Allen-Bradley 1794-IB16 Flex 16-Point Digital Input Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1794-IB16 is a 16-point, 24V DC digital input module from Rockwell Automation’s FLEX I/O platform. Designed for distributed I/O applications, it delivers reliable signal acquisition in compact panel and machine-level control architectures. This guide covers technical specifications, compatible replacements, selection criteria, and sourcing information to help engineers and procurement teams make informed decisions.
Technical Specifications
| Parameter | Specification |
|---|---|
| Catalog Number | 1794-IB16 |
| Platform | Allen-Bradley FLEX I/O |
| Module Type | Digital Input (DC) |
| Number of Inputs | 16 Points |
| Input Voltage | 24V DC (Sink/Source) |
| Input Current | 8 mA @ 24V DC (nominal) |
| ON-State Voltage | 10–30V DC |
| OFF-State Voltage | 0–5V DC |
| Input Delay | 1 ms (filter selectable) |
| Backplane Current Draw | 75 mA @ 5V DC |
| 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-style (requires enclosure) |
| Certifications | UL, CE, CSA |
| Dimensions (H×W×D) | 94 × 23 × 87 mm (approx.) |
| Weight | ~100 g |
Compatible Replacement & Equivalent Models
When the original 1794-IB16 is unavailable, end-of-life, or cost-prohibitive, the following alternatives are commonly evaluated. Always verify electrical compatibility and firmware support before substitution.
| Model | Brand | Points | Voltage | Notes |
|---|---|---|---|---|
| 1794-IB16D | Allen-Bradley | 16 | 24V DC | Diagnostic version of IB16; drop-in upgrade with fault detection |
| 1794-IB16XOB16 | Allen-Bradley | 16 IN / 16 OUT | 24V DC | Combo module; replaces IB16 + OB16 pair |
| 1794-IB8 | Allen-Bradley | 8 | 24V DC | Half-density; use two units to match 16-point capacity |
| 1734-IB16 | Allen-Bradley | 16 | 24V DC | POINT I/O platform; requires adapter change, not direct swap |
| IC693MDL645 | GE Fanuc | 16 | 24V DC | Cross-platform; requires I/O mapping reconfiguration |
| SM321 | Siemens S7-300 | 16 | 24V DC | Cross-platform; PLC program migration required |
| QX40 | Mitsubishi MELSEC-Q | 16 | 24V DC | Cross-platform; suitable for greenfield replacement projects |
Note: Cross-platform replacements require engineering review of backplane communication, addressing, and PLC program modifications.
Why Choose the Original Model
- Seamless FLEX I/O Integration: The 1794-IB16 is natively supported by all FLEX I/O adapters (1794-ADN, 1794-AENT, etc.) with zero configuration overhead.
- Studio 5000 / RSLogix 5000 Native Support: Full EDS file support, online diagnostics, and tag-based addressing without custom mapping.
- Proven Field Reliability: Widely deployed in automotive, food & beverage, and material handling industries with documented MTBF performance.
- Diagnostic Upgrade Path: Easily upgradeable to 1794-IB16D for enhanced fault isolation without hardware redesign.
- Compact Form Factor: 23 mm wide module maximizes panel density in space-constrained installations.
Typical Applications
- Conveyor and material handling systems
- Automotive assembly line control
- Packaging machinery and filling lines
- Water/wastewater treatment plant I/O
- Building automation and HVAC control panels
- Distributed I/O nodes in large-scale process control
- Machine safety interlocking (non-safety-rated; use 1791DS series for SIL applications)
System Compatibility
| Component | Compatible Part Numbers |
|---|---|
| FLEX I/O Adapters | 1794-ADN, 1794-ADNK, 1794-AENT, 1794-ACN15, 1794-ACNR15 |
| Terminal Bases | 1794-TB3, 1794-TB3S, 1794-TB32, 1794-TBN |
| Power Supplies | 1794-PS13, 1794-PS1 (field-side 24V DC required separately) |
| PLC Platforms | ControlLogix (1756), CompactLogix (1769), SoftLogix 5800 |
| Programming Software | Studio 5000 Logix Designer v21+, RSLogix 5000 v16+ |
| Network Protocols | DeviceNet, EtherNet/IP, ControlNet (adapter-dependent) |
Selection Guide
Use the following decision framework to select the correct digital input module for your application:
- Step 1 – Platform Lock-in: If your system is FLEX I/O, stay within the 1794 series. If migrating platforms, evaluate 1734 (POINT I/O) or 1756 (ControlLogix) for future scalability.
- Step 2 – Point Count: 16-point modules (IB16) suit medium-density applications. For high-density panels, consider 1794-IB32 (32-point).
- Step 3 – Diagnostics Requirement: Standard applications → 1794-IB16. Applications requiring open-wire/short-circuit detection → 1794-IB16D.
- Step 4 – Voltage Level: 24V DC sink/source → IB16. For 120V AC inputs → 1794-IA8 or 1794-IA16. For 240V AC → 1794-IM8.
- Step 5 – Environmental Rating: Standard panels → open-style 1794-IB16. Harsh/wash-down environments → consider IP67-rated remote I/O alternatives.
- Step 6 – Budget vs. Availability: New OEM stock preferred for critical systems. Certified refurbished units acceptable for non-critical or legacy maintenance applications.
Quality Assurance & Sourcing
- Authenticity Verification: All units sourced by Konmask.com are inspected for genuine Rockwell Automation markings, date codes, and firmware version consistency.
- Functional Testing: Modules undergo power-on self-test (POST) and I/O point verification prior to shipment.
- Packaging: Anti-static ESD bags with original or equivalent protective packaging.
- Warranty: 12-month replacement warranty against manufacturing defects.
- Traceability: Serial number and lot documentation available upon request for MRO and OEM procurement teams.
- Lead Time: In-stock units ship within 1–3 business days. Special orders: 5–15 business days.
How to Order
- Confirm your catalog number: 1794-IB16 (specify firmware revision if required).
- Indicate quantity and required delivery date.
- Provide your shipping address and preferred freight method (DHL / FedEx / sea freight).
- Request a formal quotation via support@konmask.com or use the Add to Cart function above.
- For bulk orders (>10 units) or OEM procurement, contact us directly for volume pricing.
Replacement & Compatibility FAQ
Q: Can I replace a 1794-IB16 with a 1794-IB16D without changing the program?
A: Yes. The 1794-IB16D is backward-compatible and uses the same I/O map. Additional diagnostic tags will appear in Studio 5000 but do not affect existing logic.
Q: Is the 1794-IB16 compatible with EtherNet/IP adapters?
A: Yes, when paired with the 1794-AENT adapter. The module itself is network-agnostic; the adapter determines the protocol.
Q: Can I use a 1734-IB16 (POINT I/O) as a direct replacement?
A: No. POINT I/O and FLEX I/O use different backplane architectures and adapters. A 1734-IB16 requires a 1734-AENT adapter and separate I/O tree configuration.
Q: What is the maximum number of 1794-IB16 modules per adapter?
A: Up to 8 modules per FLEX I/O adapter node (backplane current budget dependent).
Q: Do you supply refurbished units?
A: Yes. Certified refurbished units are available with full functional test reports. Please specify “refurbished” when requesting a quote.
Q: Can Konmask.com provide cross-reference support for Siemens or Mitsubishi equivalents?
A: Yes. Contact our technical team with your existing I/O list and PLC platform for a detailed cross-reference and migration assessment.
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