Allen-Bradley 1794-IV16 — 16-Point 24V DC Digital Input Module | FLEX I/O Platform
Engineering Background
The 1794-IV16 is part of Rockwell Automation’s FLEX I/O system — a modular, DIN-rail-mounted distributed I/O platform designed for integration with ControlLogix, CompactLogix, SLC 500, and PLC-5 controllers via a FLEX I/O adapter. Introduced to address the need for compact, high-density I/O in space-constrained panel environments, the FLEX I/O family has become a benchmark for distributed I/O architecture in North American industrial automation.
Product Positioning
The 1794-IV16 delivers 16 discrete 24V DC input points in a single compact module, making it the preferred choice for procurement engineers who need reliable signal acquisition from field devices — sensors, limit switches, pushbuttons, and proximity detectors — without sacrificing panel real estate. It is fully compatible with the FLEX I/O terminal base system and supports hot-swap capability when used with appropriate adapters.
Complete Technical Specifications
- Catalog Number: 1794-IV16
- Series: FLEX I/O
- Manufacturer: Allen-Bradley / Rockwell Automation
- Module Type: Digital Input (DC)
- Number of Input Points: 16
- Input Voltage: 24V DC (nominal)
- Input Voltage Range: 10–31.2V DC
- Input Current (per point): 8.0 mA @ 24V DC
- ON-State Voltage Minimum: 10V DC
- OFF-State Voltage Maximum: 5V DC
- ON-State Current Minimum: 2.0 mA
- OFF-State Current Maximum: 1.5 mA
- Input Delay (OFF→ON): 2 ms (max)
- Input Delay (ON→OFF): 2 ms (max)
- Isolation: 1500V AC (field side to backplane)
- Backplane Current: 75 mA @ 5V DC
- Power Dissipation: 3.0 W (max)
- 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)
- Enclosure Rating: Open type (requires enclosure)
- Dimensions (H × W × D): 94 × 23 × 87 mm (approx.)
- Weight: Approx. 100 g
- Certifications: UL, CE, CSA, C-Tick
- Compatible Terminal Base: 1794-TB3, 1794-TB3S, 1794-TB32, 1794-TBN, 1794-TBNF
- Compatible Adapters: 1794-ADN, 1794-AENT, 1794-APB, 1794-ASB, 1794-ACNR15
Proven Application Environments
- Automotive Assembly Lines: Discrete signal acquisition from proximity sensors and end-of-travel switches on robotic cells
- Food & Beverage Processing: Monitoring conveyor position sensors, door interlocks, and level switches in hygienic environments
- Water & Wastewater Treatment: Remote I/O nodes for pump status, valve position feedback, and flow switch monitoring
- Oil & Gas Upstream/Midstream: Distributed panel I/O for wellhead control and pipeline monitoring systems
- Material Handling & Warehousing: Pallet detection, sorter divert confirmation, and conveyor jam sensing
- Building Automation & HVAC: Integration with BAS controllers for occupancy, damper position, and alarm input aggregation
- Machine Tool & OEM Equipment: High-density input acquisition in compact control panels with limited DIN-rail space
Engineering Advantages
- High-Density I/O: 16 input points in a single 23 mm-wide module — maximizes panel density without sacrificing signal integrity
- Hot-Swap Capable: Supports module replacement under power (adapter-dependent) — minimizes unplanned downtime during maintenance windows
- Optical Isolation: 1500V AC field-to-backplane isolation protects controller backplane from field-side transients and ground loops
- Wide Input Voltage Window: 10–31.2V DC input range accommodates real-world voltage sag and surge conditions in industrial field wiring
- Fast Response Time: ≤2 ms ON/OFF delay ensures accurate capture of high-speed discrete events without missed transitions
- Universal Terminal Base Compatibility: Works with the full 1794-TB terminal base family — no proprietary wiring adapters required
- Scalable Architecture: FLEX I/O allows up to 8 modules per adapter node — scale I/O density without adding network nodes
- Proven Longevity: Long-running catalog item with broad spare-parts availability and extensive field documentation
System Architecture & Signal Flow
The 1794-IV16 mounts onto a FLEX I/O terminal base (e.g., 1794-TB3), which provides the field wiring terminals and backplane connection. The terminal base connects to a FLEX I/O adapter (e.g., 1794-AENT for EtherNet/IP, 1794-ADN for DeviceNet) that bridges the I/O module to the controller network. Signal flow is as follows:
Field Device → Terminal Base Wiring → 1794-IV16 Input Circuit → Optical Isolation → Backplane → FLEX Adapter → Controller Network (EtherNet/IP / DeviceNet / ControlNet / DH-485) → ControlLogix / CompactLogix / SLC 500 Controller
Each input point is individually addressable in the controller’s I/O image table. Input data is transmitted to the controller at the adapter’s RPI (Requested Packet Interval), configurable from 1 ms to 750 ms depending on the adapter type and network load.
