Allen-Bradley 1492 Digital I/O Conversion Module Installation Instructions
Allen-Bradley 1492 Digital I/O Conversion Module allows you to convert older 1771 I/O modules to the newer, more compatible 1756 platform. This conversion is accomplished without requiring the removal of any existing field wiring from the 1771 system. The module is designed to be installed in a 1492 Conversion Mounting Assembly. This conversion system includes the Conversion Module (1492-CM1771-LD001), a cable (1492-CONCAB005X) and a Mounting Assembly (1492-MUA...). The 1492 Conversion Mounting Assembly is dimensionally similar to the 1771 Chassis and can be mounted using the same hardware.
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Digital I/O Conversion Module
(Cat 1492-CM1771-LD001)
I. Description
This Digital I/O Conversion system provides for the conversion of (1) 1771, 16 point I/O modules to be converted to (1)
1756, 16 point I/O module and consists of the following:
(1) 1771 Modules (16pt) to (1) 1756 Module (16pt)
(2) Conversion Modules: 1492-CM1771-LD001
(1) Cable: 1492-CONCAB005X (Table 2)
(1) Conversion Mounting Assembly: 1492-MUA… (Table 1)
This conversion is accomplished without the removal of any field wires from the existing 1771 Swing Arm. The existing
1771 Swing Arm fits directly onto the edge connector of the 1492 Conversion Module. On one end of the 1492 Cable
is (1) connector for the Conversion Module. On the other end is the Removable Terminal Block (RTB) for the 1756 I/O
module, as shown in the photo below. The I/O signals are routed through the 1492 Conversion Module and the 1492
Cable to the appropriate terminals on the 1756 I/O module per the Wiring Diagrams in Section V. As standard, both
portions of the 1492 Cables are 0.5M long, but we also offer a 1.0M cable length. Refer to the footnotes in Table 2,
Section III for further details.
PN-114270
DIR 10000060084 (Version 01)
Publication 1492-IN035B-EN-E
Printed in U.S.A.
Conversion Compatibility and
Product I.D. Label
25-Pin Connector for cable 1492-CONCAB005X
De-energize and lockout any and all power to all I/O field devices connected to the A-B 1771 I/O
Chassis, and the power to the 1771 I/O Chassis itself. Ensure all power is de-energized and locked out to
any device in the control cabinet where the conversion is to be performed. Ensure work is performed by
qualified personnel.
WARNING
1492-CM1771-LD001 Conversion Module
(Cat 1492-CM1771-LD001)
I. Description
This Digital I/O Conversion system provides for the conversion of (1) 1771, 16 point I/O modules to be converted to (1)
1756, 16 point I/O module and consists of the following:
(1) 1771 Modules (16pt) to (1) 1756 Module (16pt)
(2) Conversion Modules: 1492-CM1771-LD001
(1) Cable: 1492-CONCAB005X (Table 2)
(1) Conversion Mounting Assembly: 1492-MUA… (Table 1)
This conversion is accomplished without the removal of any field wires from the existing 1771 Swing Arm. The existing
1771 Swing Arm fits directly onto the edge connector of the 1492 Conversion Module. On one end of the 1492 Cable
is (1) connector for the Conversion Module. On the other end is the Removable Terminal Block (RTB) for the 1756 I/O
module, as shown in the photo below. The I/O signals are routed through the 1492 Conversion Module and the 1492
Cable to the appropriate terminals on the 1756 I/O module per the Wiring Diagrams in Section V. As standard, both
portions of the 1492 Cables are 0.5M long, but we also offer a 1.0M cable length. Refer to the footnotes in Table 2,
Section III for further details.
PN-114270
DIR 10000060084 (Version 01)
Publication 1492-IN035B-EN-E
Printed in U.S.A.
Conversion Compatibility and
Product I.D. Label
25-Pin Connector for cable 1492-CONCAB005X
De-energize and lockout any and all power to all I/O field devices connected to the A-B 1771 I/O
Chassis, and the power to the 1771 I/O Chassis itself. Ensure all power is de-energized and locked out to
any device in the control cabinet where the conversion is to be performed. Ensure work is performed by
qualified personnel.
