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    Discontinued / Obsolete by OEM
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1794-ASB

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Allen-Bradley 1794-ASB is a Series E FLEX I/O Remote I/O adapter for an eight-module bank operating at 57.6, 115.2, or 230.4 Kbps.
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Technical specifications for 1794-ASB

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1794-ASB
  • Product Family:
    Flex I/O
  • Product Type:
    FLEX I/O Remote I/O Adapter
  • Stock:
    1
  • Network:
    Allen-Bradley Remote I/O
  • Supported data rates:
    57.6, 115.2, or 230.4 Kbps
  • Maximum I/O modules:
    8
  • Current series:
    Series E
  • Nominal input voltage:
    24 V DC
  • Input voltage range:
    19.2...31.2 V DC
  • FLEXBus output:
    5 V DC, 640 mA maximum
  • Maximum input current:
    450 mA
  • Power consumption:
    4.6 W
  • Operating temperature:
    0...55 °C
  • Enclosure type:
    Open-style
  • Estimated shipping dimensions:
    8.7x6.8x6.9cm
  • Tariff Code:
    Please confirm the destination before shipping
  • 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 Addressing Scanner Review Termination Product Applications

Features:

  • Remote I/O interface: the adapter links FLEX I/O to a legacy RIO scanner
  • Three baud rates: 57.6, 115.2, and 230.4 Kbps are switch-selectable
  • Series E station: as many as eight modules share a 640 mA FLEXBus supply
1794-ASB belongs to Remote I/O architectures where scanner identity, rack addressing, and block-transfer behavior define the station.

Its switches carry essential configuration information that cannot be recovered from the catalog number alone.

A maintenance record should join switch photographs with the processor, scanner, termination, module sequence, and controller-program evidence.

Rockwell Automation documentation identifies 1794-ASB as a discontinued legacy adapter; availability is subject to Apter Power sourcing confirmation.
Allen-Bradley 1794-ASB FLEX I/O Remote I/O Adapter 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.

Reconstruct the station identity from evidence

  • Rack number: record the configured logical rack address.
  • Starting group: preserve the station group and rack-size choices.
  • Switch image: photograph every bank before removal.
  • Program map: match physical modules to the scanner I/O definition.

Confirm the approved Remote I/O controller path

  • Scanner: identify the exact scanner catalog and channel.
  • Processor: verify the host processor against the official limitations.
  • Block transfer: retain instructions and data files used by analog or specialty modules.
  • Baud rate: match 57.6, 115.2, or 230.4 Kbps across the segment.

Protect the physical RIO segment

  • End position: determine whether the adapter is at a physical network end.
  • Resistor: retain the approved 82 or 150 ohm termination defined by the scanner documentation.
  • Blue Hose: inspect conductors, shield, polarity, routing, and connector integrity.
  • Baseline: capture channel diagnostics before disconnecting the station.

Officially supported application roles

  • Legacy Remote I/O: connect distributed FLEX I/O to an approved scanner.
  • Eight-module stations: serve a compact RIO bank under the bus-current limit.
  • Plant maintenance: restore a documented rack address and baud configuration.
  • Migration studies: capture block-transfer and field-wiring dependencies before modernization.
Description
1794-ASB connects a FLEX I/O station to an Allen-Bradley Remote I/O network. Series E supports eight local modules and selectable 57.6, 115.2, or 230.4 Kbps communication rates.

A nominal 24 V DC supply powers 1794-ASB, which provides 5 V DC at up to 640 mA to FLEXBus. Adapter switches establish rack addressing, baud rate, and related station behavior for the installed scanner.

As a discontinued legacy adapter, 1794-ASB requires exact recovery records. Rockwell documentation also states that it is not intended for Classic PLC-5/15 or PLC-5/25 processors, so processor and scanner identity must be checked before selection.
Revisions

Revision Part #

Also known as

1794-ASB Series E
1794-ASB/E, Series E
Alternative Names
Allen-Bradley 1794-ASB adapter Rockwell Automation 1794-ASB AB 1794 ASB 1794ASB Remote I/O adapter FLEX I/O RIO adapter 1794-ASB 1794-ASB Series E interface
Technical notes
The central risk for 1794-ASB is recreating the wrong Remote I/O rack identity. Preserve switch positions, rack and starting group, baud rate, scanner and processor catalog, block-transfer requirements, module order, termination value, and the 640 mA FLEXBus calculation before disturbing the station.
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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.
Why are switch photographs essential before removing 1794-ASB?
The switches encode rack address, starting group, baud rate, and station choices that must agree with the Remote I/O scanner configuration and controller program.
Which processor limitation must be checked before selecting 1794-ASB?
Rockwell documentation states that the adapter is not for Classic PLC-5/15 or PLC-5/25 processors, so identify the actual host and scanner first.
How can an incorrect baud setting on 1794-ASB present during startup?
The adapter may fail to communicate with a healthy cable and scanner; compare all segment devices with the selected 57.6, 115.2, or 230.4 Kbps rate.
When does the termination resistor at 1794-ASB need special attention?
If the station occupies a physical segment end, retain the scanner-specified 82 or 150 ohm termination and verify conductor polarity, shield, and connector condition.
Why can analog modules behind 1794-ASB remain inactive after discrete I/O recovers?
Analog and specialty modules can depend on block-transfer instructions, data files, rack mapping, and exact module order that must be restored in the controller program.
What should a procurement record include for discontinued 1794-ASB?
Include the full catalog and Series E marking, switch evidence, processor and scanner catalogs, rack map, baud rate, termination, module list, and condition requirements.