Sourcing & Quality Verification
- Stock Origin: Sourced from verified surplus channels, authorized distributors, and decommissioned OEM equipment — all units inspected prior to listing
- Inspection Protocol: Visual inspection for physical damage, label integrity, and firmware/series verification; functional testing available on request
- Authenticity: All Allen-Bradley catalog numbers are cross-referenced against Rockwell Automation’s published catalog data; counterfeit screening applied
- Packaging: Ships in anti-static packaging with original documentation where available; ESD-safe handling throughout fulfillment
- Warranty: 90-day operational warranty against defects in materials and workmanship; extended warranty available upon request
- Traceability: Lot and serial number documentation provided for quality-critical procurement requirements
Procurement Process
- Step 1 — Inquiry: Contact support@konmask.com or call +0086 19859288691 with your required quantity, delivery timeline, and any special inspection requirements
- Step 2 — Quote: Receive a formal quotation within 1 business day including unit price, lead time, shipping options, and payment terms
- Step 3 — Order Confirmation: Submit PO or confirm order via email; proforma invoice issued for prepayment orders
- Step 4 — Inspection & Dispatch: Units inspected, photographed, and packed; tracking number provided within 24–48 hours of payment clearance
- Step 5 — Delivery & Support: Post-delivery technical support available; returns accepted within 30 days for units in original condition
Accepted Payment Methods: T/T (Bank Wire), PayPal, Western Union, Trade Assurance (Alibaba). Credit terms available for qualified accounts.
Technical FAQ
Q: Can the 1794-IV16 be used with a ControlLogix system?
A: Yes. Pair it with a 1794-AENT (EtherNet/IP) or 1794-ACNR15 (ControlNet) adapter and add the module to your ControlLogix I/O tree via Studio 5000 Logix Designer.
Q: What terminal base is required?
A: The 1794-IV16 requires a 16-point FLEX I/O terminal base. Compatible bases include 1794-TB3, 1794-TB3S, 1794-TB32, 1794-TBN, and 1794-TBNF. The terminal base must be ordered separately.
Q: Is the module compatible with 120V AC input signals?
A: No. The 1794-IV16 is a 24V DC input module only. For 120V AC inputs, refer to the 1794-IA16 (120V AC, 16-point input module).
Q: What is the maximum number of 1794-IV16 modules per adapter?
A: Up to 8 FLEX I/O modules can be connected to a single adapter, subject to backplane current budget constraints. Verify total backplane current draw does not exceed the adapter’s rated output.
Q: Can I replace the module without powering down the system?
A: Hot-swap capability depends on the adapter used. The 1794-AENT and 1794-ADN adapters support hot-swap; verify with your specific adapter’s user manual before performing live replacement.
Q: What programming software is required?
A: Studio 5000 Logix Designer (ControlLogix/CompactLogix), RSLogix 500 (SLC 500), or RSLogix 5 (PLC-5), depending on your controller platform. The module does not require separate configuration — it is auto-configured by the adapter.
Q: Do you provide the EDS file for DeviceNet integration?
A: Yes. The EDS file for the 1794-IV16 is available from Rockwell Automation’s Product Compatibility and Download Center (PCDC). We can assist with sourcing the correct EDS file upon request.
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