Allen-Bradley 1771-OBN User manual

DC (1030V) Output Module
Cat. No. 1771OBN
Installation Instructions
This document provides information on:
important pre-installation considerations
power supply requirements
installing the module
connecting the wiring
using the indicators on the module for troubleshooting
module specifications
The 1771-OBN dc output module is a source output and requires a sink
input. A sink input provides a path to ground and a source output provides
a positive voltage path.
Use this module in all 1771 I/O chassis except 1771-A1, -A2 and 1771-A4
chassis. Refer to the table below for processor compatibility.
Table A
Processor
Compatibility Chart
System Type Use with Processors:
Local MiniPLC2/02(cat. no. 1772LZ, LZP)
MiniPLC2/16 (cat. no. 1772LX, LXP)
MiniPLC2/17 (cat. no. 1772LW, LWP)
PLC5/15, Series B and later (cat. no. 1785LT)
Remote (with a 1771ASB
remote I/O adapter)
PLC2/20(cat. no. 1772LP2)
PLC2/30 (cat. no. 1772LP3)
PLC3(cat. no. 1775L1, L2, L3, L4)
PLC3/10 (cat. no. 1775LP4, LP8)
PLC5/15, Series B and later (cat. no. 1785LT)
Do not place this module in the same I/O chassis as the 1771-IX
thermocouple module. You can use this module in the same chassis as the
1771-IXE thermocouple module.
To The Installer
Preinstallation
Considerations

DC (10 - 30V) Output Module
(Cat. No. 1771-OBN)
Installation Instructions
2
The controller or I/O chassis power supply, connected through the
backplane of the I/O chassis, powers the logic circuitry of the output
modules. The maximum current drawn from this supply is 330mA.
In this section we tell you how to initially handle your module, key your
I/O chassis, install your module and make your wiring connections.
Initial Handling Procedures
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.
The output module contains components which can be damaged by
electrostatic discharge. The module is shipped in an electrostatic shielded
bag for protection. Follow the handling procedures outlined below to guard
against damage to your module.
Touch a grounded object to discharge yourself before handling the
module.
Do not touch the backplane connector or connector pins.
If you configure or replace internal components, do not touch other
circuit components inside the module. If available, use a static-safe
work station.
When not in use, keep the module in its static-free shield bag.
Power Supply Requirements
Installing Your Module

DC (10 - 30V) Output Module
(Cat. No. 1771-OBN)
Installation Instructions
3
Keying the I/O Chassis
Use the plastic keying bands, shipped with each I/O chassis, to key your
I/O slots to accept only this type of module. Place the keying bands on the
chassis backplane between:
14 and 16
20 and 22
Slots on the rear edge of the circuit board are matched to these slots to
allow insertion of this type of module. You can key any connector in an I/O
chassis to receive this module except for the leftmost connector reserved
for adapter or processor modules.
Inserting the Module Into the Chassis
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 edge
of the module.
Connecting Wiring to the Module
You make connections to the module through the field wiring arm cat. no.
1771-WN. The arm pivots on the I/O chassis to connect with terminals on
the front of the module and acts as a terminal strip. 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.

DC (10 - 30V) Output Module
(Cat. No. 1771-OBN)
Installation Instructions
4
I/O Module Groups
Each module condenses 2 full module groups (32 outputs) into each I/O
chassis slot. For example:
Module group 1 = outputs 00 through 17
Module group 2 = outputs 00 through 17 (module group 2
represents the second set of outputs).
In Figure 1, terminals 1 through 20 represent module group 1. Terminals
21 through 40 represent module group 2. Terminals 10, 20, 30 and 40 are
DC common and terminals 1, 11, 21 and 31 are DC power.
Figure 1
Connection
Diagram for the 1771OBN DC Output Module
Output 0
Output 2
Output 4
Output 6
Common 0
Output 10
Output 12
Output 14
Output 16
Common 1
Output 0
Output 2
Output 4
Output 6
Common 2
Output 10
Output 12
Output 14
Output 16
Common 3
+ dc
Output 1
Output 3
Output 5
Output 7
+ dc
Output 11
Output 13
Output 15
Output 17
+ dc
Output 1
Output 3
Output 5
Output 7
+ dc
Output 11
Output 13
Output 15
Output 17
+
-
dc
Supply
dc Output
Device
(See applicable codes and laws.)
-
+
Note: Terminals on the left are
even numbered (2 thru 40) , and
terminals on the right are odd
numbered (1 thru 39). 2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
(Actual wiring runs in this direction.) 11850I

