Allen-Bradley 1492 Analog I/O Conversion Module Installation Instructions
Allen-Bradley 1492 Analog I/O Conversion Module is a device designed to convert signals between Allen-Bradley 1771 and 1756 I/O modules. It enables the seamless integration of existing 1771 I/O systems into a 1756 ControlLogix environment. This conversion module simplifies the upgrade process, minimizes downtime, and allows you to utilize the advanced features of the ControlLogix platform.
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Analog I/O Conversion Module (Cat 1492-CM1771-LA001) I. Description This Analog I/O Conversion Module provides for the conversion of (1) 1771, 16 Channel I/O module to be converted to (1) 1756, 16 Channel I/O module and consists of the following: (1) 1771 Module (16ch) to (1) 1756 Module (16ch) (2) Conversion Module: 1492-CM1771-LA001 (1) Cable: 1492-CONACAB005A or 1492-CONACAB005B (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 for further details. Conversion Compatibility and Product I.D. Label 25-Pin Connector for cable 1492-CONACAB005A OR -CONACAB005B 1492-CM1771-LA001 Conversion Module WARNING PN-114287 DIR 10000060098 (Version 01) Publication 1492-IN045B-EN-E Printed in U.S.A. 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. 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. Table 1: Bulletin 1771 to 1756 Chassis Conversion 1771 Chassis Cat. No. Max Slots for I/O 1771-A1B 4 1756 Chassis Chassis Width without Power Supply with Power Supply 9.01 12.61 14.01 17.61 Conversion Mounting Assembly Cat. No. Max Slots for I/O Chassis Width Cat. No. Max Slots for Conversion Modules Chassis Width 1492-MUA1B-A4-A7 4 9.01 1756-A4 3 10.35 1756-A7 6 14.49 1756-A7 1756-A10 6 9 14.49 19.02 1492-MUA2B-A7-A10 8 14.01 1771-A2B 8 1771-A3B1 12 19.01 1756-A10 1756-A13 9 12 19.02 23.15 1492-MUA3-A10-A13 12 19.01 1771-A4B 16 24.01 1756-A13 1756-A17 12 16 23.15 29.06 1492-MUA4-A13-A17 16 24.01 Foot Notes: 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-114287 DIR 10000060098 (Version 01) Publication 1492-IN045B-EN-E (2) III. Compatibility 1771 Analog I/O Module 1771-IFE (SEC) 1771-IFE (SEV) 1756 Analog I/O Module 1771-IF16 (SEC) 1771-IF16 (SEV) 1492 I/O Conversion Module 1492-CM1771-LA001 1492-CM1771-LA001 1492 Cable 1492-CONACAB005B 1492-CONACAB005A 1771-IFF (SEC) 1771-IFF (SEV) 1771-IF16 (SEC) 1771-IF16 (SEV) 1492-CM1771-LA001 1492-CM1771-LA001 1492-CONACAB005B 1492-CONACAB005A 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 length of the 1492 Cable. Recommended cable lengths of 0.5M are shown. Additional cable lengths are as follows: 1.0M = 1492-CONACAB010A 1.0M = 1492-CONACAB010B IV. Conversion Module Specifications (Operating specifications are when installed in the Conversion System base / cover-plate assembly) Specification Dimensions Approximate Shipping Weight Storage Temperature Operating Temperature Operating Humidity Shock Non operating Operating Operating Vibration Maximum Operating Voltage Max. Module Operating Current Per Point: Per Module: Value 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) 250.6 g (0.55 lbs) (includes carton) -40 to +85°C (-40 to +185°F) 0 to 60°C (32 to 140°F) 5 to 95% at 60°C (non-condensing) 50g 30g 2g at 10 to 500Hz (Agrees with 1756 I/O module specifications) 30 Vdc 2 Amps 12 Amps NOTICE Refer to the Wiring Diagram(s) for current limits for a specific configuration. Agency Certifications UL Classified: Under UL File Number E113724 CSA CE: compliant for all applicable directives Pollution Degree 2 Environmental Rating IP20 PN-114287 DIR 10000060098 (Version 01) Publication 1492-IN045B-EN-E (3) Conversion: 1771-IFE to 1756-IF16 (Single-ended Current) 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 Module 1492-CM1771-LA001 2-Wire Transmitter + Power