Publication 0300125-02 Rev. B
Isolated AC/DC (22O/24O V) Input Module
16 Discrete Inputs
Cat. No. 1771sc-IMI16
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
Throughout this document, we use the following symbol to make you aware
of safety considerations:
This symbol identifies information about practices or circumstances that can lead
!
Please read all the information in this document before installing the product.
This document assumes a full working knowledge of the relevant PLC.
to equipment damage, personal injury, or death. This symbol helps you identify
a hazard, avoid the hazard, and recognize the consequences.
Installation Data
AC/DC (220/240 V) Input Module
Cat. No. 1771sc-IMI16
Important Pre-Installation
Considerations This module must be used with a 1771 Series B (or later) I/O chassis.
This module contains input filtering to limit the effects of voltage transients
caused by contact bounce and/or radiated electrical noise. This filtering cannot
be turned off. The delay due to filtering is:
• Off to On 11 ± 6 ms for AC
3 ± 2 ms for DC
• On to Off 29 ± 8 ms for AC
30 ± 7 ms for DC
This module is designed to operate with input devices such as limit switches,
float switches, selector switches, push-buttons, and proximity switches. A
simplified schematic for this module appears in Figure 1.
Figure 1
Simplified Schematic
1771
Backplane
System
Circuitry
(filtering)
56.2 k½
Opto
Isolation
250 ½
0.15 µf
AC High
or DC Positive
Input
Indication
LED
56.2 k½
AC Low
or DC Common
The module is shipped in a static-shielded container to guard against electrostatic
discharge damage. Observe the following precautions when handling the module:
CAUTION
!
ELECTROSTATICALLY SENSITIVE COMPONENTS
Observe the following precautions to guard against electrostatic damage:
¥ Wear an approved wrist strap grounding device, or touch a grounded
object to discharge yourself before handling the module.
¥ Do not touch the gold backplane connector or connector pins.
¥ If available, use a static-free work station.
¥ Keep the module in a static-shielded bag when not in use or during
shipment.
Failure to observe these precautions can degrade performance or damage the
module.
2
Installation Data
AC/DC (220/240 V) Input Module
Cat. No. 1771sc-IMI16
Power Supply Requirements Your module receives its power from the chassis power supply through the
1771 I/0 chassis backplane. The module requires 100 mA, maximum, from the
output of this supply. Add this to the requirements of all other modules in the
I/O chassis to prevent overloading of the chassis backplane and/or backplane
power supply.
Installing The Module In this section, we tell you how to key your I/O chassis, install your module,
and connect your wiring.
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 three places on the rear edge. The position
of the keying bands on the backplane connector must correspond to these slots
in order to insert your module. You can key any connector in an I/0 chassis to
receive this module except for the left-most connector, which is reserved for
adapter or processor modules.
Place keying bands between the following numbers labeled on the backplane
connector:
• Between 2 and 4
• Between 12 and 14
You can change the position of these keys if system redesign and rewiring
makes inserting a different module necessary.
Installing The Module In Your Chassis
To install the 1771sc-IMI16 in your 1771 I/0 chassis, follow these steps:
WARNING
!
POSSIBLE EQUIPMENT DAMAGE AND OPERATION
Always remove power from the 1771 I/0 chassis backplane and wiring arm
before removing or installing an I/O module.
¥ Failure to remove power from the backplane or wiring arm can cause module
damage, degraded performance, or injury.
¥ Failure to remove power from the backplane can also cause injury or equipment
damage due to possible unexpected operation.
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Installation Data
AC/DC (220/240 V) Input Module
Cat. No. 1771sc-IMI16
1. Turn off power to the I/O chassis.
2. Place the module in the plastic tracks on the top and bottom of the slot that
guides the module into position.
3. Do not force the module into its backplane connector. Apply firm, even
pressure on the module to seat it properly.
4. Snap the chassis latch over the top of the module to secure its position.
5. Connect the wiring arm to the module, as detailed below.
Connecting Wiring to the Input Module
Connections to the input module are made to the 40-terminal field wiring arm
(cat. no. 1771-WN) shipped with the module (Figure 2). Attach the wiring arm
to the pivot bar on 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.
Connect your input wiring to the field wiring arm as shown in Figure 2. Each
input channel has a positive and negative terminal. Connect only one wire to
a terminal. When multiple connections to a terminal are required, use an auxiliary
terminal strip.
CE Compliance Requirements
For installations requiring CE compliance, you must do the following:
• Use a minimum wire size of 16 AWG.
