Allen Bradley 1794-IF4I Analog Input Module

The AB 1794-IF4I is a FLEX I/O analog input module with four isolated input channels, designed to measure both current and voltage signals in distributed industrial control systems. Supporting ±10V and 0–20mA input ranges with 12-bit resolution, this module is ideal for precision analog signal acquisition in compact control environments.

Each channel on the 1794-IF4I is individually isolated, providing excellent signal integrity and noise immunity in environments with mixed analog and digital devices. Compatible with a variety of FLEX I/O terminal bases, it integrates seamlessly with Rockwell’s modular I/O architecture.

Technical Specifications

Model: 1794IF4I
Series: FLEX I/O
Type: Analog Input Module
Input Channels: 4 isolated analog inputs
Input Signal Types: ±10 V, 0–20 mA (selectable per channel)
Resolution: 12-bit
Terminal Base Compatibility: TB2, TB3, TB3S, TB3T, TB3TS, TBN
Application: Scalable analog input for distributed control

Electrical Specifications

Input Ranges:
• Voltage: ±10 V
• Current: 0–20 mA

Input Impedance:
• Voltage: >200 kΩ
• Current: 250 Ω

Update Rate: 4 ms per channel
Accuracy: ±0.1% full scale typical
Channel Isolation: Yes, channel-to-channel and channel-to-backplane
Backplane Current (5V): Approx. 50 mA
Backplane Current (24V): Approx. 60 mA
Analog Outputs: 0
Cold Junction Compensation: Not applicable

Mechanical Specifications

Width: 94 mm
Height: 46 mm
Depth: 53 mm
Mounting Type: DIN rail (via terminal base)
Front Installation: No – installs into base
Connection Type: Screw terminals via compatible base
Weight: Approx. 130 g
Form Factor: FLEX I/O plug-in module

Environmental Specifications

Operating Temperature: 0…55 °C
Storage Temperature: –40…85 °C
Relative Humidity: 5% to 95% non-condensing
Shock Resistance: 30 g, 11 ms (IEC 60068-2-27)
Vibration Resistance: 2 g, 10–500 Hz (IEC 60068-2-6)
Pollution Degree: 2
Altitude Limit: Up to 2000 m
Certifications: CE, UL, cULus, FM, ATEX (with certified base)

Compliance & Communication

Network Protocols: Depends on installed FLEX adapter (not integrated in module)
Data Format: Scaled integer
I/O Mapping: Configurable in Studio 5000 / RSLogix
Diagnostic Features: Channel status, fault detection
System Integration: FLEX I/O distributed system
Field Isolation: Yes – per channel

Key Features & Benefits

✅ 4 Isolated Analog Inputs – Individually isolated channels for voltage or current input

✅ Selectable Input Ranges – Flexibility to handle 0–20 mA or ±10 V signals on each channel

✅ High Signal Integrity – Reduced electrical noise through channel isolation

✅ DIN Rail Mount via FLEX Base – Seamless integration with FLEX I/O terminal blocks

✅ Compact & Scalable – Ideal for distributed analog sensing in modular automation systems

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