WARNING
1492-CM1771-LD001 Conversion Module
(2)
II. Installation
The 1492 Conversion Modules must be installed in a 1492 Conversion Mounting Assembly (see Table 1 below). A
complete System Installation Manual ships with the 1492 Conversion Mounting Assembly.
1) Determine the quantity of each type of 1771 I/O modules used in the 1771 I/O Chassis to be converted.
2) Select the applicable 1492 Conversion Modules from Table 2, Section III.
3) Review the Max Slots for I/O and Chassis Width data from the Table 1 below.
4) Select a 1756 I/O Chassis which has enough I/O Slots.
NOTE: (2) I/O slots are required in the 1756 Chassis for conversions where (1) 1771 I/O module converts to (2) 1756 I/O
modules.
5) Select the 1492 Conversion Mounting Assembly which has enough Conversion Module slots.
NOTE: (2) Conversion Module slots are required in the 1492 Conversion Mounting Assembly for conversions where (2)
1771 I/O module convert to (1) 1756 I/O modules.
NOTE: The 1492 Conversion Mounting Assembly has the same Height & Width foot-print as the 1771 Chassis and is
designed to use the same mounting hardware. The combined Depth of the 1492 Conversion Mounting Assembly with the
1756 Chassis mounted on top is 10.25 inches (Controller w/key) or 10.0 inches (Controller w/o key). Dimension drawings
are included in the System Installation Manual that ships with the 1492 Conversion Mounting Assembly.
1771-A3B is not listed as it is used for 19 inch wide instrumentation panels.
Notice that the 1756 Chassis Width sometimes exceeds the 1771 Chassis Width, with or without the Power
Supply. The Cover-Plate of the 1492 Conversion Mounting Assembly allows the 1756 Chassis to be Left justified,
Right justified or Centered. A complete System Installation Manual ships with the 1492 Conversion Mounting
Assembly.
PN-114270
DIR 10000060084 (Version 01)
Publication 1492-IN035B-EN-E
1771 Chassis 1756 Chassis Conversion Mounting Assembly
Chassis Width
Cat. No.
Max
Slots
for
I/O
without
Power
Supply
with
Power
Supply
Cat. No.
Max
Slots
for
I/O
Chassis
Width Cat. No.
Max Slots
for
Conversion
Modules
Chassis
Width
1756-A4 3 10.35
1771-A1B 4 9.01 12.61 1756-A7 6 14.49 1492-MUA1B-A4-A7 4 9.01
1756-A7 6 14.49
1771-A2B 8 14.01 17.61 1756-A10 9 19.02 1492-MUA2B-A7-A10 8 14.01
1756-A10 9 19.02
1771-A3B1 12 19.01 1756-A13 12 23.15 1492-MUA3-A10-A13 12 19.01
1756-A13 12 23.15
1771-A4B 16 24.01 1756-A17 16 29.06 1492-MUA4-A13-A17 16 24.01
Table 1: Bulletin 1771 to 1756 Chassis Conversion
II. Installation
The 1492 Conversion Modules must be installed in a 1492 Conversion Mounting Assembly (see Table 1 below). A
complete System Installation Manual ships with the 1492 Conversion Mounting Assembly.
1) Determine the quantity of each type of 1771 I/O modules used in the 1771 I/O Chassis to be converted.
2) Select the applicable 1492 Conversion Modules from Table 2, Section III.
3) Review the Max Slots for I/O and Chassis Width data from the Table 1 below.
4) Select a 1756 I/O Chassis which has enough I/O Slots.
NOTE: (2) I/O slots are required in the 1756 Chassis for conversions where (1) 1771 I/O module converts to (2) 1756 I/O
modules.
5) Select the 1492 Conversion Mounting Assembly which has enough Conversion Module slots.
NOTE: (2) Conversion Module slots are required in the 1492 Conversion Mounting Assembly for conversions where (2)
1771 I/O module convert to (1) 1756 I/O modules.
NOTE: The 1492 Conversion Mounting Assembly has the same Height & Width foot-print as the 1771 Chassis and is
designed to use the same mounting hardware. The combined Depth of the 1492 Conversion Mounting Assembly with the
1756 Chassis mounted on top is 10.25 inches (Controller w/key) or 10.0 inches (Controller w/o key). Dimension drawings
are included in the System Installation Manual that ships with the 1492 Conversion Mounting Assembly.
