Operation Manual

across your external inductive load will extend the life of SLC 500 relay contacts.

(4)The continuous current per module must be limited so the module power does not

exceed 1440 VA.

Publication 1746-IN005A-US-P

8.0A ac

8.0A /

Common

, publication 1747-6.2. Connecting surge suppressors

16.0A ac

8.0A /

Common

16.0A ac

8.0A /

Common

(4)

SLC 500

Discrete I/O Modules 27

Relay Contact Rati ngs

Table 18:Relay Contact Rating Table for Output Modules 1746-OW4, -OW8,
and -OW16

Voltages:

Amperes

Make Break Make Break

(1)

Amperes

Continuous

(2)

V olt-Amperes

120 15 1.5

Maximum Volt s (ac )

2.5 1800 180

240 7.5 0.75

Maximum Volts
(dc)

125
24

0.22

1.2

(3)

(3)

1.0 28

2.0 28

Table 19:Relay Contact Rating Table for Output Module 1746-OX8

(3)

(3)

(1)

Amperes

Continuous

(2)

Volt-Amperes

5.0 3600 360

1.0 28

2.0 28

Voltages:

Maximum Volts
(ac)

Maximum Volts
(dc)

Amperes

Make Break Make Break

120 30 3.0
240 15 1.5
125
24

0.22

1.2

(1)Recommended surge suppression: For relay contact outputs, refer to the

Installation and Operation Manual

across your external inductive load will extend the life of SLC 500 relay contacts.

(2)The continuous current per module must be limited so the module power does not

exceed 1440 VA.

(3)For dc voltage applications, the make/break ampere rating for relay contacts can be

determined by dividing 28 VA by the applied dc voltage. For example, 28 VA/48V dc =

0.58A. For dc voltage applications less than 14V, the make/break ratings for relay
contacts cannot exceed 2A.

, publication 1747-6.2. Connecting surge suppresors

SLC 500

Publication 1746-IN005A-US-P

28 Dis cre te I/ O Mod ule s

Input/Output Combination Modules

Table 20:Specifications for Combination Modules 1746-IO4, -IO8, -IO12, and

-IO12DC
Catalog Numbe r 1746-

Specification

IO4

(1)(2)

IO8

(1)(2)

IO12

(1)(3)

(4)

IO12DC

(7)

(3)(5)(6)

Points per Module

2 inputs

2 outputs

4 inputs

4 outputs

6 inputs

6 outputs

6 inputs

6 outputs

Points per Common 246 6
Voltage Category

(Inputs)
Operating Voltage

(Inputs)
Voltage Category

(Outputs)
Operating Voltage

(Outputs)
Backplane

5V dc 0.030A 0.060A 0.090A 0.080

120V ac 24V dc

85 to 132V ac 10 to 30V dc

100/120V ac Relay contact output

5 to 265V ac
5 to 125V dc

Current
Consumption

(1)Certified for Class 1, Division 2 hazardous location by CSA.
(2)See specifications for catalog numbers 1746-IA4 and 1746-OW4. Continuous Current per

1746-IO4 Module is 4.0A. Continuous Current per 1746-IO8 Module is 8.0A.

(3)Removable Terminal Block.

24V dc 0.025A 0.045A 0.070A 0.060

(4)See specifications for catalog numbers 1746-IA16 and 1746-OW16. Continuous Current

per 1746-IO12 Module is 8.0A.

(5)See specification for catalog numbers 1746-IB16 and 1746-OW16. Continuous Current

per 1746-IO12DC Module is 8.0A.
(6)Certified for Class 1, Division 2 hazardous location by C-UL.
(7)Use the following ID Code when configuring your system with programming software or

the HHT: 1746-IO12DC = 1512.

Publication 1746-IN005A-US-P

Discrete I/O Modules 29

Note:

Combination I/O modules (Catalog Numbers 1746-IO4, 1746-IO8, 1746-IO12 and
1746-IO12DC:

For the first sev era l se conds of any powerup or when power is applied to a rack that is
not under processo r cont rol , the output LEDs of the combination IO modules in the ra ck
will be illuminated.

