1794-OB16 | Allen-Bradley Flex I/O Output Module, 24VDC, 16 Source Outputs
1794-OB16 | Allen-Bradley Flex I/O Output Module, 24VDC, 16 Source Outputs
1794-OB16 | Allen-Bradley Flex I/O Output Module, 24VDC, 16 Source Outputs
    1794-OB16 | Allen-Bradley Flex I/O Output Module, 24VDC, 16 Source Outputs
1794-OB16 | Allen-Bradley Flex I/O Output Module, 24VDC, 16 Source Outputs

1794-OB16 | Allen-Bradley Flex I/O Output Module, 24VDC, 16 Source Outputs

Part #: 1794-OB16 Manufactured by: Allen-Bradley
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$280.00
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$280.00
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Product Overview
The Allen-Bradley 1794-OB16 Flex I/O Digital DC Output Module has 16 Sourcing Current Outputs, a 24V DC On-state Voltage n...  Read more
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Product Description P/N: 1794-OB16

Description / Specifications

Description 

The Allen-Bradley 1794-OB16 is a Flex IO discrete output module. This module features Sixteen (16) 24VDC sourcing output channels. It is compatible with a variety of terminal base units such as 1794-TB2, 1794-TB3, 1794-TB3S,1794-TB3K, 1794-TB3SK. It is compatible with any 1794 Flex IO adapters to implement distributed I/O application.

 

Technical Specifications 

 

Brand Allen-Bradley
Manufacturer Rockwell Automation
Part Number 1794-OB16
Product Description Flex IO DC Output Module
Operating Shock 30 g
Vibration 5g @ 10 to 500 Hz
Storage Temperature -40 to 85 C (-40 to 185 F)
Operating Temperature 0 to 55 C (32 to 131 F)
Wire Size Determined by installed terminal base
Mounting DIN Rail
Enclosure Open-type
Keyswitch position 2
Indicators 16 Yellow status indicators
ON state Voltage, nom 24VDC
ON state Voltage, max. 31.2VDC
ON state Voltage, min 10VDC
Terminal base 1794-TB2,1794-TB3,1794-TB3S, 1794-TB3K, 1794- TB3SK
Number of Outputs 16, sourcing
Product Type Flex I/O Digital DC Output Module
Outputs 16 Sourcing Current
On-state Voltage nom. 24V DC
Output Current Rating 8.0A
On-state Current max. 500mA per Channel
On-state Voltage Drop max. 0.5V DC
Off-state Leakage Current max. 0.5mA
Isolation Voltage 50V Continuous
Flexbus Current 80mA @ 5V DC
Power Dissipation 5.3W @ 31.2V DC max.
Thermal Dissipation 18.1 BTU/hr. @ 31.2V DC max.

  

 

Information About 1794-OB16

The Allen-Bradley 1794-OB16 module is a digital DC output module for FLEX I/O. It has 16 current sourcing outputs. The minimum, maximum, and nominal on-state voltages are 10 Volts DC, 31.2 Volts DC, and 24 Volts DC, respectively. The output current rating of all the 16 outputs (each rated at 0.5 Amps) is 8 Amps while the minimum on-state current is 1 milliamp per channel and the maximum on-state current is 500 milliamps per channel. The maximum on-state voltage drop is 0.5 Volts DC. The surge current is 2 Amps for 50 milliseconds and it is repeatable every 2 seconds. The maximum off-state leakage current is 0.5 milliamps. The isolation voltage is 50 Volts continuous. The module has been tested at 850 Volts DC for 1 second between the users and the system.

The output signal delay for the 1794-OB16 module is 0.5 milliseconds for off-to-on and it is 1 millisecond for on-to-off. The FlexBus current is 80 milliamps at 5 Volts DC leading to 5.3 Watts of maximum power dissipation at 31.2 Volts DC. The thermal dissipation of the 1794-OB16 module is 18.1 BTU per hour. The maximum off-state voltage is 31.2 Volts DC. The module dimensions are 3.7 x 3.7 x 2.7 inches. The approximate weight for the 1794-OB16 module is 78 grams. The module has 16 yellow indicators for field-side status indication. The wiring size depends on the installed terminal base. The module has an open enclosure and it complies with the T3 IEC temperature code. The operating temperature range is from -4 to 131 degrees Fahrenheit.

This module comes with Sixteen (16) channel 24VDC Discrete output channels that supports source wiring configuration. It is used with a terminal base and supports a variety of terminal base such as 1794-TB2,1794-TB3,1794-TB3S, 1794-TB3K and1794-TB3SK. The Up to Eight (8) instances of 1794-OB16 may be installed in a single Flex I/O rack. Additionally, the 1794-OB16 may also be used as local I/O adapter of FlexLogix Controller or the FlexLogix Local IO extender (1794-FLA). This module has a keyswitch position 2 and has an open-type enclosure rating.