1771-A3B is not listed as it is used for 19 inch wide instrumentation panels.
Notice that the 1756 Chassis Width sometimes exceeds the 1771 Chassis Width, with or without the Power
Supply. The Cover-Plate of the 1492 Conversion Mounting Assembly allows the 1756 Chassis to be Left justified,
Right justified or Centered. A complete System Installation Manual ships with the 1492 Conversion Mounting
Assembly.
PN-114270
DIR 10000060084 (Version 01)
Publication 1492-IN035B-EN-E
1771 Chassis 1756 Chassis Conversion Mounting Assembly
Chassis Width
Cat. No.
Max
Slots
for
I/O
without
Power
Supply
with
Power
Supply
Cat. No.
Max
Slots
for
I/O
Chassis
Width Cat. No.
Max Slots
for
Conversion
Modules
Chassis
Width
1756-A4 3 10.35
1771-A1B 4 9.01 12.61 1756-A7 6 14.49 1492-MUA1B-A4-A7 4 9.01
1756-A7 6 14.49
1771-A2B 8 14.01 17.61 1756-A10 9 19.02 1492-MUA2B-A7-A10 8 14.01
1756-A10 9 19.02
1771-A3B1 12 19.01 1756-A13 12 23.15 1492-MUA3-A10-A13 12 19.01
1756-A13 12 23.15
1771-A4B 16 24.01 1756-A17 16 29.06 1492-MUA4-A13-A17 16 24.01
Table 1: Bulletin 1771 to 1756 Chassis Conversion
(3)
III. Compatiblity
Foot Notes:
To understand any issues concerning I/O module compatibility, refer to the Installation Manuals for the specific
1771 and 1756 I/O modules involved.
The 3 numbers indicate the cable length of each portion of the 1492 Cable. Recommended cable lengths of 0.5M
are shown. Additional cable lengths are as follows:
1.0M = 1492-CONCAB010X
PN-114270
DIR 10000060084 (Version 01)
Publication 1492-IN035B-EN-E
IV. Conversion Module Specifications
(Operating specifications are when installed in the Conversion System base / cover-plate assembly)
Specification
Dimensions
Approximate Shipping Weight
11.81 in. (height) x 4.38 in. (depth) x 1.5 in. (width)
300 mm. (height) x 111.25 mm (depth) x 38.1 mm (width)
258.3 g (0.59 lbs) (includes carton)
Storage Temperature -40 to +85°C (-40 to +185°F)
Operating Temperature 0 to 60°C (32 to 140°F)
Operating Humidity 5 to 95% at 60°C (non-condensing)
Shock
Non
-
operating
Operating
50g
30g
Operating Vibration 2g at 10 to 500Hz (Agrees with 1756 I/O module specifications)
Maximum Operating Voltage 132 Vac at 47 to 63Hz or 132 Vdc
Max. Module Operating Current
Per Point:
Per Module:
2 Amps
2 Amps
Agency Certifications UL Classified: Under UL File Number E113724
CSA
CE: compliant for all applicable directives
Pollution Degree 2
Environmental Rating IP20
Refer to the Wiring Diagram(s) for
current limits for a specific configuration.
NOTICE
Table 2: Bulletin 1771 to 1756 Conversion Modules and Cables
1771
Digital I/O Module
1756
Digital I/O Module
1492
Conversion Module
1492
Cable
1771-IAD 1756-IA16 1492-CM1771-LD001 1492-CONCAB005X
1771-IBD 1756-IB16 1492-CM1771-LD001 1492-CONCAB005X
1771-ICD 1756-IC16 1492-CM1771-LD001 1492-CONCAB005X
1771-IND 1756-IN16 1492-CM1771-LD001 1492-CONCAB005X
1771-IND1 1756-IN16 1492-CM1771-LD001 1492-CONCAB005X
III. Compatiblity
Foot Notes:
To understand any issues concerning I/O module compatibility, refer to the Installation Manuals for the specific
1771 and 1756 I/O modules involved.