Racks are not und er processor control if on e of t he following conditi ons exist:

Modular Hardware Style (only):

Processor is absent from the rack or the rack interconnect cable is not properly
connected.

Modular Hardware Style and Fixed Hardware Style:

The processor does not have the firmware PROM installed or the pro cessor is not
functioning properly.

Publication 1746-IN005A-US-P

30 Dis cre te I/ O Mod ule s

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 is included with the I/O modules and can also be obtained through your
Allen-Bradley distributor.

ATTENTION: Do not touch or remo ve th e terminal block when
the SLC 500 system is powered. Contact with ac line potential

!

Applying 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.

may cause injury to pe rs onnel.

3. Apply the octal label to the filter.

4. Press firmly to ensure proper adhesion of the label.

Applying the Octal Door Label

1. Remove the octal door lab e l from its paper carrier.

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

3. Press firmly to ensure proper adhesion of the label.

Publication 1746-IN005A-US-P

Discrete I/O Modules 31

Removable Terminal Blocks

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

Figure 1:Installing Octal Labels

Module Color Bar

Beveled Edge

Removable
Terminal
Block

Termi nal Wiring
max. #14 AWG (2mm
max. 2 wires per terminal
max. torque: 0.9Nm (8 in-lbs)

2

)

Octal Filter Label

Upper Retaining Screw Maximum
Torque = 0.6 Nm (5.3 in-lbs)

1746-XXXX 1746-XXXX(OCTAL)

Octal Door Label

Lower Retaining Screw Maximum
Torque = 0.6 Nm (5.3 in-lbs)

OCTAL

Publication 1746-IN005A-US-P

32 Dis cre te I/ O Mod ule s

Fuse Protection and Blown Fuse Diagnostics

This section describes fusing characteristics for the following modules:

• Catalog 1746-OBP16

• Catalog 1746-OVP16

• Catalog 1746-OAP12

Fuse Protection (1746-OBP16 and 1746-OVP16)

The fuse on the 1746-OBP1 6 and 1746 -OVP16 mod ules (s hown on pag e 33) has
been desig ned to provide short-circuit protection for wiring only (16 AWG or
larger) 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 and the
module should be replaced or a spare output channel used for the load. 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 blo w 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 pro perly sized
to match your individual load characteristics.

Fuse Protection (1746-OAP12)

A fuse is provided on each common of the 1746-OAP12 module (shown on
page 34) for a total of 2 fuses. The fuses are designed to protect the mod ule fro m
short-circuit conditions. The fuse do e s not provide overload protectio n. 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 pro t ection for yo ur applicatio n, user-supplied fuses should be installed
externally. 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 2.0A.

Blown Fuse Diagnostics

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

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

2. A processor error will occur if JP1 connects pins 2 and 3. (See figures on
page 33 and page 34.)

Publication 1746-IN005A-US-P

Discrete I/O Modules 33

Figure 2:Location of Jumpers and Fuses for 1746-OBP16 and -OVP16

Location for 1746-OBP16 Fuse (F1)

JP 1

3
2
1

OUTPUT

Jumper for processor
notification (JP1)

Location for 1746-OVP16 Fuse (F1)

F
U
S
E

Blown Fuse LED

Left Side View

WHEN FUSE OPENS

JP1

23

REPLACEMENT FUSE:
LITTELFUS E 322010
A-B CAT. NO. 1746-F8

Jumper Settings and

Fuse Replacement

Information

12

PROCESSOR
CONTINUES

PROCESSOR
FAULTS

Front View

Publication 1746-IN005A-US-P

34 Dis cre te I/ O Mod ule s

Figure 3:Location of Jumpers and Fuses for 1746-OAP12

F1

23
1

JP1

Left Side View

Jumper for processor
notification (JP1)

