1756-IF6I | Allen-Bradley ControlLogix Analog Input Module, Current/Voltage, 6 Pts
1756-IF6I | Allen-Bradley ControlLogix Analog Input Module, Current/Voltage, 6 Pts
1756-IF6I | Allen-Bradley ControlLogix Analog Input Module, Current/Voltage, 6 Pts
1756-IF6I | Allen-Bradley ControlLogix Analog Input Module, Current/Voltage, 6 Pts
1756-IF6I | Allen-Bradley ControlLogix Analog Input Module, Current/Voltage, 6 Pts
1756-IF6I | Allen-Bradley ControlLogix Analog Input Module, Current/Voltage, 6 Pts
1756-IF6I | Allen-Bradley ControlLogix Analog Input Module, Current/Voltage, 6 Pts
1756-IF6I | Allen-Bradley ControlLogix Analog Input Module, Current/Voltage, 6 Pts
1756-IF6I | Allen-Bradley ControlLogix Analog Input Module, Current/Voltage, 6 Pts
    1756-IF6I | Allen-Bradley ControlLogix Analog Input Module, Current/Voltage, 6 Pts
    1756-IF6I | Allen-Bradley ControlLogix Analog Input Module, Current/Voltage, 6 Pts
    1756-IF6I | Allen-Bradley ControlLogix Analog Input Module, Current/Voltage, 6 Pts
1756-IF6I | Allen-Bradley ControlLogix Analog Input Module, Current/Voltage, 6 Pts
1756-IF6I | Allen-Bradley ControlLogix Analog Input Module, Current/Voltage, 6 Pts
1756-IF6I | Allen-Bradley ControlLogix Analog Input Module, Current/Voltage, 6 Pts

1756-IF6I | Allen-Bradley ControlLogix Analog Input Module, Current/Voltage, 6 Pts

Part #: 1756-IF6I Manufactured by: Allen-Bradley
Regular price
$319.00
Sale price
$319.00
Regular price
32 in Stock
Condition: New-Surplus Original Box
Shipping calculated at checkout.
Product Overview
Allen Bradley 1756-IF6I ControlLogix Isolated Analog Input Module with 6-Point Isolated Inputs
We accept:
  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Venmo
  • Visa
warranty
IQElectro 2-Year Warranty
Warranty for Product #: 1756-IF6I
IQElectro offers a free 2-year warranty on all products. You can trust that every purchase is a reliable investment in the future of your company. Warranty Terms
2-3 Day Free Shipping
Packed Ready to Ship
24/7 Expert Support
Return within 30-Days
IQElectro LLC BBB Business Review
IQElectro is Not an authorized distributor for Allen-Bradley
Original Manufacturer's Warranty Not Covered, This Product is SURPLUS.

Product Description P/N: 1756-IF6I

Description / Specifications

Description 

The 1756-IF6I is a ControlLogix analog input module. It has 6 individually isolated Current and Voltage input channels compatible for input signal range of ±10.5V, 0 -10.5V, 0-5.25V and 0-21 mA. It has a resolution of 16 bits and compatible for interfacing with 2-Wire and 4-Wire signal transmitters.

 

Technical Specifications 

Brand Allen-Bradley
Manufacturer Rockwell Automation
Part Number/Catalog No. 1756-IF6I
Series ControlLogix
Module Type Analog Input
Inputs 6-Points, Isolated
Conversion Method Sigma-Delta
Data format Integer mode (left justified, 2 s complement) IEEE 32-bit floating point
Input signal Range ±10.5V, 0 -10.5V, 0-5.25V and 0-21 mA
Backplane Current (5Volts) 250 mA
Backplane Current (24Volts) 100 milliamps
Power Dissipation (Max) Voltage 3.7 W Current: 4.3 W
Removeable Terminal Blocks 1756-TBNH 1756-TBSH

  

 

