Rockwell Automation 1771-ODD User Manual

Installation Instructions

AC (120V) Isolated Output
Module, 16 Outputs

(1771-ODD Series B)

Contents

Prevent Electrostatic
Damage

Use this document as a guide when installing the catalog number
1771-ODD series B output module.

To See page

Prevent Electrostatic Discharge 1
Understand Compliance to European Union Directives 2
Important Preinstallation Considerations 2
Calculate Power Requirements 4
Setting the Mode of the FuseĆBlown Jumper 4
Key the Backplane Connector 5

Install the Module and Field Wiring Arm 6

Connect Wiring to the Field Wiring Arm 7

For this reference information See page

Interpret the Status Indicators 9
Replacing a Fuse 10
CSA Hazardous Location 11
Specifications 12

The ac isolated output module is shipped in static-shielded packaging
to guard against electrostatic discharge damage. Observe the
following precautions when handling the module.

Electrostatic Discharge Damage

ATTENTION: Electrostatic discharge can damage
integrated circuits or semiconductors if you touch

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backplane connector pins. Follow these guidelines
when you handle the module:

• Touch a grounded object to discharge static potential

• Wear an approved wrist-strap grounding device

• Do not touch the backplane connector or

connector pins

• Do not touch circuit components inside the module

• If available, use a static-safe work station

• When not in use, keep the module in its original

static-shielded packaging

Publication 1771Ć5.20 - January 1999

AC (120V) Isolated Output Module, 16 Outputs2

European Union Directive
Compliance

If this product has the CE mark it is approved for installation within
the European Union and EEA regions. It has been designed and
tested to meet the following directives.

EMC Directive

This product is tested to meet Council Directive 89/336/EEC
Electromagnetic Compatibility (EMC) and the following standards,
in whole or in part, documented in a technical construction file:

• EN 50081-2EMC – Generic Emission Standard, Part 2 –

Industrial Environment

• EN 50082-2EMC – Generic Immunity Standard, Part 2 –

Industrial Environment

This product is intended for use in an industrial environment.

Low Voltage Directive

This product is tested to meet Council Directive 73/23/EEC
Low Voltage, by applying the safety requirements of EN 61131–2
Programmable Controllers, Part 2 – Equipment Requirements and
Tests.

Important PreĆinstallation
Considerations

For specific information required by EN 61131-2, see the appropriate
sections in this publication, as well as the following Allen-Bradley
publications:

• Industrial Automation Wiring and Grounding Guidelines For

Noise Immunity, publication 1770-4.1

• Guidelines for Handling Lithium Batteries, publication AG-5.4

• Automation Systems Catalog, publication B111

This equipment is classified as open equipment and must be mounted
in an enclosure during operation to provide safety protection.

An output from this module can drive an Allen-Bradley Size 5 motor
starter, provided its supply voltage does not drop below 92V ac. The
maximum load current the module can deliver is 2A per channel, not
to exceed 8A total per module.

Your module’s outputs can drive the following motor starter
combinations:

• 16 size 3 motor starters (1 per output)

• 10 size 4 motor starters (1 per output)

• 7 size 5 motor starters (1 per output)

Publication 1771Ć5.20 - January 1999

AC (120V) Isolated Output Module, 16 Outputs 3

The switching device in the output circuit is a solid-state 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 3mA at 138V ac. Nominal leakage current is 1.5mA. The on-state
voltage drop across the output terminals will not exceed 1.5V ac
at 2A.

The 1771-ODD/B module is designed for a 10mA minimum current
on each output circuit. The total continuous current the module
supports is 8A (2A maximum per channel). If this rating is
exceeded, the module overheats and damage may occur.

Suppression

Surge suppression circuitry is provided for the output triacs in 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 NO TAG for acceptable suppression devices for typical
loads.

Table A
AllenĆBradley Suppressors

AllenĆBradley Equipment Suppressor Catalog Number

Motor Starter Bulletin 509 599ĆK04

Motor Starter Bulletin 709 1401ĆN10

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

Miscellaneous 700ĆN24

1

For starters with 120V AC coils

2

Bulletin 700ĆN24 is a universal surge suppressor. You can use it on electromagnetic devices with the limitation of

35 sealed VA, 150V.

1

1

2

Determining Module Placement in the I/O Chassis

You can place your module in any I/O module slot of the I/O chassis
except for the left-most slot. The left-most slot is reserved for
programmable controller processors or adapter modules. Group your
modules to minimize adverse effects from radiated electrical noise
and/or heat. We recommend the following:

Publication 1771Ć5.20 - January 1999

AC (120V) Isolated Output Module, 16 Outputs4

ATTENTION: Remove power from the 1771 I/O
chassis backplane and wiring arm before removing or

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installing an I/O module.

• Failure to remove power from the backplane or wir-

ing 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.

• 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 to minimize adverse heat
effects.

Calculate Power Supply
Requirements

Setting the Mode of the
FuseĆBlown Jumper

The isolated output module is powered by the power supply
connected to the I/O chassis backplane. The module requires a
maximum current of 300mA 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.

The fuse-blown jumper has two modes:

• the preset, standard (STD) mode – displays the fuse status on

the red fuse-blown status indicator

• the customer side indication (CSI) mode – displays the fuse

status in the input image table and on the red fuse-blown status
indicator. This mode configures the module as a 16 point output
module that utilizes both the output and input image data
tables of your controller. Each channel has its own image table
bit. When a fuse blows, the corresponding bit in the associated
input image table will turn on (1).

For example, if you install the module in a PLCĆ5 system and address the module
as O:012, then the fuse status bits are in I:012.

Publication 1771Ć5.20 - January 1999

To monitor the status of the module fuses, make certain that your
user program monitors the module’s input image table for ‘‘on” bits.

ATTENTION: Do not put the module jumper in
CSI mode when you use this module in a

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complementary mode. Your system will not operate
properly.