OUTPUT

Front View

F2

WHEN FUSE OPENS

1

2

F
U
S
E

Blown Fuse LED

JP1

23

PROCESSOR
CONTINUES

PROCESSOR
FAULTS

REPLACEMENT FUSE:
SAN-O HQ 6.3A
A-B CAT. NO. 1746-F9

Jumper Settings and

Fuse Replacement

Information

Publication 1746-IN005A-US-P

Discrete I/O Modules 35

Processor Operation in Case of Blown Fuse - Processor
Continues

The factory set position for JP1 is shown in Figure 4. For this JP1 configuration,
the processor operation will continue if the module fuse blow s.

Figure 4:JP1 Factory Set Position (No Processor Notification)

JP1

3

2

1

1746-OBP16 and -OVP16

2

3

1746-OAP12

1

JP1

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

Processor Operation in Case of Blown Fuse - Processor
Faults

The Processor Fault pos i tio n for JP 1 is sh own i n Figure 5 on t he foll o win g page.
For this JP1 confi guration, the processor ge nerates a non- recoverable erro r for all
SLC 500 processors. For a non-recoverable error, note the following:

• Processor operation halts and the processor fault light flashes.

• All outputs are reset to OFF.

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

• Monitor processor status file word S:6 for er ror code x x58 for SLC 500 and
5/01™ processors, and error code xx60 for SLC 5/02™ and higher
processors.

Publication 1746-IN005A-US-P

36 Dis cre te I/ O Mod ule s

s

Figure 5:JP1 in Processor Fault Notification Position

JP1

3

2

1

1746-OBP16 and -

1

2

3

JP1 is in processor Fault Position
Processor is notified when fuse i
blown.

1746-

JP1

IMPORTANT: When using SLC 5/02 and higher processors, a User Fault Routine

cannot be used to clear the major fault bit.

ATTENTION: For 1746-OBP16/-OVP16, all outputs on the
module are OFF if the fuse blows. For 1746-OAP12, 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 ensure the safety of personnel and guard
against equipment damage.

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

• Your pro gramm ing device’s reference manual

• HHT User Manual, publication 1747-NP002:
Chapter 28, Troubleshooting Faults

Chapter 29, Understanding the Fault Routine

Table 21 defines operation of all SLC 500 processors in the case of a blown fuse
in a 1746-OBP16, -OVP16 and -OAP12:

T able 21:Processor Operation After A Bl own Fuse (174 6-OBP16, -OVP16 an d

-OAP12)

JP1 Set to

Processor Continues

Publication 1746-IN005A-US-P

JP1 Set to

Processor Faults

Discrete I/O Modules 37

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

Non-recoverable error.
Processor operat ions stops and
all outputs reset to OFF.

Publication 1746-IN005A-US-P

38 Dis cre te I/ O Mod ule s

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 39.

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

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

4. Return processor to Run Mode.

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

• Your pro gramm ing 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/-OVP16 -Littelfuse #32201 0,10A. This fuse is required to
maintain UL/CSA rating. Replacement Fuse Kit is catalog number
1746-F8. (5 fuses per kit).

• 1746-OAP12 -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 (5 fuses per kit).

Publication 1746-IN005A-US-P

Discrete I/O Modules 39

Fuse Replacement Procedure

To replace a blown fuse:

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/-OVP16: Use a wide tipped, slotted head screw driver to

remove the blown fuse. Slide the screw driver 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: A fuse holder is provided with each fuse. Simply g rasp the

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

4. Replace the fuse.

• 1746-OBP16/OVP 16: Center th e

press down. If a tool is used to press the fuse in place, apply pressure to
the metal end caps only, not the center of the fuse.

• 1746-OAP12: Inser t a new fuse into the fuse holde r , ali gn fuse hold er on

fuse clips and press down.

