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1756-IV32

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Allen-Bradley 1756-IV32 is a ControlLogix 32-point 12/24 V DC sourcing digital input module used to bring field input signals into a ControlLogix system for monitoring, logic processing, and industrial control.
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Technical specifications for 1756-IV32

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-IV32
  • Product Family:
    ControlLogix
  • Product Type:
    ControlLogix 32 Pt 12/24VDC D/I Module
  • Stock:
    2
  • Inputs:
    32 (16 points/group)
  • Voltage category:
    12/24V DC source
  • Operating voltage range:
    10…30V DC
  • Input voltage, nom:
    24V DC
  • Current draw @ 5.1V:
    120 mA
  • Current draw @ 24V:
    2 mA
  • Total backplane power:
    0.66 W
  • Power dissipation, max:
    4.1 W @ 60 °C (140 °F)
  • Thermal dissipation:
    14 BTU/hr @ 60 °C (140 °F)
  • Off-state voltage, max:
    5V
  • Off-state current, max:
    1.5 mA
  • On-state current, min:
    2 mA @ 10V DC
  • On-state current, max:
    3.5 mA @ 30V DC
  • Inrush current, max:
    250 mA (decaying to <37% in 22 ms, without activation)
  • Input impedance, max:
    8.6 kΩ @ 30V DC
  • Cyclic update time:
    200 µs…750 ms
  • Change of state:
    Software configurable
  • Time stamp of inputs:
    ±200 µs
  • Isolation voltage:
    250V (continuous), basic insulation type, inputs-to-backplane, and input group-to-group; No isolation between individual group inputs.
  • Module keying:
    Electronic, software configurable
  • Removable terminal block:
    1756-TBCH, 1756-TBS6H
  • Temperature, operating:
    0…60 °C (32…140 °F)
  • Temperature, nonoperating:
    -40…+85 °C (-40…+185 °F)
  • Relative humidity:
    5…95% noncondensing
  • Vibration:
    2 g @ 10…500 Hz
  • Weight:
    0.14 kg
  • Estimated shipping dimensions:
    3.5x13x14.5cm
  • Tariff Code:
    8538109000
  • 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 Specifications Application Scenarios Control Firmware

Features:

  • Provides 32 sourcing digital inputs in two 16-point groups for compact ControlLogix signal acquisition.
  • Supports configurable update timing, change of state operation, and input time stamping for flexible event monitoring.
  • Offers group-to-group isolation, electronic keying, and compatibility with 1756-TBCH and 1756-TBS6H terminal blocks.
Allen-Bradley 1756-IV32 gives ControlLogix users a practical way to collect a large number of DC discrete signals without spreading inputs across several modules. With 32 points available in one module, equipment builders and plant engineers can simplify rack organization while maintaining clear separation between two 16-point groups. The 10 to 30 V DC operating range matches common industrial control voltage levels. Such capability is useful in machinery, process systems, material handling equipment, and other installations that depend on frequent status feedback from field devices.

Fast and configurable signal handling gives the module flexibility across different control tasks. Cyclic input updates can be set from 200 microseconds to 750 milliseconds, while software-configurable change of state operation allows the system to react to important input transitions without relying only on periodic updates. Time stamping with plus or minus 200 microsecond accuracy also provides useful event timing data. In applications involving sequencing, machine status, alarms, or coordinated process steps, these functions can improve visibility into when field conditions change.

Allen-Bradley 1756-IV32 is also built around the electrical and environmental requirements of ControlLogix installations. Backplane consumption remains low at 0.66 W, while maximum module power dissipation reaches 4.1 W at 60 degrees C. The specified operating temperature range of 0 to 60 degrees C, storage range of minus 40 to plus 85 degrees C, noncondensing humidity range of 5 to 95 percent, and 2 g vibration rating support dependable use in industrial control cabinets. Compatibility with removable terminal blocks and software-configurable electronic keying further supports installation, replacement, and maintenance throughout the system lifecycle.

The 1756-IV32 Allen-Bradley ControlLogix 32 Pt 12/24VDC D/I Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen-Bradley 1756-IV32 ControlLogix 32 Pt 12/24VDC D/I Module Manuals,Datasheets,Link 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.
Allen-Bradley 1756-IV32 ControlLogix 32 Pt 12/24VDC D/I Module Specs

