1756-IF8
1756-IF8
1756-IF8
1756-IF8
1756-IF8
1756-IF8
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1756-IF8

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Allen-Bradley 1756-IF8 is a ControlLogix analog input module configurable for eight single-ended, four differential, or two high-speed differential channels.
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Technical specifications for 1756-IF8

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-IF8
  • Product Family:
    ControlLogix
  • Product Type:
    ControlLogix 8-Channel Analog Input Module
  • Stock:
    1
  • Channel configurations:
    8 single-ended; 4 differential; 2 high-speed differential
  • Input ranges:
    ±10 V; 0...10 V; 0...5 V; 0...20 mA
  • Resolution:
    16 bit; 15 bit plus sign for bipolar range
  • Data formats:
    Integer and IEEE 32-bit floating point
  • Conversion method:
    Sigma-Delta
  • Onboard data alarming:
    Yes
  • Scaling to engineering units:
    Yes
  • Isolation:
    250 V inputs-to-backplane; no channel-to-channel isolation
  • Backplane draw:
    200 mA at 5.1 V DC; 30 mA at 24 V DC
  • Removable terminal block:
    1756-TBCH or 1756-TBS6H
  • Weight:
    0.22 kg
  • Estimated shipping dimensions:
    3.5x14.2x14.5cm
  • Tariff Code:
    Please confirm the destination before shipping
  • 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 Modes Signal Quality Scaling & Alarms Product Applications

Features:

  • Flexible channel count: eight single-ended, four differential, or two high-speed differential inputs
  • Four signal ranges: current and unipolar or bipolar voltage modes are available
  • Controller-ready data: scaling, alarming, and integer or floating-point formats support application use
1756-IF8 suits mixed analog measurements when the project deliberately selects channel mode, electrical range, and data representation.

Because individual inputs are not isolated, field references and shielding have direct influence on multi-channel measurement quality.

A traceable commissioning record joins loop diagrams, RTB terminals, range settings, raw values, scaled units, alarms, and known test signals.

Availability of 1756-IF8 is subject to Apter Power inventory and sourcing confirmation.
Allen-Bradley 1756-IF8 ControlLogix 8-Channel 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.
  • Single-ended: allocate as many as eight channels within the shared reference design.
  • Differential: pair terminals correctly for four normal-speed differential inputs.
  • High speed: reserve the documented pairs when two fast differential channels are required.
  • Current mode: preserve the official jumper and return arrangement for loop signals.
  • Reference: compare transmitter commons before combining sources.
  • Shielding: retain the approved termination and cable route.
  • Filter: align notch and digital filtering with the process bandwidth.
  • Known source: apply traceable values at the RTB before condemning the module.
  • Range: verify the configured voltage or current span.
  • Raw data: record integer or floating-point behavior used by the project.
  • Scaling: compare low, midpoint, and high values in engineering units.
  • Alarm path: exercise process limits and open-circuit behavior under an approved test.
  • Process measurement: acquire supported transmitter current signals.
  • Voltage sensing: read conditioned unipolar or bipolar analog sources.
  • Machine feedback: return analog position, pressure, level, or similar conditioned values to ControlLogix.
Description
1756-IF8 measures supported voltage and current signals through eight single-ended, four differential, or two high-speed differential channels. Its ranges include ±10 V, 0...10 V, 0...5 V, and 0...20 mA.

The nonisolated channels of 1756-IF8 share an analog reference domain even though the inputs are isolated from the backplane. Channel mode, wiring, current-loop returns, shielding, and the 36-position RTB must therefore be reviewed as one measurement design.

Signal validation for 1756-IF8 should compare known terminal values with raw data, engineering scaling, alarms, filter choices, and controller sampling. This distinguishes a source or grounding problem from an analog conversion problem.
Revisions

Revision Part #

Also known as

1756-IF8 Series B
1756-IF8/B, Series B
Alternative Names
Allen-Bradley 1756-IF8 analog input Rockwell Automation 1756-IF8 AB 1756 IF8 1756IF8 current voltage input ControlLogix eight-channel analog input 1756-IF8 1756-IF8 Series B module
Technical notes
The key boundary for 1756-IF8 is its shared nonisolated channel domain. Match single-ended or differential mode, current-loop jumpers, signal reference, shield path, RTB, range, scaling, and filter settings before installation.
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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.
When should 1756-IF8 use differential inputs instead of single-ended inputs?
Choose differential wiring when the approved source and reference design benefit from paired measurement terminals; compare channel count, signal reference, speed, noise, and the official wiring diagrams.
Why can several readings on 1756-IF8 shift after one new transmitter is connected?
The channels are not isolated from one another, so an added loop reference or ground path can disturb the shared analog domain. Inspect commons, shielding, and loop supplies.
How should current-loop jumpers be verified on 1756-IF8?
Match every jumper and iRTN connection to the official current wiring diagram, then inject a known current and compare terminal, raw, and scaled values.
What can make an alarm on 1756-IF8 disagree with the measured process value?
A wrong range, scaling endpoints, data format, alarm threshold, filter, or controller tag can produce a plausible measurement with incorrect alarm behavior.
Which RTB must be matched when replacing 1756-IF8?
Confirm the 36-position 1756-TBCH or 1756-TBS6H, its terminal assignments, mechanical keying, shield connections, and current-loop jumpers.
What commissioning evidence is useful for 1756-IF8?
Record known low, midpoint, and high signals for every configured range together with raw data, engineering values, alarms, channel mode, and cross-channel stability.

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