Allen-Bradley 1791-32A0 User manual

1
32 Input AC Block I/O Module
Cat. No. 1791-32A0 Series B
Installation
Mount the block I/O module in a vertical (recommended) or horizontal position.
Allow sufficient room around the block for cooling air to flow through the block
module. Refer to Figure 1.
Figure 1
Mounting Dimensions for the Block I/O Module
Cat. No. 1791–32A0 (PLC version shown)
2 mounting holes
for #8 screws
1
30
4.35
(110.5)
3.35
(85.1)
6.95
(176.5) 6.60
(167.6)
0.5
(12.7)
6.95H x 4.35W x 3.85D
(176.5H x 1 10.5W x 98D)
Inches
(Millimeters)
Equipment
Grounding Stud
CAUTION: When tightening grounding
stud nut, do not exceed 15 in-lbs.
Block
Operating temperature
in air gap below module
must not exceed 60
oC
(140oF).
2.0 (50.8) air gap
on all 4 sides.
30
1
1791-32A0
120V ac INPUT
IN IN
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
GG+1
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
G
(G+1)
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
COMM
STATUS
RACK #
ALLENĆBRADLEY
Dimensions

Installation Instructions
Block I/O
Cat. No. 1791-32A0 Series B
2
Figure 2
Mounting on a DIN Rail
1. Hook top of slot over DIN rail.
2. While pressing block against rail, pull
down on locking levers.
3. When block is flush against rail, push up
on locking levers to secure block to rail.
Locking levers
DIN Rail
A-B Pt. No. 199-DR1
46277-3
EN 50022
(35 x 7.5mm)
Figure 3
Inserting Labels
A set of die-cut labels is supplied with your
module. Select the proper module
designation labels (PLC or SLC) for the front
door and terminal strips.
1. Remove labels from package. Select
correct labels for your application. (PLC
label is numbered 00–07 and 10–17. SLC
is numbered 00–07 and 08–15.)
3. Open clear front door . Insert module
designation label into slots in door .
2.
Remove plastic cover on terminal strip
by flexing in middle. Slip the terminal
designation label with power and RIO
designations into built-in holders in left
terminal strip cover . Flex cover slightly
to install. Repeat for the other
terminal strip using the remaining label.
2
3

Installation Instructions
Block I/O
Cat. No. 1791-32A0 Series B
3
T able A
Acceptable W iring Cables for Block I/O Connection
Use Cable Type
Remote I/O link Belden 9463
Input and output wiring Up to 14AWG (2mm2) stranded with
3/64 inch (1.2mm) insulation
Connect wiring as shown in Figure 4 or Figure 5.
Figure 4
Wiring Connections with PLC Family Programmable Controllers (refer
to T able B)
L2/NL1
RIO
1
30
PL
C
NOT
USED
NOT
USED
NOT
USED
NO
CONN
NO
CONN NO
CONN
NO
CONN
NO
CONN
30
1
GND
BLU
CLR
in
00
in 01
in 02
in 03
in 04
in 05
COM
1
NOT
USED
COM
1
COM
1
in 1 1
N
SHD
COM
2
in 10
in 12
in 13
in 14
in 15
in 16
in 17
COM
2
NOT
USED
COM
2
L1
in 07
in 06
in 00
in 01
in 02
in 03
in 04
in 05
in 10
in 12
in 13
in 14
in 15
in 16
in 17
in 07
in 06
in 1 1
COM
3
COM
3
COM
3
COM
4
COM
4
COM
4
COM 1 connections are internally connected together .
COM 2 connections are internally connected together .
COM 3 connections are internally connected together .
COM 4 connections are internally connected together .
1
2
29
30 1 2
29 30
L1
L2/N
L1
L2/N
L1
L2/N
L1
L2/N
NOTE:

Installation Instructions
Block I/O
Cat. No. 1791-32A0 Series B
4
Figure 5
Wiring Connections with SLC Family Processors (refer to Table B)
RIO
L1
L2/N
1
30
SLC L2/N
L1
GND
COM
1
BLU
CLR
in
00
in 01
in 02
in 03
in 04
in 05
in 06
in 07
COM
1
COM
1
NOT
USED
N
SHD
COM
2
in 08
in 1 1
in 12
in 13
in 14
in 15
COM
2
NOT
USED
COM
2
in 09
in 10
L1
NOTE: COM 1 connections are internally connected together .
COM 2 connections are internally connected together .
COM 3 connections are internally connected together .
COM 4 connections are internally connected together .
L1
L2/N
L1
L2/N
1
30
COM
3
in 00
in 01
in 02
in 03
in 04
in 05
in 06
in 07
COM
3
COM
3
NOT
USED
COM
4
in 08
in 1 1
in 12
in 13
in 14
in 15
COM
4
NOT
USED
COM
4
in 09
in 10
L1
L2/N
NOT
USED
NO
CONN
NO
CONN NO
CONN
NO
CONN
NO
CONN
1
2
29
30 12
29 30
The block I/O module has an equipment grounding stud on the lower left side of
the module. Connect this grounding stud to your equipment ground. Torque the
nut to 15 in-lbs maximum when connecting to your equipment ground.
ATTENTION: Do not overtighten the nut on the grounding stud
when connecting the wire. Damage to the module could result.
Refer to “Industrial Automation Wiring and Grounding Guidelines” (1770-4.1)
for further information.

