Allen-Bradley 1771-OBDS User manual

Publication 1771ĆIN033B-EN-P - July 2002

DC (10Ć40V) Current Limiting

Output Module

Cat. No. 1771ĆOBDS

Use this document as a guide when installing the catalog number

1771-OBDS output module.

For information on: See page

Important User Information 1

Preinstallation onsiderations 4

alculate Power Requirements 4

Set the Fault Mode Selection Jumper 4

Key the Backplane onnector 5

Install the Module and Field Wiring Arm 6

onnect Wiring to the Output Module 7

Short ircuit Protection 10

Replacing the Fuse 11

For this reference information See page

Intepreting the Status Indicators 10

Hazardous Location Approval 12

Specifications 13

Because of the variety of uses for the products described in this

publication, those responsible for the application and use of these

products 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. In no event will Rockwell Automation be

responsible or liable for indirect or consequential damage resulting

from the use or application of these products.

Any illustrations, charts, sample programs, and layout examples

shown in this publication are intended solely for purposes of

example. Since there are many variables and requirements associated

with any particular installation, Rockwell Automation does not

assume responsibility or liability (to include intellectual property

liability) for actual use based upon the examples shown in this

publication.

Important User Information

Installation Instructions

To The Insta er

DC (10-40V) Current Limiting Output Module2

Publication 1771ĆIN033B-EN-P - July 2002

Allen–Bradley publication SGI–1.1, Safety Guidelines for

Application, Installation, and Maintenance of Solid–State Control

(available from your local Rockwell Automation office), describes

some important differences between solid–state equipment and

electromechanical devices that should be taken into consideration

when applying products such as those described in this publication.

Reproduction of the contents of this copyrighted publication, in

whole or part, without written permission of Rockwell Automation,

is prohibited.

Throughout this publication, notes may be used to make you aware

of safety considerations. The following annotations and their

accompanying statements help you to identify a potential hazard,

avoid a potential hazard, and recognize the consequences of a

potential hazard.

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 may lead to personal injury or

death, property damage, or economic loss.

IMPORTAN

Identifies information that is critical for

successful application and understanding of the

product.

DC (10-40V) Current Limiting Output Module 3

Publication 1771ĆIN033B-EN-P - July 2002

ATTENTION

Environment and Enc osure

This equipment is intended for use in a Pollution

Degree 2 industrial environment, in overvoltage

Category II applications (as defined in IEC

publication 60664–1), at altitudes up to 2000

meters without derating.

This equipment is considered Group 1, Class A

industrial equipment according to IEC/CISPR

Publication 11. Without appropriate precautions,

there may be potential difficulties ensuring

electromagnetic compatibility in other

environments due to conducted as well as radiated

disturbance.

This equipment is supplied as “open type”

equipment. It must be mounted within an

enclosure that is suitably designed for those

specific environmental conditions that will be

present, and appropriately designed to prevent

personal injury resulting from accessibility to live

parts. The 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.

See NEMA Standards publication 250 and IEC

publication 60529, as applicable, for explanations

of the degrees of protection provided by different

types of enclosures. Also, see the appropriate

sections in this publication, as well as the

Allen–Bradley publication 1770–4.1, (“Industrial

Automation Wiring and Grounding Guidelines”),

for additional installation requirements pertaining

to this equipment.

DC (10-40V) Current Limiting Output Module4

Publication 1771ĆIN033B-EN-P - July 2002

ATTENTION Preventing E ectrostatic Discharge

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.

•If available, use a static–safe workstation.

•When not in use, keep modules in appropriate

static–safe packaging.

This module must be used with a 1771-A1B thru -A4B or later I/O

chassis. Make sure no other output module or single card block

transfer module is placed in the same module group when using

2-slot addressing.

Your module receives its power through the 1771 I/O chassis

backplane from the chassis power supply. The module requires

300mA from the output of this supply. Add this to the requirements

of all other modules in the I/O chassis to prevent overloading the

chassis backplane and/or backplane power supply.

