Allen-Bradley 1794-IF8IH – 8-Channel High-Resolution Analog Input Module | FLEX I/O Platform
Engineering Background
The Allen-Bradley 1794-IF8IH is a high-resolution analog input module designed for the FLEX I/O platform by Rockwell Automation. It is engineered to interface directly with RTD (Resistance Temperature Detector) and thermocouple sensors, delivering precise temperature and process measurements in demanding industrial environments. The FLEX I/O architecture enables modular, distributed I/O deployment across a wide range of control topologies.
Product Positioning
Targeted at process control engineers and system integrators requiring high-accuracy analog signal acquisition, the 1794-IF8IH occupies a critical role in temperature-intensive applications such as furnace control, HVAC systems, chemical processing, and food & beverage manufacturing. Its 8-channel density and 16-bit resolution make it a cost-effective solution for multi-point temperature monitoring within a single I/O slot.
Complete Technical Specifications
| Part Number / SKU | 1794-IF8IH |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Series / Platform | FLEX I/O |
| Module Type | Analog Input Module |
| Number of Channels | 8 Differential Analog Input Channels |
| Input Signal Types | RTD, Thermocouple (Type J, K, E, T, R, S, B, N), mV |
| Resolution | 16-bit |
| Backplane Current (5V DC) | 75 mA |
| Backplane Current (24V DC) | 2 mA |
| Operating Temperature | 0 °C to 60 °C (32 °F to 140 °F) |
| Storage Temperature | -40 °C to 85 °C (-40 °F to 185 °F) |
| Relative Humidity | 5% to 95% (non-condensing) |
| Dimensions (H × W × D) | 94 mm × 23 mm × 87 mm |
| Weight | Approx. 300 g |
| Certifications | UL, CE, C-Tick |
| Communication Interface | FLEX I/O Backplane (via adapter module) |
| Compatible Adapters | 1794-AENT, 1794-ADN, 1794-ACN15, 1794-ACNR15 |
| Country of Origin | United States |
| HS Code | 8537.10 |
Proven Application Environments
- Furnace & Kiln Temperature Control — Multi-point thermocouple monitoring with high-resolution feedback for precise thermal profiling.
- Chemical & Petrochemical Processing — RTD-based temperature acquisition for reactor vessels, heat exchangers, and distillation columns.
- Food & Beverage Manufacturing — Hygienic process temperature monitoring compliant with industry safety standards.
- HVAC & Building Automation — Distributed temperature sensing across large facilities using FLEX I/O remote I/O drops.
- Pharmaceutical Production — Validated temperature data acquisition for GMP-compliant batch processes.
- Water & Wastewater Treatment — Robust analog input for temperature and process variable monitoring in harsh environments.
Engineering Advantages
- 16-Bit Resolution — Delivers ±0.1 °C measurement accuracy, critical for tight process control loops.
- 8-Channel Density — Maximizes I/O slot utilization, reducing panel footprint and wiring costs.
- Universal Sensor Compatibility — Supports all major thermocouple types and 2/3/4-wire RTD configurations without external signal conditioners.
- Open-Circuit Detection — Per-channel fault detection with configurable fail-safe states to protect downstream processes.
- FLEX I/O Modularity — Hot-swap capable within the FLEX I/O system, enabling maintenance without system shutdown.
- Seamless Studio 5000 Integration — Full Add-On Profile (AOP) support for rapid configuration and online diagnostics in Logix Designer.
System Architecture & Signal Flow
The 1794-IF8IH connects to the FLEX I/O backplane via the module’s integrated backplane connector. Field sensor wiring terminates at the removable terminal block (RTB), which accepts 2, 3, or 4-wire RTD configurations and thermocouple pairs. The module performs on-board cold-junction compensation (CJC) for thermocouple inputs. Digitized data is transmitted across the backplane to the adapter module (e.g., 1794-AENT for EtherNet/IP), which communicates with the ControlLogix or CompactLogix controller. Configuration and diagnostics are managed via Studio 5000 Logix Designer using the module’s AOP.
Signal Flow: Field Sensor → RTB Terminal Block → 1794-IF8IH ADC (16-bit) → FLEX I/O Backplane → Adapter Module → EtherNet/IP / DeviceNet / ControlNet → PLC Controller
Sourcing & Quality Verification
- All units sourced through verified industrial automation supply channels with full traceability.
- Each module undergoes functional verification prior to shipment, including backplane communication and channel integrity checks.
- Original manufacturer labeling, firmware version, and serial number intact on all units.
- Packaging inspected for physical damage; ESD-safe handling throughout storage and fulfillment.
- Certificate of conformance available upon request for regulated industries.
Procurement Process
- Confirm Compatibility — Verify your FLEX I/O adapter model and backplane slot availability. Contact our engineering team if assistance is needed.
- Request a Quote — Submit your quantity and delivery requirements via support@konmask.com or the product page inquiry form.
- Order Confirmation — Purchase order accepted; lead time and shipping options confirmed within 1 business day.
- Shipment & Tracking — Units dispatched with full tracking. Export documentation (commercial invoice, packing list, COO) provided for international orders.
- After-Sales Support — Technical support available for installation, configuration, and commissioning queries.
Technical FAQ
Q: Is the 1794-IF8IH compatible with ControlLogix and CompactLogix controllers?
A: Yes. Via a compatible FLEX I/O adapter (e.g., 1794-AENT for EtherNet/IP), the module integrates with both ControlLogix and CompactLogix platforms using Studio 5000 Logix Designer.
Q: Can I mix thermocouple types across the 8 channels?
A: Yes. Each channel is independently configurable for thermocouple type (J, K, E, T, R, S, B, N) or RTD input type via software configuration in Logix Designer.
Q: Does the module support 4-wire RTD connections?
A: Yes. The 1794-IF8IH supports 2-wire, 3-wire, and 4-wire RTD configurations. 4-wire connections provide the highest accuracy by eliminating lead resistance errors.
Q: What happens if a sensor wire breaks?
A: The module provides open-circuit detection on each channel. Upon detection, the channel reports a fault and the output can be configured to hold last value or go to a defined fail-safe state.
Q: Is the module available as new, surplus, or refurbished?
A: We supply both new and certified surplus units. All surplus units are functionally tested and verified. Please specify your preference when requesting a quote.
© 2026 Konmask.com. All rights reserved.
Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