5. Replace the output module in the chassis.

6. Restore SLC 500 system power. Clear processor fault bits as indicated in
the steps provided on page 38.

replacement fuse over the fuse clip an d

Publication 1746-IN005A-US-P

40 Dis cre te I/ O Mod ule s

Electronically Protected Modules (1746-OB6EI and ­OB16E)

Electronic Protection

The electronic protection of the 1746-OB6EI and -OB16E has 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 con dition on an output channel , that channel
will limit current within milliseconds after it s thermal cut-out temperature has
been reached. All other channels continue to operate as directed by the CPU
(processor) mo dule.

IMPORT ANT : The modules do not provide protection against reverse polarity

wiring or wiring to AC power sources . Electroni c protect ion is not
intended to replace fuses, circuit breakers, or other code-required
wiring protection devices.

Front View

OUTPUT

OUTPUT

E

E

F

F

U

U

S

S

E

E

EFUSE LED

Note: There is no jumper

setting on this module

Publication 1746-IN005A-US-P

Discrete I/O Modules 41

Auto Reset Operation

IMPORTANT : The 1746-OB6EI and -OB16E perform auto-reset under overload

conditions. When an output channel overload occurs as described
on page 40, 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 cut­out 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.

Short Circuit/Overload Current Diagnostics

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

1. The E-Fuse LED will illuminate provided that power is applied to the
module. Power required: 5V dc via backplane and load power via an
external supply.

2. 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.

Publication 1746-IN005A-US-P

42 Dis cre te I/ O Mod ule s

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 wi ring diagrams includ e 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. An
octal label kit should be included with your 16-point I/O modules, or a separate
octal conversion kit can be ordered, to allow you to convert your module to the
octal system.

IMPORTANT : Ensure the octal labels are used with your PLC system. Directions

on how to install the labels are included with the kit and on
page 30 of this document.

Figure 6:Decimal and Octal Labeling for 16-Point I/O Modules

1746-IA16

L1

For SLC (decimal)

IN 14

100/120V ac

16

For PLC (octal)

L2

100/120V ac

IN 0

IN 2

IN 4

IN 6

IN 8

IN 10

IN 14

AC COM

COMMONS
CONNECTED
INTERNALLY

IN 12

0

2

4

6

10

12

14

16

IN 1

IN 3

IN 5

5

IN 7

IN 9

11

IN 11

13

IN 13

15

IN 15

17

AC COM

1

3

7

SLC

PLC

Publication 1746-IN005A-US-P

Discrete I/O Modules 43

Input Modules - ac

Figure 7:Wiring Diagrams (1746-IA4, -IA8, -IA16)

L1

100/120V ac

L2

1746-IA4

100/120V ac

NOT
USED

NOT
USED

NOT
USED

NOT
USED

IN 0

IN 1

IN 2

IN 3

AC COM

1746-IA16

100/120V ac

L1

100/120V ac

L2

1746-IA8

100/120V ac

COMMONS
CONNECTED
INTERNALLY

IN 0

IN 1

IN 2

IN 3

IN 4

IN 5

IN 6

IN 7

AC COM

AC COM

L1

100/120V ac

L2

IN 0

IN 2

IN 4

IN 6

IN 8

IN 10

IN 12

IN 14

AC COM

COMMONS
CONNECTED
INTERNALLY

0

2

4

6

10

12

14

16

IN 1

1

IN 3

3

IN 5

5

IN 7

7

IN 9

11

IN 11

13

IN 13

15

IN 15

17

AC COM

SLC

PLC

Publication 1746-IN005A-US-P

44 Dis cre te I/ O Mod ule s

Figure 8:Wiring Diagrams (1746-IM4, -IM8, -IM16)

