Rockwell / Allen-Bradley 1771-IA and 1771
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AC/DC (120V) Input Module
Cat. No. 1771-IA, -IA2
Installation Data
To The Installer
This document provides information on:
important pre–installation considerations
power supply requirements
installing the module
using the indicators for troubleshooting
module specifications
Pre-installation Considerations
These modules contain input filtering to limit the effects of voltage
transients caused by contact bounce and/or radiated electrical noise. The
delay due to filtering is nominally 24+10ms for turning ac inputs on or off;
and 10+4ms for turning dc inputs on, 20+9ms for turning dc inputs off.
These modules are designed to operate with ac proximity switches such as
Allen–Bradley Bulletin 871P and other input devices with an off–state
leakage current less than 2.8mA.
Power Requirements
Your module receives its power through the 1771 I/O chassis backplane
from the chassis power supply. The module requires 75mA 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.
Installation Data
AC/DC (120V) Input Module
Cat. No. 1771-IA, -IA2
Installing Your Module
In this section we tell you how to key your I/O chassis, install your module
and make your wiring connections.
Keying Your I/O Chassis
Use the plastic keying bands, shipped with each I/O chassis, to key the I/O
slots to accept only this type of module.
The module circuit board is slotted in two places on the rear edge. The
position of the keying bands on the backplane connector must correspond
to these slots to allow insertion of the module. You can key any connector
in an I/O chassis to receive this module except for the left–most connector
reserved for adapter or processor modules. Place keying bands between the
following numbers labeled on the backplane connector:
Between 4 and 6
Between 10 and 12
You can change the position of these keys if system redesign and rewiring
makes insertion of a different module necessary.
Installing the Input Module
To install the AC/DC input module in your 1771 I/O chassis, follow the
steps listed below.
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.
2
1.
Position the module so that the circuit board on the rear of the module
lines up with the top and bottom card guides in the chassis.
2.
Slide the module into the chassis.
3.
Press firmly to seat the module in the chassis backplane connector.
4.
Swing the module locking latch down into place over the front of the
module.
Installation Data
AC/DC (120V) Input Module
Cat. No. 1771-IA, -IA2
Connecting Wiring to the Module
You make connections to the module through the 1771–WA field wiring
arm shipped with the module. The arm pivots on the chassis to connect
with the 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.)
ATTENTION: The field wiring arm terminal identification
number is not the same as the number of the bit which controls
that output.
Figure 1
Connection Diagram
Not used
A
Input 0
O
Input 1
1
Input 2
2
Input 3
3
Input 4
4
Input 5
5
Input 6
6
Input 7
7
L2
B
(Actual wiring runs in this direction.)
L1
120V AC High
or +DC
L2
AC Low
or DC Common
10967-I
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Installation Data
AC/DC (120V) Input Module
Cat. No. 1771-IA, -IA2
4.
Connect one terminal of your 2–wire input device to terminals 0 thru
7 (Figure 1).
5.
Connect terminal B to the L2 (low) ac return or dc common. Terminal
A is not used.
6.
Connect L1 (high) ac line or +dc line to the other terminal of your
input devices. Use stranded 14 or 16 gauge wire to minimize the
voltage drop over long cable distances.
Important: You can use an AC (120V) Output Module (cat. no.
1771–OA) to directly drive terminals on an AC/DC (120V) Input Module
(cat. no. 1771–IA, –IA2) (Figure 2), but you must connect a 2.5K ohm,
10W resistor between the output terminal and L2 (common) as shown in
Figure 2. Use the same ac power source to power both modules to
ensure proper phasing and prevent module damage.
Figure 2
Driving an Input with an Output
AC/DC (120V)
Input Module
(Cat. No. 1771-IA, -IA2)
AC (120V)
Output Module
(Cat. No. 1771-OA)
L1
A
L1
O
O
1
1
2
2
3
3
4
4
5
Typically
2.5K ohm
10 Watt
Resistor
6
7
L2
A
AC High
5
6
7
8
8
L2
AC Low
10968-I
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Installation Data
AC/DC (120V) Input Module
Cat. No. 1771-IA, -IA2
Interpreting the Status
Indicators
The front panel of your module contains 8 orange neon status indicators
(Figure 3). The orange status indicators are provided for system logic side
indication of individual inputs. When an orange neon indicator lights,
voltage is present on the terminal. The module transfers this information to
the backplane for the processor to read.
