Product Introduce
1794-IE8H is a Flex I/O series HART analog input module with 8 single-ended analog input channels, which can collect multiple signals at the same time. It has 16-bit resolution, provides high-precision data conversion (accuracy is about 0.015%), and adopts anti-interference circuit design.
There are different versions of the 1794-IE8H, the main differences being functionality and compatibility:
- 1794-IE8H/A: Standard version, suitable for general industrial applications
- 1794-IE8H/B: Enhanced version, especially suitable for multi-variable transmitters (such as situations where both pressure and temperature compensation are required in flow measurement systems)
Parameter
| Parameter | 1794‑IE8H | 1794‑IE8 | 1794‑IE8XT | 1794‑IF4I | 1794‑IE12 |
|---|---|---|---|---|---|
| Module Type | Flex I/O 8‑pt Analog Input (HART) | Flex I/O 8‑pt Analog Input | Flex I/O‑XT 8‑pt Analog Input | Flex I/O 4‑pt Isolated Analog Input | Flex I/O 12‑pt Analog Input |
| Input Channels | 8 single‑ended, non‑isolated | 8 single‑ended, non‑isolated | 8 single‑ended, non‑isolated | 4 differential, isolated | 12 single‑ended, non‑isolated |
| Resolution | 16‑bit | 16‑bit | 16‑bit | 16‑bit | 16‑bit |
| Supported Signals | 0/4–20 mA, 0–10 V; HART over 4–20 mA | 0/4–20 mA, ±10 V, 0–10 V | 0/4–20 mA, ±10 V, 0–10 V | 0/4–20 mA, ±10 V, ±5 V, ±2.5 V | 0/4–20 mA, ±10 V, 0–10 V (configurable) |
| HART Protocol | Built‑in (bidirectional digital comms over 4–20 mA) | Not supported | Not supported | Not supported | Not supported |
| Accuracy (25°C) | ±0.015% of full scale | ±0.2% of full scale | ±0.2% of full scale | ±0.1% of full scale | ±0.1% of full scale |
| Operating Temp | 0–55°C (standard); −20–70°C (XT) | −20–55°C | −40–70°C | −20–55°C | −20–55°C |
| Power Consumption | 24 V DC, ~295 mA | 24 V DC, 60 mA | 24 V DC, 60 mA | 24 V DC, 60 mA | 24 V DC, 30 mA |
| Backplane Current (FlexBus) | 5 V DC, 15 mA | 5 V DC, 60 mA | 5 V DC, 60 mA | 5 V DC, 60 mA | 5 V DC, 45 mA |
| Isolation | Non‑isolated (channel‑to‑bus) | Non‑isolated (channel‑to‑bus) | Non‑isolated (channel‑to‑bus) | Isolated (channel‑to‑channel, channel‑to‑bus) | Non‑isolated (channel‑to‑bus) |
| Key Features | HART comms, remote device config/diag | Basic analog input, cost‑effective | Extended temp range, harsh env | Channel isolation, high noise immunity | High channel density |
FAQ:
1.What industrial signal types does the 1794-IE8H support? Does it only work with HART devices?
- Supported signal types: 8 single-ended non-isolated channels, 16-bit resolution, compatible with 4-20mA/0-20mA current signals, ±10V/0-10V voltage signals.
- HART compatibility: Not only suitable for HART smart devices (can transmit analog signals and HART digital data at the same time, supporting remote configuration/diagnosis), it can also be used as an ordinary analog input module to connect to non-HART industrial equipment (such as ordinary transmitters, instruments).
2.What kind of communication adapter does the 1794-IE8H need to be used to connect to the EtherNet/IP network?
Recommended adapters:
1794-AENT series
1794-AENT: Single RJ45 port, standard environment
1794-AENTR: Dual port (with DLR redundancy), critical applications
1794-AENTRXT: dual ports + wide temperature (-40~70℃), harsh environment
Core requirements: Connection via FlexBus, adapter firmware ≥4.2; up to 8 Flex I/O modules per adapter
Note: The HART function is not affected by the adapter model and is supported normally.
3.What are the core differences between the 1794-IE8H and ordinary analog input modules such as the 1794-IE8?
| Parameter | 1794-IE8H | 1794-IE8 |
|---|---|---|
| HART Function | Built-in HART protocol; simultaneous transmission of 4-20mA analog signals and digital HART data; supports remote configuration, diagnostics, and parameter reading; compatible with HART smart transmitters | No HART protocol support; only standard analog input; cannot communicate with HART devices |
| Measurement Accuracy | 16-bit resolution; 0.1% FS accuracy (20°C); 0.05% FS temperature drift (0-55°C); more stable measurement | 12-bit unipolar / 11-bit + sign bit bipolar; ≤0.29% FS accuracy; larger temperature drift |
| Diagnostic Capability | Supports online diagnostics of HART devices (e.g., fault alarms, range overrun); facilitates predictive maintenance | Only basic channel status diagnostics; no in-depth diagnostic functions for smart devices |
| Application Scenarios | Process industry; systems requiring HART smart instruments and remote monitoring/maintenance | General industrial scenarios; only standard analog signal acquisition; cost-sensitive applications |
| Terminal Base | Recommended: 1794-TB3G/TB3GS (compatible with HART wiring) | Compatible with 1794-TB3/TB3S standard bases |
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