Installation Instructions
Block I/O
Cat. No. 1791-32A0 Series B
5
T able B
Wiring Block Designations
1791–32A0 Series B Connector/Terminal
Connections Designation Description Left Conn. Right Conn.
Power
Connections
L1 ac hot 1
Power
Connections Nac neutral 3
GND Chassis ground 21
Remote I/O
Connections
BLU Blue wire – RIO 6
Remote I/O
Connections CLR Clear wire – RIO 8
SHD Shield – RIO 7
I/O Connections
in 00 thru in 07 Input 00 thru 07 16, 18, 20,
22, 24, 26,
28, 30
Input
(G)6
COM 1 L2/N Input Common 10, 12, 142
Input
(G)6COM 2 L2/N Input Common 9, 11, 133
PLC: in 10 thru in 17
SLC: in 08 thru in 15 PLC: Input 10 thru 17 SLC: Input 08 thru 15
15, 17, 19,
21, 23, 25,
27, 29
in 00 thru in 07 Input 00 thru 07 15, 13, 11,
9, 7, 5, 3, 1
Input
(G+1)7
COM 3 L2/N Input Common 21, 19, 174
Input
(G+1)7COM 4 L2/N Input Common 22, 20, 185
PLC: in 10 thru in 17
SLC: in 08 thru in 15 PLC: Input 10 thru 17 SLC: Input 08 thru 15 16, 14, 12, 10, 8, 6, 4, 2
Not used For internal test only;
not for customer use. 4, 5 29, 27, 26
No Conn No internal connection;
customer can use. 30, 28, 25, 24, 23
1
Connect chassis ground to equipment grounding stud. These are not internally connected.
2
Left connector terminals 10, 12 and 14 are internally connected together .
3
Left connector terminals 9, 1 1 and 13 are internally connected together
4
Right connector terminals 21, 19 and 17 are internally connected together
5
Right connector terminals 22, 20 and 18 are internally connected together
6
IN (G) = input module group (1 word).
7
IN (G+1) = input module group plus 1 word

SW1
SW2
Open cover to
access switches
1
30
Position = 1Position = 0
End View
1
30
87654321
01
87654321
01
NOTE: Set switch SW2–3 to 0 if this rack
will have a unique address (not
complemented). If this rack address
is a duplicate of another I/O block
or chassis, set the switch to 1 for
primary or 0 for complementary.
Refer to Table C for the
complementary I/O rack address.
Default Switch
Settings = 0
ATTENTION: Cycle power to the module after
setting the switches.
Only block I/O modules with all inputs or all
outputs can use complementary I/O.
Installation Instructions
Block I/O
Cat. No. 1791-32A0 Series B
6
Figure 6
Switch Settings
SW2–8
Not used
SW2–7
Not Used
SW2–6 Last I/O Group
(PLC-2 only)
0Not last rack
1Last rack
SW2–5 Processor
Restart/Lockout (PRL)
0Processor Restart
1Processor Lockout
SW2–4 Hold Last State
0Reset Outputs
1Hold Last State
SW2–3 Complementary I/O1
0Non-Complemented System
0Complementary Rack1
1Primary Rack1
1See note.
Communication Rate
SW2–2 SW2–1 Bits/s
0 0 57.6 K
0 1 115.2 K
1 0 230.4 K
1 1 230.4 K
Starting Quarter
SW1–2 SW1–1 Module
Group
0 0 0 (1st)
0 1 2 (2nd)
1 0 4 (3rd)
1 1 6 (4th)

