1794-IF4I |Allen-Bradley | Flex I/O 4-Channel Isolated Analog Input Module

Product Description

The Allen-Bradley 1794-IF4I is a Flex I/O isolated analog input module designed for precise signal acquisition in distributed control systems. With four isolated input channels, high-resolution conversion, and robust isolation voltage, it ensures accurate measurement of current and voltage signals in demanding industrial environments. Its compact DIN rail mounting design and compatibility with multiple terminal bases make it a versatile choice for scalable automation architectures.

Key Features

• Manufacturer: Rockwell Automation

• Brand: Allen-Bradley

• Model Number: 1794-IF4I

• Series: Flex I/O 1794

• Type: Isolated Analog Input Module

• Number of Inputs: 4 isolated channels

• Supported Signal Types:

• Current: 0–20 mA, 4–20 mA, ±20 mA

• Voltage: ±10 VDC, 0–10 VDC, ±5 VDC, 0–5 VDC

• Resolution:

• 16-bit unipolar

• 15-bit plus sign bipolar

• Conversion Type: Sigma-Delta

• Conversion Accuracy:

• Current: 0.320 µA/count (unipolar), 0.640 µA/count (bipolar)

• Voltage: 0.156 mV/count (unipolar), 0.313 mV/count (bipolar)

• Terminal Base Compatibility: 1794-TB2, TB3, TB3S, TB3T, TB3TS, TBN

• External DC Supply: Nominal 24 VDC (range 19–31.2 VDC, including 5% AC ripple)

• FlexBus Current Draw: 50 mA

• Isolation Voltage: 120 V continuous

• Power Dissipation: 2.0 W max @ 31.2 VDC

• Thermal Dissipation: 6.8 BTU/hr max @ 31.2 VDC

• Mounting: DIN rail

• Operating Temperature: 0–55 °C (32–131 °F)

• Storage Temperature: –40–85 °C (–40–185 °F)

• Vibration Resistance: 5 g @ 10–500 Hz

• Shock Resistance: 30 g

• Weight: 0.31 lbs (≈ 0.14 kg)

Application Scenarios

• Process Control Systems: Accurate analog signal acquisition for monitoring and regulation

• Distributed Automation: Designed for Flex I/O systems with modular expansion capability

• High-Precision Measurement: 16-bit resolution ensures reliable data for critical applications

• Industrial Environments: Robust isolation and shock/vibration resistance for harsh conditions

FAQ

Q: How many input channels does the 1794-IF4I provide?  A: It supports 4 isolated analog input channels.

Q: What signal types are supported?  A: Current (0–20 mA, 4–20 mA, ±20 mA) and voltage (±10 VDC, 0–10 VDC, ±5 VDC, 0–5 VDC).

Q: What is the resolution of the module?  A: 16-bit unipolar and 15-bit plus sign bipolar.

Q: How does it compare to the 1794-IF4XOF2 module?  A: The 1794-IF4I provides isolated analog inputs only, while the 1794-IF4XOF2 combines analog inputs with analog outputs, offering mixed functionality.