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1794-IF8IH

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Allen-Bradley 1794-IF8IH combines eight isolated 0...20 mA or 4...20 mA inputs with HART data access for FLEX I/O process instrumentation.
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Technical specifications for 1794-IF8IH

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1794-IF8IH
  • Product Family:
    Flex I/O
  • Product Type:
    FLEX I/O 8-Channel Isolated HART Analog Input Module
  • Stock:
    1
  • Analog inputs:
    8 individually isolated current channels
  • Input ranges:
    0...20 mA or 4...20 mA
  • HART interface:
    Cyclic variables and pass-through messaging
  • Resolution:
    16 bits unipolar; 15 bits plus sign bipolar
  • Terminal base:
    1794-TB3 or 1794-TB3S
  • User power:
    24 V DC nominal
  • Channel isolation:
    120 V continuous
  • Operating temperature:
    0...55 °C
  • Enclosure:
    Open style
  • Estimated shipping dimensions:
    9.4 x 9.4 x 6.6 cm
  • Tariff Code:
    8537101190
  • Country of origin:
    Mexico
  • 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 HART Setup Status Check Loop Integrity Product Applications

Features:

  • Eight isolated loops: current measurement with channel-to-channel separation
  • HART device data: cyclic variables, status, and pass-through access
  • Configurable conversion: selectable response and rejection behavior
1794-IF8IH brings conventional analog current and digital transmitter information into the same FLEX I/O station.

Its practical value is improved device visibility without removing the primary measurement path from service.

The loop schedule should preserve channel format, HART settings, adapter context, terminal base, and commissioning evidence.

Apter Power can coordinate official-document review, quotation, and sourcing support for 1794-IF8IH.
1794-IF8IH FLEX I/O 8-Channel Isolated HART Analog Input 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.
  • Analog first: prove the current loop before enabling additional HART exchanges.
  • Data layout: match byte order and channel format before interpreting device variables.
  • Pass-through: use only the documented command path and supported adapter conditions.
  • Flashing green: check zero configuration, user power, and configuration mode.
  • Diagnostic image: compare module and channel words before disturbing field wiring.
  • Red indication: follow the official reset and hardware-check sequence.
  • Terminal base: use the documented 1794-TB3 or 1794-TB3S assignments.
  • Shielding: keep each field shield and return consistent with the loop drawing.
  • Isolation boundary: preserve the official channel and system insulation limits.
  • Smart transmitters: collect analog measurement and HART status from process instruments.
  • Maintenance access: retrieve documented device information without removing the loop.
  • Distributed process I/O: separate eight current channels in a FLEX I/O station.
Description
1794-IF8IH is an eight-channel FLEX I/O analog input module that combines individually isolated current inputs with HART device communication. It links field transmitters to a supported FLEX I/O adapter through a documented 1794 terminal base.

Alongside the primary current measurement, 1794-IF8IH returns HART variables and device status and supports pass-through access for additional information. Channel conversion settings let the engineer balance update response with the rejection behavior required by the process measurement.

A 1794-IF8IH installation should be released only after the terminal map, user power, data format, adapter support, and HART scan strategy are verified with the actual transmitter loops. The module is open-style equipment and must use the enclosure provisions stated by Rockwell Automation.
Revisions

Revision Part #

Also known as

1794-IF8IH Series A
1794-IF8IH/A, Series A
Alternative Names
4Allen-Bradley FLEX I/O IF8IH Rockwell 1794 IF8IH HART Input 1794IF8IH isolated analog input FLEX I/O eight-channel HART module
Technical notes
A flashing green indicator on 1794-IF8IH does not automatically identify a failed transmitter. Rockwell also associates that state with an all-zero configuration, missing 24 V DC user power, or configuration mode; verify those three conditions and the adapter data image before opening a field loop.
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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 can valid current data from 1794-IF8IH coexist with missing HART variables?
The loop can be electrically correct while HART command enablement, data format, scan configuration, adapter support, or the field device mode is still incorrect.
What should be checked when every 1794-IF8IH channel stops updating at once?
Start with module and user power, adapter communication, configuration state, and the common data image before treating eight separate transmitters as simultaneous failures.
How can 1794-IF8IH pass-through work be performed without disrupting the process value?
Verify the analog loop is stable, use the documented message path, avoid unsupported command sequences, and monitor channel status while retrieving device information.
Why might one 1794-IF8IH loop become noisy after cabinet work?
Inspect shield termination, routing near switching conductors, terminal seating, return wiring, field-device grounding, and whether the channel format or conversion rate was changed.
When should a different conversion setting be tested on 1794-IF8IH?
Change it only when the application needs a different response or rejection tradeoff, then compare representative process steps and noise before accepting the new setting.
What evidence should accompany a 1794-IF8IH sourcing request?
Provide complete nameplates, Series, adapter and firmware context, terminal-base requirement, loop type, condition photos, quantity, destination, and required date.