Allen-Bradley 1794-IB8
Allen-Bradley 1794-IB8
Allen-Bradley 1794-IB8
Allen-Bradley 1794-IB8
Allen-Bradley 1794-IB8
Allen-Bradley 1794-IB8
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1794-IB8

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Allen-Bradley 1794-IB8 is an eight-point FLEX I/O current-sinking digital input module for receiving 24 V DC signals from compatible sourcing field devices.
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Technical specifications for 1794-IB8

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1794-IB8
  • Product Family:
    Flex I/O
  • Product Type:
    FLEX I/O 8-Point 24 V DC Sinking Digital Input Module
  • Stock:
    1
  • Number of Inputs:
    8, current, sinking
  • Nominal Input Voltage:
    24 V DC
  • On-State Voltage:
    10 to 31.2 V DC
  • On-State Current:
    2.0 to 12.0 mA; 8.0 mA nominal
  • Off-State Voltage:
    5.0 V DC maximum
  • Off-State Current:
    1.5 mA maximum
  • Nominal Input Impedance:
    4.6 kΩ
  • Input Filter:
    0.25 ms default; selectable 0.5, 1, 2, 4, 8, 16, or 32 ms
  • Isolation:
    50 V continuous, basic insulation, field side to system
  • Isolation Type Test:
    850 V DC for 60 seconds
  • FlexBus Current:
    20 mA at 5 V DC
  • External DC Supply:
    24 V DC nominal; 10 to 31.2 V DC including 5% AC ripple
  • Power Dissipation:
    3.5 W maximum at 31.2 V DC
  • Thermal Dissipation:
    11.9 BTU/hr maximum at 31.2 V DC
  • Status Indicators:
    8 yellow input-status indicators
  • Terminal Base Keyswitch:
    Position 2
  • Operating Temperature:
    -20 to +55 °C
  • Storage Temperature:
    -40 to +85 °C
  • Relative Humidity:
    5 to 95%, noncondensing
  • Vibration:
    5 g at 10 to 500 Hz
  • Operating Shock:
    30 g
  • Nonoperating Shock:
    50 g
  • Tariff Code:
    8537101190
  • 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 Signal Wiring Input Filtering Installation Application
  • Accepts eight current-sinking 24 V DC inputs from compatible sourcing field devices
  • Provides selectable input filtering from 0.25 ms to 32 ms for inputs 0 through 7
  • Mounts on a compatible 1794 terminal base with the mechanical keyswitch set to position 2

Allen-Bradley 1794-IB8 is a Series A FLEX I/O module that converts eight field-side DC input states into controller input data.

It is intended for sourcing field devices and provides local status indication, configurable filtering, and field-to-system electrical isolation.

For a replacement, confirm the exact catalog number, terminal base, keyswitch position, field-power polarity, filter configuration, enclosure, and approvals before returning the point group to service.

Availability, condition, price, and shipping time for Allen-Bradley 1794-IB8 are confirmed during quotation.

Allen-Bradley 1794-IB8 FLEX I/O Digital Input Module Manuals, Product Family, 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.

  • Inputs 0 through 7 accept current from compatible two-wire or three-wire sourcing field devices
  • The field-power positive and common connections must follow the selected 1794 terminal-base diagram
  • The eight input channels share the field-side arrangement and do not provide channel-to-channel isolation
  • The default input-filter time is 0.25 ms for inputs 0 through 7
  • The configurable alternatives are 0.5, 1, 2, 4, 8, 16, and 32 ms
  • Longer filter times reject more brief transients but increase the minimum pulse duration that can be detected
  • Install the 1794 terminal base on a grounded DIN rail and set its keyswitch to position 2
  • Use an open-style indoor enclosure suitable for Pollution Degree 2, Overvoltage Category II, and the installation environment
  • Do not remove or replace the terminal base under power; apply the hazardous-location precautions in the official instructions
  • Push-button contact inputs in FLEX I/O distributed control stations
  • Limit-switch state inputs for machine-position and travel monitoring
  • Relay-contact status inputs for discrete equipment and interlock feedback
Description
Allen-Bradley 1794-IB8 is a Series A FLEX I/O digital input module with eight current-sinking channels for nominal 24 V DC field signals.

The module accepts compatible two-wire or three-wire sourcing field devices, provides eight yellow input-status indicators, and supports selectable input filtering from 0.25 ms to 32 ms. Its 50 V continuous isolation rating applies between the field side and the system; the individual input channels are not isolated from one another.

Before installation or replacement, verify Series A compatibility, the selected 1794 terminal base, keyswitch position 2, sensor polarity, field-power wiring, input-filter configuration, enclosure requirements, and the approvals shown on the actual product label.
Revisions

Revision Part #

Also known as

1794-IB8 Ser A
1794-IB8/A, Series A, Rev A
Alternative Names
1794-IB8 1794IB8 1794 IB8 AB 1794-IB8 Allen-Bradley 1794-IB8 FLEX I/O 1794-IB8
Technical notes
Allen-Bradley 1794-IB8 is a Series A FLEX I/O sinking input module. Match the terminal base, keyswitch, sensor polarity, filter setting, and safety approvals.
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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.
Does Allen-Bradley 1794-IB8 include the terminal base required for installation?
No. The 1794-IB8 is the removable input module; the terminal base is a separate item unless the quotation explicitly includes it. Rockwell Automation lists 1794-TB3, 1794-TB3S, 1794-TB3K, 1794-TB3SK, 1794-TBKD, and 1794-TB37DS as recommended bases.
Why must field devices connected to Allen-Bradley 1794-IB8 provide sourcing outputs?
The 1794-IB8 inputs sink current, so the connected sensor or contact circuit must source positive DC current into the selected input. Rockwell Automation provides separate wiring arrangements for compatible two-wire and three-wire sourcing devices.
Can Allen-Bradley 1794-IB8 be removed while the FLEX I/O backplane remains powered?
FLEX I/O modules can be removed or inserted under backplane power without disturbing field wiring, but the terminal base must not be removed under power. In hazardous locations, de-energize the field circuit or confirm that the area is nonhazardous before disconnecting wiring or equipment.
Why must the terminal-base keyswitch be set to position 2 for Allen-Bradley 1794-IB8?
Position 2 is the published mechanical key setting for the 1794-IB8. It helps prevent the wrong FLEX I/O module type from being inserted into a wired terminal base and should be confirmed before the module is seated.
How can the Allen-Bradley 1794-IB8 input filter affect a short field pulse?
The default filter is 0.25 ms and can be increased to 0.5, 1, 2, 4, 8, 16, or 32 ms. A longer setting rejects more short transients but may also prevent a legitimate brief pulse from reaching the controller, so match it to the signal duration and control task.
What does “no channel-to-channel isolation” mean for Allen-Bradley 1794-IB8 wiring?
The published 50 V continuous isolation applies between the field side and the system, not between individual inputs. Do not treat the eight channels as separately isolated circuits; use the terminal-base common and field-power arrangement shown in the installation instructions.
Why can an Allen-Bradley 1794-IB8 input remain active after a two-wire sensor switches off?
Some two-wire sensors continue passing leakage current in the OFF state. Measure the residual current at the terminal base, verify polarity and common wiring, and confirm the sensor’s leakage rating meets the 1794-IB8 input requirements.

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