1794-OB16
1794-OB16
1794-OB16
1794-OB16
1794-OB16
1794-OB16
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1794-OB16

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Allen-Bradley 1794-OB16 is a FLEX I/O 16-point 24 VDC sourcing output module rated for 0.5 A per channel and 8 A total.
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Technical specifications for 1794-OB16

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1794-OB16
  • Product Family:
    Flex I/O
  • Product Type:
    FLEX I/O 16-Point DC Source Output Module
  • Stock:
    1
  • Number of Outputs:
    16 sourcing outputs
  • Nominal Output Voltage:
    24V DC
  • Output Current:
    0.5A per channel; 8A total
  • Recommended Terminal Bases:
    1794-TB2, 1794-TB3, 1794-TB3S
  • Flexbus Current:
    80mA at 5V DC
  • Output Protection:
    External fusing recommended
  • Weight:
    0.078 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 Base Power Path Load Scheduling Image Mapping Product Applications

Features:

  • Sixteen current-sourcing output points for DC field loads
  • Direct output-image mapping with individual yellow status indicators
  • Terminal-base supply path shared across the output group
1794-OB16 is the non-protected sourcing catalog in this FLEX I/O output role, separating it from variants that add electronic channel protection.

The quickest selection check is therefore not point count alone, but whether the project expects a simple command image and external field protection.

Base distribution, simultaneous-load behavior, and controller mapping remain separate acceptance decisions for the completed output group.
Apter Power can coordinate official-document review, quotation, and sourcing support for 1794-OB16.
1794-OB16 FLEX I/O 16-Point DC Source Output Module Manuals, Datasheets, Links 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.
  • Listed bases: The module uses the documented TB2, TB3, or TB3S family arrangements and their keyed variants.
  • Supply routing: Output common and positive DC power follow the assigned B-row and C-row distribution paths.
  • Feed capacity: Daisy-chained base current is limited, so a heavily loaded group may need a separate power connection.
  • Channel boundary: Each output must remain within its individual current rating during normal operation.
  • Group boundary: The simultaneous load schedule must also remain within the aggregate module rating.
  • Starting demand: Solenoid or lamp inrush must be checked against the documented repeatable surge profile.
  • Write image: One controller bit corresponds to each of outputs 0 through 15.
  • Field indication: Sixteen yellow indicators show the commanded field-side output states.
  • Fault expectation: Logic must not invent electronic channel-fault bits that belong to protected catalogs.
  • Discrete DC actuation: Switch sourcing field loads from a distributed FLEX I/O station.
  • Machine sequencing: Control approved solenoids, indicators, and similar loads within the documented current envelope.
  • Remote output groups: Place controller-commanded DC outputs near the machine when terminal-base power is engineered locally.
Description
Within a distributed FLEX I/O station, 1794-OB16 is the Allen-Bradley module that turns controller commands into sourcing control of DC field loads. It occupies the output side of the station and is selected as part of a terminal-base and field-circuit design rather than as a stand-alone card.

Machine sequencing gives 1794-OB16 its practical role: the controller decides when approved actuators or indicators are energized near the equipment. The module does not replace the branch protection or load-engineering responsibilities that remain in the surrounding panel.

When a protected output catalog or an older station is being changed, 1794-OB16 should be evaluated against the existing diagnostic expectations and field-circuit plan. A visually compatible FLEX I/O position is not, by itself, evidence that the original protection and controller behavior will be retained.
Alternative Names
Allen-Bradley FLEX I/O OB16 Rockwell 1794 OB16 DC Output Module FLEX I/O 16-Point Sourcing Output
Technical notes
The outputs of 1794-OB16 are not internally fused. Rockwell Automation recommends external fusing and identifies a suitable fuse type; place protection in the field circuit, coordinate it with the connected load and fault-clearing method, and stop commissioning if the branch-protection design has not been documented.
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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.
When a field fuse opens, why should troubleshooting of 1794-OB16 begin outside the controller program?
This catalog has no internal electronic output protection. Inspect the external fuse, load wiring, device condition, and fault-clearing path before treating a missing output as a controller-image or module fault.
Why can several solenoids make 1794-OB16 misoperate even though every settled load is within its channel limit?
Their simultaneous inrush can exceed the module surge profile, terminal-base path, or supply response. Measure or calculate the combined start event, then stagger the sequence or redesign the load group before retrying.
Can 1794-OB16 replace an electronically protected FLEX I/O output without changing diagnostics?
No. This catalog does not provide the same channel protection and fault behavior. Compare the terminal base, output image, external fuse plan, alarm logic, and load schedule before accepting the change.
If a new 1794-OB16 group causes voltage drop along daisy-chained bases, what should the panel engineer review?
Add the output demand and downstream base current, inspect the positive and common jumpers, and compare the result with terminal-base capacity. Feed the affected base separately when the shared path is no longer acceptable.
During a PLC conversion, how should 1794-OB16 be mapped without creating false channel alarms?
Map one command bit to each field output and use the yellow indicators for local state checks. Do not create electronic fault bits unless another installed device actually supplies them.
When must service on 1794-OB16 stop before the terminal base is disturbed?
Remove backplane and field power, or follow the documented nonhazardous-area condition, before disconnecting wiring or moving the module. Confirm that stored energy in the loads has also cleared.

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