Discrete Input Automation Solution — Allen-Bradley 1794-IA8 | FLEX I/O Series
Where This Product Is Used
The Allen-Bradley 1794-IA8 is an 8-point, 120V AC digital input module from the FLEX I/O platform, engineered for demanding industrial environments where reliable discrete signal acquisition is critical. Engineers and system integrators specify this module across a wide range of applications:
- Conveyor & Material Handling Systems — Monitors proximity sensors, limit switches, and photoelectric sensors along conveyor lines to coordinate start/stop logic and jam detection.
- Packaging Machinery — Captures discrete signals from position sensors, door interlocks, and product-present detectors in high-speed packaging lines.
- Water & Wastewater Treatment Plants — Reads float switches, valve position feedback, and pump run/fault signals in SCADA-integrated control panels.
- Food & Beverage Processing — Interfaces with sanitary-grade sensors in wash-down environments, supporting CIP cycle monitoring and safety interlock logic.
- Automotive Assembly Lines — Acquires tooling confirmation signals, fixture clamp status, and part-present inputs in high-cycle-rate body-shop and powertrain applications.
- Oil & Gas Wellhead & Skid Control — Monitors field-level discrete inputs from pressure switches and level sensors in remote RTU/PLC panels.
- HVAC & Building Automation — Integrates with damper end-switches, fan status contacts, and fire/smoke detector dry contacts in BAS panels.
Technical Specifications
| Parameter | Value |
|---|---|
| Catalog Number | 1794-IA8 |
| Platform | Allen-Bradley FLEX I/O |
| Input Points | 8 (isolated groups of 4) |
| Input Voltage | 74–132V AC (nominal 120V AC) |
| Input Frequency | 47–63 Hz |
| ON-State Voltage | 74–132V AC |
| OFF-State Voltage | 0–20V AC (max) |
| ON-State Current | 5 mA min @ 74V AC |
| Input Impedance | ~14 kΩ @ 60 Hz |
| Backplane Current (5V DC) | 75 mA |
| Power Dissipation | 2.5 W max |
| Operating Temperature | 0 to 55°C (32 to 131°F) |
| Storage Temperature | -40 to 85°C |
| Relative Humidity | 5–95% non-condensing |
| Enclosure Rating | Open (panel-mount) |
| Dimensions (H × W × D) | 94 × 23 × 87 mm (approx.) |
| Weight | ~300 g |
| Wiring | Removable terminal block (RTB) |
| Backplane Compatibility | 1794-TB3, 1794-TB3S, 1794-TB32, 1794-TB62 |
Why Engineers Specify This Model
- Modular FLEX I/O Architecture — Snap-on installation onto any 1794 adapter (DeviceNet, ControlNet, EtherNet/IP, PROFIBUS) without rewiring the backplane.
- Isolated Input Groups — Two groups of 4 isolated inputs allow mixed-voltage field devices on the same module without ground-loop interference.
- Removable Terminal Block (RTB) — Field wiring stays in place when the module is swapped, minimizing downtime during maintenance or replacement.
- Compact DIN-Rail Footprint — 23 mm wide profile maximizes panel density in space-constrained enclosures.
- Broad Adapter Compatibility — Works with the full FLEX I/O adapter family, protecting existing infrastructure investments when migrating networks.
- Proven Field Reliability — Widely deployed since the 1990s; extensive installed base means readily available spare parts and deep community knowledge.
Complete System Bill of Materials
A typical FLEX I/O node using the 1794-IA8 requires the following components:
- 1794-IA8 — 8-point 120V AC digital input module (this item)
- 1794-AENT / 1794-ADN / 1794-ACN15 — Network adapter (EtherNet/IP, DeviceNet, or ControlNet)
- 1794-TB3 or 1794-TB3S — Removable terminal block (3-wire or spring-clamp)
- 1794-PS13 or 1794-PS3 — FLEX I/O power supply (if not bus-powered)
- 1756-L8x / 1769-L3x — ControlLogix or CompactLogix PLC (host controller)
- DIN rail, enclosure, and 24V DC auxiliary power supply — Panel infrastructure
Compliance & Industry Standards
- UL Listed (UL 508)
- CE Marked — EMC Directive 2014/30/EU & Low Voltage Directive 2014/35/EU
- RoHS Compliant
- cUL Listed (Canadian market)
- ATEX / IECEx — consult factory for hazardous-location variants
- Manufactured under ISO 9001 quality management system
Quality Assurance & Sourcing
Konmask.com sources the 1794-IA8 through verified industrial distribution channels. Every unit offered is:
- Inspected for physical integrity, label authenticity, and firmware revision upon receipt
- Stored in ESD-safe, climate-controlled warehousing
- Shipped with original manufacturer packaging where available
- Traceable to documented supply-chain records
- Backed by our 90-day functional warranty against defects in materials and workmanship
We do not source from grey-market or unverified brokers. If you require a Certificate of Conformance (CoC) or test report, please contact us prior to ordering.
How to Source This Part
- Add to Cart — Click “Add to Cart” above and proceed to checkout. We accept T/T bank transfer, PayPal, and major credit cards.
- Request a Quote — For orders of 5+ units or project BOM pricing, email support@konmask.com with your quantity and delivery timeline.
- Lead Time — In-stock units ship within 1–3 business days. Out-of-stock units are sourced within 7–15 business days depending on availability.
- Export & Customs — We handle export documentation (commercial invoice, packing list, COO) for international shipments. DDP/DAP terms available on request.
Application-Specific FAQ
Q: Can the 1794-IA8 accept 24V DC inputs?
A: No. The 1794-IA8 is rated for 120V AC inputs only. For 24V DC discrete inputs, specify the 1794-IB8 (sink) or 1794-IB16 instead.
Q: Is the 1794-IA8 compatible with EtherNet/IP adapters?
A: Yes. It is fully compatible with the 1794-AENT and 1794-AENTR adapters, enabling integration with Studio 5000 Logix Designer via standard Add-On Profiles (AOPs).
Q: What is the maximum number of 1794-IA8 modules per adapter?
A: Up to 8 I/O modules can be connected per FLEX I/O adapter node, subject to backplane current budget constraints.
Q: Can I replace the module without removing field wiring?
A: Yes. The removable terminal block (RTB) stays in place; only the module body is swapped. This enables hot-swap replacement in many adapter configurations.
Q: Do you provide the 1794-TB3 terminal block with the module?
A: The RTB is sold separately. Please add the appropriate terminal block to your order or contact us for a bundled quote.
© 2026 Konmask.com. All rights reserved.
Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
