Allen-Bradley 1794-IEB2 FLEX I/O 2-Point Isolated Analog Input Module

The Allen-Bradley 1794-IEB2 is a 2-point isolated analog input module belonging to the Rockwell Automation Bulletin 1794 FLEX I/O family — one of the most widely deployed modular I/O platforms in industrial automation. Mounted on a standard 35 mm DIN rail through a FLEX I/O terminal base, the Allen-Bradley 1794-IEB2 accepts both voltage and current process signals, converting them into precise digital values that are transmitted to the host controller over the FLEXBUS backplane. Its two channels are individually isolated from each other and from the backplane, giving engineers the freedom to connect sensors of different references or ground potentials without introducing measurement errors or ground-loop noise.

Within the FLEX I/O architecture, the Allen-Bradley 1794-IEB2 sits alongside a wide range of digital, analog, thermocouple, and RTD modules, all of which snap onto a common terminal base to form a distributed I/O node that is interfaced to the plant network through an adapter such as the 1794-ACN, 1794-ADN, or 1794-AENTR. This modular philosophy allows the Allen-Bradley 1794-IEB2 to be combined with 4-channel, 8-channel, and 12-channel analog siblings to scale a node’s acquisition density precisely to the application. Because the module supports Removal and Insertion Under Power (RIUP), a failing unit can be replaced without shutting down the wider control system — a major advantage in continuous processes.

Positioned as the compact two-channel solution of the FLEX analog family, the Allen-Bradley 1794-IEB2 delivers cost-effective, isolated analog acquisition for machine builders, skid integrators, and process engineers who need reliable signal conversion within a small footprint. It remains an essential spare and expansion item across the enormous installed base of FLEX I/O nodes operating worldwide in discrete manufacturing, process control, and hybrid automation environments.

Category: A-B

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	1794-IEB2
Manufacturer	Allen-Bradley (Rockwell Automation)
Product Type	2-Point Isolated Analog Input Module
Product Series	Bulletin 1794 FLEX I/O
Number of Inputs	2 isolated, individually configurable channels
Input Signal Types	Voltage and current
Voltage Ranges	0–10 V DC, ±10 V DC, 0–5 V DC, ±5 V DC, 1–5 V DC
Current Ranges	0–20 mA, 4–20 mA
Resolution	12-bit digital conversion
Isolation Voltage	50 V continuous (channel-to-channel and channel-to-backplane)
Backplane Current Draw	≈ 50 mA at 5 V DC from FLEXBUS
Operating Temperature	0 °C to 55 °C (32 °F to 131 °F)
Mounting	1794 terminal base (screw or spring clamp) on 35 mm DIN rail
Compatible Adapters	1794-ACN, -ACNR, -ADN, -ADNR, -AENTR, -APB, -TB3G

Main Features and Advantages

True channel-to-channel isolation: The defining characteristic of the Allen-Bradley 1794-IEB2 is that each of its two input channels is electrically isolated from the other and from the FLEXBUS backplane. This means the module can accept signals from sensors operating at different ground references — for example, a 4-20 mA differential pressure transmitter and a 0-10 V level transducer feeding from separate power supplies — without risk of circulating ground currents corrupting the measurement. In plants with mixed-vendor instrumentation or long field cabling runs, this isolation often eliminates the need for external signal conditioners, saving cabinet space and reducing commissioning time.

Dual voltage and current capability in one slot: The Allen-Bradley 1794-IEB2 accepts a broad envelope of standard industrial signal ranges — from ±10 V DC for high-level references down to 4-20 mA for noisy two-wire transmitters. Because each channel is individually configurable, one module can mix voltage and current inputs simultaneously, which is especially valuable in machine retrofits where legacy instrumentation must be integrated alongside newer transmitters without redesigning the I/O architecture.

Compact two-channel footprint: Where the FLEX analog family offers 4-, 8-, and 12-channel siblings, the Allen-Bradley 1794-IEB2 occupies the leanest position in the lineup. For skids, OEM machines, and small distributed nodes where only a couple of analog measurements are required, this compact two-channel format delivers precisely the right density without over-provisioning — a cost and space advantage that scales meaningfully across multi-node installations.

Native FLEX I/O ecosystem integration: The Allen-Bradley 1794-IEB2 snaps onto any standard 1794 terminal base — screw, spring-clamp, or G-series DIN-alignment variants — and communicates over the FLEXBUS to the adapter of choice, whether that is an EtherNet/IP 1794-AENTR, a ControlNet 1794-ACN, a DeviceNet 1794-ADN, or an interposing adapter for ControlLogix, PLC-5, or SLC 500 backplanes. Configuration is performed through the host controller’s programming software (RSLogix 500 / RSLogix 5000 / Studio 5000), so no separate configuration tool is required. The module also supports Removal and Insertion Under Power (RIUP), meaning a replacement can be fitted during production without interrupting the rest of the node — a significant advantage in continuous operations where every minute of unplanned downtime carries a real cost.

Rugged industrial construction: Enclosed in the standard FLEX I/O housing and rated for operation across 0 °C to 55 °C, the Allen-Bradley 1794-IEB2 withstands the vibration, thermal cycling, and electromagnetic environment typical of machine-level enclosures and small process cabinets, delivering years of stable analog acquisition with minimal field maintenance.