DC (10 - 30V) Output Module
(Cat. No. 1771-OBN)
Installation Instructions
5
ATTENTION: Miswiring or shorting the output terminals will
cause permanent damage to this module.
ATTENTION: Observe proper polarity with dc power
connections. Reverse polarity, or application of ac voltage could
damage the module.
Table B
Module
Output T erminal Assignments
Terminal
Number Output Assignment I/O program address Terminal Number Output Assignment I/O program address
01 110 to 30V dc  21 110 to 30V dc 
02 Output 00 0RG00 22 Output 00 0RG00
03 Output 01 0RG01 23 Output 01 0RG01
04 Output 02 0RG02 24 Output 02 0RG02
05 Output 03 0RG03 25 Output 03 0RG03
06 Output 04 0RG04 26 Output 04 0RG04
07 Output 05 0RG05 27 Output 05 0RG05
08 Output 06 0RG06 28 Output 06 0RG06
09 Output 07 0RG07 29 Output 07 0RG07
10 Common 0  30 Common 2 
11 110 to 30V dc  31 110 to 30V dc 
12 Output 10 0RG10 32 Output 10 0RG10
13 Output 11 0RG11 33 Output 11 0RG11
14 Output 12 0RG12 34 Output 12 0RG12
15 Output 13 0RG13 35 Output 13 0RG13
16 Output 14 0RG14 36 Output 14 0RG14
17 Output 15 0RG15 37 Output 15 0RG15
18 Output 16 0RG16 38 Output 16 0RG16
19 Output 17 0RG17 39 Output 17 0RG17
20 Common 1  40 Common 3 
Where: R = rack number (1, 2, 3, etc.)
G = I/O group (0  7)
1You
can connect a dif ferent power supply to each 10 to 30V dc terminal. They are not connected internally . Connect each common (0, 1, 2, 3) to the corresponding supply .
Commons are not internally connected.

DC (10 - 30V) Output Module
(Cat. No. 1771-OBN)
Installation Instructions
6
The module has 32 status indicators (Figure 2) on the module front plate.
These represent the control status of the outputs. Each indicator is lit when
its corresponding output is energized. An additional indicator is provided
to indicate a blown fuse condition.
Figure 2
Status
Indicators
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
Status Indicators (red)
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
FUSE
Fuse Blown Indicator
11851I
Interpreting the Status
Indicators

DC (10 - 30V) Output Module
(Cat. No. 1771-OBN)
Installation Instructions
7
To replace a blown fuse, proceed as follows:
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.
1. Turn off power to the chassis.
2. Remove the module from the I/O chassis.
3. Remove the blown fuse from the fuse holder (accessible through the
side cover), and replace with a 4A, 250V normal blow fuse.
4. Reinsert the module into chassis I/O chassis.
5. Turn on power to the chassis.
Replacing the Fuses

Specifications
DC (10 - 30V) Output Module
(Cat. No. 1771-OBN)
Installation Instructions
8
Outputs per module 32 (4 groups of 8)
Module Location 1771A1B thru A4B or later I/O Chassis
Voltage Rating 10 to 30V dc
Maximum Output Current 0.5A per output (not to exceed 8A per module)
2A per output group
Maximum Surge Current 2A per output for 10msecond; repeatable every 2 seconds.
5A per output group for 10msec.;repeatable every 2 seconds.
20A per module for 10msec.; repeatable every 2 seconds.
Maximum Onstate Voltage Drop 1.5V dc at 0.5A
Maximum Offstate Leakage Current 1.0mA @ 55oC
Maximum Power Rating 0.75W per output
Output Signal Delay On to Off
Off to On
2.0ms
0.1ms
Power Dissipation 13.7W (max); 1.7W (min)
Thermal Dissipation 46.7 BTU/hr (max); 5.7 BTU/hr (min)
Backplane Current 330mA @ 5V dc maximum
Isolation Voltage 1500V ac rms
Conductors Wire Size
Category
14 gauge stranded (max)
3/64 inch insulation (max)
Category 11
Environmental Conditions
Operational Temperature
Storage Temperature
Relative Humidity
0oto 60oC (32oto 140oF)
40oto 85oC (40oto 185oF)
5 to 95% (without condensation)
Keying Between 14 and 16
Between 20 and 22
Field Wiring Arm Cat. No. 1771WN
Field Wiring Arm Screw Torque 79 inchpounds
Fuses Four 4.0A, 250V normal blow fuses (1 per group)
1Refer
to publication 17704.1, Programmable Controller Wiring and Grounding Guidelines
PLC is a registered trademark of Allen-Bradley Company, Inc.
PLC is a registered trademark of Allen-Bradley Company, Inc.
PLC is a registered trademark of Allen-Bradley Company, Inc.
PLC is a registered trademark of Allen-Bradley Company, Inc.
PLC is a registered trademark of Allen-Bradley Company, Inc.
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Publication 17712.168  December 1994
Supersedes publication 17712.168  November 1991 and 17712.168-RN1 - September 1993
P/N 9551 1552
Copyright 1994 AllenBradley Company , Inc. Printed in USA