Allen-Bradley 1794-IE8H — 8-Channel Analog Input Module | FLEX I/O Platform
Engineering Background: The 1794-IE8H is part of Rockwell Automation’s FLEX I/O family — a modular, distributed I/O platform engineered for high-density signal acquisition in process and discrete manufacturing environments. Designed to mount on a standard FLEX I/O terminal base, this module integrates seamlessly into ControlLogix, CompactLogix, and legacy PLC-5/SLC 500 architectures via the 1794-AENT, 1794-ACN15, or 1794-ADNK adapter.
Product Positioning: The 1794-IE8H delivers 8 individually configurable analog input channels with high-resolution conversion, making it the preferred choice for procurement engineers sourcing reliable signal conditioning hardware for process control, HVAC, energy monitoring, and OEM machine integration. Konmask.com supplies verified, tested units from certified surplus and authorized distribution channels.
Complete Technical Specifications
- Catalog Number: 1794-IE8H
- Platform: Allen-Bradley FLEX I/O
- Number of Channels: 8 (individually configurable)
- Input Signal Types: 4–20 mA, 0–20 mA, ±20 mA (current); 0–10 V, ±10 V, 0–5 V, 1–5 V (voltage)
- Resolution: 16-bit (including sign bit)
- Conversion Method: Sigma-delta A/D
- Input Impedance (Voltage): ≥ 10 MΩ
- Input Impedance (Current): 249 Ω
- Accuracy: ±0.1% of full scale at 25 °C
- Temperature Drift: ±50 ppm/°C
- Update Rate: Configurable per channel (6.67 ms to 400 ms)
- Backplane Current Draw: 75 mA @ 5 V DC; 2 mA @ 24 V DC
- Field-Side Power: 24 V DC (supplied via terminal base)
- Operating Temperature: 0 °C to +55 °C (32 °F to 131 °F)
- Storage Temperature: −40 °C to +85 °C
- Relative Humidity: 5–95% non-condensing
- Isolation: 250 V AC continuous (channel-to-backplane)
- Certifications: UL, CE, C-Tick, FM Class I Div 2
- Dimensions (H × W × D): 94 mm × 23 mm × 87 mm
- Weight: Approx. 100 g
- Compatible Terminal Bases: 1794-TB3, 1794-TB3S, 1794-TB32, 1794-TBN
- Compatible Adapters: 1794-AENT, 1794-ACN15, 1794-ADNK, 1794-APB, 1794-ASB
Proven Application Environments
- Process Control: Flow, pressure, temperature, and level signal acquisition in oil & gas, chemical, and water treatment plants
- HVAC & Building Automation: Multi-zone sensor integration with BACnet/IP or EtherNet/IP gateways
- Energy Monitoring: Current transducer inputs for power metering and demand management systems
- OEM Machine Integration: High-density analog acquisition in packaging, printing, and food & beverage lines
- Pharmaceutical & Life Sciences: cGMP-compliant process monitoring with validated signal chains
- Automotive Manufacturing: Torque, force, and displacement sensor interfacing on assembly lines
Engineering Advantages
- High Channel Density: 8 channels in a 23 mm wide module — minimizes panel footprint vs. discrete signal conditioners
- Per-Channel Configurability: Each channel independently set for signal type, range, and filter — no hardware jumpers required
- 16-Bit Resolution: 65,536 counts across full scale — suitable for precision process loops and PID control
- Sigma-Delta Conversion: Inherent noise rejection and oversampling — superior performance in electrically noisy industrial environments
- Hot-Swap Capable: Module replacement without system shutdown when used with compatible terminal base
- Galvanic Isolation: 250 V AC channel-to-backplane isolation protects controller from field-side faults
- RSLogix 5000 / Studio 5000 Native: Full Add-On Profile (AOP) support — no custom EDS mapping required
System Architecture & Signal Flow
The 1794-IE8H mounts onto a FLEX I/O terminal base (e.g., 1794-TB3) which provides field wiring termination and backplane connectivity. Field sensors connect to the terminal base screw terminals; the module reads analog signals, performs 16-bit sigma-delta conversion, and transmits scaled engineering-unit data across the FLEX I/O backplane to the adapter module. The adapter (e.g., 1794-AENT) bridges the backplane to EtherNet/IP, delivering real-time process data to the ControlLogix or CompactLogix controller. Channel configuration (range, filter, alarm limits) is performed via RSLogix 5000 / Studio 5000 module properties — no DIP switches or hardware configuration required.
Sourcing & Quality Verification
- Source: Certified surplus and authorized distribution — all units traceable to original manufacturer or authorized reseller
- Inspection: Visual inspection, firmware version verification, and functional power-on test performed prior to shipment
- Packaging: ESD-safe anti-static bag + foam-lined carton; original Rockwell Automation packaging preserved where available
- Warranty: 12-month Konmask operational warranty covering manufacturing defects and functional failure
- Counterfeit Mitigation: Label authentication, date code verification, and PCB marking cross-check performed on every unit
Procurement Process
- Step 1 — Inquiry: Submit RFQ via product page or email support@konmask.com with quantity and required delivery date
- Step 2 — Quote: Receive itemized quotation within 1 business day including unit price, lead time, and shipping options
- Step 3 — Order Confirmation: Purchase order accepted via email, Alibaba Trade Assurance, or direct payment link
- Step 4 — Inspection & Dispatch: Pre-shipment inspection report issued; unit dispatched with tracking within 2 business days of payment
- Step 5 — After-Sales Support: Technical support available via email and WhatsApp (+86 198 5928 8691) for integration and commissioning queries
Technical FAQ
Q: Is the 1794-IE8H compatible with ControlLogix L8x series controllers?
A: Yes. When paired with a 1794-AENT adapter, the module communicates over EtherNet/IP and is fully supported in Studio 5000 v21 and later with the native AOP.
Q: Can I mix current and voltage inputs on the same module?
A: Yes. Each of the 8 channels is independently configurable for current or voltage input ranges via software — no hardware changes required.
Q: What is the maximum cable length for field wiring?
A: Rockwell recommends shielded twisted-pair cable up to 30 m (100 ft) for current inputs and up to 10 m (33 ft) for voltage inputs in standard industrial environments. Longer runs are possible with proper shielding and grounding practices.
Q: Does Konmask provide a test report with the unit?
A: Yes. A pre-shipment functional test report is available upon request. Contact support@konmask.com to include it with your order documentation.
Q: What is the lead time for stock units?
A: In-stock units ship within 2 business days. For bulk orders or units requiring additional testing, lead time is 5–7 business days. Contact us for real-time stock confirmation.
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