L1

200/240V ac

L2

1746IM4

200/240V ac

NOT
USED

NOT
USED

NOT
USED

NOT
USED

IN 0

IN 1

IN 2

IN 3

AC COM

1746-IM16

200/240V ac

L1

200/240V ac

L2

1746-IM8

200/240V ac

COMMONS
CONNECTED
INTERNALLY

IN 0

IN 1

IN 2

IN 3

IN 4

IN 5

IN 6

IN 7

AC COM

AC COM

L1

200/240V ac

L2

IN 0

IN 2

IN 4

IN 6

IN 8

IN 10

IN 12

IN 14

AC COM

COMMONS
CONNECTED
INTERNALLY

10

12

14

16

0

2

4

6

IN 1

IN 3

IN 5

IN 7

IN 9

11

IN 11

13

IN 13

15

IN 15

17

AC COM

1

3

5

7

SLC

PLC

Publication 1746-IN005A-US-P

Input Modules - dc

Figure 9:Wiring Diagram (1746-IN16)

1746-IN1 6

24V ac/dc SINKING

L1 or +DC

IN 0

IN 1

0

10

12

14

16

2

4

6

IN 3

IN 5

IN 7

IN 9

IN 11

IN 13

IN 15

AC/DC
COM

1

3

5

7

11

13

15

17

V ac/dc

L2 or -DC

IN 2

IN 4

IN 6
IN 8

IN 10

IN 12

IN 14

AC/DC
COM

COMMONS
CONNECTED
INTERNALLY

Discrete I/O Modules 45

SLC

PLC

Figure 10:Wiring Diagram (1746-IB8, -IB16, -ITB16, -IC16, -IH16)

+DC

24V dc

±DC

1746-IB8

24V dc SINKING

COMMONS
CONNECTED

IN 0
IN 1

IN 2

IN 3

IN 4

IN 5

IN 6
IN 7

DC COM

DC COM

1746-IB16, -ITB 16

24V dc SINKING

+DC

24V dc

(IB16, ITB16)

48V dc

(IC16)

125V dc

(IH16)

±DC

COMMONS
CONNECTED

1746-IC16

48V dc SINKING

IN 0

IN 1

0

2
4

6

6

10

12
14

16

DC COM

IN 3

IN 5

IN 7

IN 9

IN 11
IN 13

IN 15

11

13

15

17

1

3
5
7

IN 2
IN 4

IN 6

IN 8

IN 10

IN 12
IN 14

DC
COM

125V dc SINKING

1746-IH16

SLC

PLC

Publication 1746-IN005A-US-P

46 Dis cre te I/ O Mod ule s

Figure 11:Wiring Diagram (1746-IV8, -IV16, -ITV16)

1746-IV8

24V dc SOURCING

±DC

VDC

VDC

IN 0
IN 1

IN 2

IN 3

IN 4

IN 5
IN 6

IN 7

24V dc

+DC

±DC

24V dc

+DC

VDC CONNECTED
INTERNALLY

Figure 12:Wiring Diagram (1746-IG16)

1746-IV16, -ITV16

24V dc SOURCING

IN 0

0

IN 2

2

IN 4

4

IN 6

6

IN 8

10

IN 10

12

IN 12

14

IN 14

16

VDC

VDC CONNECTED
INTERNALLY

IN 1

IN 3

IN 5

IN 7
IN 9

IN 11

IN 13
IN 15

VDC

11

13

15
17

1

3

5

7

SLC

PLC

+DC

+5V dc

±DC

1746-IG16

TTL INPUT (Low = True)

+5 DC

IN 0

1

3

5

7

11

13

15

17

0

IN 2

2

IN 4

4

IN 6

6

IN 8

10

IN 10

12

IN 12

14

IN 14

16

DC COM

IN 1

IN 3

IN 5

IN 7

IN 9

IN 11

IN 13

IN 15

SLC

PLC

Publication 1746-IN005A-US-P

Output Modules - ac

Figure 13:Wiring Diagrams (1746-OA8, -OA16)

