Rockwell Automation 1771-OD User Manual

Installation Instructions

AC (120V) Isolated Output
Module

(Catalog Number 1771-OD)

To The Installer

Important User
Information

This document provides information on:

To See page

Important User Information 1

Pre-installation Considerations 4

Suppression 4

Calculate Power Requirements 5

Determine Module Placement 5

Prevent Electrostatic Discharge 5

Key the Backplane Connector 6

Install the Module and Field Wiring Arm 7

Connect Wiring to the Module 8

For this reference information See page

Interpreting the Status Indicators 10

Replacing a Fuse 10

Specifications 11

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.

Publication 1771-IN078A-EN-P - October 2002

AC (120V) Isolated Output Module2

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

!

ATTENTION

!

IMPORTANT

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.

Identifies information about practices or
circumstances that may lead to personal injury or
death, property damage, or economic loss.

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

Publication 1771-IN078A-EN-P - October 2002

AC (120V) Isolated Output Module 3

ATTENTION

!

Environment and Enclosure

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.

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AC (120V) Isolated Output Module4

Pre-installation
Considerations

An output from this module can drive an Allen–Bradley Size 5
motor starter, provided its supply voltage does not drop below 105V
ac. The maximum load current the module can deliver is 2A per
channel, not to exceed 6A total per module.

The switching device in the output circuit is a triac. There is a small
leakage current in the off state due to both triac and capacitive
characteristics. The maximum leakage current per output is 5ma at
138V ac. Nominal leakage current is 1ma. The on-state voltage drop
across the output terminals is no more than 2.0V ac at 100ma.

The triac needs a minimum of 60ma load current to stay on. If your
device pulls less than 60ma, the triac will not operate. The total
continuous current the module supports is 6A (2A maximum per
channel). If this rating is exceeded, the module overheats and
damage may occur.

ATTENTION

When using a remote I/O system with a PLC
processor, use only the 1771-AS or 1771-AR
remote I/O adapter module which is series B or

!

later. These remote I/O adapters add additional
capability for shorted data bus detection. Failure
to use series B or later remote I/O adapters may
result in damage to equipment and/or personal
injury.

Suppression

Surge suppression circuitry is provided for the output of the triacs of
this module. To suppress high-voltage transients from the ac line, a
metal-oxide varistor (MOV) is provided between each set of
terminals on the module. In each output circuit, an RC network
limits the magnitude of voltage transients that may occur when a
device is wired in parallel or series with hard contacts.

Loads with inductive characteristics may require additional
suppression devices. The impedance characteristic of the load is the
most important factor in selecting a suppression device; thus no
single suppression device can be recommended for every possible
load. See table a for acceptable suppression devices for typical loads.

Table A
AllenĆBradley Suppressors

AllenĆBradley Equipment

Motor Starter Bulletin 509 599-K04

Motor Starter Bulletin 709 1401-N10

Relay Bulletin 700 Type N or P 700-N5/700N9

Miscellaneous 700-N24

1 For starters with 120V ac coils
2 Maximum coil voltage 150V ac or dc
3 Bulletin 77-N24 is a universal surge suppressor. You can use it on electromagnetic

devices with limitation of 35 sealed VA, 150V.

Suppressor Catalog Number

1

1

3

4

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AC (120V) Isolated Output Module 5

Calculate Power
Requirements

Determine Module
Placement

The isolated output module is powered by the power supply
connected to the I/O chassis backplane. The module requires a
maximum current of 225mA from the +5V dc output of this supply.
Total the current requirements of this module with the other modules
in the I/O chassis to avoid overloading the supply or the I/O chassis
backplane.

Group your modules to minimize adverse effects from radiated
electrical noise and/or heat. We recommend the following:

• Group analog input and low voltage dc modules away from ac

modules or high voltage dc modules to minimize electrical noise
interference.

• Place analog input modules and other I/O modules sensitive to

heat away from slot power supplies and rack controllers to
minimize adverse heat effects.

ATTENTION

!

Preventing Electrostatic 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.

The 1771–OD 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.

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AC (120V) Isolated Output Module6

Key the Backplane Connector

Place your module in any slot in the chassis
except the leftmost slot which is reserved for
processors or adapters.