You may select one of two input-failure configurations (last state or

reset) by positioning a configuration plug on the bottom edge of the

printed circuit board. This configuration plug is independent of the

last state switch on the I/O chassis backplane.

To set the fault mode selection, proceed as follows:

1. Locate the fault mode selection plug at the bottom edge of the

module circuit board.

LS RESET

Fault Mode Selection Plug

Bottom edge of circuit board (shown in last state position) 10418ĆI

2. Using your finger, slide the plug off the two posts.

3. Carefully position the plug on two of the three posts that

correspond to your requirement.

PreĆinsta ation

Considerations

Ca cu ate Power

Requirements

Set the Fau t Mode

Se ection Jumper

DC (10-40V) Current Limiting Output Module 5

Publication 1771ĆIN033B-EN-P - July 2002

ATTENTION A module inserted into a wrong slot could be

damaged by improper voltages connected through

the wiring arm. Use keying bands to prevent

damage to the module.

Place your module in any slot in the chassis

except the leftmost slot, which is reserved for

processors or adapters.

Observe the following precautions

when inserting or removing keys:

•insert or remove keys with your

fingers

•make sure that key placement is

correct

Incorrect keying or the use of a tool

can result in damage to the

backplane connector and possible

system faults.

ATTENTION

Position the keying bands in the backplane connectors to correspond to

the key slots on the module.

You can change the position of these bands if

subsequent system design and rewiring makes

insertion of a different type of module necessary.

Upper onnector

11022ĆI

I/O chassis

Place the keying bands:

- between 10 and 12

- between 22 and 24

Key the Backp ane

Connector

DC (10-40V) Current Limiting Output Module6

Publication 1771ĆIN033B-EN-P - July 2002

WARNING When you insert or remove the module while

backplane power is on, or you connect or

disconnect the wiring arm with field power

applied, an electrical arc can occur. This could

cause an explosion in hazardous location

installations. Be sure power is removed or the area

is nonhazardous before proceeding.

ATTENTION Remove power from the 1771 I/O chassis

backplane and field wiring arm before removing

or installing an I/O module.

•Failure to remove power from the backplane or

wiring arm could cause module damage, degra-

dation of performance, or injury.

•Failure to remove power from the backplane

could cause injury or equipment damage due to

possible unexpected operation.

Swing the chassis locking bar down into place to secure

the modules. Make sure the locking pins engage.

1771ĆA1B, ĆA2B, ĆA3B, ĆA3B1, ĆA4B I/O chassis 1771ĆA1B, ĆA2B, ĆA3B1, ĆA4B Series B I/O chassis

locking tab

card guides

module

19809

card guides

locking bar

locking bar pin

Snap the chassis latch over

the top of the module to secure it.

17643

wiring arm

insta

remove

horizontal bar

Attach the wiring arm (1771ĆWH) to the horizontal

bar at the bottom of the I/O chassis.

The wiring arm pivots upward and connects with

the module so you can install or remove the

module without disconnecting the wires. 1771ĆWH

The 1771–OBDS module is a modular component of the 1771 I/O

system requiring a properly installed system chassis. Refer to

publication 1771–IN075 for detailed information on acceptable

chassis, proper installation and grounding requirements. Limit the

maximum adjacent slot power dissipation to 10W maximum.

Insta the Modu e and Fie d

Wiring Arm

DC (10-40V) Current Limiting Output Module 7

Publication 1771ĆIN033B-EN-P - July 2002

ATTENTION Remove power from the 1771 I/O chassis

backplane and field wiring arm before removing

or installing an I/O module.

•Failure to remove power from the backplane or

wiring arm could cause module damage,

degradation of performance, or injury.

•Failure to remove power from the backplane

could cause injury or equipment damage due to

possible unexpected operation.

Make wiring connections to the 21 terminal field wiring arm (cat. no.

1771-WH) shipped with the module.

Attach the wiring arm to the pivot bar on the bottom of the I/O

chassis. The wiring arm pivots upward and connects with the module

so you can install or remove the module without disconnecting the

wires.

WARNING When you insert or remove the module while

backplane power is on, or you connect or

disconnect the wiring arm with field power

applied, an electrical arc can occur. This could

cause an explosion in hazardous location

installations. Be sure power is removed or the area

is nonhazardous before proceeding.

