Description
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1794-IEB (also referenced as 1794-IE8) |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Type | Analog Input Module |
| Number of Inputs | 8 single-ended, non-isolated |
| Input Signal Ranges | 0–20 mA, 4–20 mA, 0–10 VDC, ±10 VDC |
| Resolution | 12 bits unipolar; 11 bits plus sign bipolar |
| Data Format | Left-justified, 16-bit 2’s complement |
| Conversion Type | Successive approximation |
| Conversion Rate | 256 µs (all channels) |
| Absolute Accuracy | 0.20% Full Scale @ 25 °C |
| Accuracy Drift (Voltage) | 0.00428% Full Scale / °C |
| Accuracy Drift (Current) | 0.00407% Full Scale / °C |
| Nominal Supply Voltage | 24 VDC |
| Supply Voltage Range | 19.2–31.2 VDC |
| Supply Current | 60 mA @ 24 VDC |
| Isolation Voltage | 850 VDC (tested, no isolation between channels) |
| Maximum Power Dissipation | 3 W @ 31.2 VDC |
| Maximum Thermal Dissipation | 10.2 BTU/hr @ 31.2 VDC |
| Operating Temperature | 0 to 55 °C |
| Storage Temperature | -40 to 85 °C |
| Mounting Method | DIN rail or panel mount |
| Compatible Terminal Bases | 1794-TB2, 1794-TB3 |
| Indicator | 1 green power LED |
| Enclosure Rating | Open style |
Main Features and Advantages
High-resolution, multi-range analog acquisition. The 1794-IEB provides eight independently configurable channels, each capable of accepting either current or voltage signals without hardware jumpers. With 12-bit unipolar and 11-bit-plus-sign bipolar resolution, the module captures fine process variations that coarser modules would miss, giving control engineers the measurement fidelity needed for tight-loop process control.
Fast, consistent conversion performance. A conversion rate of 256 microseconds across all channels means the Allen-Bradley 1794-IEB can refresh an entire eight-channel scan window in well under a millisecond. This deterministic behavior is essential in applications such as flow totalization, batching, and fast-pressure monitoring where stale data directly impacts product quality.
Exceptional accuracy with low drift. At 0.20% full scale at 25 °C and drift rates of only 0.00428% per °C (voltage) and 0.00407% per °C (current), the 1794-IEB maintains calibration-grade performance across its full operating temperature range. This stability translates into fewer re-calibration cycles and more trustworthy trend data over the life of the installation.
No field calibration required. The module ships from the factory pre-calibrated, eliminating the need for on-site calibration equipment or specialized technician time. This reduces commissioning labor and keeps the system operational with minimal interruption.
Distributed I/O flexibility. When paired with a FLEX I/O communication adapter—EtherNet/IP, ControlNet, DeviceNet, PROFIBUS, or Remote I/O—the 1794-IEB lets you place analog I/O exactly where the signals originate, dramatically reducing long analog cable runs and their susceptibility to electrical noise. The modular FLEX I/O architecture also supports RIUP (Removal and Insertion Under Power) on many configurations, enabling module replacement without a full system shutdown.
Compact footprint for retrofit projects. Its small form factor and open-style enclosure make the 1794-IEB an ideal choice for upgrading legacy panels where space is constrained, allowing engineers to add modern analog capability without redesigning the entire enclosure.
Application Field
The 1794-IEB is purpose-built for industrial environments where accurate analog signal measurement drives process decisions. In oil and gas and petrochemical facilities, it interfaces directly with pressure and differential-pressure transmitters on pipelines, separators, and compressor skids, providing the real-time data needed for safe and efficient operation. Water and wastewater treatment plants use the module to read level transmitters in clarifiers and chemical dosing pumps, as well as flow meters on effluent discharge lines.
In food and beverage processing, the Allen-Bradley 1794-IEB connects to temperature transmitters on pasteurizers and fill-level sensors on tanks, helping maintain both product quality and regulatory compliance. Pulp and paper mills rely on it for consistency and basis-weight measurements, while power generation facilities deploy it for burner management and auxiliary system monitoring.
Beyond process industries, the module finds extensive use in automotive assembly, machine tooling, and general discrete manufacturing, where it captures analog feedback from vision systems, force sensors, and servo drives. Anywhere a 4–20 mA loop or 0–10 V signal must be brought into an Allen-Bradley control platform reliably and accurately, the 1794-IEB delivers a proven, cost-effective solution that integrates natively with RSLogix/Studio 5000 programming environments.
