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

Product Overview

The 1794-IE8 is a Flex I/O analog input module from Allen-Bradley. It has eight single-ended input channels. These channels accept voltage or current signals. You can use ranges like 0-20mA, 4-20mA, +/-10VDC, and 0-10VDC. This module works with Flex I/O communication adapters. It mounts on terminal bases such as 1794-TB2, -TB3, and -TB3S. The module is part of a distributed I/O architecture. It receives signals from field transmitters and process loop controllers. The 1794-IE8 uses successive approximation conversion. It provides 16-bit data in two's complement format. Resolution is 12 bits unipolar and 11 bits plus sign bipolar. The module does not need calibration.

Application Scenarios

This module fits many industrial automation tasks. Use it to monitor analog sensors in a plant. Connect it to pressure transmitters or temperature probes. It can interface with flow meters and level sensors. The 1794-IE8 is common in process control systems. It also works in machine monitoring applications. You can use it in remote I/O racks. It supports both current and voltage signals. This flexibility makes it suitable for various industries.

Technical Specifications

Input Characteristics

The module has eight single-ended inputs. Input types include 0-20mA, 4-20mA, +/-10VDC, and 0-10VDC. Conversion rate is 256 µs on all channels. Accuracy is 0.20% full scale at 25°C. Drift is 0.00428%/°C for voltage and 0.00407%/°C for current. Voltage resolution is 2.56 mV/cnt unipolar and 5.13 mV/cnt bipolar. Current resolution is 5.13 µA/cnt.

Power and Environmental

External DC supply range is 10.0 to 31.2V DC. Nominal is 24V DC. Module draws 60 mA from FlexBus and 60 mA from external supply. Power dissipation is 3.0W at 31.2V. Thermal dissipation is 10.2 BTU/h at 31.2V. Operating temperature is 0 to 55°C. Storage temperature is -40 to 85°C. Vibration is 5g at 10 to 500 Hz.

Installation & Maintenance Guide

Install the 1794-IE8 on a DIN rail or panel. You need a compatible terminal base. Choose from 1794-TB2, -TB3, -TB3S, -TB3T, or -TB3TS. Use one terminal base per module. Connect input signals to the base. Ensure wiring meets the terminal base specifications. No calibration is required. The module has a green/red status indicator. Check the indicator for proper operation. Keep the module within operating temperature range.

Packing List

The package includes one 1794-IE8 module. It also contains a quick start guide. Terminal base and wiring are not included. Order these separately as needed.