The 3 numbers indicate the cable length of each portion of the 1492 Cable. Recommended cable lengths of 0.5M
are shown. Additional cable lengths are as follows:
1.0M = 1492-CONCAB010X
PN-114270
DIR 10000060084 (Version 01)
Publication 1492-IN035B-EN-E
IV. Conversion Module Specifications
(Operating specifications are when installed in the Conversion System base / cover-plate assembly)
Specification
Dimensions
Approximate Shipping Weight
11.81 in. (height) x 4.38 in. (depth) x 1.5 in. (width)
300 mm. (height) x 111.25 mm (depth) x 38.1 mm (width)
258.3 g (0.59 lbs) (includes carton)
Storage Temperature -40 to +85°C (-40 to +185°F)
Operating Temperature 0 to 60°C (32 to 140°F)
Operating Humidity 5 to 95% at 60°C (non-condensing)
Shock
Non
-
operating
Operating
50g
30g
Operating Vibration 2g at 10 to 500Hz (Agrees with 1756 I/O module specifications)
Maximum Operating Voltage 132 Vac at 47 to 63Hz or 132 Vdc
Max. Module Operating Current
Per Point:
Per Module:
2 Amps
2 Amps
Agency Certifications UL Classified: Under UL File Number E113724
CSA
CE: compliant for all applicable directives
Pollution Degree 2
Environmental Rating IP20
Refer to the Wiring Diagram(s) for
current limits for a specific configuration.
NOTICE
Table 2: Bulletin 1771 to 1756 Conversion Modules and Cables
1771
Digital I/O Module
1756
Digital I/O Module
1492
Conversion Module
1492
Cable
1771-IAD 1756-IA16 1492-CM1771-LD001 1492-CONCAB005X
1771-IBD 1756-IB16 1492-CM1771-LD001 1492-CONCAB005X
1771-ICD 1756-IC16 1492-CM1771-LD001 1492-CONCAB005X
1771-IND 1756-IN16 1492-CM1771-LD001 1492-CONCAB005X
1771-IND1 1756-IN16 1492-CM1771-LD001 1492-CONCAB005X
(4)
PN-114270
DIR 10000060084 (Version 01)
Publication 1492-IN035B-EN-E
Conversion Module Installation and Application Considerations
This Bul. 1492 cable consists of a cable wired to one 1756-IA16 RTB. Recommended cable lengths of 0.5M or 1.0M
(005=0.5M, 010=1.0M). See table 2 for other lengths.
The input delay times for the 1771-IAD module versus the 1756-IA16 module are as follows:
1771-IAD 1756-IA16 w/ 1492-CONCAB005X
a) Off-to-On Delay 5ms (+/-3ms) @120VAC 10ms max (plus selectable filter)
b) On-to-Off Delay 25ms (+/-5ms) 8ms max (plus selectable filter)
The 1771-IAD module is rated 79V to 138V AC or DC. The 1756-IA16 module is rated 74V to 132V AC. If the input
source voltage is DC use a 1756-IH16l and 1492-CM1771-LD002 conversion module.
Refer to your 1771-IAD and 1756-IA16 Installation Manual wiring schematics and diagrams for more details.
[Reference Doc: 41170-925 (Version 02)]
10 L2-0
IN-0
1
IN-1
2
IN-2
3
IN-3
4
IN-4
5
IN-5
6
IN-6
7
IN-7
8
IN-8
11
IN-9
12
IN-10
13
IN-11
14
IN-12
15
IN-13
16
IN-14
17
IN-15
18
Black
White
Red
Green
Orange
Blue
White/Black
Red/Black
Green/Black
Orange/Black
Blue/Black
Black/White
Red/White
Green/White
Blue/White
Black/Red
White/Red
Orange/Red
Blue/Red
Red/Green L2-1
20
9 L2-0
19 L2-1
A
1
00
19
01
3
02
4
03
5
04
6
05
7
06
8
07
9
E
10
1110
1211
1312
13
1514
1615
1716
17 18
20
14
2
Input 14
Input 16
Input 15
Input 17
Input 04
Input 06
Input 05
Input 07
Input 00
Input 02
Input 01
Input 03
Input 10
Input 12
Input 11
Input 13
Terminal A
Terminal E
B
C
D
Terminal B
Terminal C
Terminal D
L1
L2
24
21
22
23
25
1756-IA16
1771-WH Swing Arm
From 1771-IAD
V. Wiring Diagrams
There are several key application considerations and system specifications (bottom of drawing) when
using these components (conversion module, cable and input module). Read and understand these
considerations before installation.