ATTENTION

!

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.

Position the keying bands in the backplane connectors to correspond to
the key slots on the module.

I/O chassis

You can change the position of these bands if
subsequent system design and rewiring makes
insertion of a different type of module necessary.

Place the keying bands:

- between 4 and 6

- between 30 and 32

Upper
Connector

11022ĆI

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AC (120V) Isolated Output Module 7

Install the Module and Field
Wiring Arm

1

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

locking tab

card guides

ATTENTION

!

Remove power from the 1771 I/O chassis
backplane and 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.

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

locking bar pin

locking bar

card guides

Snap the chassis latch over
the top of the module to secure it.

2

Attach the wiring arm (1771ĆWD) 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.

Module

Swing the chassis locking bar down into place to secure
the modules. Make sure the locking pins engage.

horizontal bar

remove

install

Module

19809

wiring arm

1771ĆWD

17643

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AC (120V) Isolated Output Module8

Connect Wiring to the
Module

You make connections to the module through the 1771-WD field
wiring arm shipped with the module. The arm pivots on the chassis
to connect with the 8 terminals on the front of the module. The
wiring arm allows the module to be removed from the chassis
without disconnecting wiring.

1. Make certain all power is removed from the module before
making wiring connections.

2. Swing the wiring arm up into position on the front of the module.
The locking tab on the module will secure it into place.

3. Make your connections to the field wiring arm as shown in
Figure 1. (Use the label on the front of the wiring arm to identify
your wiring.)

The field wiring arm terminal identification

IMPORTANT

number is not the same as the number of the bit
which controls that output.

You should identify the labels on the wiring arm with the name or
number of the device connected at each terminal.

Figure 1
Connection Diagram for the 1771ĆOD Isolated Output Module

L1

Output 0A

Output 0B

Output 1A

Output 1B

Output 2A

Output 2B

Output 3A

Output 3B

Output 4A

Output 4B

Output 5A

Output 5B

(Actual wiring runs in this direction.)

If multiple power sources are used, do not exceed the specified isolation voltage.

1

2

3

4

5

6

7

8

9

10

11

12

120V ac Supply

L2

Load

11884-I

Publication 1771-IN078A-EN-P - October 2002

AC (120V) Isolated Output Module 9

You can use an output of the 1771–OD module to drive an input of a
120V AC input module (1771–IA, –IA2, –ID and –IAD) to indicate
status, such as the turning on of a motor starter (Figure 2). Both
modules must be powered by the same ac source. In addition, you
must add an external resistor (or an electronic snubber, pt. no.
RG–1676–1) between the output terminal and the common (L2)
(Figure 2). Typically, this is a 2.5K ohm, 10W resistor.

AC (120V) Isolated Output Module

1771-OD

120V ac

1

2

3

4

5

6

7

8

9

10

11

12

L1

Supply

2.5K ohm
10 Watt

Resistor

AC (120V) Input Module

1771-IA

L2

A

O

1

2

3

4

5

6

7

B

ATTENTION

Do not connect the 1771-OD output channels in
series. Doing so can result in distortion of the output
waveform causing the output devices to chatter.

!

Figure 2
Using an Output Module to drive an Input Module

AC (120V) Isolated Output Module

1771-OD

L1 L2

1

2

3

4

5

6

7

8

9

10

11

12

120V ac

Supply

2.5K ohm
10 Watt
Resistor

AC/DC (120V) Input Module

1771-IAD

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

Publication 1771-IN078A-EN-P - October 2002

11885-I

AC (120V) Isolated Output Module10

Interpreting the Status
Indicators

The module has 12 status indicators (Figure 3). The top 6 indicators
show the state of each output and are driven by the logic circuitry on
the programmable controller side of the module. These indicators
light when their corresponding outputs are energized.

The bottom 6 indicators display a blown–fuse condition at the
respective output regardless of the state of the output. This indicator
is driven by your field device power supply.

Figure 3
Status Indicators

00
01

Red Output

02

Status Indicators

03
04
05
00
01

Clear FuseĆBlown

02

Status Indicators

03
04
05

11886-IA

Replacing a Fuse

Each module output is individually fused. You can easily access the
module fuse by removing the front component-side cover.