General

  • Manufacturer Allen-Bradley
  • Model 1756-IV32
  • Condition New Original ready stock
  • Product Family 1756-IV32K,1756-IV16K,1756-IV16
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.
  • Discrete Assembly: Suitable for centralized signal acquisition of massive proximity switches, photoelectric sensors, and limit switches in automotive manufacturing and electronic assembly lines.
  • Logic Interlocking: Used for centralized management of hardware safety chain feedback, control cabinet buttons, and multi-position status monitoring in large and complex control systems.
  • High-Density Deployment: In field applications with limited control cabinet space, its high-density architecture with 32 points per module significantly reduces the occupancy of local or remote I/O slots.
  • Warehousing and Logistics: Suitable for real-time allocation and monitoring of high-frequency, high-concurrency signals from multiple sensors in large-scale sorting conveyor belts and automated intelligent warehouses.
  • Input Type: The channels adopt a source input design; external devices need to provide sinking control signals.
  • Filtering Configuration: The hardware debounce time for each input channel can be independently adjusted via software between 0 and 30 milliseconds.
  • Change Detection: Supports COS (Change of State) triggering, allowing the channel to instantly activate a backplane interrupt upon detecting a signal transition.
  • Diagnostic Latching: Provides input state latching logic to ensure accurate capture of short pulse edge signals even with long PLC scan cycles.
  • Version Update: The hardware supports online firmware updates via ControlFlash software to obtain the latest stable control logic and system patches.
  • Compatibility Cycle: The firmware supports low-level data mapping with different versions of RSLogix 5000 or Studio 5000 programming environments.
  • Status Self-Check: The module firmware has a built-in low-level power-on self-test (POST) program that can automatically identify backplane communication anomalies and lock the fault status.
  • Communication Synchronization: The internal firmware supports microsecond-level high-precision clock synchronization (CIP Sync) for multi-channel data acquisition via the ControlLogix backplane.
Description
Allen-Bradley 1756-IV32 provides 32 sourcing digital inputs arranged as two groups of 16 points, making it suitable for applications that require a high number of discrete field signals in a single ControlLogix module. The module uses a 12/24 V DC source voltage category and operates across a 10 to 30 V DC range, with 24 V DC as the nominal input voltage. Current draw is 120 mA at 5.1 V and 2 mA at 24 V, while total backplane power is 0.66 W. These electrical characteristics allow the module to integrate directly into ControlLogix racks while handling standard industrial DC input devices.

Allen-Bradley 1756-IV32 supports off-state and on-state signal recognition across its specified operating range. Maximum off-state voltage is 5 V with maximum off-state current of 1.5 mA, while on-state current ranges from 2 mA at 10 V DC to 3.5 mA at 30 V DC. Maximum input impedance is 8.6 kOhm at 30 V DC, and maximum inrush current is 250 mA, decaying to less than 37 percent within 22 ms without activation. These characteristics provide defined switching thresholds for reliable sensing of field devices connected to the input channels.

Allen-Bradley 1756-IV32 offers a cyclic update time from 200 microseconds to 750 milliseconds and supports software-configurable change of state operation. Input time stamping is specified at plus or minus 200 microseconds, giving the controller useful timing information for applications where input events must be tracked more precisely. Communication can be used in direct-connect or rack-optimized arrangements, depending on the ControlLogix system configuration. Electronic module keying is also software configurable, supporting controlled module identification during system setup and maintenance.

Allen-Bradley 1756-IV32 uses 250 V continuous basic insulation between the inputs and backplane and between input groups, while individual inputs within the same group are not isolated from one another. Compatible removable terminal blocks include 1756-TBCH and 1756-TBS6H. Maximum power dissipation is 4.1 W at 60 degrees C, with thermal dissipation of 14 BTU per hour at the same temperature. The module operates from 0 to 60 degrees C, stores from minus 40 to plus 85 degrees C, supports 5 to 95 percent noncondensing relative humidity, and withstands 2 g vibration from 10 to 500 Hz.
Revisions

Revision Part #

Also known as

1756-IV32 Ser A
1756-IV32/A, Series A, Rev A
Alternative Names
1756-1V32 17561V32 1756IV32 I756-1V32 1756-IV32K 1756-IV16K 1756-IV16 1756-IH16I
Technical notes
Engineered for time-critical automation, the 1756-IV32 digital input module features customizable input filter times from 0 to 30ms and reliable Change-of-State (COS) diagnostics. It serves as an essential interface for capturing high-speed sensor transitions in heavy-duty manufacturing and processing networks.
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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.
What does Allen-Bradley 1756-IV32 do in a ControlLogix system?
Allen-Bradley 1756-IV32 receives up to 32 discrete 12/24 V DC sourcing input signals and transfers their status to the ControlLogix controller for monitoring and logic processing.
How many input channels does Allen-Bradley 1756-IV32 provide?
Allen-Bradley 1756-IV32 provides 32 digital inputs divided into two groups of 16 points.
Can Allen-Bradley 1756-IV32 detect changes in input status quickly?
Yes. The cyclic update time can be configured from 200 microseconds to 750 milliseconds, and change of state operation can also be configured through software.
Does Allen-Bradley 1756-IV32 support input time stamping?
Input time stamping is supported with an accuracy of plus or minus 200 microseconds, which can assist applications that require more detailed input event timing.
What terminal blocks work with Allen-Bradley 1756-IV32?
Compatible removable terminal blocks include 1756-TBCH and 1756-TBS6H.

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