• Observe the grounding guidelines provided in Allen-Bradley’s 1771 Universal
I/O Chassis Installation Data Sheet.
• Hard wire or permanently connect the PLC to the power main, or provide
a pin and sleeve (IEC 309) connector for connection to the power main.
This equipment is intended for use in over-voltage category II installation (see
IEC 364-4-443), where the rated mains supply voltage does not exceed 1 kVac
(50/60 Hz) or 1.5 kVdc. If the input power is rated above these levels, ensure
that your system is isolated from the power main by an isolation transformer
(or equivalent over-voltage device) that has CE approval or approval from a
European test agency.
You must also protect against electrical shock by installing the I/O chassis in
an enclosure with an IP20 to IP29 rating per IEC 529. The enclosure should
have warning labels (hazard symbol 417-IEC-5036) and/or a mechanical
disconnect to minimize the risk of accidental shock during maintenance. Use
an enclosure that can only be opened with a key or tool.
4
Installation Data
AC/DC (220/240 V) Input Module
Cat. No. 1771sc-IMI16
Figure 2
Connection Diagram
Terminal Function *
1 Input 00 +
2 Input 00 -
L1
220/240 V
AC/DC Supply
L2
AC Low
or DC Common
WARNING
!
EXPLOSION HAZARD
Never connect or disconnect equipment
while circuit is live unless area is known to
be non-hazardous.
Failure to observe these precautions can cause
equipment damager, personal injury or death.
2
L2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
L1
220/240 VAC High
or DC Positive
WARNING
!
HIGH LEAKAGE CURRENT
Before wiring field devices to your module,
ensure that the PLC has been properly
grounded
Failure to observe this precaution can cause
equipment damage or personal injury.
(Actual wiring runs in this direction.)
Always follow the applicable codes and
laws in your area.
3 Input 01 +
4 Input 01 -
5 Input 02 +
6 Input 02 -
7 Input 03 +
8 Input 03 -
9 Not used
10 Not used
11 Input 04 +
12 Input 04 -
13 Input 05 +
14 Input 05 -
15 Input 06 +
16 Input 06 -
17 Input 07 +
18 Input 07 -
19 Not used
20 Not used
21 Input 10 +
22 Input 10 -
23 Input 11 +
24 Input 11 -
25 Input 12 +
26 Input 12 -
27 Input 13 +
28 Input 13 -
29 Not used
30 Not used
31 Input 14 +
32 Input 14 -
33 Input 15 +
34 Input 15 -
35 Input 16 +
36 Input 16 -
37 Input 17 +
38 Input 17 -
39 Not used
40 Not used
* Input numbers are
shown in octal.
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Installation Data
AC/DC (220/240 V) Input Module
Cat. No. 1771sc-IMI16
Important: You can use an AC (220/240 V) Output Module (cat. no. 1771scOMI16) to drive terminals on the 1771sc-IMI16, as sho wn in Figure 3. Use the
same AC power source to power both modules to ensure proper phasing
and prevent module damage. (Note: the 1771sc-OMI16 is an isolated output
module.)
Figure 3
Driving an Input with an Output
AC/DC (220/240 V)
Isolated Input Module
(Cat. No. 1771sc-IMI16)
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
AC (220/240 V)
Isolated Output Module
(Cat. No. 1771sc-OMI16)
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
220 VAC
L2
AC low
Supply
L1
AC high
6
Installation Data
AC/DC (220/240 V) Input Module
Cat. No. 1771sc-IMI16
Using the Indicators
For Troubleshooting The front panel of your module contains one green module active indicator and
16 red channel active indicators (Figure 4). After successfully communicating
with the PLC, the module will illuminate the green module active indicator.
The 16 red status indicators illuminate when the associated input channel is
active (on).
This module contains no user-serviceable parts, and should be returned to the
factory for repair if necessary.
Note that these modules contain components which are susceptible to damage
from electrostatic discharge (ESD). An electrostatic charge can accumulate on
the surface of ordinary plastic wrapping or cushioning material. In the unlikely
event that a module should need to be returned to Spectrum Controls,
please ensure that the unit is enclosed in approved ESD packaging (such
as a static-shielding / metallized bag or black conductive container).
Spectrum Controls reserves the right to void the warranty on any unit that is
improperly packaged for shipment.
For further information or assistance, please contact your local distributor, or
call the Spectrum Controls Customer Satisfaction department at (425) 7469481 from 8:00 A.M. to 5:00 P.M. Pacific Time.