Information About 1756-IF6I

The Allen-Bradley 1756-IF6I is an Isolated Analog Voltage/Current Input Module. It has Six (6) individually isolated inputs and is part of the ControlLogix system. This module requires either the 20-pin 1756-TBNH or 1756-TBSH Removable Terminal Block (RTB) before it can be wired with input signals. You can choose between two data formats for the 1756-IF6I: the integer mode and the floating-point mode. It has 16 significant bits and you can select which range to use for every channel on your module among the series of operational ranges. The available ranges and their respective resolutions are as follows: +/- 10.5 Volts has 343 ?Volt/count, 0 to 10.5V has 171 ?Volt/count, 0 to 5.25 Volts has 86 ?Volt/count, and 0 to 21 milliamps has 0.34 ?A/count. When the isolated input module is operating beyond the limits set by the input range, the under-range/over-range detection feature will be activated. Line noise in your application in each channel can be removed using the module’s analog-to-digital converter. Since each filter time affects the response time of your module and the highest frequency notch filter settings, limit the effective resolution of the channel. Remember to choose the notch filter that is the closest match to the anticipated noise frequency. A digital filter is also present and this smoothens out input data noise transients on each input channel.

Real-time sampling, or RTS, is another feature of the 1756-IF6I. When you configure a module, you need to set a requested packet interval (RPI) period and a real-time sampling (RTS) period. Once these parameters are set, the module will scan its input channels and collect all available data and after scanning, the module will then multicast the data. It also has a wire off detection feature that triggers when a wire has been disconnected from a channel or when an RTB has been removed from the module. Additionally, the 1756-IF6I is equipped with rate alarm for applications using the floating-point mode. This monitors the rate of change between input samples. Each channel exceeding the specified trigger point for that channel will produce an alarm. Process alarms are also present and are triggered when the module has exceeded its configured high or low limits for every channel.

The Allen-Bradley 1756-IF6I is a ControlLogix analog input module. This module has Six (6) individually isolated analog input channels. This module is designed to receive ±10.5V, 0 -10.5V, 0-5.25V and 0-21 mA with resolution of 16 bits. Each channel has built-in input signal quality detection for monitoring and reference of control with reference to the signal quality.

For a +/- 10VDC input, the minimum user count is 10.54688V and maximum user count of 10.54688V. Similarly, a 0-10VDC input has 0V- 10.54688V; 0-5VDC has 0V- 5.27344V; For 0-20mA has 0mA-21.09376V. These input signal range are converted by the analog input through the integrated analog to digital converter via Sigma-Delta conversion method. The actual resolution for each input signals are 343 ?V/bit for 10.5VDC, 171 ?V/bit for 0-10.5VDC; 86 ?V/bit for 0 to 5.25V and 0.34 ?A/bit for 0-21mA.

This module supports scaling to engineering units to provide a readable and usable user-data for use with Human Machine Interface (HMI) and Supervisory Control and Data Acquisition (SCADA). Aside for integration to computer-based monitoring and control systems, the scaled input is used by control logic such as arithmetic instruction or Proportional-Integral-Derivative (PID) algorithm as their Process Variable (PV) or Setpoint, depending on the control strategy implemented. The module also supports real-time data sampling with adjustable sampling times and On-board data alarming for self-diagnostics.

The Analog signals typically represent the magnitude of Process Variables (PV) such as Pressure, Level, Temperature, Flow, Speed, % Travel, Viscosity, Turbidity, Vibration and other Process Variables. Some instruments that produce analog signals are Transmitters, Transducers, Indicators, Strain-Gauges, displacers, potentiometers and other analog signaling instruments.



Manufacturer information

Allen-Bradley, a brand of Rockwell Automation, specializes in manufacturing industrial automation equipment. The product range includes programmable logic controllers (PLCs), motion control systems, safety devices, motor control equipment, automation software, and HMI panels. Allen-Bradley products are known for their reliability and integration with other systems.

