Installation Instructions
AC (120V) Isolated Output
Module
(Catalog Number 1771-OD)
To The Installer
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
Important User
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
2
AC (120V) Isolated Output Module
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
!
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
IMPORTANT successful application and understanding of the
product.
Publication 1771-IN078A-EN-P - October 2002
AC (120V) Isolated Output Module
ATTENTION
!
3
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
4
AC (120V) Isolated Output Module
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
!
Suppression
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.
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
Suppressor Catalog Number
Motor Starter Bulletin 509
599-K041
Motor Starter Bulletin 709
1401-N101
Relay Bulletin 700 Type N or P
700-N5/700N93
Miscellaneous
700-N244
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.
Publication 1771-IN078A-EN-P - October 2002
AC (120V) Isolated Output Module
Calculate Power
Requirements
Determine Module
Placement
5
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.
Publication 1771-IN078A-EN-P - October 2002
6
AC (120V) Isolated Output Module
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
!
Position the keying bands in the backplane connectors to correspond to
the key slots on the module.
Place the keying bands:
- between 4 and 6
- between 30 and 32
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.
I/O chassis
Upper
Connector
You can change the position of these bands if
subsequent system design and rewiring makes
insertion of a different type of module necessary.
Publication 1771-IN078A-EN-P - October 2002
11022ĆI
7
AC (120V) Isolated Output Module
Install the Module and Field
Wiring Arm
1
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, ĆA3B, ĆA3B1, ĆA4B I/O chassis
1771ĆA1B, ĆA2B, ĆA3B1, ĆA4B Series B I/O chassis
locking tab
locking bar
locking bar pin
card guides
card guides
Module
Snap the chassis latch over
the top of the module to secure it.
2
Module
Swing the chassis locking bar down into place to secure
the modules. Make sure the locking pins engage.
19809
wiring arm
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.
1771ĆWD
remove
horizontal bar
install
17643
Publication 1771-IN078A-EN-P - October 2002
8
AC (120V) Isolated Output Module
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
Output 0A
1
Output 0B
2
Output 1A
3
Output 1B
4
Output 2A
5
Output 2B
6
Output 3A
7
Output 3B
8
Output 4A
9
Output 4B
10
Output 5A
11
Output 5B
12
L1
120V ac Supply
L2
Load
11884-I
(Actual wiring runs in this direction.)
If multiple power sources are used, do not exceed the specified isolation voltage.
Publication 1771-IN078A-EN-P - October 2002
9
AC (120V) Isolated Output Module
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.
ATTENTION
!
AC (120V) Isolated Output Module
1771-OD
L1 120V ac L2
Supply
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) Input Module
1771-IA
AC (120V) Isolated Output Module
1771-OD
A
1
2
O
2
3
1
3
4
2
4
5
3
5
6
4
6
7
5
7
6
8
7
9
B
10
1
8
9
10
2.5K ohm
10 Watt
Resistor
11
11
12
12
L1
120V ac
Supply
2.5K ohm
10 Watt
Resistor
AC/DC (120V) Input Module
1771-IAD
L2
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
11885-I
Publication 1771-IN078A-EN-P - October 2002
10
AC (120V) Isolated Output Module
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
02
03
04
05
00
01
02
03
04
05
Red Output
Status Indicators
Clear FuseĆBlown
Status Indicators
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.
ATTENTION
!
Remove power from the 1771 I/O chassis
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.
Publication 1771-IN078A-EN-P - October 2002
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)
IEC 60068-2-2 (Test Bd, Operating Dry Heat)
IEC 60068-2-14 (Test Nb, Operating Thermal Shock)
32 to 140°F (0 to 60°C)
Storage Temperature
IEC 60068-2-1 (Test Ab, Unpackaged, Nonoperating Cold)
IEC 60068-2-2 (Test Bb, Unpackaged, Nonoperating Dry Heat)
IEC 60068-2-14 (Test Na, Unpackaged, Nonoperating Thermal Shock)
-40 to 185°F (-40 to 85°C)
Relative Humidity
IEC 60068-2-30 (Test Db, Unpackaged, Nonoperating Damp Heat)
5 to 95% noncondensing
Shock
Operating
Nonoperating
IEC 60068-2-27 (Test Ea, Unpackaged Shock)
30g
50g
Vibration
IEC 60068-2-6 (Test Fc, Operating)
2g @ 10-500Hz
Enclosure Type Rating
None (open style)
Keying
Between 4 and 6
Between 30 and 32
Specifications continued on next page.
Publication 1771-IN078A-EN-P - October 2002
12
AC (120V) Isolated Output Module
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
14-22AWG (2.5-0.25mm2) stranded copper wire rated at 75oC or
greater1
3/64 inch (1.2mm) insulation (max)
12
Wire Size
Category
Certifications
(when product is marked)
UL
UL Listed Industrial Control Equipment
CSA
CSA Certified Process Control Equipment
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."
Publication 1771-IN078A-EN-P - October 2002
Supersedes Publication 1771Ć2.12 - April 1990
Publication 1771-IN078A-EN-P - October 2002
PN957689-80
Copyright 2002 Rockwell International, Inc. Printed in USA
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