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1791-16AO

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The Allen-Bradley 1791-16AO discrete I/O module belongs to the small, stand-alone distributed I/O product family.
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Technical specifications for 1791-16AO

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1791-16AO
  • Product Family:
    1791 Block I/O
  • Inputs per Block:
    16 (2 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:
    5mA @ 79V, 60Hz
  • Off-state Current Minimum:
    2.3mA (60Hz)
  • Input Impedance Maximum:
    15K ohms @ 60Hz
  • Weight:
    0.54 kg
  • Estimated shipping dimensions:
    17.8x8.2x9.5cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Applications Operating Environment Certifications & Standards

Features:

  • Interface Between 120VAC Input Devices and Distributed Control Networks
  • Integrates Sixteen Discrete AC Inputs with Built-In Power Supply and PLC Communication
  • Functions Seamlessly with Proximity Switches, Limit Switches, and Discrete Operating Devices
The Allen-Bradley 1791-16AO operates as a compact, self-contained Distributed I/O block designed to streamline input acquisition in industrial automation environments. This 1791-16AO module continuously accepts sixteen 120VAC discrete inputs and transmits corresponding data asynchronously to the host controller via daisy-chain network configuration. Built-in integration of the I/O rack, adapter, power supply, and input circuitry eliminates the need for separate component assembly, reducing installation complexity and panel space requirements. The 1791-16AO supports direct connection to proximity switches, limit switches, selector switches, float switches, pushbutton switches, and auxiliary contacts, providing versatile signal acquisition capabilities for diverse machine control applications.

The 1791-16AO delivers essential input processing functions within the Block I/O architecture and serves as a critical data acquisition node, directly influencing the accuracy and responsiveness of the overall control system. Each 1791-16AO module occupies a compact footprint suitable for horizontal or vertical mounting configurations, with a maximum output rating of 600mA at both 30°C and 60°C ambient temperatures. The 1791-16AO also accommodates surge currents up to 10A for 50ms, repeatable every 2 seconds, ensuring reliable operation during transient electrical events.

For system compatibility, the 1791-16AO supports integration with select 1771 series output modules including the 1771-OAN, 1771-OD16, 1771-ODD, and 1771-ODZ, provided the off-state leakage current remains below the 1791-16AO minimum OFF-state current threshold and the supply voltage minus the 1771 module on-state voltage drop does not exceed the 1791-16AO minimum ON-state voltage requirement. When installing the 1791-16AO, maintaining a 2-inch (58.0 cm) clearance on all sides ensures adequate airflow for thermal management and sustained operational reliability.

The 1791-16AO Allen-Bradley 16 Input AC Block I/O Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen-Bradley 1791-16AO 16 Input AC Block I/O Module Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Allen-Bradley 1791-16AO 16 Input AC Block I/O Module Specs

General

  • Manufacturer Allen-Bradley
  • Model 1791-16AO
  • Condition New Original ready stock
  • Product Family 1791-16BC,1791-16BO
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Material Handling & Packaging: Efficiently monitoring high volumes of sensors in conveyor or sorting systems.
  • Operator Interface Panels: Managing inputs from control panels located at a distance from the main processor.
  • Field Device Monitoring: Compatible with various discrete field instruments: Pushbutton and selector switches,Limit and proximity switches,Float switches and auxiliary contacts.
  • Operating Temperature: Must not exceed 60°C (140°F) in the air gap directly below the module.
  • Thermal Dissipation: Maximum heat output is approximately 77.6 BTU/hr.
  • Airflow Requirements: Requires a minimum 2.0-inch (50.8 mm) air gap on all four sides to ensure adequate cooling.
  • Mounting Flexibility: Can be mounted vertically (recommended) or horizontally on a panel or DIN rail.
  • Hazardous Locations: Some models in the series are UL certified for use in Class I, Div. 2, Groups A, B, C, and D hazardous environments.
  • Safety Standards: Adheres to ANSI/ISA-12.12.01 and C22.2 No. 213-M1987 for non-incendive electrical equipment.
  • Manufacturing Quality: Often found through vendors with ISO 9001:2015 certification for testing and refurbishing surplus units.
Description
The Allen-Bradley 1791-16AO is a Discrete I/O block that belongs to the small, self-contained Distributed I/O products. This device has embedded Sixteen (16) 120VAC inputs, including power supply and Programmable Logic Controller (PLC) interface.

The Block I/O family, including the 1791-16AO has built-in functionalities such as and I/O rack, an adapter, power supply, input and output device. Block I/Os are installed in daisy-chain configuration to a scanner in the network, particularly a controller. Input and outputs are asynchronously scanned and transferred to and from the block I/O and the controller.

The 1791-16AO supports integration of proximity switches, limit switches, selector switches, float switches, pushbutton switches, auxilliary contacts and other discrete operating devices.

The 1791-16AO is compatible for use with 1771 series output modules provided that the off-state leakage current of the module is less than the minimum OFF-state current of the Block I/O. Additionally, the minimum ON-state voltage of the bock I/O must be higher that the supply voltage, less the on-state voltage drop across the 1771 output module. A number of modules that meet the compatibility requirement includes the 1771-OAN, 1771-OD16, 1771-ODD, 1771-ODZ and some other modules.

The 1791-16AO supports Horizontal or Vertical mounting, with maximum output rating of 600mA at 30 Degree Celsius and 60 Degree Celsius with maximum surge current of 10A for 50ms that is repeatable for every 2 seconds. When installing the block I/O, the recommended clearance to allow adequate air flow for ventiallation is 2 inches or 58.0 cm on all side of the module.
Revisions

Revision Part #

Also known as

1791-16AO Ser A
1791-16AO/A, Series A, Rev A
1791-16AO Ser B
1791-16AO/B, Series B, Rev B
Alternative Names
1791-16A0 1791-16BC 1791-16BO 1791-I6AO I791-16AO
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What is the 1791-16AO module?
The 1791-16AO is a Discrete Block I/O module from Allen-Bradley, designed as a compact and self-contained distributed I/O solution for industrial automation systems.
How does the 1791-16AO communicate within a control system?
It is connected in a daisy-chain configuration to a network scanner or controller, where input and output data are asynchronously scanned and exchanged between the module and the PLC.
What types of devices can be connected to the 1791-16AO?
The module supports a variety of discrete input devices such as proximity switches, limit switches, selector switches, float switches, pushbuttons, and auxiliary contacts.