Allen-Bradley 1756-IF4FXOF2F ControlLogix High-Speed Analog I/O Module

The 1756-IF4FXOF2F is a high-speed, combination analog input/output module from Allen-Bradley, part of the ControlLogix series. This module features four differential, sub-millisecond analog inputs and two high-speed voltage or current outputs. It is designed to support a wide range of input and output signal types, including voltage and current signals. The 1756-IF4FXOF2F is used in applications requiring high-speed signal processing and accurate analog control, including process control, automation, and industrial measurements.

Technical Specifications

• Part Number: 1756-IF4FXOF2F
• Series: ControlLogix
• Manufacturer: Rockwell Automation (Allen-Bradley)
• Module Type: High-Speed Analog Input/Output Module

Inputs

• Number of Inputs: 4 high-speed differential inputs
• Signal Ranges:
  • ±10V
  • 0 to 10V
  • 0 to 5V
  • 0 to 20 mA
• Input Resolution:
  • 14 bits for ±10.5V DC
  • 12 bits for 21 mA
• Overrange Indication: Available for each input channel
• Input Conversion Method: Successive Approximation
• Repeatability: ±1 Least Significant Bit (LSB)
• Calibration Interval: 12 months

Outputs

• Number of Outputs: 2 high-speed voltage or current outputs
• Signal Ranges:
  • ±10V
  • 0 to 20 mA
• Output Resolution:
  • 13 bits for current (2.8 µA/bit)
  • 14 bits for voltage (1.3 mV/bit)
• Output Conversion Method: R-Ladder DAC (no missing codes)
• Short-Circuit Protection: Electronically current-limited to 21 mA
• Overvoltage Protection: 24V DC (for output only)

Power and Thermal

• Backplane Current:
  • 375 mA at 5V
  • 100 mA at 24V
• Power Dissipation (Max):
  • 4.3 Watts (Voltage Output)
  • 4.7 Watts (Current Output)
• Thermal Dissipation:
  • 14.66 BTU/hr (Voltage)
  • 16.02 BTU/hr (Current)
• Operating Temperature: 0 to 60°C (Standard Operating Range)

Connectivity

• Required Terminal Blocks: 1756-TBS6H or 1756-TBCH removable terminal blocks
• Update Period: 300 µs (sub-millisecond channel scan time)
• Overvoltage Protection for Inputs: 30V DC
• Overvoltage Protection for Outputs: 24V DC
• Open Circuit Detection: Yes (within 1 second for inputs)

Applications

The 1756-IF4FXOF2F is suitable for applications where precise analog control is required, such as:

• Flow and level control
• Pressure and temperature monitoring
• Speed, viscosity, and pH measurement
• Control of modulating valves, drives, and transducers

Physical Specifications

• Weight: 2.00 lbs
• Module Compatibility: Requires 1756 ControlLogix chassis