1746-OA8

100 to 240V ac TRIAC OUTPUT

Discrete I/O Modules 47

VAC 1

OUT 0

OUT 1

OUT 2

OUT 3

VAC 2

OUT 4

OUT 5

OUT 6

OUT 7

L1

100-240V ac

L2

SLC

PLC

L1

100-240V ac

CR

CR

L2
L1

100-240V ac

CR

CR

L2

1746-OA16

100 to 240V ac TRIAC OUTPUT

VAC 1

OUT0

1

3

5

7

OUT 10

OUT 14

OUT 2

OUT 4

OUT 6

VAC 2

OUT 8

OUT 12

0

2

CR

4

CR

6

10

12

14

16

CR

CR

CR

CR

CR

CR

OUT 1

OUT 3

OUT 5

OUT 7

OUT 9

OUT 11

OUT 13

OUT 15

11

13

15

17

L1

100-240V ac

L2

Publication 1746-IN005A-US-P

48 Dis cre te I/ O Mod ule s

Figure 14:Wiring Diagram (1746-OAP12)

1746-OAP12

100 to 240V ac HIGH CURRENT TRIAC OUTPUT

L1

100-240V ac

CR

CR

VAC 1

OUT 1

OUT 3

OUT 5

NOT
USED

L2

OUT 7

CR

CR

SLC

PLC

OUT 9

OUT 11

VAC 2

Output Modules - dc

VAC 1

1

OUT 0

3

OUT 2

5

OUT 4

NOT
USED

7

OUT 6

11

OUT 8

10

13

OUT 10

12

VAC 2

COMMONS
CONNECTED
INTERNALLY

COMMONS
CONNECTED
INTERNALLY

0

2

CR

4

L2

6

CR

100-240V ac

L1

Figure 15:Wiring Diagrams (1746-OB6EI)

1746-OB6EI

10-30V dc TRANSISTOR OUTPUT-SOURCING

CHANNEL-TO-CHANNEL ISOLATED

+DC

10-30V dc

-DC

+DC

10-30V dc

-DC

+DC

10-30V dc

-DC

CR

CR

CR

VDC 1

OUT 1
DC

COM 1
VDC 3

OUT 3
DC

COM 3
VDC 5

OUT 5
DC

COM 5

VDC 0

OUT 0
DC

COM 0
VDC 2

OUT 2
DC

COM 2
VDC 4

OUT 4
DC

COM 4

+DC

10-30V dc

-DC

+DC

10-30V dc

-DC

+DC

10-30V dc

-DC

Publication 1746-IN005A-US-P

Discrete I/O Modules 49

Figure 16:Wiring Diagrams (1746-OB8, -OBP8, -OB16, -OB16E, -OBP16)

1746-OB8

10 to 50V dc Transistor Output-Sourcing

VDC

OUT 0

OUT 1

OUT 2

OUT 3

OUT 4

OUT 5

OUT 6

OUT 7

DC
COM

CR

CR

CR

CR

+DC

10-50V dc

-DC

1746-OB16, 1746-OB16E, -OBP16

10 to 50V dc, 10 to 30V dc, 20.4 to 26.4V dc

Transistor Output-Sourcing

1746-OBP8

20.4 to 26.4V dc Transistor Output-Sourcing

+DC

+DC

20.4-26.4V dc

CR

CR

VDC1

OUT 1

OUT 3

NC

NC

OUT 0

OUT 2
DC

COM1
NC

-DC

NC

NC

NC

CR

CR

VDC2

OUT 5

OUT 7

OUT 4

OUT 6
DC

COM2

+DC

20.4-26.4V dc

-DC

SLC

PLC

+DC

10-50V dc (OB16)

10-30V dc (OB16E)

20.4-26.4V dc (OBP16)

-DC

CR

CR

CR

CR

VDC

OUT 1

OUT 3

OUT 5

OUT 7

OUT 9

OUT 11

OUT 13

OUT 15

OUT 0

0

OUT 2

1

3

5

7

11

13

15

17

OUT 4

OUT 6

OUT 8

OUT 10

OUT 12

OUT 14

DC COM

12

14

16

2

4

6

10

CR

CR

CR

CR

Publication 1746-IN005A-US-P

50 Dis cre te I/ O Mod ule s

Figure 1 7:Wiring Diagrams (1746-OV8, -OV16, -OVP16)

