Product Overview

The Allen-Bradley 1756-IF6I is an isolated analog input module for ControlLogix systems. This module has 6 individually isolated input channels. It accepts voltage and current signals. Supported ranges include ±10.5V, 0-10.5V, 0-5.25V, and 0-21mA. Resolution is 16 bits across all channels. The module uses Sigma-Delta conversion for high accuracy. This product is discontinued, so stock is limited.

For inquiries, contact us at +86 158 8020 0923 (WhatsApp).

Part Number Breakdown (Tree Structure)

• 1756 → Series Family
  • ControlLogix platform
  • Allen-Bradley / Rockwell Automation
• IF → Product Type
  • Analog Input Module
• 6 → Channel Count
  • 6 input channels
• I → Special Feature
  • Isolated channels

Key Specifications

• Brand: Allen-Bradley / Rockwell Automation
• Part Number: Allen-Bradley 1756-IF6I
• Series: ControlLogix
• Module Type: Analog Input Module
• Number of Inputs: 6 points, individually isolated
• Conversion Method: Sigma-Delta
• Input Signal Ranges: ±10.5V, 0-10.5V, 0-5.25V, 0-21mA
• Resolution: 16 bits
• Data Formats: Integer mode (left justified, 2's complement) or IEEE 32-bit floating point
• Product Lifecycle: Discontinued / Obsolete

Input Range and Resolution Details

• ±10.5V: 343 µV per bit
• 0 to 10.5V: 171 µV per bit
• 0 to 5.25V: 86 µV per bit
• 0 to 21mA: 0.34 µA per bit

User Counts for Each Range

• ±10.5V: -10.54688V to +10.54688V
• 0-10.5V: 0V to 10.54688V
• 0-5.25V: 0V to 5.27344V
• 0-21mA: 0mA to 21.09376mA

Power Consumption

• Backplane Current (5 Volts): 250 mA
• Backplane Current (24 Volts): 100 mA
• Power Dissipation (Voltage Mode): 3.7 W maximum
• Power Dissipation (Current Mode): 4.3 W maximum

Compatible Removable Terminal Blocks (RTB)

• 1756-TBNH (screw terminal, 20-pin)
• 1756-TBSH (spring clamp, 20-pin)
• Module requires RTB for field wiring connections.

Signal Quality and Diagnostic Features

• Under-range/Over-range Detection: Activates when input exceeds configured limits
• Wire Off Detection: Triggers when wire disconnects or RTB removes
• Rate Alarm: Monitors rate of change between input samples (floating-point mode)
• Process Alarms: Triggers when high or low limits exceed per channel
• Digital Filter: Smooths input data noise transients on each channel
• Notch Filter: Removes line noise; choose closest match to anticipated noise frequency

Real-Time Sampling (RTS)

• Configure RPI (Requested Packet Interval) period.
• Configure RTS (Real-Time Sampling) period.
• Module scans input channels and collects all available data.
• Module multicasts data after scanning.

Scaling and Data Formats

• Supports scaling to engineering units.
• Provides readable data for HMI and SCADA systems.
• Scaled inputs used for arithmetic instructions and PID algorithms.
• Choose between integer mode and floating-point mode.

Typical Process Variables Measured

• Pressure
• Level
• Temperature
• Flow
• Speed
• % Travel
• Viscosity
• Turbidity
• Vibration

Compatible Field Instruments

• Transmitters (2-wire and 4-wire)
• Transducers
• Indicators
• Strain gauges
• Displacers
• Potentiometers

Installation Guide

• Turn off all power before installation.
• Install compatible RTB (1756-TBNH or 1756-TBSH) on the module.
• Insert the Allen-Bradley 1756-IF6I into any ControlLogix chassis slot.
• Press firmly until the module seats in the backplane.
• Secure the module with retaining screws.
• Connect field devices to RTB terminals.
• Configure input range per channel in Studio 5000.
• Set RPI and RTS periods for each channel.
• Choose appropriate notch filter for noise rejection.
• Apply power and check module status LED.

Maintenance Tips

• Check LED indicators for fault conditions.
• Monitor wire-off detection for disconnected sensors.
• Verify process alarms for out-of-range signals.
• Inspect RTB connections for tightness annually.
• Keep module free from dust and moisture.
• Replace module if inputs fail consistently.

Typical Applications

• Process control with 4-20mA transmitters
• Pressure and temperature monitoring
• Flow measurement systems
• Level control in tanks and vessels
• Vibration monitoring for rotating machinery
• SCADA system analog input integration
• PID control loop process variable input

Package Contents

• One Allen-Bradley 1756-IF6I analog input module
• Removable terminal block not included (order separately)
• One product label

Warranty and Shipping

• 12 months factory warranty from shipment date.
• Warranty covers manufacturing defects only.
• Overvoltage or wrong wiring voids warranty.
• Shipping options: FedEx, UPS, DHL.
• Tracking number provided after shipment.

Frequently Asked Questions (FAQ)

Q1: How many input channels does the 1756-IF6I have?

The Allen-Bradley 1756-IF6I has 6 analog input channels. Each channel is individually isolated. This prevents ground loops between different input signals.

Q2: What signal ranges does this module support?

This module supports ±10.5V, 0-10.5V, 0-5.25V, and 0-21mA ranges. You configure each channel independently. Resolution varies by range from 86 µV to 343 µV per bit.

Q3: What RTB works with the 1756-IF6I?

Use 1756-TBNH (screw terminal) or 1756-TBSH (spring clamp) RTB. Both are 20-pin types. Order the RTB separately if you do not have one.

Q4: Does the 1756-IF6I have diagnostic features?

Yes, this module has under-range/over-range detection, wire-off detection, rate alarms, and process alarms. It also has digital and notch filters for noise rejection.

Q5: Is the 1756-IF6I still in production?

No, this module is discontinued and obsolete. We have limited new and original stock available. Order soon for replacement needs in existing systems.

Buying Guide

When you buy a Allen-Bradley 1756-IF6I analog input module, follow these tips. First, count your analog input needs. This module gives 6 isolated channels. Second, verify your signal type and range. Choose between voltage and current ranges. Third, order compatible RTB. Use 1756-TBNH or 1756-TBSH. Fourth, consider your noise environment. Use notch filters to reject line noise. Fifth, calculate your power budget. Module draws 250 mA at 5V and 100 mA at 24V. Sixth, set RPI and RTS periods appropriately. Seventh, configure process alarms for critical channels. Eighth, check discontinued status. Order spares while available. Ninth, review warranty terms. We offer 12 months coverage. Tenth, choose your shipping method. We use FedEx, UPS, and DHL. Finally, test each channel with a signal simulator before connecting field devices.

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