Connect Wiring to the

Output Modu e

DC (10-40V) Current Limiting Output Module8

Publication 1771ĆIN033B-EN-P - July 2002

Actual wiring runs in this direction.

Output 00

Output 01

Output 02

Output 03

Output 04

Output 05

Output 06

Output 07

Output 10

Output 11

Output 12

Output 13

Output 14

Output 15

Output 16

Output 17

Output

Device

dc User

Supply

+dc

Ćdc

+dc

ĆĆ

10419ĆI

You must supply dc at terminals A through D on the wiring arm. You

need four dc connections to accommodate the total required surge

rating on the module without overstressing any single connection on

the field wiring arm. Jumper all dc connections together to prevent

module damage. Connect terminal E to dc common.

ATTENTION Observe proper polarity, as indicated in the

connection diagram with dc power connections.

Reverse polarity, or application of ac voltage,

could damage the module.

DC (10-40V) Current Limiting Output Module 9

Publication 1771ĆIN033B-EN-P - July 2002

IMPORTANT

You can use a DC (10-40V) Output Module (cat.

no. 1771-OBDS) to directly drive terminals on

the following modules:

•DC (10-30V) Input module (cat. no.

1771-IBD)

•DC (20-60V) Input module (cat. no.

1771-ICD)

•DC (12-24V) Input module (cat. no. 1771-IB)

See below for direct connection to a 1771-ICD

input module.

Use the same dc supply to power both

modules to ensure that ground is at the same

potential.

Driving an Input Module with an Output Module

D (10Ć40V) urrent Limiting Output Module

( at. No. 1771ĆOBDS) ( at. No. 1771ĆI D)

D (20Ć60V) Input Module

10Ć40V dc

Output 00

Output 01

Output 02

Output 03

Output 04

Output 05

Output 06

Output 07

Output 10

Output 11

Output 12

Output 13

Output 14

Output 15

Output 16

Output 17

+dc

Ćdc

+dc

Input 00

Input 01

Input 02

Input 03

Input 04

Input 05

Input 06

Input 07

Input 10

Input 11

Input 12

Input 13

Input 14

Input 15

Input 16

Input 17

Not used

dc ommon

Not used

Actual wiring runs in this direction. 10420ĆI

DC (10-40V) Current Limiting Output Module10

Publication 1771ĆIN033B-EN-P - July 2002

Each output of the module is capable of withstanding a short circuit

condition. When an output is shorted, it will become ”latched off,”

but its corresponding status indicator will remain lighted. Once the

short circuit is removed from that output, the output image table bit

for that output must be reset by ”toggling” the bit off and then back

on. This resumes normal operation. This toggling procedure can be

done several ways, depending on your system setup:

•modifying the data table

•switching the programmable controller from RUN to PROGRAM

mode, and back again

•cycling power to the system.

The front panel of your module contains one green module active

indicator, 16 red status indicators and one red fuse blown indicator.

The green module active indicator lights when the module is

powered, the processor keyswitch is on ”run”, and the opto-isolators

and data paths are functioning properly. It turns off if a fault occurs

in the data paths or the opto-isolators. The module then resets its

outputs or sets them to last state.

The module active indicator must be on to properly interpret the red

status indicators. The red status indicators are provided for indication

of individual outputs. They indicate the state to which the transistor

is commanded by the processor and are powered by circuitry within

the module. The indicators will turn on and off as commanded by the

processor. They do not indicate the presence or absence of dc power

at an output terminal. However, all output status indicators will turn

off if the fuse is blown.

The fuse blown indicator turns on when the fuse is blown. When the

fuse blown indicator is lit, check the fuse. After checking the fuse,

make sure the field wiring arm is firmly in place. Do this before

checking the status of the other indicators.

A TIVE

Module Active

Indicator (green)

00 to 17 Status

Indicators (red)

FUSE Fuse Blown

Indicator (red)

10421ĆI

Short Circuit Protection

Interpreting the Status

Indicators

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