Allen-Bradley 1756-IF8I ControlLogix 8-Point Isolated Analog Input Module

Allen-Bradley 1756-IF8I ControlLogix 8-Point Isolated Analog Input Module

Price range: $1,580.07 through $2,035.77

The Allen-Bradley 1756-IF8I is an 8-point individually channel-isolated analog input module providing high-resolution signal conversion and galvanic isolation for process transmitters. It accepts voltage (±10V) and current (0–20 mA / 4–20 mA) inputs across eight independently isolated channels, protecting measurement accuracy from ground loops and electrical interference. Advanced digital filtering and high A/D conversion resolution allow it to deliver precise process variable data to ControlLogix controllers. Equipped with channel-level status diagnostics, it supports Removal and Insertion Under Power (RIUP) for streamlined, live maintenance.

$1,580.07
$2,035.77
SKU: 1756-IF8I Category: Brand:

Description

  • Part Number: 1756-IF8I
  • Manufacturer: Allen-Bradley
  • Type: 8-Point Isolated Analog Input Module
  • Series: ControlLogix 1756 Series
  • Application: Isolated Industrial Analog Sensor Telemetry
  • Size // Rating: 8 Isolated Channels, 24-Bit Resolution
  • Connection Type: 36-Pin Removable Terminal Block (RTB)
  • Compatibility: Allen-Bradley ControlLogix 1756 System

TCI is not an authorized Allen-Bradley distributor.

Warranty Coverage

This product is backed by a TCI Supply 1 year Warranty.

Industrial Repair Services

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Description

The Allen-Bradley 1756-IF8I is a high-performance analog input module engineered for demanding process automation environments within the ControlLogix 1756 framework. Featuring eight individually isolated input channels, it translates continuous field signals from pressure transmitters, flow meters, temperature transducers, and analytical instruments into digital values for the system controller.

Galvanic channel-to-channel isolation sets the 1756-IF8I apart, making it the ideal choice for installations spanning large physical areas or complex electrical configurations. By isolating each input path, the card eliminates ground loops, reduces common-mode electrical noise, and prevents signal degradation caused by distinct power supplies or floating earth potentials. Each channel can be independently configured for either voltage or current modes via Studio 5000 or RSLogix 5000 software.

The module utilizes a 36-pin Removable Terminal Block (1756-TBCH or 1756-TBS6H) to accommodate the higher wiring density associated with isolated signal routing. Integrators can customize digital filtering, scaling limits, and rate-of-change alarms on a per-channel basis. Supporting Removal and Insertion Under Power (RIUP), the 1756-IF8I enables technicians to replace or service hardware live without disrupting adjacent I/O modules or taking the main chassis offline.

Frequently Asked Questions

What is the primary function of the Allen-Bradley 1756-IF8I module?

The 1756-IF8I converts continuous analog voltage or current signals from field transmitters into digital data for ControlLogix controllers with point-to-point channel isolation.

What input ranges does the 1756-IF8I support?

It supports software-configurable voltage ranges of ±10V DC, 0–5V DC, 0–10V DC, and 1–5V DC, as well as current input ranges of 0–20 mA and 4–20 mA DC.

What is the benefit of individual channel isolation on the 1756-IF8I?

Channel-to-channel isolation eliminates ground loop interference, cancels common-mode voltage spikes, and allows transmitters on separate ground references or power feeds to connect to the same card.

Which Removable Terminal Block (RTB) is required for the 1756-IF8I?

Due to its isolated wiring requirement, it uses a 36-pin RTB, such as the 1756-TBCH (cage clamp) or 1756-TBS6H (spring clamp).

What is the main difference between the 1756-IF8 and the 1756-IF8I?

The standard 1756-IF8 uses non-isolated/group-common channels, whereas the 1756-IF8I provides true galvanic isolation between individual channels.

Can each channel on the 1756-IF8I be configured independently?

Yes. Each channel can be individually configured for different input signal types (voltage vs. current), digital filtering, and alarm thresholds in the programming software.

Does the 1756-IF8I support Removal and Insertion Under Power (RIUP)?

Yes. Technicians can safely insert or remove the 1756-IF8I from an active ControlLogix chassis without shutting down chassis power.

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