Installation Instructions
Block I/O
Cat. No. 1791-32A0 Series B
7
1747-SN
Ra
1771-SN
Ra
PLC–2
Ra
PLC–5
Ra
PLC–5/250
Ra
PLC–3
Ra
SW1 Switch Position
Ra
ck
Number
Ra
ck
Number
Ra
ck
Number
Ra
ck
Number
Ra
ck
Number
Ra
ck
Number 8 7 6 5 4 3
Rack 0 Rack 1 Rack 1 Not V alid Rack 0 Rack 0 0 0 0 0 0 0
Rack 1 Rack 2 Rack 2 Rack 1 Rack 1 Rack 1 0 0 0 0 0 1
Rack 2 Rack 3 Rack 3 Rack 2 Rack 2 Rack 2 0 0 0 0 1 0
Rack 3 Rack 4 Rack 4 Rack 3 Rack 3 Rack 3 0 0 0 0 1 1
Rack 5 Rack 5 Rack 4 Rack 4 Rack 4 0 0 0 1 0 0
Rack 6 Rack 6 Rack 5 Rack 5 Rack 5 0 0 0 1 0 1
Rack 7 Rack 7 Rack 6 Rack 6 Rack 6 0 0 0 1 1 0
Rack 7 Rack 7 Rack 7 0 0 0 1 1 1
Rack 10 Rack 10 Rack 10 0 0 1 0 0 0
Rack 1 1 Rack 1 1 Rack 1 1 0 0 1 0 0 1
Rack 12 Rack 12 Rack 12 0 0 1 0 1 0
Rack 13 Rack 13 Rack 13 0 0 1 0 1 1
Rack 14 Rack 14 Rack 14 0 0 1 1 0 0
Rack 15 Rack 15 Rack 15 0 0 1 1 0 1
Rack 16 Rack 16 Rack 16 0 0 1 1 1 0
Rack 17 Rack 17 Rack 17 0 0 1 1 1 1
Rack 20 Rack 20 Rack 20 0 1 0 0 0 0
Rack 21 Rack 21 Rack 21 0 1 0 0 0 1
Rack 22 Rack 22 Rack 22 0 1 0 0 1 0
Rack 23 Rack 23 Rack 23 0 1 0 0 1 1
Rack 24 Rack 24 Rack 24 0 1 0 1 0 0
Rack 25 Rack 25 Rack 25 0 1 0 1 0 1
Rack 26 Rack 26 Rack 26 0 1 0 1 1 0
Rack 27 Rack 27 Rack 27 0 1 0 1 1 1
Rack 30 Rack 30 0 1 1 0 0 0
Rack 31 Rack 31 0 1 1 0 0 1
Rack 32 Rack 32 0 1 1 0 1 0
Rack 33 Rack 33 0 1 1 0 1 1
Rack 34 Rack 34 0 1 1 1 0 0
Rack 35 Rack 35 0 1 1 1 0 1
Rack 36 Rack 36 0 1 1 1 1 0
Rack 37 Rack 37 0 1 1 1 1 1
Rack 40 1 0 0 0 0 0
Rack 41 1 0 0 0 0 1
Rack 42 1 0 0 0 1 0
Rack 43 1 0 0 0 1 1
Rack 44 1 0 0 1 0 0
Rack 45 1 0 0 1 0 1
Rack 46 1 0 0 1 1 0
Rack 47 1 0 0 1 1 1
Rack 50 1 0 1 0 0 0

When configured as complementary I/O:
PLC-2 can scan racks 01–07
PLC-5/1 1 can scan rack 03
PLC-5/20, PLC-5/30, PLC-5/40, PLC-5/60
can scan racks 01–07
NOTE: Remote rack numbers which can
have a complementary rack are rack
numbers 01 thru 07 only .
Installation Instructions
Block I/O
Cat. No. 1791-32A0 Series B
8
SW1 Switch Position
PLC–3
Rack
Number
PLC–5/250
Rack
Number
PLC–5
Rack
Number
PLC–2
Rack
Number
1771-SN
Rack
Number
1747-SN
Rack
Number 345678
PLC–3
Rack
Number
PLC–5/250
Rack
Number
PLC–5
Rack
Number
PLC–2
Rack
Number
1771-SN
Rack
Number
1747-SN
Rack
Number Rack
51 1 0 1 0 0 1
Rack 52 1 0 1 0 1 0
Rack 53 1 0 1 0 1 1
Rack 54 1 0 1 1 0 0
Rack 55 1 0 1 1 0 1
Rack 56 1 0 1 1 1 0
Rack 57 1 0 1 1 1 1
Rack 60 1 1 0 0 0 0
Rack 61 1 1 0 0 0 1
Rack 62 1 1 0 0 1 0
Rack 63 1 1 0 0 1 1
Rack 64 1 1 0 1 0 0
Rack 65 1 1 0 1 0 1
Rack 66 1 1 0 1 1 0
Rack 67 1 1 0 1 1 1
Rack 70 1 1 1 0 0 0
Rack 71 1 1 1 0 0 1
Rack 72 1 1 1 0 1 0
Rack 73 1 1 1 0 1 1
Rack 74 1 1 1 1 0 0
Rack 75 1 1 1 1 0 1
Rack 76 1 1 1 1 1 0
Not V alid 1 1 1 1 1 1
Rack address 77 is an illegal configuration.
PLC-5/1 1 processors can scan rack 03.
PLC-5/15 and PLC-5/20 processors can scan racks 01–03.
PLC-5/25 and PLC-5/30 processors can scan racks 01–07.
PLC-5/40 and PLC-5/40L processors can scan racks 01–17.
PLC-5/60 and PLC-5/60L processors can scan racks 01–27.
PLC-5/250 processors can scan racks 00–37.
T able C
PLC–2 and PLC–5 With Complementary I/O
PLC–2
Ra
PLC–5
Ra
SW1 Switch Position
Ra
ck
Number
Ra
ck
Number 8 7 6 5 4 3
Rack 1 Not V alid 0 0 1 0 0 0
Rack 2 Rack 1 0 0 1 0 0 1
Rack 3 Rack 2 0 0 1 0 1 0
Rack 4 Rack 3 0 0 1 0 1 1
Rack 5 Rack 4 0 0 1 1 0 0
Rack 6 Rack 5 0 0 1 1 0 1
Rack 7 Rack 6 0 0 1 1 1 0
Rack 7 0 0 1 1 1 1

