Allen-Bradley 1746-IN16 24V AC/DC Input Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1746-IN16 is a 16-point, 24V AC/DC discrete input module designed for the SLC 500 programmable controller platform. This page provides full technical specifications, compatible replacement options, equivalent models, and a structured selection guide to help engineers and procurement teams make confident sourcing decisions.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 1746-IN16 |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Module Type | Discrete Input |
| Number of Inputs | 16 Points |
| Input Voltage | 24V AC/DC |
| Input Current (per point) | Approx. 8 mA @ 24V DC |
| ON-State Voltage Range | 14–26.4V DC / 14–26.4V AC |
| OFF-State Voltage Max | 5V |
| Input Impedance | Approx. 3 kΩ |
| Isolation | Optical (500V AC) |
| Backplane Current (5V DC) | 75 mA |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Dimensions (H × W × D) | Standard SLC 500 single-slot module |
| Weight | Approx. 300 g |
| Certifications | UL, CE, CSA |
| Platform Compatibility | SLC 500 (1746 I/O system) |
Compatible Replacement & Equivalent Models
When the original 1746-IN16 is unavailable or end-of-life, the following models are commonly evaluated as replacements. Always verify electrical and mechanical compatibility before substitution.
| Model | Manufacturer | Points | Voltage | Notes |
|---|---|---|---|---|
| 1746-IN16 (OEM) | Allen-Bradley | 16 | 24V AC/DC | Original — preferred for full compatibility |
| 1746-IB16 | Allen-Bradley | 16 | 24V DC (sink) | DC-only; confirm field wiring polarity |
| 1746-IA16 | Allen-Bradley | 16 | 120V AC | Higher voltage — not a direct swap |
| IC693MDL645 | GE Fanuc | 16 | 24V DC | Cross-platform; requires adapter or rewire |
| Q-series QX40 | Mitsubishi | 16 | 24V DC | Different platform; engineering review required |
| SM321 (6ES7321-1BH02) | Siemens S7-300 | 16 | 24V DC | Cross-platform; not plug-compatible |
⚠ Cross-brand replacements require full engineering review. Contact support@konmask.com for compatibility assessment.
Why Choose the Original Model
- Guaranteed SLC 500 backplane compatibility — no firmware or configuration changes required.
- Dual AC/DC input capability — accepts both AC and DC field signals on the same module, reducing wiring complexity.
- Optical isolation — protects the controller backplane from field-side transients and noise.
- Proven reliability in continuous industrial environments with decades of field deployment history.
- Direct RSLogix 500 / Studio 5000 support — no custom I/O configuration required.
Typical Applications
- Discrete sensor signal acquisition (proximity switches, limit switches, push buttons)
- Machine tool and conveyor control systems
- Packaging line automation
- Building automation and HVAC control panels
- Water/wastewater treatment plant I/O expansion
- Legacy SLC 500 system maintenance and spare parts management
System Compatibility
- Controller Platform: Allen-Bradley SLC 500 (all SLC 5/01, 5/02, 5/03, 5/04, 5/05 processors)
- Chassis: 1746-A4, 1746-A7, 1746-A10, 1746-A13 (all standard SLC 500 chassis)
- Programming Software: RSLogix 500, RSLogix Micro
- Communication: Via SLC 500 backplane (DH+, DH-485, EtherNet/IP depending on processor)
- Not compatible with: ControlLogix (1756), CompactLogix (1769), or MicroLogix 1100/1400 I/O systems
Selection Guide
Use the following criteria to confirm the 1746-IN16 is the correct module for your application:
- ✅ Platform: Your controller is an SLC 500 series (1746 backplane)
- ✅ Field Voltage: Field devices operate at 24V AC or 24V DC
- ✅ Point Count: You require exactly 16 discrete input points per slot
- ✅ Signal Type: Discrete (on/off) — not analog, not high-speed counter
- ⚠ If you need DC-only sinking inputs: Consider 1746-IB16 instead
- ⚠ If you need DC-only sourcing inputs: Consider 1746-IV16 instead
- ⚠ If you need 8 points: Consider 1746-IN8
Not sure which module fits your system? Send your rack layout or I/O list to support@konmask.com for a free selection review.
Quality Assurance & Sourcing
- Source: Genuine Allen-Bradley / Rockwell Automation OEM stock and certified refurbished units
- Inspection: All modules undergo functional power-on testing and visual inspection before shipment
- Condition options: New (factory sealed), Surplus New (unused, original packaging), Refurbished (tested, warranted)
- Warranty: 12-month warranty on all units; extended warranty available on request
- Traceability: Batch records and test reports available for critical infrastructure projects
- Export compliance: ECCN classification and export documentation available for international orders
How to Order
- Online: Add to cart directly on this page — stock availability shown in real time
- Email RFQ: support@konmask.com — include quantity, required condition, and delivery timeline
- Phone/WhatsApp: +0086 19859288691
- Bulk / OEM orders: Volume pricing available for orders of 5+ units — contact us for a quote
- Lead time: In-stock orders ship within 1–3 business days; expedited shipping available
Replacement & Compatibility FAQ
Q: Can I use the 1746-IN16 in a ControlLogix (1756) chassis?
A: No. The 1746 I/O system is exclusive to the SLC 500 backplane. ControlLogix uses the 1756 I/O family.
Q: Is the 1746-IN16 still in production?
A: Rockwell Automation has announced end-of-life for portions of the SLC 500 line. However, surplus and refurbished stock remains widely available. Contact us for current availability.
Q: Can I mix AC and DC field devices on the same 1746-IN16 module?
A: Yes — the 1746-IN16 accepts both 24V AC and 24V DC signals, making it flexible for mixed field wiring scenarios.
Q: What is the difference between 1746-IN16 and 1746-IB16?
A: The 1746-IN16 accepts both AC and DC inputs; the 1746-IB16 is DC-only (sinking). If your field devices are exclusively 24V DC, either may work — verify wiring polarity for the IB16.
Q: Do you provide test reports or certificates of conformance?
A: Yes. Test reports and CoC documents are available upon request for all units.
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Contact: support@konmask.com | +0086 19859288691
