Allen-Bradley 1794-OB16PXT
Allen-Bradley 1794-OB16PXT
Allen-Bradley 1794-OB16PXT
Allen-Bradley 1794-OB16PXT
Allen-Bradley 1794-OB16PXT
Allen-Bradley 1794-OB16PXT
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1794-OB16PXT

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1794-OB16PXT is an Allen-Bradley FLEX I/O-XT digital DC output module with 16 sourcing outputs, 10-31.2V DC operation, 2A per point, and -20…+70°C XT extended temperature range.
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Technical specifications for 1794-OB16PXT

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1794-OB16PXT
  • Product Family:
    Flex I/O
  • Product Type:
    Digital DC Output Module
  • Number of Outputs:
    16 sourcing (positive logic)
  • Output Voltage Range:
    10-31.2V DC
  • Maximum Current per Point:
    2A
  • Pilot Duty Rating:
    2A
  • Power Dissipation (max):
    6.0W @ 31.2V DC
  • Thermal Dissipation (max):
    20.3 BTU/hr @ 31.2V DC
  • Status Indicators:
    16 yellow (field side, logic driven)
  • Keyswitch Position:
    2
  • Operating Temperature:
    -20°C to +70°C (-4°F to +158°F)
  • Storage Temperature:
    -40°C to +85°C (-40°F to +185°F)
  • Relative Humidity:
    5-95% noncondensing
  • Vibration:
    5g @ 10-500 Hz
  • Weight:
    0.6 kg
  • Estimated shipping dimensions:
    3x15.2x26cm
  • Tariff Code:
    8517795000
  • 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 Application Diagnostics & Safety Upgrade Guide

Features:

  • Operates from -20°C to +70°C (-4°F to +158°F) with storage down to -40°C, enabling deployment in refrigerated warehouses, outdoor skids, and high-temperature industrial environments where standard modules fail.
  • Provides 16 sourcing (positive logic) DC outputs rated at 2A per point, 10-31.2V DC operation, with pilot duty rating of 2A for controlling solenoids, relays, contactors, and indicator lights.
  • Withstands 30g operating shock, 5g vibration (10-500 Hz), and 95% humidity.
The 1794-OB16PXT is specifically engineered for applications where standard industrial electronics cannot survive due to temperature extremes. The XT (Extreme Temperature) designation indicates this module has been qualified for operation from -20°C to +70°C (-4°F to +158°F), significantly wider than standard FLEX I/O modules (typically 0°C to +55°C). This extended temperature range enables deployment in refrigerated warehouses (operating below freezing), outdoor control cabinets in arctic climates, uninsulated industrial buildings, desert solar installations with high daytime temperatures, and cold storage facilities.

The 1794-OB16PXT provides 16 sourcing (positive logic) DC outputs, meaning the module supplies positive voltage to the load when the output is energized. This configuration is common in North American industrial control systems where field devices are wired with a common DC ground. Each output is rated for 2A continuous current at 10-31.2V DC, allowing direct control of solenoids, small motors, indicator lights, and relay coils without external interposing relays. The module also carries a pilot duty rating of 2A, indicating it can handle the high inrush currents associated with pilot devices such as contactors and solenoid valves.

The 1794-OB16PXT is built to withstand the mechanical and electrical stresses common in industrial environments. For mechanical robustness, it withstands 30g operating shock (IEC 60068-2-27) and 5g vibration at 10-500 Hz (IEC 60068-2-6), ensuring reliable operation even when mounted on vibrating machinery or near stamping presses. Non-operating shock tolerance of 50g protects the module during shipping and handling. The module operates in 5-95% noncondensing humidity (IEC 60068-2-30), suitable for washdown areas and humid climates.

The 1794-OB16PXT Allen-Bradley Digital DC Output Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).

Bently Nevada Bently Nevada 130539-35 Standard Accelerometer Interconnect Cable Manuals, Datasheets, Drivers, 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-OB16PXT Digital DC Output Module Specs

