Allen-Bradley 1794-IF8IH FLEX I/O Input Module | 8-Channel, 4-20mA/±20mA, 16-bit, Isolated Specs

Allen-Bradley 1794-IF8IH FLEX I/O Input Module | 8-Channel, 4-20mA/±20mA, 16-bit, Isolated Specs

Allen-Bradley 1794-IF8IH FLEX I/O analog input module specifications. 8-channel isolated analog input, 4-20mA/±20mA, 16-bit resolution, IP20. For industrial measurement and control.

Product Overview

The Allen-Bradley 1794-IF8IH​ is an 8-channel isolated analog input module​ from the FLEX I/O series, designed for industrial measurement and control applications. This module provides 8 isolated input channels​ supporting 4-20mA, 0-20mA, ±20mA, 0-21mA current signals, with 16-bit resolution, and connects to FLEX I/O adapter modules. The "1794" designation indicates the FLEX I/O module series, "IF8IH" specifies the 8-channel isolated analog input configuration. This module enables precise analog signal measurement for process variables in distributed I/O systems with individual channel isolation for noise immunity and fault tolerance.

Technical Specifications

Note: Specifications are based on Allen-Bradley 1794 series technical documentation. The "1794-IF8IH" model specifically indicates 8-channel isolated current input configuration. Actual specifications may vary slightly depending on production batch.

Model Number Decoding (1794-IF8IH)

• 1794:​ Series designation (FLEX I/O module series)

• IF8IH:​ Module type (IF = analog input, 8 = 8 channels, I = isolated, H = high-density)

Note:​ The "IF" prefix indicates analog input functionality. The "8" specifies 8 input channels. The "I" indicates isolated channels. The "H" suffix indicates high-density configuration. This module requires a 1794 FLEX I/O adapter (1794-AENT, 1794-ASB, etc.) and terminal base (1794-TB3G/TB3S) for operation.

Key Features

• 8 Isolated Channels:​ Eight individually isolated current input channels

• High Resolution:​ 16-bit resolution for precise measurement

• High Accuracy:​ ±0.05% of range accuracy

• Multiple Input Ranges:​ Configurable for 4-20mA, 0-20mA, ±20mA, 0-21mA

• Channel Isolation:​ 250V AC isolation between channels and backplane

• Open Wire Detection:​ Configurable detection for broken wire conditions

• Selectable Filtering:​ Programmable input filtering for noise immunity

• Status Indicators:​ LED status for module and channel health

• Removable Terminals:​ Terminal base allows easy wiring and maintenance

• High-Density Design:​ Eight channels in compact footprint

• Industrial Grade:​ Designed for harsh industrial environments

• International Certifications:​ Multiple agency approvals for global use

Input Characteristics

Typical Applications

• Process Control:​ 4-20mA loop measurement for temperature, pressure, level

• Flow Measurement:​ Flow transmitter signal acquisition

• Level Monitoring:​ Tank level transmitter inputs

• Pressure Monitoring:​ Pressure transducer and transmitter signals

• Analytical Instrumentation:​ pH, conductivity, and analyzer signals

• Valve Position:​ Valve position feedback signals

• Motor Monitoring:​ Motor current and load monitoring

• Energy Management:​ Power and current measurement

• Water Treatment:​ Chemical dosing and process measurement

• Environmental Monitoring:​ Air quality and emission monitoring

Important Technical Notes

1. System Requirements:​ Requires 1794 FLEX I/O adapter module (1794-AENT, 1794-ASB, etc.) and terminal base (1794-TB3G or TB3S). Not a standalone device.

2. Power Requirements:​ Powered from terminal base. Ensure adequate power supply capacity for adapter and all connected I/O modules.

3. Input Configuration:​ Each channel independently configurable via software for input range and filtering. Configuration stored in adapter memory.

4. Wiring:​ Use proper shielded, twisted pair cable for analog signals. For 2-wire transmitters, ensure proper loop power configuration.

5. Isolation:​ Each channel is isolated from others and from backplane. Maximum continuous isolation voltage is 250V AC.

6. Open Wire Detection:​ Configure open wire detection based on application requirements. Typically set for upscale (21mA) indication for 4-20mA inputs.

7. Filter Selection:​ Select appropriate filter frequency (10, 50, 60, 250, 500 Hz) based on signal characteristics and noise environment.

8. Environmental Conditions:​ Install in appropriate enclosure for protection. IP20 provides limited protection against dust and moisture.

9. Module Configuration:​ Requires configuration in programming software (Studio 5000, RSLogix 5000) for proper operation. Configure input range, filtering, and scaling per channel.

Note: For complete installation guidelines, wiring diagrams, configuration instructions, and detailed technical data, consult the official Allen-Bradley 1794 Series Technical Manual. Always verify the exact model number configuration with the manufacturer, as notation variations may occur.