The 1794-OB16 deliver output an output voltage range of 10 to 31.2VDC with nominal Voltage output of 24VDC. It measures 94 x 94 x 69 mm (3.7 x 3.7 x 2.7 in.) and weighs 78 g (2.75 oz.). This module does not come with internal fusing therefore, external fusing may be installed, as required by the system. Recommended fuse for installation of external fusing is SAN-O MQ4-800 mA fuses. This module is provided with Sixteen (16) fields side LED indicators.

The 1794-OB16 has an Operating Temperature range of 0 to 55 °C (32 to 131 °F), and storage temperature of 55 °C (131 °F) with shock and vibration rating of 30g and 5 g @ 10 to 500 Hz, respectively. This module carries c-UL-us, CSA, CE, Ex, TÜV, KC, EAC and RCM certifications.





Manufacturer information

Allen-Bradley, a brand of Rockwell Automation, specializes in manufacturing industrial automation equipment. The product range includes programmable logic controllers (PLCs), motion control systems, safety devices, motor control equipment, automation software, and HMI panels. Allen-Bradley products are known for their reliability and integration with other systems.

Frequently Asked Questions about 1794-OB16
Question: What is the 1794-OB16?
Date Update:19/06/2025
Answer:

The Allen-Bradley 1794-OB16 is a Flex I/O 16-point DC digital output module, designed to provide PNP (sourcing) outputs for industrial automation systems. It is part of the 1794 Flex I/O series, which is known for its modular, scalable architecture that allows flexible mounting of I/O close to field devices.

This module is used to control digital devices such as:

  • Indicator lights
  • Relays
  • Contactors
  • Solenoid valves

It interfaces with a central PLC (e.g., ControlLogix or CompactLogix) via an I/O adapter (like 1794-AENT) and mounts on a 1794 terminal base (such as 1794-TB3, TB2, etc.).

Question: How do I wire the 1794‑OB16?
Date Update:19/06/2025
Answer:
  • Install the module into a compatible terminal base (e.g., 1794‑TB2, ‑TB3, ‑TB3S)
  • Connect individual outputs (0–15) to the top row (A) terminals.
  • Tie the common returns to the corresponding bottom row (B) terminals (16–31; commons are internally linked)
  • Wire +24 V DC to terminal 34 (power bus), and DC return to terminal 16 on the same base
  • For daisy‑chaining, jumper +24 V from terminal 51 of this base to terminal 34 of the next base
Question: Which replacement or equivalent modules are available?
Date Update:19/06/2025
Answer:
  • The 1794‑OB16 is an active mature module still supported by Rockwell
  • XT variants (e.g., 1794‑OB16XT) offer extended temperature ratings (−20 °C to +70 °C) and conformal coating
Question: What are the module’s physical dimensions and mounting details?
Date Update:19/06/2025
Answer:
  • Physical size: Approx. 31 mm (1.22″) wide × 105 mm (4.13″) tall × 127 mm (5.00″) deep (including terminal base).
  • It uses a standard 1794 terminal base mounted on DIN rail. The module clips onto the base and keys to prevent misalignment. The installation guide confirms correct mounting orientation.
Question: What are the 1794-OB16 electrical and output specifications?
Date Update:19/06/2025
Answer:
  • Output configuration: 16 sourcing (PNP) outputs
  • Voltage range: 10–31.2 V DC
  • Max current: 0.5 A per channel, 8 A total per module
  • Voltage drop: ≤ 0.5 V while ON
  • Backplane power draw: ~80 mA @ 5 V DC; plus 90 mA @ 24 V DC for local circuits
  • Power dissipation: ~5.3 W (31.2 V supply) / 18.1 BTU/hr
IQElectro is not an authorized distributor.
QElectro LLC (IQElectro) is NOT an Authorized Distributor or in any way affiliated with Rockwell Automation, Siemens, or any other Manufacturers. IQElectro is NOT an Authorized Dealer of this product. The product may be of older version, date codes, or design than that available from authorized dealers. As IQElectro is not an authorized dealer of this product, the Original Manufacturer's Warranty and Support DO NOT apply. IQElectro sells SURPLUS only and DOES NOT SELL SOFTWARE or FIRMWARE licenses For more detailed information, please refer to the full version of our disclaimer policy Disclaimer Policy.
Description / Specifications

Description 

The Allen-Bradley 1794-OB16 is a Flex IO discrete output module. This module features Sixteen (16) 24VDC sourcing output channels. It is compatible with a variety of terminal base units such as 1794-TB2, 1794-TB3, 1794-TB3S,1794-TB3K, 1794-TB3SK. It is compatible with any 1794 Flex IO adapters to implement distributed I/O application.