Supply - Transmitter Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 Channel 7 Channel 8 Module Common Module Common Module Common Module Common Module Common Channel 9 Channel 10 Channel 11 Channel 12 Channel 13 Channel 14 Channel 15 Channel 16 1 2 3 4 6 7 8 9 5 10 15 20 21 11 12 13 14 16 17 18 19 Cable 1492-CONACAB005B 1 2 3 4 5 6 7 8 9 10 11 12 13 Black Black/White 28 14 15 16 17 18 19 20 21 22 23 24 25 Green/White 20 22 24 26 30 32 34 36 White Red Green Orange Blue White/Black Red/Black Green/Black 2 4 6 8 12 14 16 18 10 Orange/Black IN-0 IN-1 IN-2 IN-3 IN-4 IN-5 IN-6 IN-7 RTN Blue/Black Blue/White Black/Red White/Red Orange/Red Blue/Red Red/Green Orange/Green SH 1771-WG Swing Arm From 1771-IFE 1756-IF16 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 RTN IN-8 IN-9 IN-10 IN-11 IN-12 IN-13 IN-14 IN-15 iRTN-0 iRTN-1 iRTN-2 iRTN-3 RTN iRTN-4 iRTN-5 iRTN-6 iRTN-7 iRTN-8 iRTN-9 iRTN-10 iRTN-11 RTN iRTN-12 iRTN-13 iRTN-14 iRTN-15 Conversion Module Installation and Application Considerations This Bul. 1492 cable consists of a cable wired to one 1756-IF16 RTB. Recommended cable lengths of 0.5M or 1.0M (005=0.5M, 010=1.0M). See table 2 for other lengths. SHIELD GROUNDING: In some installations, the field wiring shield was grounded on the 1771 chassis. If this was the case, the installer must remove these shield connections from the 1771 chassis and they can be connected to the grounding stud on the 1492-CM1771-LA001 module. The pre-wired cable used between the 1492-CM1771-LA001 module and the 1756-IF16 [1492-CONACAB005B] provides a shield ground lug to ground the shield at the 1756 ControlLogix chassis, this must be connected. Do NOT connect this ground lug to the conversion module grounding stud. This design assumes that all inputs on the1771-IFE were connected to current transmitters. If there was a mix of current and voltage transmitters, then modification of the pre-wired cable [1492-CONACAB005B] will need to occur at the 1756-IF16 terminal block. Refer to the 1756-IF16 Installation Manual for modification details. The 1771-IFE analog input ranges were configured via software, as is the input range for the 1756-IF16. Please ensure the correct input range is configured in the 1756-IF16. Refer to your 1771-IFE and 1756-IF16 Installation and User Manuals for additional information concerning comparisons of module wiring, features and configuration details. PN-114287 DIR 10000060098 (Version 01) Publication 1492-IN045B-EN-E [Reference Doc: 41170-944 (Version 02)] (4) Conversion: 1771-IFE to 1756-IF16 (Single-ended Voltage) V. Wiring Diagrams (Cont’d) 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 Module 1492-CM1771-LA001 Cable 1492-CONACAB005A 3-Wire Transmitter Transmitter + Power Supply Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 Channel 7 Channel 8 Module Common Module Common Module Common Module Common Module Common Channel 9 Channel 10 Channel 11 Channel 12 Channel 13 Channel 14 Channel 15 Channel 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 1 2 3 4 6 7 8 9 5 10 15 20 21 11 12 13 14 16 17 18 19 Black White Red Green Orange Blue White/Black Red/Black Green/Black Orange/Black Blue/Black Black/White Green/White Blue/White Black/Red White/Red Orange/Red Blue/Red Red/Green Orange/Green 1756-IF16 2 4 6 8 12 14 16 18 10 9 27 28 20 22 24 26 30 32 34 36 IN-0 IN-1 IN-2 IN-3 IN-4 IN-5 IN-6 IN-7 RTN RTN RTN RTN IN-8 IN-9 IN-10 IN-11 IN-12 IN-13 IN-14 IN-15 SH 1771-WG Swing Arm From 1771-IFE Conversion Module Installation and Application Considerations This Bul. 1492 cable consists of a cable wired to one 1756-IF16 RTB. Recommended cable lengths of 0.5M or 1.0M (005=0.5M, 010=1.0M). See table 2 for other lengths. SHIELD GROUNDING: In some installations, the field wiring shield was grounded on