Frequently Asked Questions about 1756-IF6I
Question: What is Allen-Bradley 1756-IF6I?
Date Update:26/05/2025
Answer:

The 1756-IF6I is a 6-channel, individually isolated analog input module designed for ControlLogix systems by Rockwell Automation. It supports current and voltage input ranges such as ±10.5V, 0–10.5V, 0–5.25V, and 0–21 mA. Each channel has high-resolution 16-bit conversion using a Sigma-Delta method. It is well-suited for precision applications requiring noise filtering, signal diagnostics, and advanced scaling.

Question: How is real-time sampling (RTS) used in the module?
Date Update:26/05/2025
Answer:

The 1756-IF6I supports Real-Time Sampling (RTS) and Requested Packet Interval (RPI). These parameters define how often input data is sampled and sent to the controller. Consistent RTS ensures stable data capture, which is critical for applications such as fast PID control. Proper tuning of these intervals improves control system responsiveness.

Question: Why does the 1756-IF6I clamp the analog signal at 17 mA during a 4–20 mA test?
Date Update:26/05/2025
Answer:

This issue likely stems from improper return wiring in isolated mode. Since each channel on the 1756-IF6I is electrically isolated, each input must have its own complete signal path — including a separate RTN (Return) connection. If returns are floating or incorrectly shared, the input may clamp early or read unstable values. You can try bonding all RTN terminals if your system supports a common ground, but ideally, each transmitter should be wired with its own return path. Always consult Rockwell documentation before altering isolation behavior.

Question: What are the module dimensions and how is it mounted?
Date Update:26/05/2025
Answer:

The 1756-IF6I has a standard ControlLogix form factor, measuring approximately 35 mm (W) × 145 mm (H) × 135 mm (D). It mounts directly into a 1756 chassis backplane, using rail guides and a secure locking mechanism. No tools are required for module installation. Proper ventilation is required to avoid thermal derating.

Question: Is the Allen-Bradley 1756-IF6I still in production?
Date Update:26/05/2025
Answer:

No, the Allen-Bradley 1756-IF6I has been discontinued by Rockwell Automation as of March 31, 2017. It is no longer available for sale and has been officially removed from the product catalog. Rockwell recommends reviewing system designs and replacing the module with a functional replacement available within the ControlLogix platform. Always refer to Rockwell's official lifecycle documents or consult a distributor for the most suitable alternative.

IQElectro is not an authorized distributor.
QElectro LLC (IQElectro) is NOT an Authorized Distributor or in any way affiliated with Rockwell Automation, Siemens, or any other Manufacturers. IQElectro is NOT an Authorized Dealer of this product. The product may be of older version, date codes, or design than that available from authorized dealers. As IQElectro is not an authorized dealer of this product, the Original Manufacturer's Warranty and Support DO NOT apply. IQElectro sells SURPLUS only and DOES NOT SELL SOFTWARE or FIRMWARE licenses For more detailed information, please refer to the full version of our disclaimer policy Disclaimer Policy.
Description / Specifications

Description 

The 1756-IF6I is a ControlLogix analog input module. It has 6 individually isolated Current and Voltage input channels compatible for input signal range of ±10.5V, 0 -10.5V, 0-5.25V and 0-21 mA. It has a resolution of 16 bits and compatible for interfacing with 2-Wire and 4-Wire signal transmitters.

 

Technical Specifications 

Brand Allen-Bradley
Manufacturer Rockwell Automation
Part Number/Catalog No. 1756-IF6I
Series ControlLogix
Module Type Analog Input
Inputs 6-Points, Isolated
Conversion Method Sigma-Delta
Data format Integer mode (left justified, 2 s complement) IEEE 32-bit floating point
Input signal Range ±10.5V, 0 -10.5V, 0-5.25V and 0-21 mA
Backplane Current (5Volts) 250 mA
Backplane Current (24Volts) 100 milliamps
Power Dissipation (Max) Voltage 3.7 W Current: 4.3 W
Removeable Terminal Blocks 1756-TBNH 1756-TBSH

  

 

