The Allen-Bradley 1756-IF6I, also cataloged as the 1756IF6I Analog Input Module, operates as a dedicated hardware component for multi-range voltage and current signal conversion within ControlLogix system backplane environments.

Input Architecture & Signal Conversion

• Primary Catalog Code: 1756-IF6I
• Alternate Catalog Identifier: 1756IF6I
• System Series: ControlLogix
• Channel Density: 6 Individually Isolated Channels
• Conversion Topology: Sigma-Delta Analog-to-Digital Converter
• Data Representation: Integer Mode (left-justified, 2s complement) or IEEE 32-bit Floating Point

Technical Specifications & Hardware Attributes

Deterministic Ethernet & Backplane Bus Performance

The 1756-IF6I digitizes multi-channel process signals and transfers binary array data over the ControlLogix chassis backplane. High backplane bus communication velocity preserves time-synchronized loop processing across EtherNet/IP deterministic networks, ensuring precise I/O density scaling and maintaining firmware flash compatibility with Studio 5000 Logix Designer project environments.

Assembly Package Contents

• 1 x Allen-Bradley 1756-IF6I ControlLogix Analog Input Card
• 1 x System Wiring Diagram & Quick Start Leaflet

Field Wiring Rules & Physical Installation

• Slot Insertion Procedure: Slide the circuit card assembly into any available chassis slot until internal backplane connectors seat completely and locking tabs snap closed.
• Current/Voltage Termination Setup: Wire loop transmitters to designated terminal blocks, utilizing internal precision shunts for 0-21 mA current configuration.
• Shield Grounding Method: Terminate signal cable drain wires at a single enclosure ground bar to prevent ground loops across isolated channels.

Frequently Asked Questions

• Q: What input signal ranges can be configured on the 1756-IF6I card?

  Channels accept voltage signals of +/-10.5 V, 0-10.5 V, and 0-5.25 V, as well as current signals of 0-21 mA.

• Q: What ADC conversion method does the 1756-IF6I module utilize?

  The analog input circuit utilizes Sigma-Delta A/D conversion with 16-bit digital resolution.

• Q: What backplane currents are drawn by the 1756-IF6I during operation?

  The module draws 250 mA from the 5 VDC backplane rail and 100 mA from the 24 VDC rail.

• Q: What data formats does the module output to the controller?

  Data is formatted either as Integer mode (left-justified, 2s complement) or IEEE 32-bit floating point.

• Q: What is the maximum power dissipation for current mode operation?

  In current input mode, the maximum thermal power dissipation of the hardware reaches 4.3 W.

• Q: Are channels individually isolated from each other on the 1756-IF6I?

  Yes, the module features 6 input channels with individual channel-to-channel galvanically isolated paths.

• Q: What resolution is achieved when operating in the 0-21 mA range?

  When configured for 0-21 mA, the module delivers an analog resolution of approximately 0.34 uA per bit.

• Q: Does the module support insertion into an active chassis under power?

  Yes, ControlLogix hardware supports Removal and Insertion Under Power (RIUP) in non-hazardous locations.