the 1771 chassis. If this was the case, the installer must remove these shield connections from the 1771 chassis and they can be connected to the grounding stud on the 1492-CM1771-LA001 module. The pre-wired cable used between the 1492-CM1771-LA001 module and the 1756-IF16 [1492-CONACAB005A] provides a shield ground lug to ground the shield at the 1756 ControlLogix chassis, this must be connected. Do NOT connect this ground lug to the conversion module grounding stud. This design assumes that all inputs on the1771-IFE were connected to current transmitters. If there was a mix of current and voltage transmitters, then modification of the pre-wired cable [1492-CONACAB005A] will need to occur at the 1756-IF16 terminal block. Refer to the 1756-IF16 Installation Manual for modification details. The 1771-IFE analog input ranges were configured via software, as is the input range for the 1756-IF16. Please ensure the correct input range is configured in the 1756-IF16. Refer to your 1771-IFE and 1756-IF16 Installation and User Manuals for additional information concerning comparisons of module wiring, features and configuration details. PN-114287 DIR 10000060098 (Version 01) Publication 1492-IN045B-EN-E [Reference Doc: 41170-945 (Version 02)] (5) Conversion: 1771-IFF to 1756-IF16 (Single-ended Current) V. Wiring Diagrams WARNING 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. Conversion Module 1492-CM1771-LA001 2-Wire Transmitter + Power Supply - Transmitter Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 Channel 7 Channel 8 Module Common Module Common Module Common Module Common Module Common 1 2 3 4 6 7 8 9 5 10 15 20 21 Channel 9 Channel 10 Channel 11 Channel 12 Channel 13 Channel 14 Channel 15 Channel 16 11 12 13 14 16 17 18 19 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Cable 1492-CONACAB005B Black White Red Green Orange Blue White/Black Red/Black Green/Black 2 4 6 8 12 14 16 18 10 Orange/Black IN-0 IN-1 IN-2 IN-3 IN-4 IN-5 IN-6 IN-7 RTN Blue/Black Black/White 28 Green/White 20 22 24 26 30 32 34 36 Blue/White Black/Red White/Red Orange/Red Blue/Red Red/Green Orange/Green SH 1771-WG Swing Arm From 1771-IFF 1756-IF16 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 RTN IN-8 IN-9 IN-10 IN-11 IN-12 IN-13 IN-14 IN-15 iRTN-0 iRTN-1 iRTN-2 iRTN-3 RTN iRTN-4 iRTN-5 iRTN-6 iRTN-7 iRTN-8 iRTN-9 iRTN-10 iRTN-11 RTN iRTN-12 iRTN-13 iRTN-14 iRTN-15 Conversion Module Installation and Application Considerations This Bul. 1492 cable consists of a cable wired to one 1756-IF16 RTB. Recommended cable lengths of 0.5M or 1.0M (005=0.5M, 010=1.0M). See table 2 for other lengths. SHIELD GROUNDING: In some installations, the field wiring shield was grounded on the 1771 chassis. If this was the case, the installer must remove these shield connections from the 1771 chassis and they can be connected to the grounding stud on the 1492-CM1771-LA001 module. The pre-wired cable used between the 1492-CM1771-LA001 module and the 1756-IF16 [1492-CONACAB005B] provides a shield ground lug to ground the shield at the 1756 ControlLogix chassis, this must be connected. Do NOT connect this ground lug to the conversion module grounding stud. This design assumes that all inputs on the 1771-IFF were connected to current transmitters. If there was a mix of current and voltage transmitters, then modification of the pre-wired cable [1492-CONACAB005B] will need to occur at the 1756-IF16 terminal block. Refer to the 1756-IF16 Installation Manual for modification details. The 1771-IFF analog input ranges were configured via software, as is the input range for the 1756-IF16. Please ensure the correct input range is configured in the 1756-IF16. Refer to your 1771-IFF and 1756-IF16 Installation and User Manuals for additional information concerning