1794-OB16P
1794-OB16P
1794-OB16P
1794-OB16P
1794-OB16P
1794-OB16P
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1794-OB16P

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Allen-Bradley 1794-OB16P is a FLEX I/O 16-point protected sourcing output module that switches 24 V DC field loads while providing electronic output protection.
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Technical specifications for 1794-OB16P

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1794-OB16P
  • Product Family:
    Flex I/O
  • Product Type:
    FLEX I/O 16-Point Protected Digital Output Module
  • Stock:
    1
  • Output Type:
    Current-sourcing
  • Output Protection:
    Electronic
  • Recommended Terminal Bases:
    1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3K, 1794-TB3SK
  • On-State Voltage:
    10–31.2 V DC
  • Nominal Voltage:
    24 V DC
  • Module Output Current:
    8 A total
  • Channel Current:
    1–500 mA
  • On-State Voltage Drop:
    0.5 V DC maximum
  • Surge Current:
    1.5 A for 50 ms, repeatable every 2 s
  • Off-State Leakage:
    0.5 mA maximum
  • Isolation:
    50 V continuous field-to-system; no channel-to-channel isolation
  • Output Delay:
    0.5 ms OFF-to-ON; 1.0 ms ON-to-OFF
  • FLEXBUS Current:
    60 mA at 5 V DC
  • External Supply Current:
    76 mA at 24 V DC
  • Field Indicators:
    16 yellow status indicators
  • Power Dissipation:
    5.0 W maximum at 31.2 V DC
  • Thermal Dissipation:
    17.0 BTU/h maximum at 31.2 V DC
  • Enclosure Type:
    Open-style
  • Operating Temperature:
    −20 to +55 °C
  • Weight:
    0.163 lbs (0.074 kg)
  • Estimated shipping dimensions:
    9.4x9.4x6.9cm
  • Tariff Code:
    8537101190
  • Country of origin:
    Singapore
  • 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 Output Path Protection Logic Terminal Base Image Mapping

Features:

  • Allen-Bradley 1794-OB16P places sixteen protected sourcing outputs at a FLEX I/O station.
  • The output image controls 24 V DC field loads through the module's electronic switching stage.
  • Sixteen yellow indicators show the commanded state of the individual output points.
FLEXBUS supplies the module logic while a separate field source provides energy for the connected loads.

Electronic protection acts at the output stage and limits the effect of overload or short-circuit conditions.

A compatible terminal base retains supply, common and output conductors beneath the removable electronics.

The Allen-Bradley 1794-OB16P FLEX I/O Output Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen-Bradley 1794-OB16P FLEX I/O Output 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.

Driving a DC load from the FLEX I/O image

  • Adapter command: Each image-table bit represents one of the sixteen output points.
  • Sourcing stage: An active channel connects positive field power toward its assigned load.
  • Return path: Load current completes through the DC common on the terminal base.
  • Point indication: A yellow indicator follows the commanded state for local checking.

Containing an overloaded output point

  • Electronic limit: A protected channel restricts fault energy when excessive current is detected.
  • Fault removal: The overload or short circuit must be cleared before normal switching resumes.
  • Surge boundary: The short pulse allowance is separate from the continuous-current rating.
  • Thermal total: Point loading must remain within the complete module current and dissipation limits.

Keeping permanent wiring below the removable module

  • Compatible bases: Supported 1794 terminal bases carry output, supply and common conductors.
  • Removable electronics: Module replacement leaves terminated field wires on the base.
  • Keyswitch: Position 2 helps prevent an incompatible FLEX I/O module from occupying the base.
  • Power distribution: Field-source capacity and conductor grouping must cover every energized load.

Relating controller bits to physical outputs

  • Sixteen-bit map: Image positions 0 through 15 align with physical points 0 through 15.
  • Cyclic transfer: The communication adapter moves the controller image into the module over FLEXBUS.
  • Switching response: The field stage changes after its OFF-to-ON or ON-to-OFF interval.
  • State comparison: Controller command, point indicator and load voltage should agree during checks.
Description
Allen-Bradley 1794-OB16P is a FLEX I/O digital output module that places sixteen protected sourcing channels at a distributed I/O station. It converts output-image data from the adapter into 24 V DC switching commands for connected field loads.

Each channel on Allen-Bradley 1794-OB16P sources current toward its assigned load and includes electronic protection. Sixteen yellow indicators correspond to the individual points so the commanded output state can be checked at the module.

Logic power for Allen-Bradley 1794-OB16P comes from FLEXBUS, while the external DC source supplies the field-output stage. The sourcing arrangement requires the load return to use the common conductors established on the selected terminal base.

Installation of Allen-Bradley 1794-OB16P relies on a supported 1794 terminal base, which retains field supply, common and output wiring beneath the removable module. The output points share the field-side grouping and do not provide channel-to-channel isolation.
Revisions

Revision Part #

Also known as

1794-OB16P Ser A
1794-OB16P/A, Series A, Rev A
Alternative Names
Allen-Bradley 1794-OB16P 1794 OB16P 1794OB16P A-B 1794-OB16P 1794-0B16P 1794-OBI6P FLEX I/O 1794-OB16P 1794-OB16P Series A
Technical notes
1794-OB16P requires a compatible FLEX I/O terminal base and a 10–31.2 V DC field supply. Keep 1794-OB16P channel current, module total current and common-return loading within their documented limits.
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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.
Which field-load polarity should be planned for Allen-Bradley 1794-OB16P?
Allen-Bradley 1794-OB16P provides sourcing outputs, so each load must return through the correctly designed DC common path.
What should be checked after Allen-Bradley 1794-OB16P reports a protected output condition?
Remove the overload or short circuit, verify channel current and wiring, then restore the command to Allen-Bradley 1794-OB16P.
Can one Allen-Bradley 1794-OB16P channel drive more than 500 mA continuously?
No; Allen-Bradley 1794-OB16P limits each output to 500 mA and the complete module to 8 A.
Why must the terminal base be confirmed before replacing Allen-Bradley 1794-OB16P?
Allen-Bradley 1794-OB16P uses a defined group of 1794 terminal bases whose field terminals establish the supply and common connections.
How quickly does Allen-Bradley 1794-OB16P change a discrete load state?
Allen-Bradley 1794-OB16P specifies 0.5 ms OFF-to-ON delay and 1.0 ms ON-to-OFF delay.
Does Allen-Bradley 1794-OB16P isolate every output channel from the others?
Allen-Bradley 1794-OB16P has field-to-system isolation but no isolation between individual output channels.
What confirms the commanded point at an Allen-Bradley 1794-OB16P station?
Sixteen yellow field-side indicators on Allen-Bradley 1794-OB16P show the output-point states associated with the module image.

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