Allen-Bradley 1794-OE8 Flex I/O High-Density Analog Module

Overview

The 1794-OE8 by Allen-Bradley is a high-density Flex I/O analog input module designed for precise industrial control applications. It supports eight single-ended channels capable of processing multiple analog input types with high accuracy.

This module integrates seamlessly with Flex I/O communication adapters and terminal bases, enabling distributed I/O architectures. Its DIN-rail mounting, robust construction, and 24V DC external supply ensure reliable performance in harsh industrial environments.

Key Features

• Brand & Model: Allen-Bradley 1794-OE8

• Module Type: Flex I/O High-Density Analog Module

• Product Line: Flex I/O 1794

• Number of Inputs: 8 Single-Ended

• Input Types: 0–20mA, 4–20mA, ±10VDC, 0–10VDC

• Conversion Type: Successive Approximation

• Data Format: 16-bit 2’s complement, left justified

• Resolution: Voltage 11-bit plus sign bipolar, Current 12-bit unipolar

• Absolute Accuracy: 0.20% full scale @ 25°C

• Accuracy Drift with Temperature: Voltage 0.00428% FS/°C, Current 0.00407% FS/°C

• Terminal Bases Supported: 1794-TB2, TB3, TB3S, TB3T, TB3TS

• Indicators: 1 green/red power/status LED

• External DC Supply: 24V DC nominal (10–31.2V DC including ripple)

• Mounting: DIN Rail

• Operating Temperature: 0 to 55°C

• Storage Temperature: –40 to 85°C

• Vibration: 5g @ 10–500 Hz

• Isolation Voltage: 50V continuous

• Power Dissipation: 3.0W at 31.2V DC

• Thermal Dissipation: 10.2 BTU/hour at 31.2V DC

• Weight: 0.25 lbs (0.11 kg)

Detailed Description

The 1794-OE8 module handles eight analog input channels with high precision, capable of interfacing with transmitters, recorders, and process controllers. Its conversion type uses successive approximation, producing 16-bit data formatted in 2’s complement.

Voltage and current inputs maintain absolute accuracy of 0.20% full scale at 25°C, with minimal drift due to temperature. Flexible terminal base compatibility ensures easy integration into existing Flex I/O systems, while DIN-rail mounting simplifies installation.

The module draws 60mA from FlexBus and external DC supply, dissipating only 3W, which reduces energy loss and thermal impact. Its robust LED indicators provide immediate status feedback during operation.

Specifications Table

Why Choose 1794-OE8

• Supports multiple analog input types for versatile industrial applications.

• Provides high-density, precise measurement in distributed I/O architectures.

• Offers reliable operation with minimal thermal and electrical interference.

• Simplifies installation via DIN-rail mounting and terminal base compatibility.

• Equipped with LED indicators for clear operational status feedback.

FAQ

Q1: Is the Allen-Bradley 1794-OE8 fully original?
A1: Yes, the 1794-OE8 is brand new and 100% original from Allen-Bradley.

Q2: How quickly can the module ship?
A2: Inventory is in stock. Shipping usually takes 3 days to 2 weeks depending on order size, commonly via DHL.

Q3: What if I receive a defective module?
A3: Returns are supported within 30 days of receipt.

Q4: How many inputs does the 1794-OE8 support?
A4: The 1794-OE8 supports eight single-ended analog inputs.

Q5: What input voltage and current ranges does it support?
A5: It accepts 0–20mA, 4–20mA, ±10VDC, and 0–10VDC signals for flexible instrumentation integration.