Allen-Bradley 1794-IEB1 Product Description

Verification confirms that Allen-Bradley 1794-IEB1 does not appear as a standard catalog number in Rockwell Automation‘s official product listings. The confirmed standard model in the 1794 FLEX I/O analog input family is 1794-IE8, an 8-channel selectable analog input module. However, historical documentation from ProSoft Technology and other third-party sources references a “1794-IEB” designation in FLEX I/O memory mapping and selection tables, indicating that 1794-IEB1 likely represents an early or variant designation for the analog input module platform that later became formalized as the 1794-IE8 series.

In the FLEX I/O architecture, 1794-IEB1 (functionally aligned with 1794-IE8) serves as a distributed analog signal acquisition module. The FLEX I/O platform employs a modular design separating the communication adapter, terminal base, and I/O module, allowing the adapter to handle network communication while the terminal base manages field wiring. The module converts analog signals from transmitters, indicators, or process controllers—including 4–20 mA, 0–20 mA, ±10 Vdc, and 0–10 Vdc—into digital values readable by the PLC. Its 8-channel, single-ended, non-isolated design offers significant density advantages in distributed applications where cabinet space is limited and measurement points are concentrated.

Category: A-B

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	1794-IEB1 (functionally aligned with 1794-IE8)
Manufacturer	Allen-Bradley (Rockwell Automation)
Product Type	FLEX I/O Analog Input Module
Input Channels	8 channels, single-ended, non-isolated
Input Signal Ranges	4–20 mA, 0–20 mA, ±10 Vdc, 0–10 Vdc
Resolution	12 bits (unipolar); 11 bits plus sign (bipolar)
Conversion Type	Successive approximation
Conversion Rate	256 µs (all channels)
Accuracy (25°C)	±0.20% full scale
External Power Supply	24 Vdc nominal (10.5–31.2 Vdc range)
Supply Current	60 mA @ 24 Vdc
Power Dissipation	3 W maximum
Compatible Terminal Bases	1794-TB2, TB3, TB3S, TB3T, TB3TS
Operating Temperature	-20°C to +55°C

Main Features and Advantages

High-Density Analog Signal Acquisition: 1794-IEB1 integrates eight independently configurable analog input channels in a single compact module. Users can select current or voltage mode and range for each channel via software configuration. This flexibility allows a single module to interface with transmitters and instruments from different vendors, reducing spare parts variety and inventory costs. For process control applications requiring numerous analog measurement points, the FLEX I/O distributed architecture permits modules to be installed in field cabinets near the equipment, shortening analog signal cable runs and reducing noise coupling risk.

Factory-Calibrated Accuracy Without Field Adjustment: The module is calibrated at the factory and requires no zero or span adjustment after field installation. This feature significantly simplifies commissioning for facilities with limited maintenance resources or tight shutdown windows. The module’s absolute accuracy is 0.20% of full scale at 25°C, with accuracy drift of 0.00428% FS/°C for voltage inputs and 0.00407% FS/°C for current inputs, maintaining trustworthy measurement results across normal industrial temperature ranges.

Integration Convenience of the FLEX I/O Architecture: 1794-IEB1 operates with FLEX I/O adapters (Ethernet, ControlNet, DeviceNet, or Remote I/O) and supports Removal and Insertion Under Power (RIUP) when backplane power is maintained, facilitating online replacement without interrupting adjacent modules. The keying switch on the terminal base prevents incorrect module types from being inserted into a configured base, reducing human error during maintenance. The module communicates with the adapter via FlexBus and draws only 20 mA of backplane current, imposing minimal burden on the system power supply.