Allen-Bradley 1794-IA8
Allen-Bradley 1794-IA8
Allen-Bradley 1794-IA8
Allen-Bradley 1794-IA8
Allen-Bradley 1794-IA8
Allen-Bradley 1794-IA8
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1794-IA8

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Allen-Bradley 1794-IA8 is an eight-point 120 V AC FLEX I/O input module for receiving nonisolated field signals through a compatible terminal base.
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Technical specifications for 1794-IA8

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1794-IA8
  • Product Family:
    Flex I/O
  • Product Type:
    FLEX I/O Eight-Point 120 V AC Digital Input Module
  • Stock:
    1
  • Input Points:
    8, one nonisolated group
  • Input Type:
    120 V AC sinking input
  • On-State Voltage Range:
    65…132 V AC
  • Nominal Input Current:
    12 mA at 120 V AC
  • Maximum Off-State Voltage:
    43 V AC
  • Nominal Input Impedance:
    10.6 kΩ
  • Input Filter:
    Selectable
  • Compatible Terminal Bases:
    1794-TB2, 1794-TB3, 1794-TB3S, or 1794-TBN
  • FLEXBUS Current:
    30 mA at 5 V DC
  • Operating Temperature:
    -20…55 °C
  • Dimensions:
    9.4 × 4.6 × 5.3 cm
  • Weight:
    0.1 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 Input Circuit Filter Selection Base and Wiring Application
  • Eight 120 V AC field inputs for FLEX I/O distributed stations
  • One nonisolated sinking-input group with eight channel indicators
  • Selectable input filtering for response-time and noise-rejection requirements

1794-IA8 brings a group of eight AC field inputs into a distributed FLEX I/O station without consuming a chassis slot.

Its selectable filtering helps the control system balance response time against rejection of short AC input transitions.

Plan the terminal-base choice, keyswitch, 120 V AC field circuit, input grouping, and enclosure environment as one installation.

Availability, condition, price, and shipping time for 1794-IA8 are confirmed during quotation.

Allen-Bradley 1794-IA8 FLEX I/O Eight-Point 120 V AC Digital 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.

  • Eight 120 V AC inputs operate as one nonisolated field group.
  • Each channel reports its on or off state through the FLEX I/O adapter.
  • The common field circuit must suit the installed AC signal sources.
  • Selectable filtering controls how long an AC transition must persist before recognition.
  • Use the original project value when replacing a configured module.
  • Investigate field noise and wiring before increasing filter time to mask unstable signals.
  • Mount the module on a documented 1794 terminal base with keyswitch position 8.
  • Remove hazardous power before connecting or separating field conductors.
  • Preserve terminal numbering, common wiring, grounding, and station slot order.
  • Acquisition of compatible 120 V AC switch and contact states in distributed FLEX I/O stations.
  • Monitoring of eight grouped AC field signals through a FLEX I/O network adapter.
  • Machine or process input collection where selectable AC input filtering is required.
Description
Allen-Bradley 1794-IA8 provides eight nonisolated 120 V AC input points in one FLEX I/O field group.

The module accepts 65…132 V AC on-state signals, reports input status to the adapter across FLEXBUS, and provides selectable input filtering for supported FLEX I/O configurations.

Use a compatible terminal base and confirm field voltage, keyswitch position, filter selection, grounding, channel wiring, and adapter configuration before installation or replacement.
Revisions

Revision Part #

Also known as

1794-IA8 Ser A
1794-IA8/A, Series A, Rev A
Alternative Names
1794-IA8 1794IA8 1794 IA8 Allen-Bradley 1794-IA8 Allen Bradley 1794-IA8 AB 1794-IA8 Rockwell Automation 1794-IA8
Technical notes
1794-IA8 requires a compatible FLEX I/O terminal base and 120 V AC field wiring; verify keyswitch position, filtering, grounding, channel grouping, and saved adapter configuration before replacement.
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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.
Can Allen-Bradley 1794-IA8 be installed without changing the existing PLC program?
A like-for-like replacement may retain the program when the catalog number, slot, terminal base, keying, input image, filter setting, and adapter configuration all match. Back up and verify the project before returning the station to service.
What should be checked if Allen-Bradley 1794-IA8 inputs remain on after field devices switch off?
Check field-device leakage, induced voltage, neutral and return wiring, terminal condition, grounding, channel assignment, and the configured input filter. Test the circuit safely before concluding that the module has failed.
What should be checked before replacing Allen-Bradley 1794-IA8 in an operating FLEX I/O station?
Record the terminal base, keyswitch, channel wiring, filter setting, field voltage, slot order, adapter configuration, and grounding, and remove hazardous power before separating the module from its base.
Why can Allen-Bradley 1794-IA8 show unstable input status after installation?
Check AC field voltage, return wiring, terminal tightness, induced noise, grounding, and the configured input filter; short transitions can appear differently when the filter selection changes.
How can Allen-Bradley 1794-IA8 be commissioned without unexpectedly starting machinery?
Keep affected equipment in a safe state, verify the saved input map, test one field device at a time, monitor controller logic, and obtain authorization before restoring automatic operation.
Can Allen-Bradley 1794-IA8 be removed without disturbing field wiring?
The removable FLEX I/O module separates from its terminal base, but power must be made safe and the replacement must match the original keyswitch and base before reseating.
What information helps confirm an Allen-Bradley 1794-IA8 replacement?
Provide the complete catalog number, hardware series, terminal-base catalog number, station adapter, field voltage, keyswitch position, and a photo of the installed wiring and label.

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