1746-OV8

10 to 50V dc TRANSISTOR

OUTPUT SINKING

VDC

OUT 0

OUT 1

OUT 2

OUT 3

OUT 4

OUT 5

OUT 6

OUT 7

DC COM

CR

CR

CR

CR

10 to 50V dc OR 20.4 to 26.4V dc TRANSISTOR

+DC

10-50V dc (OV16)

20.4-26.5V dc (OVP16)

-DC

+DC

10-50V dc

-DC

1746-OV16, -OVP16

OUTPUT SINKING

VDC

13

15

17

1

3

5

7

11

OUT 0

OUT 2

OUT 4

OUT 6

OUT 8

OUT 10

OUT 12

OUT 14

CR

CR

CR

CR

OUT 1

OUT 3

OUT 5

OUT 7

OUT 9

OUT 11

OUT 13

OUT 15

0

2

10

12

14

16

DC COM

4
6

CR

CR

CR

CR

SLC

PLC

Publication 1746-IN005A-US-P

Figure 18:Wiring Diagrams (1746 -OG16)

1746-OG16

TTL OUTPUT (Low = True)

+DC

+5V dc

-DC

VDC

17

1

3

5

7

11

13

15

OUT 0

OUT 2

OUT 4

OUT 6

OUT 8

OUT 10

OUT 12

OUT 14

DC COM

L

L

L

L

L

L

L

L

OUT 1

OUT 3

OUT 5

OUT 7

OUT 9

OUT 11

OUT 13

OUT 15

14
16

L

0

L

2

L

4

L

6

L

10

L

12

L

L

Discrete I/O Modules 51

SLC

PLC

Publication 1746-IN005A-US-P

50 Dis cre te I/ O Mod ule s

Figure 1 7:Wiring Diagrams (1746-OV8, -OV16, -OVP16)

Relay Contact Output Modules

Figure 19:Wiring Diagrams (1746 -OW4, -OW8, -OW16)

1746-OV8

10 to 50V dc TRANSISTOR

OUTPUT SINKING

VDC

OUT 0

VAC-VDC

OUT 1

OUT 0

OUT 2

OUT 1

OUT 3

OUT 2

OUT 4

OUT 3

OUT 5

NOT
USED

OUT 6

NOT
USED

OUT 7

NOT
USED

DC COM

NOT
USED

OUT 7

NOT
USED

1746-OW4

RELAY OUTPUT

CR

CR

CR

CR

CR

CR

L1 or +DC

V ac/dc

10-50V dc

L2 or -DC

+DC

-DC

VAC-VDC

1

OUT 0

OUT 1

OUT 2

OUT 3

VAC-VDC

2

OUT 4

OUT 5

OUT 6

OUT 7

1746-OW8

RELAY OUTPUT

CR

CR

CR

CR

1746-OV16, -OVP16

10 to 50V dc OR 20.4 to 26.4V dc TRANSISTOR

+DC

L1 or +DC

V ac/dc

10-50V dc (OV16)

20.4-26.5V dc (OVP16)

CR

CR

L2 or -DC

CR

-DC

SLC

PLC

CR

1746-OW16

OUTPUT SINKING

RELAY OUTPUT

VAC-VDC

OUT0

VDC

CR

CR

CR

CR

1

OUT 1

OUT 3

OUT 5

OUT 7

OUT 9

OUT 11
OUT 13

OUT 15

OUT 1

1

OUT 3

3

OUT 5

5

OUT 7

7

OUT 9

OUT 11

11

OUT 13

13

OUT 15

15

17

0

OUT 2

2

OUT 4

4

OUT 6

6

VAC-VDC

2

OUT 8

13

10

OUT 10

15
12

OUT 12

17
14

OUT 14

16

1

3

5

7

11

OUT 0

OUT 2

OUT 4

OUT 6

OUT 8

OUT 10

OUT 12

OUT 14

CR

DC COM

CR

CR

CR

0

2

10

12

14

16

4
6

CR

L1 or +DC

CR

CR

V ac/dc

CR

SLC

PLC

L2 or -DC

L1 or +DC

V ac/dc

L2 or -DC

L1 or +DC

V ac/dc

L2 or -DC

Publication 1746-IN005A-US-P - January 2000 40071-079-
01(A)

