Product Overview
The Allen-Bradley 1794-IE8H is a Flex I/O HART analog input module designed for reliable signal acquisition in industrial environments. This module supports eight single-ended, non-isolated input channels and is compatible with HART communication protocol, enabling access to both analog and digital data from field devices.
Technical Specifications Breakdown
Key parameters for the 1794-IE8H are listed below for quick reference:
| Feature | Specification |
|---|---|
| Product Type | Flex I/O HART Analog Module |
| Number of Inputs | 8 Single-ended |
| Resolution | 16 bits |
| Absolute Accuracy | 0.1% Full Scale @ 20 °C (68°F) |
| Accuracy Drift with Temperature | 0.05% Full Scale for 0 °C...55 °C (32...131 °F) |
| Step Response to 99% | 80 ms |
| External DC Supply Range | 19.0 to 31.2V DC (includes 5% AC ripple) |
| Power Dissipation | 3.9W @ 31.2V DC max. |
| Isolation Voltage | 50V Continuous |
Industry Applications
The 1794-IE8H allows engineers to monitor 4-20 mA loops while simultaneously accessing HART diagnostics for predictive maintenance. Its 16-bit resolution and 0.1% accuracy ensure precise measurement, reducing waste and improving product quality. By integrating this module, facilities can lower operational costs through enhanced fault detection and reduced downtime.
Installation & Setup Guidance
Mount the 1794-IE8H on a DIN rail and install it onto a compatible terminal base (1794-TB3G or 1794-TB3GS). Wire size is determined by the installed terminal base. Connect an external DC supply within 19.0 to 31.2V DC, ensuring proper polarity. The module features eight red fault indicators, eight yellow channel indicators, and one green power indicator for quick status checks. No enclosure is required as the module has an open-style rating. Configure input filter cutoff, data format, and fault mode via the control system software.
Maintenance & Reliability
Regularly inspect the module for environmental stress, as it operates within -20 to 55 °C. Verify that the external DC supply remains within the specified range to prevent power dissipation exceeding 3.9W. The module's non-isolated design requires careful grounding to avoid ground loops. Monitor fault indicators to detect lead breakage or overrange conditions early. With no moving parts, the 1794-IE8H offers long-term reliability in harsh industrial settings.
Compatibility & Integration
The 1794-IE8H is compatible with Flex I/O communication adapters, including ControlNet, Ethernet, and ProfiBus (catalog number 1794-APBDV1 only). For Series B HART modules, ControlNet revision 5.1 or greater and Ethernet revision 4.2 or greater are required. The module supports multiple data formats and individually configurable ranges, enabling integration with various PLC and DCS systems.
Selection Guide & Purchasing Advice
When selecting the 1794-IE8H, verify that your system supports HART protocol and that the terminal base (1794-TB3G or 1794-TB3GS) is available. For pricing and availability, contact AutoDCSTech, your trusted industrial automation parts supplier. Please verify current lifecycle status and availability with AutoDCSTech before ordering.
Availability & Condition at AutoDCSTech
| Part Number | 1794-IE8H |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