Remove power from the 1771 I/O chassis

ATTENTION

backplane and wiring arm before removing or
installing the module.

• Failure to remove power from the backplane or

!

field 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.

If a blown fuse occurs:

1. Turn off power to the I/O chassis backplane.

2. Pivot the wiring arm away from the module and pull the module

from the I/O chassis.

3. Remove the front half of the protective cover from the unlabeled
side of the module by removing the two slotted screws.

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AC (120V) Isolated Output Module 11

4. Replace the blown fuse with a 5A, 250V Bussman MTH5, IEC
127 Type F fuse.

5. Replace the protective cover and install the module in the I/O
chassis.

6. Reposition the wiring arm.

7. Restart system power.

Specifications

Outputs per Module 6

Module Location 1771 I/O chassis

Output Voltage Range 92 to 138V ac @ 47 - 63Hz

Output Current Rating 2.0A per output - not to exceed 6A per module

Surge Current (maximum) 20A maximum for 100ms at 120V ac, repeatable every 5s

Minimum Load Current 60mA per output @ 120V ac, 60Hz

On State Voltage Drop 2V at 100mA

Off State Leakage Current (max.) 5mA per output @ 138V ac

Power Dissipation 13.2 Watts (max.), 1.2 Watts (min.)

Thermal Dissipation 45.2 BTU/hr (max.), 4.1 BTU/hr (min.)

Adjacent Slot Power Dissipation 10 Watts

Backplane Current 225mA @ 5V dc 5%

Maximum Cable Length 1000 ft (304.8m)

Opto-electrical Isolation Tested to 1200V ac channelĆtoĆchannel for 1s

Tested to 1800V ac backplaneĆtoĆchannel for 1s

Environmental Conditions

Operational Temperature IEC 60068-2-1 (Test Ad, Operating Cold)

Storage Temperature IEC 60068-2-1 (Test Ab, Unpackaged, Nonoperating Cold)

Relative Humidity IEC 60068-2-30 (Test Db, Unpackaged, Nonoperating Damp Heat)

Shock

Operating
Nonoperating

Vibration IEC 60068-2-6 (Test Fc, Operating)

Enclosure Type Rating None (open style)

Keying Between 4 and 6

Specifications continued on next page.

IEC 60068-2-2 (Test Bd, Operating Dry Heat)
IEC 60068-2-14 (Test Nb, Operating Thermal Shock)
32 to 140°F(0to60°C)

IEC 60068-2-2 (Test Bb, Unpackaged, Nonoperating Dry Heat)
IEC 60068-2-14 (Test Na, Unpackaged, Nonoperating Thermal Shock)

-40 to 185°F(-40to85°C)

5 to 95% noncondensing

IEC 60068-2-27 (Test Ea, Unpackaged Shock)
30g
50g

2g @ 10-500Hz

Between 30 and 32

Publication 1771-IN078A-EN-P - October 2002

AC (120V) Isolated Output Module12

Fuses 5A, 250V Bussman MTH5, IEC 127 Type F

Field Wiring Arm Cat. No. 1771-WD

Field Wiring Arm Screw Torque 7-9 pound-inches (0.8-1.0Nm)

Conductors Wire Size

Certifications
(when product is marked)

1 One or two 14-22 AWG solid or stranded copper wires per terminal. Must be same size. Do not intermix solid and stranded wires.

Use copper wire only.

2 Use this conductor category information for planning conductor routing . Refer to publication 1770Ć4.1, Industrial Automation Wiring and

Grounding Guidelines."

Category

14-22AWG (2.5-0.25mm2) stranded copper wire rated at 75oCor

1

greater
3/64 inch (1.2mm) insulation (max)

2

1

UL UL Listed Industrial Control Equipment

CSA CSA Certified Process Control Equipment

Publication 1771-IN078A-EN-P - October 2002

Supersedes Publication 1771Ć2.12 - April 1990

Publication 1771-IN078A-EN-P - October 2002

Copyright 2002 Rockwell International, Inc. Printed in USA

PN957689-80