General

  • Manufacturer Allen-Bradley
  • Model 1794-OB16PXT
  • Condition New Original ready stock
  • Product Family 1794-OB8EP,1794-OA8I,1794-L34,1794-IE4X0E2
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.
  • Oil & Gas Remote Terminal Units (RTUs): Deployed in remote pipeline valve cells, wellhead monitoring stations, and gas compressor control panels where wide ambient temperature shifts are standard.
  • Wind Turbines (Nacelle & Tower Control): Installed within wind turbine nacelles or tower bases, surviving intense high/low-temperature cycles and continuous mechanical vibration.
  • Wastewater and Remote Water Pumping: Controls chemical dosing pumps, motorized water valves, and indicators in outdoor, high-humidity, and mildly corrosive atmospheres.
  • Outdoor Machinery & Conveyors: Manages signaling and small contactor coils on harbor cranes, mining shovels, and long-distance bulk material handling routes without needing expensive climate-controlled enclosures.
  • Instant Cut-off: Each output channel is monitored by an integrated smart electronic switch. If a field short-circuit or an excessive load current occurs, the impacted channel shuts off automatically within milliseconds.
  • Fault Latching: Once a channel trips, it latches in the fault state. It remains deactivated until the supervising PLC sends a reset command or the module experiences a physical power cycle.
  • Onboard LEDs: Features 16 yellow channel status LEDs on the front panel. When a short-circuit fault forces a channel to trip, the corresponding LED alters its behavior (e.g., turning off or flashing under specific configuration metrics) to isolate the fault.
  • PLC-Level Fault Flags: Channel fault status bits are continuously mapped across the FLEX I/O backplane to the host controller (e.g., ControlLogix). This enables live fault mapping on local SCADA or HMI screens, telling maintenance engineers exactly which field wire is shorted.
  • Terminal Base Matching: The 1794-OB16PXT module is a modular slice that must be plugged onto a standard FLEX I/O Terminal Base. For optimal routing, screw-clamp models 1794-TB3 or spring-clamp models 1794-TB3S are highly recommended.
  • Sourcing Topology: The module uses sourcing outputs. When a channel is switched ON, it bridges the +24 Vdc field power supply directly to the load. Both the +24 Vdc supply (+V) and its corresponding common (-V/COM) must be properly wired to the terminal base to feed the output circuit.
  • Mounting: Snaps onto standard 35mm DIN rails. Despite its extended thermal limits, standard clearances must be maintained around the assembly inside tight enclosures to preserve optimal convection airflow.
Description
The 1794-OB16PXT is a FLEX I/O-XT (Extreme Temperature) digital output module from Allen-Bradley, designed for harsh industrial environments. This module provides 16 sourcing (positive logic) DC outputs, operating at 10-31.2V DC with a maximum current rating of 2A per point. The 1794-OB16PXT features a pilot duty rating of 2A, making it suitable for controlling solenoids, relays, and indicator lights. 

The 1794-OB16PXT is built for extreme temperature applications, operating reliably from -20°C to +70°C (-4°F to +158°F), with storage capability from -40°C to +85°C. This XT-rated module has a power dissipation of 6.0W maximum at 31.2V DC and thermal dissipation of 20.3 BTU/hr. The 1794-OB16PXT includes 16 yellow status indicators for field side indication (logic driven), allowing quick visual confirmation of output states. 

For environmental robustness, the 1794-OB16PXT meets rigorous IEC standards including 30g operating shock, 5g vibration at 10-500 Hz, and 95% noncondensing humidity. The 1794-OB16PXT carries North American temperature code T4A, with IECEx and UKEX/ATEX temperature code T4. 

The 1794-OB16PXT requires a terminal base (sold separately) which determines wire size and screw torque. Keyswitch position is set to 2 for this module. The 1794-OB16PXT is an open-style module (no enclosure type rating), requiring installation in a suitable cabinet. The 1794-OB16PXT is designed for Logix-based systems, with status indicators driven by logic rather than direct field power. 
Alternative Names
1794-OBI6PXT 1794 OB16PXT 1794-IB8 1794-IA8 1794-IE4X0E2 1794-L34 1794-OA8I 1794-OB8EP
Technical notes
The 1794-OB16PXT is a 16-point sourcing DC output module for FLEX I/O-XT systems. Rated 10-31.2V DC, 2A per point. Operating temperature: -20°C to +70°C. Features 16 yellow status indicators, 30g shock, 5g vibration. Temp code T4A (North America) and T4 (IECEx/ATEX).
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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 does the "XT" suffix in 1794-OB16PXT signify?
"XT" stands for Extreme Temperature. The 1794-OB16PXT operates from -20°C to +70°C, compared to standard FLEX I/O modules which typically operate from 0°C to +55°C, making it suitable for cold storage, outdoor, and desert applications.
How many outputs does 1794-OB16PXT provide?
The 1794-OB16PXT provides 16 sourcing (positive logic) DC outputs, each rated at 2A maximum at 10-31.2V DC. It has a pilot duty rating of 2A, suitable for solenoid and relay control.
What is the keyswitch position for 1794-OB16PXT?
The 1794-OB16PXT requires keyswitch position 2 on the terminal base. This mechanical keying prevents incorrect module insertion into the wrong terminal base.
Does 1794-OB16PXT include output status indicators?
Yes, the 1794-OB16PXT features 16 yellow status indicators for field side indication. These indicators are logic-driven (controlled by the Logix system), providing visual confirmation of each output's on/off state.

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