Allen-Bradley 1794-IEB 8-Channel Analog Input — High-Resolution FLEX I/O Module

The Allen-Bradley 1794-IEB is an 8-channel analog input module belonging to the Allen-Bradley FLEX I/O product family, which is designed to provide distributed I/O capability for programmable logic controller (PLC) and programmable automation controller (PAC) systems. The module accepts eight individually selectable analog input channels, each configurable for either voltage or current signals. This flexibility allows a single Allen-Bradley 1794-IEB to interface with multiple instrument types—such as temperature transmitters, pressure transducers, level instruments, and flow meters—without requiring a separate module for each signal range.As a FLEX I/O analog input module, the Allen-Bradley 1794-IEB is intended for use with a compatible FLEX I/O terminal base and communication adapter. It provides local signal conditioning and conversion, transmitting processed data to the control system over the appropriate I/O network. Its compact form factor and modular architecture make it suitable for installations where cabinet space is limited or where I/O points must be distributed close to field devices. The module also incorporates diagnostic features, including open-wire and overrange detection, which improve fault visibility and reduce the time required to identify signal-integrity problems.The Allen-Bradley 1794-IEB is powered by 24VDC and supports common industrial analog ranges. With a 15-bit plus sign resolution, it delivers the measurement precision required for many continuous process-control applications. The module is designed to operate in industrial environments with temperatures from 0 to 55 °C, and it offers easy installation and maintenance through its modular terminal-base design. Across food and beverage, water and wastewater, material handling, and discrete manufacturing applications, the Allen-Bradley 1794-IEB provides a dependable and scalable solution for acquiring analog process data.

Category: A-B

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	1794-IEB
Brand	Allen-Bradley (Rockwell Automation)
Product Type	Analog Input Module
Series	1794 FLEX I/O
Number of Inputs	8 individually selectable channels
Input Signal Types	Voltage and current
Voltage Ranges	0–10 VDC; ±10 VDC
Current Ranges	0–20 mA; 4–20 mA
Resolution	15 bits plus sign
Module Resolution	12 bits
Conversion Type	Single-ended
Input Impedance	>1 MΩ (voltage); 250 Ω (current)
Backplane Current Draw	110 mA at 5VDC
Power Supply	24VDC
Update Time	2 ms
Accuracy	±0.5% full scale at 25 °C
Open-Wire Detection	Supported on 4–20 mA range
Overrange/Underrange Detection	Supported
Slot Width	1 FLEX I/O slot
Operating Temperature	0 to 55 °C
Storage Temperature	-40 to 85 °C
Relative Humidity	5% to 95%, non-condensing
Enclosure Rating	IP20 (open-style module)
Mounting	DIN rail with compatible terminal base
Dimensions	46 × 74 × 35 mm
Weight	60 g
Certification	CE, cULus, CSA, ATEX (depending on configuration)

Main Features and Advantages

Flexible Channel Configuration:A major advantage of the Allen-Bradley 1794-IEB is its support for eight individually configurable analog input channels. Each channel can be independently set for voltage or current operation, allowing the module to accommodate a mix of instrument types. This reduces the number of modules required in an I/O assembly and simplifies spare-parts management for facilities with diverse analog signal requirements.High-Resolution Signal Conversion:The Allen-Bradley 1794-IEB offers 15-bit plus sign resolution with 12-bit module resolution, providing accurate representation of analog process values. This measurement quality supports precise control of variables such as temperature, pressure, level, and flow, helping maintain product quality and process stability in demanding industrial applications.Built-In Diagnostics:The module includes open-wire detection for 4–20 mA signals and overrange or underrange detection across supported ranges. These features improve visibility into field-device and wiring problems, enabling maintenance teams to distinguish between process abnormalities and instrumentation faults. Diagnostic data can be accessed through the control system to support faster troubleshooting.Compact Modular Design:The Allen-Bradley 1794-IEB occupies a single FLEX I/O slot and mounts on a compatible terminal base. Its compact footprint conserves panel space, while the modular architecture allows I/O to be added or replaced without disturbing the entire assembly. This is particularly valuable in distributed installations and space-constrained control cabinets.Distributed I/O Capability:FLEX I/O is designed to position I/O modules closer to field devices, reducing wiring runs and installation cost. When paired with an appropriate FLEX communication adapter, the Allen-Bradley 1794-IEB allows analog signals to be acquired locally and communicated efficiently to the controller over a network such as DeviceNet, ControlNet, EtherNet/IP, or PROFIBUS DP.Industrial Reliability:The module operates across a 0–55 °C temperature range and is designed for installation in standard industrial control cabinets. Its 24VDC power requirement and 2 ms update time make it compatible with many common automation architectures, while its diagnostic functions support long-term system availability.