Allen‑Bradley 1756‑IF8I ControlLogix 8‑Point Individually‑Isolated Analog Input Module (36‑Pin)
Allen‑Bradley 1756‑IF8I ControlLogix 8‑Point Individually‑Isolated Analog Input Module (36‑Pin) - Image 2
Allen‑Bradley 1756‑IF8I ControlLogix 8‑Point Individually‑Isolated Analog Input Module (36‑Pin) - Image 3

Allen‑Bradley 1756‑IF8I ControlLogix 8‑Point Individually‑Isolated Analog Input Module (36‑Pin)

  1. 1756‑IF8 (8‑point analog input, non‑isolated)Rockwell A…
  2. 1756‑IF8IK (Conformal‑coated version of 1756‑IF8I)Rockwell A…
  3. 1756‑IF8IH (8‑ch isolated analog input with HART support)Rockwell A…
  4. 1756‑OF8I (8‑point individually‑isolated analog output module)Rockwell A…
  5. 1756‑IRT8I (8‑ch isolated RTD / thermocouple temperature input)Rockwell A…
  6. 1756‑TBCH (36‑pin screw terminal block)
  7. 1756‑L30ER (CompactLogix controller for reference)

 

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Description

Allen‑Bradley 1756‑IF8I ControlLogix 8‑Point Individually‑Isolated Analog Input Module (36‑Pin)

 

Product Details

1756‑IF8I is high‑performance isolated analog input I/O module for Rockwell ControlLogix platform. Origin: Multiple origins. Lifecycle status: Active, current production, original new available, standard factory warranty 1‑yearRockwell A…. Suffix I = per‑channel isolation.

  • Channels: 8 channels, each channel individually galvanically isolatedRockwell A…
  • Input ranges (software configurable per‑channel, mixed voltage/current): Voltage：‑10…10V, 0…10V, 0…5V Current：0‑20 mA (supports 2‑wire transmitter loop‑power sourcing)Rockwell A…
  • ADC: 24‑bit Sigma‑Delta converter, IEEE 32‑bit floating‑point output data formatRockwell A…
  • Isolation rating: 250V continuous reinforced insulation (channel‑to‑backplane); 250V basic insulation channel‑to‑channelRockwell A…
  • Accuracy: 0.05% at 25℃; full‑range total error ≤0.1%Rockwell A…
  • Backplane load：200 mA @5.1VDC; 150‑400 mA @24VDC (depends on sourcing‑current mode)Rockwell A…
  • Minimum scan time：1 ms; open‑circuit detection for 4‑20 mA loop (5 s response)Rockwell A…
  • Termination: 36‑pin connector, compatible with 1756‑TBCH / 1756‑TBS6H terminal blocks, screw/spring‑clamp wiring supportRockwell A…
  • Operating temperature：0℃ ~ +60℃, IP20 (cabinet‑only installation)
  • Variant: 1756‑IF8IK: conformal coated PCB for corrosive / high‑humidity plant environmentRockwell A…

Note: Not HART‑capable; select 1756‑IF8IH for HART‑enabled isolated analog inputRockwell A…. Requires Logix Designer V21 or above firmware compatibility.

 

Applications

‑ Petrochemical, power‑plant ControlLogix process‑control systems ‑ Isolated acquisition of pressure, flow, level transmitters (4‑20 mA / ±10V) ‑ Sites with high ground‑loop noise risk, requires channel‑by‑channel galvanic isolation ‑ Water‑treatment, pharmaceutical, metallurgy heavy‑industry automation ‑ Retrofit & spare‑part replacement for existing ControlLogix racks ‑ Spare inventory for industrial automation maintenance department

1756-IF8I

Related Series Models (6+)

  1. 1756‑IF8 (8‑point analog input, non‑isolated)Rockwell A…
  2. 1756‑IF8IK (Conformal‑coated version of 1756‑IF8I)Rockwell A…
  3. 1756‑IF8IH (8‑ch isolated analog input with HART support)Rockwell A…
  4. 1756‑OF8I (8‑point individually‑isolated analog output module)Rockwell A…
  5. 1756‑IRT8I (8‑ch isolated RTD / thermocouple temperature input)Rockwell A…
  6. 1756‑TBCH (36‑pin screw terminal block)
  7. 1756‑L30ER (CompactLogix controller for reference)

 

Key Features

  1. Eight fully individually‑isolated analog input channels, suppress ground‑loop interference between field transmitters and PLC backplaneRockwell A….
  2. Per‑channel software configuration, freely mix voltage / current / 2‑wire loop‑powered transmitters, no hardware jumpers requiredRockwell A….
  3. High‑precision 24‑bit Sigma‑Delta ADC, excellent noise rejection performance (CMRR 120 dB @50/60Hz)Rockwell A….
  4. Built‑in open‑circuit fault detection for current loops, per‑channel LED status indication for fast on‑site troubleshootingRockwell A….
  5. Hot‑swap capable, can be replaced while chassis powered without system shutdown.
  6. Conformal‑coated variant (1756‑IF8IK) available for corrosive plant cabinet environmentRockwell A….
  7. 32‑bit floating‑point engineering‑unit scaling onboard, reduces controller CPU computation load.
  8. Multi‑origin manufacturing; active‑lifecycle product, brand‑new original parts commercially available with 1‑year factory warrantyRockwell A….

 

Main Functions

  1. Convert field 4‑20 mA / 0‑10V analog transmitter signals into digital floating‑point data for ControlLogix CPU processing.
  2. Provide galvanic isolation for each channel to eliminate ground‑loop noise and cross‑channel interference.
  3. Supply loop‑power for 2‑wire field transmitters in current‑sourcing mode.
  4. Detect channel open‑circuit, over‑range fault conditions and report diagnostic alarms to Logix controller.
  5. Real‑time synchronized sampling under EtherNet/IP distributed I/O architecture.
  6. On‑board engineering‑unit scaling simplifies configuration for pressure, flow, level process variables.
  7. Cooperate with ControlLogix CPU, power supply and terminal assemblies to complete process‑variable acquisition.
  8. Serve as high‑reliability isolated analog signal acquisition unit inside ControlLogix automation rack.

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