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Description
Application Scenarios
A regional water utility was struggling with inconsistent pH, chlorine and flow readings at a remote booster station. The original I/O used fixed-range cards with separate signal isolators, and calibration required rewiring whenever a transmitter range changed. After replacing the cards with the 1794-IEB3, each channel was configured in software for the correct 4–20 mA loop, and open-wire detection immediately identified two faulty transmitter connections that had previously shown only as drifting readings. The same station later added a ±10 Vdc turbine flowmeter without changing hardware. Operators regained confidence in the data, and the maintenance team could locate a failed loop from the diagnostic status rather than by tracing wires in the field.The module is equally well suited to machine-tool auxiliary loops, material-handling conveyors, food and beverage batch skids, and process auxiliary systems where pressure, temperature, level and flow values must be captured reliably without dedicating a full-size I/O rack to analog signals.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 1794-IEB3 |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Category | FLEX I/O Analog Input Module |
| Number of Inputs | 8 single-ended analog inputs |
| Input Types | Voltage or current, software-selectable per channel |
| Input Ranges | ±10 Vdc; 0–10 Vdc; 0–5 Vdc; 1–5 Vdc; 0–20 mA; 4–20 mA |
| Resolution | 15 bits plus sign (16 bits), selectable to 16 bits plus sign |
| Conversion Type | Delta-sigma analog-to-digital converter |
| Accuracy | ±0.1% full scale |
| Update Time | 2 ms for 8 channels |
| Open Circuit Detection | Yes (current input modes) |
| Over-Range/Under-Range Detection | Yes |
| Backplane Current Draw | 5 Vdc: 130 mA; 24 Vdc: 50 mA (nominal values) |
| Enclosure Type | Open, IP20-rated industrial enclosure |
| Operating Temperature | 0 to 55 °C (32 to 131 °F) |
| Dimensions / Weight | Approx. 4.6 × 9.3 × 6.9 cm; 0.10 kg |
| Compatible Terminal Bases | 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS, 1794-TBN, 1794-TBNF |
| Compatible Backplanes | 1794-BP4 (4-point), 1794-BP8 (8-point) |
Technical Principles and Innovative Values
- Innovation Point 1 — Eight independently selectable channels. Each channel on the 1794-IEB3 can be set to a different input type and range. A single module can therefore accept a 4–20 mA pressure transmitter, a 1–5 Vdc level signal and a ±10 Vdc flowmeter output without requiring multiple dedicated cards.
- Innovation Point 2 — 16-bit delta-sigma conversion. The delta-sigma converter oversamples and filters the analog signal, delivering stable, high-resolution data. Selectable 15-bit-plus-sign or 16-bit-plus-sign formats let users balance measurement precision against application requirements.
- Innovation Point 3 — Built-in signal diagnostics. Open-wire detection in current mode, together with over-range and under-range detection, allows the controller to distinguish a true process value from a broken loop or out-of-range signal. This reduces troubleshooting time and prevents a failed transmitter from being mistaken for a process upset.
- Innovation Point 4 — Fast complete update. All eight channels update in approximately 2 ms, providing consistent scan-to-scan data for control loops and reducing the risk of stale analog values influencing the process calculation.
- Innovation Point 5 — Compact distributed I/O architecture. The 1794-IEB3 mounts on a 1794-TB terminal base and a 1794-BP backplane. This lets panels place analog I/O close to field instruments while keeping wiring, panel space and installation costs under control.
- Innovation Point 6 — Broad controller interoperability. The module communicates through the FLEX I/O adapter architecture and is supported across multiple Rockwell platforms, including ControlLogix, SLC 500, PLC-5 and MicroLogix systems when used with the appropriate adapter and configuration software.