Figure 3
Status Indicators
Not used
Input 0
Input 1
Input 2
Input 3
Input 4
Input 5
Input 6
Input 7
Status Indicators
10969-I
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Installation Data
AC/DC (120V) Input Module
Cat. No. 1771-IA, -IA2
Specifications
Inputs per Module
8
Module Location
1771 I/O chassis
Nominal Input Voltage
120V ac @ 47 - 63Hz
125V dc
Nominal Input Current
4.5mA @ 87V ac
5.0mA @ 92V ac
12.0mA @ 138V ac
7.4mA @ 125V dc
On-state Voltage Range
87V AC to 138V ac
97V DC to 138V dc
Maximum Off-state Voltage
46V ac peak
57V dc
Maximum Off-state Current
2.8mA ac peak or dc
Input Signal Delay
24+10ms, on or off for ac
10+4ms for turning on dc
20+9ms for turning off dc
Power Dissipation
10.7 Watts (max.), 0.4 Watts (min.)
Thermal Dissipation
36.5 BTU/hr (max.), 1.4 BTU/hr (min.)
Backplane Current
75mA
Opto-electrical Isolation
1500V ac rms
Environmental Conditions
Operational Temperature
Storage Temperature
Relative Humidity
Conductors
Wire Size
Category
Keying
EUROPE/MIDDLE
EAST/AFRICA
HEADQUARTERS
Allen-Bradley Europe B.V.
Amsterdamseweg 15
1422 AC Uithoorn
The Netherlands
Tel: (31) 2975/43500
Telex: (844) 18042
FAX: (31) 2975/60222
Publication
1771–2.1 – May 1990
6
Supersedes 1771–2.1 – April 1987
Catalog Number 1771-WA
Refer to Publication 1770-4.1, Programmable Controller Wiring and Grounding Guidelines.
With offices in major cities worldwide
WORLD
HEADQUARTERS
Allen-Bradley
1201 South Second Street
Milwaukee, WI 53204 USA
Tel: (1) 414 382-2000
Telex: 43 11 016
FAX: (1) 414 382-4444
14 gage stranded maximum
3/64 inch insulation maximum
11
Between 4 and 6
Between 10 and 12
Wiring Arm
1
0o to 60oC (32o to 140oF)
-40o to 85oC (-40o to 185oF)
5 to 95% (without condensation)
As a subsidiary of Rockwell International, one of the world’s largest technology
companies — Allen-Bradley meets today’s challenges of industrial automation with over
85 years of practical plant-floor experience. More than 11,000 employees throughout the
world design, manufacture and apply a wide range of control and automation products
and supporting services to help our customers continuously improve quality, productivity
and time to market. These products and services not only control individual machines but
integrate the manufacturing process, while providing access to vital plant floor data that
can be used to support decision-making throughout the enterprise.
ASIA/PACIFIC
HEADQUARTERS
Allen-Bradley (Hong Kong)
Limited
Room 1006, Block B, Sea
View Estate
28 Watson Road
Hong Kong
Tel: (852) 887-4788
Telex: (780) 64347
FAX: (852) 510-9436
CANADA
HEADQUARTERS
Allen-Bradley Canada
Limited
135 Dundas Street
Cambridge, Ontario N1R
5X1
Canada
Tel: (1) 519 623-1810
FAX: (1) 519 623-8930
LATIN AMERICA
HEADQUARTERS
Allen-Bradley
1201 South Second Street
Milwaukee, WI 53204 USA
Tel: (1) 414 382-2000
Telex: 43 11 016
FAX: (1) 414 382-2400
P/N 955107–16
Printed in USA
Looking for more information?
Visit us on the web at http://www.artisan-scientific.com for more information:
• Price Quotations • Drivers· Technical Specifications. Manuals and Documentation
Artisan Scientific is You~ Source for: Quality New and Certified-Used/Pre:-awned ECJuiflment
• Fast Shipping and DelIve1y
• Tens of Thousands of In-Stock Items
• Equipment Demos
• Hundreds of Manufacturers Supported
• Leasing / Monthly Rentals
Service Center Repairs
Experienced Engineers and Technicians on staff in our
State-of-the-art Full-Service In-House Service Center Facility
• Consignment
InstraView Remote Inspection
Remotely inspect equipment before purchasing with our
Innovative InstraView-website at http://www.instraview.com
We bUy used equipment! We also offer credit for Buy-Backs and Trade-Ins
Sell your excess. underutilized. and idle used equipment. Contact one of our Customer Service Representatives todayl
Talk to a live person: 88EM38-S0URCE fB88-887-68721 I Contact us by email: [email protected] I Visit our website: http://www.artisan-scientific.com
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