 

Technical Specifications 

 

Brand Allen-Bradley
Manufacturer Rockwell Automation
Part Number 1794-OB16
Product Description Flex IO DC Output Module
Operating Shock 30 g
Vibration 5g @ 10 to 500 Hz
Storage Temperature -40 to 85 C (-40 to 185 F)
Operating Temperature 0 to 55 C (32 to 131 F)
Wire Size Determined by installed terminal base
Mounting DIN Rail
Enclosure Open-type
Keyswitch position 2
Indicators 16 Yellow status indicators
ON state Voltage, nom 24VDC
ON state Voltage, max. 31.2VDC
ON state Voltage, min 10VDC
Terminal base 1794-TB2,1794-TB3,1794-TB3S, 1794-TB3K, 1794- TB3SK
Number of Outputs 16, sourcing
Product Type Flex I/O Digital DC Output Module
Outputs 16 Sourcing Current
On-state Voltage nom. 24V DC
Output Current Rating 8.0A
On-state Current max. 500mA per Channel
On-state Voltage Drop max. 0.5V DC
Off-state Leakage Current max. 0.5mA
Isolation Voltage 50V Continuous
Flexbus Current 80mA @ 5V DC
Power Dissipation 5.3W @ 31.2V DC max.
Thermal Dissipation 18.1 BTU/hr. @ 31.2V DC max.

  

 

Information About 1794-OB16

The Allen-Bradley 1794-OB16 module is a digital DC output module for FLEX I/O. It has 16 current sourcing outputs. The minimum, maximum, and nominal on-state voltages are 10 Volts DC, 31.2 Volts DC, and 24 Volts DC, respectively. The output current rating of all the 16 outputs (each rated at 0.5 Amps) is 8 Amps while the minimum on-state current is 1 milliamp per channel and the maximum on-state current is 500 milliamps per channel. The maximum on-state voltage drop is 0.5 Volts DC. The surge current is 2 Amps for 50 milliseconds and it is repeatable every 2 seconds. The maximum off-state leakage current is 0.5 milliamps. The isolation voltage is 50 Volts continuous. The module has been tested at 850 Volts DC for 1 second between the users and the system.

The output signal delay for the 1794-OB16 module is 0.5 milliseconds for off-to-on and it is 1 millisecond for on-to-off. The FlexBus current is 80 milliamps at 5 Volts DC leading to 5.3 Watts of maximum power dissipation at 31.2 Volts DC. The thermal dissipation of the 1794-OB16 module is 18.1 BTU per hour. The maximum off-state voltage is 31.2 Volts DC. The module dimensions are 3.7 x 3.7 x 2.7 inches. The approximate weight for the 1794-OB16 module is 78 grams. The module has 16 yellow indicators for field-side status indication. The wiring size depends on the installed terminal base. The module has an open enclosure and it complies with the T3 IEC temperature code. The operating temperature range is from -4 to 131 degrees Fahrenheit.

This module comes with Sixteen (16) channel 24VDC Discrete output channels that supports source wiring configuration. It is used with a terminal base and supports a variety of terminal base such as 1794-TB2,1794-TB3,1794-TB3S, 1794-TB3K and1794-TB3SK. The Up to Eight (8) instances of 1794-OB16 may be installed in a single Flex I/O rack. Additionally, the 1794-OB16 may also be used as local I/O adapter of FlexLogix Controller or the FlexLogix Local IO extender (1794-FLA). This module has a keyswitch position 2 and has an open-type enclosure rating.

The 1794-OB16 deliver output an output voltage range of 10 to 31.2VDC with nominal Voltage output of 24VDC. It measures 94 x 94 x 69 mm (3.7 x 3.7 x 2.7 in.) and weighs 78 g (2.75 oz.). This module does not come with internal fusing therefore, external fusing may be installed, as required by the system. Recommended fuse for installation of external fusing is SAN-O MQ4-800 mA fuses. This module is provided with Sixteen (16) fields side LED indicators.

The 1794-OB16 has an Operating Temperature range of 0 to 55 °C (32 to 131 °F), and storage temperature of 55 °C (131 °F) with shock and vibration rating of 30g and 5 g @ 10 to 500 Hz, respectively. This module carries c-UL-us, CSA, CE, Ex, TÜV, KC, EAC and RCM certifications.





Manufacturer information

Allen-Bradley, a brand of Rockwell Automation, specializes in manufacturing industrial automation equipment. The product range includes programmable logic controllers (PLCs), motion control systems, safety devices, motor control equipment, automation software, and HMI panels. Allen-Bradley products are known for their reliability and integration with other systems.

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