Allen-Bradley 1756-IF8I

ControlLogix 8 Point Isolated Analog Input Module

Allen-Bradley 1756-IF8I ControlLogix 8 Point Analog Input, Rockwell Automation product photo

Image is for illustrative purposes only. Please refer to product description.

Delivery options

Allen-Bradley 1756-IF8I ControlLogix analog input module: eight isolated points for voltage, current or sourcing current, 24 bit resolution, one slot.

Manufacturer: Allen-Bradley
Manufacturer part no.: 1756-IF8I
Product family: ControlLogix I/O Modules (1756)
Type: Analog input module
Category: PLCs and I/O › Analogue I/O modules
Lifecycle: Active
OEM successor: Not stated
Technical datasheet: Data sheet

Technical specifications

Manufacturer: Allen-Bradley
Manufacturer part no.: 1756-IF8I
Type: Analog input module
Application: I/O module
Used with: ControlLogix 1756 chassis
Display: Module Health, In Calibration,Mode, Input, Fault and,Communication Status
Input Signal: -10…10V, 0…10V, 0…5V, 0G
Isolation: 250V (continuous), reinforced,insulation type, inputs to,backplane. 250V (continuous),basic insulation type, input,to input
Special Features: Per Point Isolation
Analogue inputs configurable: Yes
Calibrated accuracy: 0.05% @ 25°C (77 °F)
Channel bandwidth: Notch Filter configuration dependent
Common mode noise rejection: 120 dB @ 50/60 Hz
Conducted RF immunity: 10V rms with 1 kHz sine wave 80% AM from 150 kHz...80 MHz on shielded signal ports
Current draw: 200mA @ 5.1V, Voltage/Non-sourcing current mode: 150mA @ 24V, Sourcing current mode: 400mA @ 24V (In sourcing current mode, the channel provides loop power.)
Data format: IEEE 32-bit floating point
EFT/B immunity: ±4kV @ 5kHz on shielded signal ports
Emissions: IEC 61000-6-4
Enclosure type rating: None (open-style)
ESD immunity: 6 kV contact discharges, 8 kV air discharges
Input, current: Yes
Input impedance: Voltage mode: 1 GΩ approximately (powered), Voltage mode: 7500 Ω approximately (unpowered), Current mode: 125 Ω approximately
Input range: -10...10V, 0…10V @ 0...5V, 0...20 mA
Inputs: Eight isolated channels - any combination of voltage or current mode
Input signal, configurable: Yes
Input, voltage: Yes
Isolation voltage: 250V (continuous), reinforced insulation type, inputs to backplane, 250V (continuous), basic insulation type, input to input
Module conversion method: Sigma-Delta
Module error over full temperature range: 0.1 %
Module input scan time, min: 1 ms

Show all 56 specifications

Module keying: Electronic, software configurable
Normal mode noise rejection: 80 dB @ 60 Hz
Onboard data alarming: Yes
Open circuit detection time: 5 s
Operating temperature: 0 to 60 °C
Overvoltage protection: ±30V DC maximum
Power dissipation: Voltage mode: 4.6 W (15.7 BTU/hr), Non-sourcing current mode: 5.1 W (17.4 BTU/hr), Sourcing current mode: 7.3 W (24.9 BTU/hr)
Radiated RF immunity: 10 V/m with 1 kHz sine-wave 80% AM from 80...2000 MHz, 10 V/m with 200 Hz 50% pulse 100% AM @ 900 MHz, 10 V/m with 200 Hz 50% pulse 100% AM @ 1890 MHz, 3 V/m with 1 kHz sine-wave 80% AM from 2000...2700 MHz
Real-time channel sampling: Yes
Relative humidity: 5...95% noncondensing
Resolution: 24 bit, ±10.5V (1.49 µV/count), 0...10.5V (1.49 µV/count), 0...5.25V (1.49 µV/count), 0...21 mA (2.99 nA/count)
RTB keying: User-defined mechanical
Scaling to engineering units: Yes
Settling time: Notch Filter configuration dependent
Shock: Operating: 30 G, Non operating: 50 G
Slot width: 1
Sourcing current, max: Current limited <45 mA (IN_x/I/SRC to RTN_x)
Sourcing voltage, max: 36V DC (open circuit)
Sourcing voltage, min: 20V DC
Surge transient immunity: ±2 kV line-earth (CM) on shielded signal ports
Thermal dissipation: Voltage mode: 15.7 BTU/hr, Non-sourcing current mode: 17.4 BTU/hr, Sourcing current mode: 24.9 BTU/hr
Total backplane power: Voltage/Non-sourcing current mode: 4.6 W, Sourcing current mode: 10.6 W
Vibration: 2 G @ 10...500 Hz
Voltage and current ratings: Backplane: 5.1V DC 200mA @ 24V DC 400 mA, Input voltage: -10V to +10V @ 0V to 10V @ 0V to 5V, Input current: 0 mA to 20 mA, Output current: 0 mA to 20 mA
Wire category: 2 - on signal ports
Wire size: 0.33...2.1 mm² (22...14 AWG) solid or stranded shielded copper wire rated at 90 °C (194 °F), or greater, 1.2 mm (3/64 in.) insulation maximum

