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.
Publication 1771-IN078A-EN-P - October 2002
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
Publication 1771-IN078A-EN-P - October 2002
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