Allen-Bradley 1794-IA8/A
Allen-Bradley 1794-IA8/A
Allen-Bradley 1794-IA8/A
Allen-Bradley 1794-IA8/A
Allen-Bradley 1794-IA8/A
Allen-Bradley 1794-IA8/A
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1794-IA8/A

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The Allen-Bradley 1794-IA8/A is a FLEX 120V AC digital I/O module designed specifically for industrial automation applications.
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Technical specifications for 1794-IA8/A

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1794-IA8/A
  • Product Family:
    Flex I/O
  • Power Dissipation:
    Maximum 3.5W @ 132V ac
  • Thermal Dissipation:
    Maximum 11.9 BTU/hr @ 132V ac
  • Indicators (field side indication, customer device driven):
    8 yellow status indicators
  • Keyswitch Position:
    8
  • Flexbus Current (maximum):
    30mA
  • Weight:
    0.1 kg
  • Estimated shipping dimensions:
    9.3x5x5.5cm
  • 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 Use Cases Installation & Integration Monitoring & Control

Features:

  • Interface Between 120V AC Field Signals and FLEX I/O Backplane
  • Combines Capability of AC Signal Conversion with Flexible Mounting Options
  • Operates in Conjunction with the FLEX I/O System and Various Terminal Base Units
The Allen-Bradley 1794-IA8/A operates as the 120V AC Input Module in a FLEX I/O system, providing reliable digital input conversion for industrial control applications. It continuously converts incoming AC signals (85-132 VAC, 47-63 Hz) to appropriate logic levels and transmits these signals through the FlexBus to support steady state operation of the processor and I/O modules. Seamless integration is standard with the 1794-IA8/A, however using various compatible terminal base units will allow flexible configuration options to meet specific application requirements. The 1794-IA8/A features 8 non-isolated inputs with yellow status indicators in addition to supporting multiple communication protocols within the FLEX I/O architecture.

The 1794-IA8/A provides essential input functions common to the entire control system, and is a critical component of the signal acquisition path, directly affecting the proper, normal operation of the overall monitoring and control system. One 1794-IA8/A module is required per 8-point input configuration depending on the desired I/O density.

For expanded I/O applications, the FLEX I/O System allows multiple 1794-IA8/A input modules to be installed alongside other FLEX I/O modules. In addition to standard single module operation, the flexible configuration also performs automatic signal processing. The 1794-IA8/A module executes input conversion using the internal circuitry specified in the module specifications. Using this method, the input module continually monitors the status of all 8 input channels. If the system detects that an input signal transitions from OFF to ON (within the 8.4 millisecond filter time) or ON to OFF (within the 26.4 millisecond filter time), it will automatically update the processor status and provide visual indication through the yellow status LEDs.

The 1794-IA8/A Allen-Bradley 120V ac Input Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen-Bradley 1794-IA8/A 120V ac Input 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 1794-IA8/A 120V ac Input Module Specs

General

  • Manufacturer Allen-Bradley
  • Model 1794-IA8/A
  • Condition New Original ready stock
  • Product Family 1794-IA8I,1794-IA8K,1794-IE8,1794-IR8
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.
  • Discrete Signal Monitoring: Detecting ON/OFF states from field devices like limit switches, push buttons, and proximity sensors.
  • Industrial Automation: Suitable for production optimization and digital operations in harsh industrial environments.
  • Modular Expansion: Used in systems requiring flexible scaling without the large footprint of traditional rack-based I/O.
  • Terminal Base Compatibility: Compatible with several bases including 1794-TB3 (3-wire), 1794-TB2 (2-wire), and 1794-TBN.
  • Mounting: Modules mount on a 35mm DIN rail or can be panel-mounted via the terminal base.
  • Keying: An adjustable keyswitch on the terminal base must be set to position 8 to prevent incorrect module insertion.
  • Daisy-Chaining: Power connections (L1 and L2) can be daisy-chained across adjacent terminal bases to simplify wiring.
  • Signal Detection: Operates within a voltage range of 65–132V AC at 47–63 Hz.
  • Input Response: Converts incoming 120V AC signals to binary data; the PLC ladder program uses instructions like Block Transfer Read (BTR) to retrieve these values.
  • System Integrity: Features 2150V DC isolation between field signals and the system backplane (FlexBus) to protect sensitive control electronics.
  • Hot-Swapping: Allows for removal and insertion of modules under power (RIUP) without disturbing other modules or system operations.
Description
The Allen-Bradley 1794-IA8/A is a FLEX 120 Volts AC Digital I/O module designed for industrial automation applications. This 1794-IA8/A module features 8 non-isolated inputs and converts AC signals to the appropriate logic level for use within the processor. The 1794-IA8/A comes equipped with 8 yellow status indicators and offers flexible mounting options, including DIN rail or panel mount configurations. 

This 1794-IA8/A module operates with a voltage range of 85 to 132 Volts AC at 47 to 63 Hertz. The 1794-IA8/A features a minimum on-state voltage of 65 Volts AC, a nominal voltage of 120 Volts AC, a maximum on-state voltage of 132 Volts AC, and an off-state voltage of 43 Volts AC. The nominal current for the 1794-IA8/A is 12 mA at 120 Volts AC, 60 Hertz. 

The 1794-IA8/A provides an isolation voltage of 2150 Volts DC for 1 second between the system and the user, with a FlexBus current of 30 mA at 5 Volts DC and a bus rating of 30 mA at 5 Volts DC. Power dissipation for the 1794-IA8/A reaches a maximum of 4.5 W at 132 Volts AC, with thermal dissipation of 15.3 BTU/hour. The default filter time for the 1794-IA8/A from OFF to ON is 8.4 milliseconds and 26.4 milliseconds from ON to OFF.

This 1794-IA8/A module is specifically designed for handling AC input signal acquisition in manufacturing environments, solving the challenge of reliable 120V AC digital input monitoring in applications such as conveyor system status detection, motor starter feedback, limit switch monitoring, and pushbutton or selector switch interfaces. The 1794-IA8/A effectively addresses the need for robust, high-density AC input modules in distributed I/O architectures, providing reliable signal conversion and status indication for industrial control systems.
Revisions

Revision Part #

Also known as

1794-IA8 Ser A
1794-IA8/A, Series A, Rev A
Alternative Names
1794-IA8 1794-IA8I 1794-IA8K 1794-IE8 1794-IR8
Technical notes
Allen-Bradley 1794-IA8/A module draws a nominal current of 12 mA at 120V AC and has a maximum power dissipation of 4.5 W. It also provides 2150V DC isolation between the user and system for enhanced safety.
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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 mechanical durability does the 1794-IA8/A provide?
The module withstands vibration up to 5g (10–500 Hz), operating shock up to 30g, and non-operating shock up to 50g, ensuring reliable performance in demanding environments.
In what environments can the 1794-IA8/A operate reliably?
It is designed for harsh industrial conditions, with an operating temperature range of -20°C to 55°C and humidity tolerance of 5% to 95% non-condensing.
What are the response times of the 1794-IA8/A?
The module features default filter times of 8.4 milliseconds for OFF-to-ON transitions and 26.4 milliseconds for ON-to-OFF transitions, balancing responsiveness and noise immunity.

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