Technical documents (1)

Rockwell Automation technical data 1756-TD002

Key features

Eight isolated channels, any mix of voltage or current
Sigma-Delta conversion with 24 bit resolution
Sourcing current mode provides loop power on the channel
Electronic keying, software configurable
Onboard data alarming and scaling to engineering units

About the Allen-Bradley 1756-IF8I

The 1756-IF8I is a ControlLogix analog input module with 8 isolated points for current, current sourcing and voltage. Calibrated accuracy is 0.05% at 25 °C, resolution is 24 bit, and data is in IEEE 32-bit floating point format. It is 1 slot wide and works from 0 to 60 °C.

What is the 1756-IF8I used for?

It brings field analog signals into a ControlLogix system, each of the eight channels set to voltage or current mode, with ranges of -10...10V, 0...10V, 0...5V and 0...20 mA. In sourcing current mode the channel provides loop power, so two-wire transmitters need no separate supply. It also scales to engineering units and offers onboard data alarming.

Lifecycle and successor

Active (Rockwell Automation lifecycle status, checked 24 October 2026).

Before you order

What to photograph or confirm so the right unit is quoted.

Read the catalog number 1756-IF8I, the series letter and the firmware revision from the label. Send us a photo of the label and we confirm the match before we quote.

Other parts in the Allen-Bradley ControlLogix I/O Modules family

Listed for reference. They differ from the 1756-IF8I in rating, supply, interface or function and are not interchangeable with it unless Allen-Bradley says so. Match the part number on your unit.

Product	Type	Lifecycle	Qty Available	Price	Action
Allen-Bradley 1756-IA16ControlLogix 16 Point 120V AC Input Module	Digital input module	Active	On request	On request	View
Allen-Bradley 1756-IB16ControlLogix 16 Point 12/24V DC Input Module	Digital input module	Active	On request	On request	View
Allen-Bradley 1756-IB16IControlLogix 16 Point Isolated 24V DC Input Module	Digital input module	Active	On request	On request	View
Allen-Bradley 1756-IB16SControl Logix Safety IO Module, 16 Sinking Inputs	Digital input module	Active	On request	On request	View
Allen-Bradley 1756-IB32ControlLogix 32 Point 12/24V DC Input Module	Digital input module	Active	On request	On request	View
Allen-Bradley 1756-IF16ControlLogix 16 Point Analog Input Module	Analog input module	Active	On request	On request	View
Allen-Bradley 1756-IF16HControlLogix 16 Point HART Analog Input Module	Analog input module	Active	On request	On request	View
Allen-Bradley 1756-IF6IControlLogix 6 Point Isolated Analogue Input Module	Analog input module	Discontinued	On request	On request	View
Allen-Bradley 1756-IF8ControlLogix 8 Point A/I Module	Analog input module	Active	On request	On request	View
Allen-Bradley 1756-IRT8IControlLogix 8 Point RTD/Thermocouple Input Module	Analog input module	Active	On request	On request	View
Allen-Bradley 1756-OA16ControlLogix 16 Point 74-265 VAC Output Module	Digital output module	Active	On request	On request	View
Allen-Bradley 1756-OA16IControlLogix 16 Point Isolated AC Output Module	Digital output module	Active	On request	On request	View

You may also be interested in

TimControls is an independent distributor. Manufacturer names and logos are the property of their respective owners and identify products we source; they do not imply manufacturer authorization or affiliation.

Need Allen-Bradley 1756-IF8I? Send us the details.

Request a Quote