Installation Instructions
Block I/O
Cat. No. 1791-32A0 Series B
9
The SLC 500 controllers communicate with the block I/O using an I/O Scanner
module (cat. no. 1747-SN series A). Refer to the user manual for the 1747-SN/A
Scanner module for more information.
Important: This block I/O module is not compatible with the 1747-DSN
Distributed I/O Scanner module.
Termination Resistor
A termination resistor must be installed on the last block in a series. Connect the
resistor as shown in Figure 7.
Figure 7
Installing the T ermination Resistor
Termination
Resistor
Connect
termination resistor across
terminals 6 (BLU) and 8 (CLR).
10835–I
BLU SHD
CLR
150 ohm – 57.6K and 115.2K baud
82 ohm – 230.4K baud
ATTENTION: Devices that are operating at 230.4K baud must have
82 ohm terminators in place for proper operation.

Installation Instructions
Block I/O
Cat. No. 1791-32A0 Series B
10
Indicators
PLC SLC
ININ
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
COMM
STATUS
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
COMM
STATUS
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
G G+1 ININ
G G+1
Indicator Description
COMM OFF
ON
Flashing
Communication not established
Communication established
Processor in Program mode
STATUS OFF
ON
Flashing
Normal
Error (hardware or software), block power low
COMM F AIL – communication cable disconnected, 100ms between valid frames, no
more than 255 valid frames between valid frames addressed to block, 20ms idle
time exceeded.
COMM and ST A TUS will alternately flash when processor restart lockout is selected, a fault has occurred and the processor
is communicating with the block.
Fusing
The block I/O module is internally fused to protect the module. No external
power fusing is required.

Installation Instructions
Block I/O
Cat. No. 1791-32A0 Series B
11
1791-32A0 Specifications
Input Specifications
Inputs per Block 32 (4 groups of 8)
Nominal Input Current 11.0mA
Nominal Input Voltage 120V ac
On–state Voltage Range 79–132V ac, 47–63Hz
Off-state Voltage Maximum 35V
On-state Current Minimum
Maximum 5mA @ 79V, 60Hz 12.3mA @ 132V, 60Hz
Off-state Current Minimum 2.3mA (60Hz)
Input Impedance Maximum 15K ohms @ 60Hz
Input Signal Delay Off to on
On to off 1.0ms 26ms (maximum) (allows for 1/2 cycle
dropout)
Specifications continued on next page

Installation Instructions
Block I/O
Cat. No. 1791-32A0 Series B
12
General Specifications
External Power (internally protected -
no external fuse required)
Voltage
Current 85–132V ac, 47–63Hz
150mA
Dimensions Inches
Millimeters 6.95H X 4.35W X 3.85D 176.5H X 110.5W X 98D
Isolation Power supply to RIO
I/O Group-to-Group
I/O Group-to-Logic
500V ac
1250V ac
1250V ac
Power Dissipation Maximum 13.62 Watts
Thermal Dissipation Maximum 46.44 BTU/hr
Environmental Conditions
Operational Temperature
Storage Temperature
Relative Humidity
0 to 60oC (32 to 140oF)
–40 to 85oC (–40 to 185oF)
5 to 95% noncondensing
Conductors Wire Size
Category
14 gauge (2mm2) stranded maximum
3/64 inch (1.2mm) insulation maximum
11
1You
use this conductor category information for planning conductor routing as described in
the system level installation manual.
With offices in major cities worldwide
WORLD HEADQUARTERS
Allen-Bradley
1201 South Second Street
Milwaukee, WI 53204 USA
Tel: [phone]
Telex: 43 11 016
FAX: [phone]
Publication 1791-5.14 – May 1995
Supersedes publication 1791-2.14 – March 1994 PN 955122–60
Copyright 1995 Allen-Bradley Company, Inc. Printed in USA