Allen-Bradley 1791-16BC
Allen-Bradley 1791-16BC
Allen-Bradley 1791-16BC
Allen-Bradley 1791-16BC
Allen-Bradley 1791-16BC
Allen-Bradley 1791-16BC
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1791-16BC

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Allen-Bradley 1791-16BC is a 24 V DC Block I/O module with sixteen inputs, sixteen sourcing outputs, and Universal Remote I/O communication.
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Technical specifications for 1791-16BC

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1791-16BC
  • Product Family:
    1791 Block I/O
  • Product Type:
    16-Input 16-Output DC Block I/O Module
  • Stock:
    1
  • Inputs:
    16; two groups of 8
  • Input Voltage Range:
    10 to 30 V DC
  • Input Impedance:
    3.4 kΩ maximum
  • Input Delay Fast:
    1.0 ms on; 5.0 ms off maximum
  • Input Delay Slow:
    1.0 ms on; 18.0 ms off maximum
  • Outputs:
    16; two groups of 8
  • Output Voltage Range:
    10 to 30 V DC
  • Output Rating Vertical:
    1 A at 30°C; 0.5 A at 60°C
  • Output Rating Horizontal:
    0.5 A at 30°C; 0.25 A at 60°C
  • Output Surge Current:
    3 A for 50 ms, repeatable every 2 seconds
  • External Power:
    19.2 to 30 V DC; 300 mA
  • Isolation:
    500 V AC power-to-RIO, group-to-group, and group-to-logic
  • Power Dissipation:
    17.8 W maximum
  • Operating Temperature:
    0°C to 60°C
  • Storage Temperature:
    -40°C to 85°C
  • Relative Humidity:
    5% to 95%, non-condensing
  • Dimensions:
    11.05 × 17.65 × 9.8 cm
  • Weight:
    0.78 kg
  • Tariff Code:
    8538900000
  • 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 RIO Setup Load Planning Installation Application
  • Sixteen DC inputs and sixteen sourcing DC outputs
  • Communicates on the Universal Remote I/O link
  • Field-mounted block form factor with grouped isolation

1791-16BC concentrates a full set of discrete input and output points near the machine while returning their image through Remote I/O.

Two groups of eight provide structured power and return connections, and the output loading changes with mounting direction and temperature.

The block therefore has to be replaced as a wired and addressed network station, not merely as a point-count-equivalent I/O device.

Availability, condition, price, and shipping time for 1791-16BC are confirmed during quotation.

Allen-Bradley 1791-16BC Series B 16-Input/16-Output DC Block I/O 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.

  • Restore block address and baud rate
  • Preserve scanner rack and group mapping
  • Verify RIO conductor polarity and termination
  • Check sourcing-load polarity and voltage
  • Apply mounting-orientation current derating
  • Provide recommended external output fusing
  • Maintain clearance on all sides
  • Preserve field-wire identification
  • Verify grounding, shield, and external power before startup
  • Distributed 24 V DC machine I/O
  • Remote I/O stations near field devices
  • Combined sensor input and actuator output control
Description
Allen-Bradley 1791-16BC combines sixteen DC inputs and sixteen DC outputs in a distributed Block I/O station connected to an Allen-Bradley Remote I/O link.

Inputs and outputs are arranged as two groups of eight, with documented group isolation, configurable input response, and output-current derating based on mounting orientation and ambient temperature.

Replacement work should retain the block address, RIO baud rate, last-state or reset behavior, I/O image mapping, wiring labels, external output fusing, mounting orientation, and enclosure clearances.
Revisions

Revision Part #

Also known as

1791-16BC Ser B
1791-16BC/B, Series B, Rev B
Alternative Names
1791-16BC Allen-Bradley 1791-16BC Rockwell Automation 1791-16BC 1791-16BC/B Allen-Bradley 1791-16BC/B Allen-Bradley 1791 Block I/O 1791-16BC
Technical notes
1791-16BC replacement requires matching RIO address and baud rate, input delay, output state behavior, sourcing-load polarity, external fusing, mounting derating, wiring, and enclosure clearance; incorrect setup can mis-map field I/O.
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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 must be retained before replacing Allen-Bradley 1791-16BC?
Record the RIO rack and group address, baud rate, input-delay selection, output reset or hold-last-state behavior, I/O mapping, field wiring, and mounting orientation.
Why does mounting orientation matter for Allen-Bradley 1791-16BC?
The official output-current ratings are lower for horizontal mounting, so load calculations must use the actual orientation and maximum ambient temperature.
Does Allen-Bradley 1791-16BC provide fused outputs?
No. The module is internally protected, but Rockwell recommends external output fusing using the documented fuse guidance for the connected circuits.
Why can Allen-Bradley 1791-16BC show communication loss after replacement?
Check the RIO cable, blue and clear conductor polarity, shield, terminator, block address, baud-rate switches, scanner configuration, and external power.
Why can Allen-Bradley 1791-16BC outputs energize incorrectly even when the block communicates?
Compare the scanner image, group supplies and returns, output-state selection, field wiring, and restored logic because communication alone does not prove the output map or power grouping.
Can Allen-Bradley 1791-16BC replace separate input and output blocks without redesigning the station?
Not as a simple substitution. The combined block changes Remote I/O mapping, address use, group power, returns, fusing, enclosure space, and field termination.
What should be checked when Allen-Bradley 1791-16BC has a healthy communication LED but one field point does not respond?
Use the point indicator to separate logic-side status from field-side faults, then check the supply, return, terminal, fuse, load polarity, wiring continuity, and controller image bit.

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