Rockwell Automation 1771-A2BSS, 1771-A3B1SS User Manual
Installation Instructions
Cat. No. 1771-A2BSS and 1771-A3B1SS
What This Document Contains
To the Installer
Prepare for Installation
I/O-group-label set (cat. no. 1771-XB)
This publication covers the cat. no. 1771-A2BSS special 8-slot, and
the cat. no. 1771-A3B1SS special 12-slot stainless steel versions of
the universal 1771 I/O chassis.
To install an I/O chassis you See page
prepare for installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
allow sufficient mounting space . . . . . . . . . . . . . . . . . . . . . . 2
mount the I/O chassis and ground bus . . . . . . . . . . . . . . . . . 4
ground the chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
set the power supply configuration jumper . . . . . . . . . . . . . . . 8
set the switches on the backplane assembly . . . . . . . . . . . . . 9
provide power to the I/O chassis . . . . . . . . . . . . . . . . . . . . . 9
install I/O modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Make sure you have these items:
Hardware kit (cat. no. 1771-RK)
plastic keying bands
18 – 1771-A2BSS
27 – 1771-A3B1SS
1 star washer
1 cup washer
4 flat washers
2 #10–32 nuts
with captive lock washers
10
Documentation
(if you are installing I/O modules or power supplies)
I/O Module
Cat. No. 1771-
xxx
User
Power Supply
Cat. No. 1771-Px
Installation Data
Output Module
Cat. No. 1771-
Installation Data
Manual
Power Supply Modules
Cat. No. 1771-
Installation Data
xx
xx
Power Supply Chassis
Cat. No. 1771-
xxx
Installation Data
for your:
• programmable controller or I/O adapter module
• external power supply and/or power supply chassis
(if you are using external power supplies)
• communication modules and/or I/O modules
• power-supply modules
Publication 1771–5.60 – May 1999
Universal I/O Chassis2
13082
Allow Sufficient Mounting Space
B
153mm
(6”)
For these mounting dimensions See page
I/O chassis 3
I/O chassis with external power supply 3
Important: Make sure you meet these minimum spacing
requirements.
C
102mm
(4”)
51mm
E
(2”)
wiring duct
E
51mm (2”)
D
153mm
(6”)
A
102mm
(4”)
102mm
(4”)
C
D
D
Minimum
A
is 102mm (4 inches).
Minimum vertical separation between major components is 153mm (6 inches).
B
Minimum horizontal separation between major components is 102mm
C
(4 inches).
Minimum vertical distance between a major component and the top or
D
bottom of an enclosure is 153mm (6 inches).
Minimum distance between major components and wiring ducts or terminal
E
strips is 51mm (2 inches).
153mm (6”)
distance between a major component and the sides of an enclosure
wiring duct
Publication
1771–5.60 – May 1999
1771-A2B
SS
1771-A2B
12451-
1771-A3B1SS
I/O Chassis Mounting Dimensions
use 1/4-20 (M6 x 10)
mounting bolts (four places)
1
193mm
(7.60”)
315mm
(12.41”)
Universal I/O Chassis 3
464mm
(18.25”)
337mm
(13.25”)
12-slot 1771-A3B1SS
8–slot 1771–A2BSS
254mm
(10”)
power
SS
1771-A3B1SS
You can mount 1771-P1, -P2, -P7 and
-PS7 power supplies on the left side
plate of the I/O chassis, or up to 5
cable-feet from the I/O chassis.
connector
grounding stud
171mm
(6.75”)
483mm
(19.01”)
356mm
(14.01”)
8–slot 1771–A2BSS
12-slot 1771-A3B1SS
I/O Chassis with External Power Supply Mounting Dimensions
use 1/4-20 (M6 x 10)
mounting bolts (four places)
315mm
(12.41”)
1771-P1
1771-P2
1771-P7
1771-PS7
Power Supply
464mm
(18.25”)
337mm
(13.25”)
12-slot 1771-A3B1SS
8–slot 1771–A2BSS
254mm
(10”)
grounding
stud
91mm
(3.6”)
483mm
(19.01”)
356mm
(14.01”)
Publication
8–slot 1771–A2BSS
12-slot 1771-A3B1SS
I
1771–5.60 – May 1999
Universal I/O Chassis4
Mount the I/O Chassis and Ground Bus
If you have this I/O chassis Type of mount
1771-A2BSS panel mount (rear mount)
1771-A3B1SS panel mount (rear mount)
Each enclosure must contain a central ground bus. The ground bus
is the common connection for each chassis within the enclosure and
the enclosure itself. Use either bolts or welded studs to mount the
I/O chassis and central ground bus. If you are mounting a chassis to
the back panel of an enclosure, use 1/4-20 (M6 x 10) mounting bolts.
Stud Mounting of the Back-panel to the Back Wall of the Enclousure Bolt Mounting of a Ground Bus or Chassis to the Back-panel
scrape
nut
back-panel
paint on panel
star washer
wall of enclosure
back
welded
stud
Use
a wire brush to remove
paint from threads to
provide a ground connection.
ground bus or
mounting bracket
ground lug
nut
scrape
back-panel
tapped hole
paint on panel
star washer
flat washer
flat washer
bolt
17664
star washer
Stud Mounting of a Ground Bus or Chassis to the Back-panel
back wall of enclosure
mounting bracket
or ground bus
ground lug
nut
flat
washer
star washer
scrape
paint from threads
flat washer
scrape
paint from mounting
bracket or ground bus
ATTENTION: If the mounting brackets of a chassis
do not lay flat before the nuts are tightened, use
!
additional washers as shims so that the chassis will not
be warped by tightening the nuts. Warping a chassis
could damage the backplane and cause poor
connections.
17665
welded stud
17666
Publication
1771–5.60 – May 1999
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