comparisons of module wiring, features and configuration details. PN-114287 DIR 10000060098 (Version 01) Publication 1492-IN045B-EN-E [Reference Doc: 41171-023 (Version 00)] (6) V. Wiring Diagrams (Cont’d) WARNING Conversion: 1771-IFF to 1756-IF16 (Single-ended Voltage) 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. Conversion Module 1492-CM1771-LA001 Cable 1492-CONACAB005A 3-Wire Transmitter Transmitter + Power Supply Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 Channel 7 Channel 8 Module Common Module Common Module Common Module Common Module Common Channel 9 Channel 10 Channel 11 Channel 12 Channel 13 Channel 14 Channel 15 Channel 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 1 2 3 4 6 7 8 9 5 10 15 20 21 11 12 13 14 16 17 18 19 1756-IF16 2 4 6 8 12 14 16 18 10 9 27 28 Black White Red Green Orange Blue White/Black Red/Black Green/Black Orange/Black Blue/Black Black/White 20 22 24 26 30 32 34 36 Green/White Blue/White Black/Red White/Red Orange/Red Blue/Red Red/Green Orange/Green IN-0 IN-1 IN-2 IN-3 IN-4 IN-5 IN-6 IN-7 RTN RTN RTN RTN IN-8 IN-9 IN-10 IN-11 IN-12 IN-13 IN-14 IN-15 SH 1771-WG Swing Arm From 1771-IFF Conversion Module Installation and Application Considerations This Bul. 1492 cable consists of a cable wired to one 1756-IF16 RTB. Recommended cable lengths of 0.5M or 1.0M (005=0.5M, 010=1.0M). See table 2 for other lengths. SHIELD GROUNDING: In some installations, the field wiring shield was grounded on the 1771 chassis. If this was the case, the installer must remove these shield connections from the 1771 chassis and they can be connected to the grounding stud on the 1492-CM1771-LA001 module. The pre-wired cable used between the 1492-CM1771-LA001 module and the 1756-IF16 [1492-CONACAB005A] provides a shield ground lug to ground the shield at the 1756 ControlLogix chassis, this must be connected. Do NOT connect this ground lug to the conversion module grounding stud. This design assumes that all inputs on the1771-IFF were connected to voltage transmitters. If there was a mix of current and voltage transmitters, then modification of the pre-wired cable [1492-CONACAB005A] will need to occur at the 1756-IF16 terminal block. Refer to the 1756-IF16 Installation Manual for modification details. The 1771-IFF analog input ranges were configured via software, as is the input range for the 1756-IF16. Please ensure the correct input range is configured in the 1756-IF16. Refer to your 1771-IFF and 1756-IF16 Installation and User Manuals for additional information concerning comparisons of module wiring, features and configuration details. PN-114287 DIR 10000060098 (Version 01) Publication 1492-IN045B-EN-E [Reference Doc: 41171-024 (Version 00)] (7) PN-114287 DIR 10000060098 (Version 01) Publication 1492-IN045B-EN-E Printed in U.S.A. ">

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Key features
- 1771 to 1756 conversion
- 16-channel support
- Swing Arm compatibility
- Modular design
- System installation manual
- Wiring diagram
- UL, CSA & CE certified
Frequently asked questions
The 1492 Conversion Module allows you to convert signals from Allen-Bradley 1771 I/O modules to 1756 ControlLogix I/O modules without removing field wires. It provides a connection point for the 1771 swing arm and routes signals through the conversion module and cable to the 1756 I/O module.
There are two types of 1492 cables offering different lengths: 1492-CONACAB005A (0.5M) and 1492-CONACAB005B (1.0M). The cable length is denoted by the last two digits (005 = 0.5M, 010 = 1.0M).
The appropriate Conversion Mounting Assembly is selected based on the number of 1771 and 1756 modules you plan to convert. Refer to Table 1 in the manual to determine the required number of slots for conversion modules and I/O modules.