Information About 1756-IF6I

The Allen-Bradley 1756-IF6I is an Isolated Analog Voltage/Current Input Module. It has Six (6) individually isolated inputs and is part of the ControlLogix system. This module requires either the 20-pin 1756-TBNH or 1756-TBSH Removable Terminal Block (RTB) before it can be wired with input signals. You can choose between two data formats for the 1756-IF6I: the integer mode and the floating-point mode. It has 16 significant bits and you can select which range to use for every channel on your module among the series of operational ranges. The available ranges and their respective resolutions are as follows: +/- 10.5 Volts has 343 ?Volt/count, 0 to 10.5V has 171 ?Volt/count, 0 to 5.25 Volts has 86 ?Volt/count, and 0 to 21 milliamps has 0.34 ?A/count. When the isolated input module is operating beyond the limits set by the input range, the under-range/over-range detection feature will be activated. Line noise in your application in each channel can be removed using the module’s analog-to-digital converter. Since each filter time affects the response time of your module and the highest frequency notch filter settings, limit the effective resolution of the channel. Remember to choose the notch filter that is the closest match to the anticipated noise frequency. A digital filter is also present and this smoothens out input data noise transients on each input channel.

Real-time sampling, or RTS, is another feature of the 1756-IF6I. When you configure a module, you need to set a requested packet interval (RPI) period and a real-time sampling (RTS) period. Once these parameters are set, the module will scan its input channels and collect all available data and after scanning, the module will then multicast the data. It also has a wire off detection feature that triggers when a wire has been disconnected from a channel or when an RTB has been removed from the module. Additionally, the 1756-IF6I is equipped with rate alarm for applications using the floating-point mode. This monitors the rate of change between input samples. Each channel exceeding the specified trigger point for that channel will produce an alarm. Process alarms are also present and are triggered when the module has exceeded its configured high or low limits for every channel.

The Allen-Bradley 1756-IF6I is a ControlLogix analog input module. This module has Six (6) individually isolated analog input channels. This module is designed to receive ±10.5V, 0 -10.5V, 0-5.25V and 0-21 mA with resolution of 16 bits. Each channel has built-in input signal quality detection for monitoring and reference of control with reference to the signal quality.

For a +/- 10VDC input, the minimum user count is 10.54688V and maximum user count of 10.54688V. Similarly, a 0-10VDC input has 0V- 10.54688V; 0-5VDC has 0V- 5.27344V; For 0-20mA has 0mA-21.09376V. These input signal range are converted by the analog input through the integrated analog to digital converter via Sigma-Delta conversion method. The actual resolution for each input signals are 343 ?V/bit for 10.5VDC, 171 ?V/bit for 0-10.5VDC; 86 ?V/bit for 0 to 5.25V and 0.34 ?A/bit for 0-21mA.

This module supports scaling to engineering units to provide a readable and usable user-data for use with Human Machine Interface (HMI) and Supervisory Control and Data Acquisition (SCADA). Aside for integration to computer-based monitoring and control systems, the scaled input is used by control logic such as arithmetic instruction or Proportional-Integral-Derivative (PID) algorithm as their Process Variable (PV) or Setpoint, depending on the control strategy implemented. The module also supports real-time data sampling with adjustable sampling times and On-board data alarming for self-diagnostics.

The Analog signals typically represent the magnitude of Process Variables (PV) such as Pressure, Level, Temperature, Flow, Speed, % Travel, Viscosity, Turbidity, Vibration and other Process Variables. Some instruments that produce analog signals are Transmitters, Transducers, Indicators, Strain-Gauges, displacers, potentiometers and other analog signaling instruments.



Manufacturer information

Allen-Bradley, a brand of Rockwell Automation, specializes in manufacturing industrial automation equipment. The product range includes programmable logic controllers (PLCs), motion control systems, safety devices, motor control equipment, automation software, and HMI panels. Allen-Bradley products are known for their reliability and integration with other systems.

Check Out These Related Products

Customer Reviews

Be the first to write a review
0%
(0)
0%
(0)
0%
(0)
0%
(0)
0%
(0)