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1756-IH16I

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Allen-Bradley 1756-IH16I is a 16-point individually isolated 125 V DC sinking or sourcing input module for high-voltage ControlLogix field-status circuits.
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Technical specifications for 1756-IH16I

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-IH16I
  • Product Family:
    ControlLogix
  • Product Type:
    ControlLogix 16-Point Individually Isolated 125 V DC Input Module
  • Stock:
    1
  • Inputs:
    16 individually isolated
  • Input type:
    125 V DC sink or source
  • Operating voltage:
    90 to 146 V DC
  • Nominal voltage:
    125 V DC
  • Off-to-on hardware delay:
    2 ms maximum
  • On-to-off hardware delay:
    6 ms maximum
  • Configurable input filters:
    0, 1, or 2 ms off-to-on; 0, 1, 2, 9, or 18 ms on-to-off
  • Cyclic requested packet interval:
    200 μs to 750 ms
  • Timestamp accuracy:
    ±200 μs
  • Off-state voltage:
    20 V maximum
  • Off-state current:
    0.8 mA maximum
  • On-state current:
    1 mA minimum at 90 V; 3 mA maximum at 146 V
  • Maximum inrush current:
    250 mA
  • Backplane current at 5.1 V DC:
    125 mA
  • Backplane current at 24 V DC:
    3 mA
  • Maximum power dissipation:
    5 W at 60°C
  • Isolation voltage:
    250 V continuous input-to-backplane and input-to-input
  • Compatible RTB:
    1756-TBCH or 1756-TBS6H
  • Operating temperature:
    0 to 60°C
  • Storage temperature:
    -40 to 85°C
  • Dimensions:
    3.6 × 14.3 × 14.5 cm
  • Weight:
    0.2 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 Voltage Class Input Timing Isolation Application
  • Provides sixteen isolated input channels for 125 V DC field signals
  • Supports both sinking and sourcing circuit arrangements
  • Offers configurable filters, change-of-state reporting, and timestamps

1756-IH16I addresses a voltage class that is materially different from common 24 V DC ControlLogix input modules. Its isolation and terminal practices should be treated as part of the product selection.

Response behavior is configurable. When servicing an existing rack, compare channel filters and controller timing before attributing a slower state change to the replacement hardware.

Before installation, verify 125 V DC field compatibility, channel polarity, the approved high-voltage RTB, isolation wiring, input filters, electronic keying, and the saved channel schedule.

Availability, condition, price, and shipping time for 1756-IH16I are confirmed during quotation.

Allen-Bradley 1756-IH16I ControlLogix 16-Point Individually Isolated 125 V DC 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.

  • Use only with documented 90 to 146 V DC field circuits
  • Confirm sink/source polarity before terminating each isolated channel
  • Do not substitute a 24/48 V DC input module based on chassis fit
  • Restore off-to-on and on-to-off filter selections
  • Coordinate change-of-state and cyclic updates with the controller task
  • Account for the configured filter when evaluating response time
  • Maintain the specified input-to-backplane isolation boundary
  • Preserve individual input-channel isolation in field wiring
  • Use the documented high-voltage RTB and conductor practice
  • Individually isolated monitoring of 125 V DC status circuits
  • High-voltage DC interlock and permissive inputs
  • ControlLogix field-status acquisition requiring channel-to-channel isolation
Description
1756-IH16I provides sixteen individually isolated ControlLogix inputs for 125 V DC field circuits.

The module supports sinking or sourcing operation across a documented 90 to 146 V DC range and offers configurable input filtering, change-of-state operation, and CST-based timestamps.

Installation planning should confirm field polarity, channel isolation, 1756-TBCH or 1756-TBS6H termination, high-voltage wiring practices, filter settings, electronic keying, and the saved controller project.
Revisions

Revision Part #

Also known as

1756-IH16I Ser A
1756-IH16I/A, Series A, Rev A
Alternative Names
1756-IH16I 1756-IH16I/A Allen-Bradley 1756-IH16I Allen Bradley 1756-IH16I Rockwell Automation 1756-IH16I
Technical notes
1756-IH16I replacement requires the 125 V DC field class, correct polarity, matching RTB, filters, keying, and channel schedule; a low-voltage look-alike creates a serious selection risk.
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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 1756-IH16I replace a low-voltage 24 V DC input module?
No. 1756-IH16I is designed for 125 V DC circuits with a documented 90 to 146 V DC operating range. The field-voltage class and wiring must match.
Does 1756-IH16I isolate every input from the other inputs?
Yes. Rockwell Automation documents sixteen individually isolated inputs and continuous isolation ratings from input to backplane and between input channels.
Which RTB should be ordered with 1756-IH16I?
Use the documented 1756-TBCH or 1756-TBS6H removable terminal block, selected for the project wiring method and installed according to the high-voltage terminal instructions.
Can the existing removable terminal block be reused with 1756-IH16I?
Only after confirming it is a supported 1756-TBCH or 1756-TBS6H and that terminal condition, channel assignment, polarity, conductor insulation, and high-voltage wiring remain correct.
Why might a replacement 1756-IH16I respond more slowly than the original?
Compare the configurable on/off filters, controller task timing, requested packet interval, and channel wiring. The filter selections can add delay beyond the hardware response.
Can 1756-IH16I replace a grouped 125 V DC input module without rewiring?
Not automatically. Its sixteen channels are individually isolated, so terminal allocation, commons, polarity, RTB type, and the original field-circuit arrangement must be compared before substitution.
What is the main selection risk with 1756-IH16I?
A module may fit the chassis while having the wrong voltage class, isolation requirement, RTB, or filter configuration. Verify the complete channel schedule before purchase.