Allen-Bradley 1794-IE8 Flex I/O Analog Input Module Overview

Product Introduction

When you need reliable analog signal acquisition in a distributed I/O architecture, the Allen-Bradley 1794-IE8 delivers. Part of the Flex I/O family from Rockwell Automation, this high-density analog input module accepts eight single-ended channels for voltage or current signals. It interfaces seamlessly with field transmitters, recorders, and process controllers, making it a versatile choice for industrial automation.

Technical Specifications Breakdown

The 1794-IE8 module features eight single-ended inputs accepting 0 to 20 mA, 4 to 20 mA, ±10 VDC, and 0 to 10 VDC signal types. It uses successive approximation conversion with a 16-bit 2’s complement, left-justified data format. Resolution reaches 12 bits in unipolar mode and 11 bits plus sign for bipolar inputs. Absolute accuracy is 0.20% of full scale at 25 °C, with an accuracy drift of 0.00428% full scale/°C for the voltage terminal and 0.00407% full scale/°C for the current terminal. The module requires an external DC supply of 24V DC nominal (range 10.0…31.2V DC including 5% AC ripple) and draws 60 mA from the FlexBus. Power dissipation is 3.0W at 31.2V DC, with thermal dissipation of 10.2 BTU/hour. Operating temperature spans 0 to 55 °C (32 to 131 °F), and storage temperature ranges from –40 to 85 °C (–40 to 185 °F). Vibration resistance is 5g at 10 to 500 Hz.

Industry Applications

In process control environments, the 1794-IE8 connects to pressure transmitters and temperature sensors that output 4-20 mA loops. Its 0.20% full-scale accuracy ensures precise monitoring for chemical batch processes. For manufacturing lines, the module reads ±10 VDC signals from analog sensors, enabling real-time feedback for motion control systems. The eight single-ended channels allow cost-effective expansion without sacrificing performance.

Installation & Setup Guidance

Mount the 1794-IE8 on a DIN rail using a compatible terminal base such as the 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, or 1794-TB3TS. Wire size depends on the chosen terminal base. Connect the external DC supply within the 10.0…31.2V DC range. The green/red power/status indicator confirms operational status. No field calibration is required—the module ships factory-calibrated.

Compatibility & Integration

The 1794-IE8 works with Flex I/O communication adapters for Ethernet, ControlNet, and Remote I/O networks. It integrates into Rockwell Automation’s distributed I/O architecture, pairing with controllers like CompactLogix or ControlLogix via the appropriate adapter. The module supports up to eight single-ended inputs per unit, simplifying wiring in multi-point installations.

Selection Guide & Purchasing Advice

Before ordering the 1794-IE8, verify your system’s communication adapter and terminal base requirements. The module requires one terminal base (1794-TB2, -TB3, -TB3S, -TB3T, or -TB3TS) and an external 24V DC supply. For complete technical specifications, please contact BluePLC Industrial. Our team can confirm lifecycle status and availability to ensure a smooth procurement process.