WARNING
Conversion: 1771-IAD to 1756-IA16
Conversion Module
1492-CM1771-LD001
Cable
1492-CONCAB005X
PN-114270
DIR 10000060084 (Version 01)
Publication 1492-IN035B-EN-E
Conversion Module Installation and Application Considerations
This Bul. 1492 cable consists of a cable wired to one 1756-IA16 RTB. Recommended cable lengths of 0.5M or 1.0M
(005=0.5M, 010=1.0M). See table 2 for other lengths.
The input delay times for the 1771-IAD module versus the 1756-IA16 module are as follows:
1771-IAD 1756-IA16 w/ 1492-CONCAB005X
a) Off-to-On Delay 5ms (+/-3ms) @120VAC 10ms max (plus selectable filter)
b) On-to-Off Delay 25ms (+/-5ms) 8ms max (plus selectable filter)
The 1771-IAD module is rated 79V to 138V AC or DC. The 1756-IA16 module is rated 74V to 132V AC. If the input
source voltage is DC use a 1756-IH16l and 1492-CM1771-LD002 conversion module.
Refer to your 1771-IAD and 1756-IA16 Installation Manual wiring schematics and diagrams for more details.
[Reference Doc: 41170-925 (Version 02)]
10 L2-0
IN-0
1
IN-1
2
IN-2
3
IN-3
4
IN-4
5
IN-5
6
IN-6
7
IN-7
8
IN-8
11
IN-9
12
IN-10
13
IN-11
14
IN-12
15
IN-13
16
IN-14
17
IN-15
18
Black
White
Red
Green
Orange
Blue
White/Black
Red/Black
Green/Black
Orange/Black
Blue/Black
Black/White
Red/White
Green/White
Blue/White
Black/Red
White/Red
Orange/Red
Blue/Red
Red/Green L2-1
20
9 L2-0
19 L2-1
A
1
00
19
01
3
02
4
03
5
04
6
05
7
06
8
07
9
E
10
1110
1211
1312
13
1514
1615
1716
17 18
20
14
2
Input 14
Input 16
Input 15
Input 17
Input 04
Input 06
Input 05
Input 07
Input 00
Input 02
Input 01
Input 03
Input 10
Input 12
Input 11
Input 13
Terminal A
Terminal E
B
C
D
Terminal B
Terminal C
Terminal D
L1
L2
24
21
22
23
25
1756-IA16
1771-WH Swing Arm
From 1771-IAD
V. Wiring Diagrams
There are several key application considerations and system specifications (bottom of drawing) when
using these components (conversion module, cable and input module). Read and understand these
considerations before installation.
WARNING
Conversion: 1771-IAD to 1756-IA16
Conversion Module
1492-CM1771-LD001
Cable
1492-CONCAB005X
5
6
7
8
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Key Features
- Converts 1771 I/O to 1756
- No field wire removal
- Easy mounting
- Compatible with various modules
- Multiple cable lengths
Related manuals
Frequently Answers and Questions
What types of 1771 I/O modules are compatible with this conversion module?
The 1492-CM1771-LD001 conversion module is compatible with various Bulletin 1771 digital I/O modules, including 1771-IAD, 1771-IBD, 1771-ICD, 1771-IND, and 1771-IND1. You can find a complete list of compatible modules in Table 2 of the viewed document.
How do I determine the required cable length for my conversion?
The standard cable length is 0.5M (1492-CONCAB005X). You can also choose a 1.0M cable (1492-CONCAB010X). Refer to the footnotes in Table 2 of the viewed document for more details.
How many conversion modules can I install in a 1492 Conversion Mounting Assembly?
The maximum number of Conversion Modules you can install in a 1492 Conversion Mounting Assembly depends on the specific Assembly model. The table in Section II of the viewed document shows the maximum number of Conversion Module slots for each model.
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