Fast Response DC Input Module Cat. No. 1771-IT Installation Data To The Installer

Fast Response DC Input Module Cat. No. 1771-IT Installation Data To The Installer
Fast Response DC Input Module
Cat. No. 1771-IT
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
This module contains 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 1ms for turning DC inputs on or off.
ATTENTION: This module may not be suitable for use with
hard contact devices because its fast response could register
contact sources as input data. A DC input module (cat. no.
1771–IB) is recommended for interfacing with hard contacts.
Use this module with devices that benefit from very short delay times, such
as:
photoelectric switches
incremental encoders
dc proximity switches
Power Requirements
Your module receives its power through the 1771 I/O chassis backplane
from the chassis power supply. The module requires 74mA 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
Fast Response DC Input Module
Cat. No. 1771-IT
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 6 and 8
Between 32 and 34
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 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.
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.
Installation Data
Fast Response DC Input Module
Cat. No. 1771-IT
5.
Connect the wiring arm to the module.
6.
Make wiring connections to the field wiring arm as indicated in
Figure 1.
Connecting Wiring to the Input Module
Connections to the input module are made to the 10 terminal field wiring
arm (cat. no. 1771–WA) shipped with the module (Figure 1). 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.
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
DC Common
B
Static Switches
or
Pulse Input
+DC
+
12-24V DC
Supply
-
DC Common
(See applicable codes and laws.)
(Actual wiring runs in this direction.)
11839-I
Connect one terminal of your 2–wire input device to terminals 0 thru 7
(Figure 1).
Connect terminal B to the dc common. Terminal A is not used. Connect the
+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 a DC Output Driver Module (cat. no. 1771–OB)
to directly drive terminals on a Fast Response DC Input Module (cat. no.
1771–IT) (Figure 2). Use the same dc power source to power both
modules to ensure that common is at the same potential.
3
Installation Data
Fast Response DC Input Module
Cat. No. 1771-IT
Figure 2
Driving an Input with an Output
DC Output Driver Module
Fast Response DC Input Module
Cat. No. 1771-IT
Cat. No. 1771-OB
+
A
12-24V DC
Power Supply
A
O
O
1
1
2
2
3
3
4
4
5
5
6
6
7
7
B
B
11840-I
Interpreting the Status
Indicators
The front panel of your module contains 8 red status LED indicators
(Figure 3). The red status indicators are provided for system logic side
indication of individual inputs. When a red LED lights, the input is on.
Figure 3
Status Indicators
Not used
Input 0
Input 1
Input 2
Input 3
Input 4
Input 5
Input 6
Input 7
Status Indicators
11841-I
4
Installation Data
Fast Response DC Input Module
Cat. No. 1771-IT
Specifications
Inputs per Module
8
Module Location
1771 I/O chassis
Nominal Input Voltage
12-24V DC
Input Voltage Range
Logic 0: 0V min. to 4V max.
Logic 1: 10V min. to 27V max.
Nominal Input Current
8mA @ 12V DC
24mA @ 24V DC
Input Signal Delay
0.6ms (+0.2ms) on or off
Input Impedance
On: 1-2K ohms
Off: 2-3K ohms
Power Dissipation
5.9 Watts (max.), 0.4 Watts (min.)
Thermal Dissipation
20.0 BTU/hr (max.), 1.3 BTU/hr (min.)
Backplane Current
74mA
Opto-electrical Isolation
1500V AC (RMS)
Environmental Conditions
Operational Temperature
Storage Temperature
Relative Humidity
Conductors
Wire Size
Category
Keying
0o to 60oC (32o to 140oF)
-40o to 85oC (-40o to 185oF)
5 to 95% (without condensation)
14 gage stranded maximum
3/64 inch insulation maximum
21
Between 6 and 8
Between 32 and 34
Wiring Arm
Catalog Number 1771-WA
1 Refer to publication 1770-4.1, Programmable Controller Wiring and Grounding Guidelines.
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Publication
1771–2.22 – June 1990
6
Supersedes publication 1771–2.22 – October 1980
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Copyright 1991 Allen-Bradley Company, Inc. Printed in USA
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