Supersedes Publication 1746-5.3 - March 

Publication 1746-IN005A-US-P

2000 Rockwell International. All Rights Reserved.

´H'*o!¶A"¨

Figure 20:Wiring Diagram (1746-OX8)

1746-OX8

CHANNEL-TO-CHANEL ISOLATED RELAY

Discrete I/O Modules 53

VS0 L1

VS1 L1

VS2 VDC

VS3 VDC

VS4 L1

VS5 L1

VS6 VDC

VS7 VDC

VAC-VDC

0

VAC-VDC

1

VAC-VDC

2

VAC±VDC

3

NOT USED

VAC-VDC

4

VAC-VDC

5

VAC-VDC

6

VAC-VDC

7

OUT 0

OUT 1

OUT 2

OUT 3

NOT
USED

OUT 4

OUT 5

OUT 6

OUT 7

CR

CR

CR

CR

VS0 L2

VS1 L2

VS2 DC COM

VS3 DC COM

VS4 L2

VS5 L2

VS6 DC COM

VS7 DC COM

Publication 1746-IN005A-US-P

54 Dis cre te I/ O Mod ule s

Input/Output Combination Modules

Figure 21:Wiring Diagram (1746-IO4, -IO8)

1746-IO4

100/120V ac INPUT - RELAY

L1

100/120V ac

L2

L1

VAC-VDC

OUT 0

OUT 1
NOT

USED
NOT

USED

IN 0

IN 1
NOT

USED
NOT

USED

OUT 7
AC COM

CR

1746-IO8

100/120V ac INPUT - RELA Y

VAC-VDC

OUT 0

OUT 1

OUT 2

OUT 3

IN 0

CR

CR

L1 or +DC

V ac/dc

L2 or -DC

L1 or +DC

V ac/dc

L2 or -DC

100/120V ac

L2

AC COM

Publication 1746-IN005A-US-P

IN 1

IN 2

IN 3

OUT 7

Figure 22:Wiring Diagram (1746-IO12)

1746-IO12

100/120V ac INPUT - RELAY

Discrete I/O Modules 55

L1 or +DC

V ac/dc

CR

VAC-VDC

OUT 1

OUT 3

OUT 5

OUT 0

OUT 2

OUT 4

NOT
USED

CR

L2 or -DC

L1

100/120V ac

L2

NOT
USED

IN 1

IN 3

IN 5

NOT
USED

IN 0

IN 2

IN 4

NOT
USED

AC COM

Figure 23:Wiring Diagram (1746-IO12DC)

1746-IO12DC

24V dc INPUT - RELAY OUTPUT

L1 or +DC

V ac/dc

L2 or -DC

+DC

10-30V dc

-DC

CR

VAC-VDC

OUT 1

OUT 3

OUT 5

NOT
USED

IN 1

IN 3

IN 5

NOT
USED

OUT 0

OUT 2

OUT 4

NOT
USED

IN 0

IN 2

IN 4

NOT
USED

DC COM

CR

Publication 1746-IN005A-US-P

PLC is a registered trademark of Rockwell Automat ion.
SLC 500, SLC 5/01, SLC 5/02, SLC 5/03, SLC 5/04, and SLC 5/05 are trademarks of Rockwell Automation.

Publication 1746-IN005A-US-P - January 2000 40071-079­01(A)

Supersedes Publication 1746-5.3 - March 

2000 Rockwell International. All Rights Reserved.

´H'*o!¶A"¨