Figure 4
Status indicators
Notice
The products and services described in this publication are useful in a wide
variety of applications. Therefore, the user and others responsible for applying
the products and services described herein are responsible for determining
their acceptability for each application. While efforts have been made to provide
accurate information within this publication, Spectrum Controls assumes no
responsibility for the accuracy, completeness, or usefulness of the information
contained herein. Under no circumstances will Spectrum Controls be responsible
or liable for any damages or losses, including indirect or consequential damages
or losses, arising out of either the use of any information contained within this
publication or the use of any product or service referenced herein. No patent
liability is assumed by Spectrum Controls with respect to the use of any of the
information, products, circuits, programming, or services referenced herein.
The information contained in this publication is subject to change without notice.
Limited Warranty
Spectrum Controls warrants that its products are free from defects in material
and workmanship under normal use and service, as described in Spectrum
Controls literature covering this product, for a period of 1 year. Spectrum Controls
obligations under this warranty are limited to replacing or repairing, at its option,
at its factory or facility, any product which shall, in the applicable period after
shipment, be returned to the Spectrum Controls facility, transportation charges
prepaid, and which after examination is determined, to the satisfaction of
Spectrum Controls, to be thus defective. This warranty shall not apply to any
such equipment which shall have been repaired or altered except by Spectrum
Controls or which shall have been subject to misuse, neglect, or accident. In
no case shall Spectrum Controls liability exceed the purchase price. The
aforementioned provisions do not extend the original warranty period of any
product which has either been repaired or replaced by Spectrum Controls.
ACTIVE
00 10
01 11
02 12
03 13
04 14
05 15
06 16
07 17
Module Active Indicator (green)
Channel Active Indicators (red), 00 to 17 (octal)
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Installation Data
AC/DC (220/240 V) Input Module
Cat. No. 1771sc-IMI16
U.S.A. Headquarters
Spectrum Controls, Inc., P.O. Box 5533
Bellevue, Washington 98006
Fax: (425) 641-9473 ¥ Tel: (425) 746-9481
Specifications (Cat. No. 1771sc-IMI16)
Inputs per Module 16 (isolated)
Module Location 1771 I/O chassis
Nominal Input Voltage 220/240 VAC @ 50/60 Hz
250 VDC
Nominal Input Current
@ 220 VAC, 50 Hz 11.44 mA
@ 220 VAC, 60 Hz 14.08 mA
@ 250 VDC 2.16 mA
Input Signal Delay See page 1 of this publication.
On-state Current (minimum)
@ 159 VAC, 50 Hz 6.30 mA
@ 159 VAC, 60 Hz 8.00 mA
@ 184 VDC 1.30 mA
On-state Voltage (range) 159 to 264 VAC
184 to 276 VDC
Off-state Current (maximum)
@ 70 VAC 2.8 mA
@ 50 VDC 0.35 mA
Off-state Voltage (maximum) 70 VAC; 50 VDC
Input Impedance 250 ½ in series with a parallel combination of
0.15 µF and 112.4 k½
Power Dissipation 11.5 W max.; 0.10 W min.
Thermal Dissipation 39.2 BTU/hr max.; 0.34 BTU/hr min.
Backplane Current 100 mA max.
Isolation Voltage 1500 VAC channel-to-channel
1500 VAC channel-to-backplane
Environmental Conditions
Operational Temperature 0¡ to 60¡C (32¡ to 140¡F)
Storage Temperature -40¡ to +85¡C ( -40¡ to 185¡F)
Relative Humidity 5 to 95% (without condensation)
Certifications CE per Council Directives 89/336/EEC for EMC
and 73/23/EEC for Low Voltage
Conductors Wire Size 14 gage stranded, maximum
3/64 inch insulation, maximum
Category 1
2
Keying Between 2 and 4
Between 12 and 14
Field Wiring Arm A-B Catalog #1771-WN
Wiring Arm Screw Torque 7 to 9 inch-pounds
1
Max. with all 16 inputs turned on (100% duty cycle); Min. with no inputs turned on.
2
Use this conductor-category information for planning conductor routing as described
in the system-level installation manual.
The Encompass logo is a trademark of Allen-Bradley Company, Inc. © 1998 Spectrum Controls,
Inc. All rights reserved. Specifications subject to change without notice. Printed in U.S.A.
Publication 0300125-02 Rev. B August 1998
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