Allen-Bradley 1746-IA16 SLC 16-Point AC Input Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1746-IA16 is a 16-point AC discrete input module designed for the SLC 500 modular I/O system. It accepts 100–120V AC field signals and interfaces directly with SLC 5/01, 5/02, 5/03, 5/04, and 5/05 processors. This page provides full technical specifications, compatible replacement options, application guidance, and sourcing information to help engineers and procurement teams make confident decisions.
Technical Specifications
- Part Number: 1746-IA16
- Manufacturer: Allen-Bradley / Rockwell Automation
- Series: SLC 500 Modular I/O
- Number of Inputs: 16 points
- Input Voltage: 100–120V AC, 50/60 Hz
- Input Current: 10 mA @ 120V AC (nominal)
- ON-State Voltage Range: 74–132V AC
- OFF-State Voltage Max: 20V AC
- Input Impedance: ~12 kΩ @ 60 Hz
- Isolation: Optical isolation between field and backplane
- Backplane Current Draw: 185 mA @ 5V DC
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Storage Temperature: -40°C to 85°C
- Relative Humidity: 5–95% non-condensing
- Dimensions (H × W × D): 111 × 44 × 87 mm (approx.)
- Weight: ~450 g
- Certifications: UL, CSA, CE
- Wiring Style: Removable terminal block (RTB)
Compatible Replacement & Equivalent Models
The following modules are commonly evaluated as replacements or equivalents for the 1746-IA16. Always verify electrical and mechanical compatibility before substitution.
- 1746-IA16 (New / Refurbished): Direct OEM replacement — no configuration changes required.
- 1746-IA8: 8-point AC input variant; use two units to match 16-point capacity.
- 1746-IM16: 200–240V AC input module — suitable if field voltage is 220V AC instead of 120V AC.
- 1746-IB16: 24V DC input module — requires field wiring and power supply changes; functionally equivalent logic-side.
- 1746-IV16: 10–30V DC input — for low-voltage DC field devices.
- Third-party SLC-compatible modules: Certain automation component suppliers offer SLC 500-compatible I/O modules with identical backplane pinouts. Confirm firmware compatibility and Rockwell certification status before deployment.
Note: Rockwell Automation has announced end-of-life for the SLC 500 platform. Konmask.com maintains stock of both new and tested-surplus 1746-IA16 units to support legacy system maintenance.
Why Choose the Original 1746-IA16
- Guaranteed Backplane Compatibility: Plug-and-play with all SLC 500 modular chassis (1746-A4, A7, A10, A13).
- No Software Reconfiguration: RSLogix 500 recognizes the module natively — no I/O tree changes needed.
- Proven Field Reliability: Millions of installed units across global manufacturing facilities.
- Optical Isolation: Protects the processor from field-side voltage transients and noise.
- Removable Terminal Block: Enables fast module swap without rewiring field devices.
- Regulatory Compliance: UL/CSA/CE listed for use in industrial control panels.
Typical Applications
- Monitoring AC-powered pushbuttons, selector switches, and limit switches on machine tools
- Reading status signals from motor starters, contactors, and relay outputs
- Interfacing with AC proximity sensors and photoelectric sensors (120V AC output type)
- Process control panels in food & beverage, automotive, and material handling lines
- Legacy SCADA and DCS integration where SLC 500 acts as a remote I/O node
- Retrofit and maintenance projects requiring drop-in module replacement
System Compatibility
- Compatible Processors: SLC 5/01 (1747-L511/L514), SLC 5/02 (1747-L524), SLC 5/03 (1747-L531/L532/L533), SLC 5/04 (1747-L541/L542/L543), SLC 5/05 (1747-L551/L552/L553)
- Compatible Chassis: 1746-A4 (4-slot), 1746-A7 (7-slot), 1746-A10 (10-slot), 1746-A13 (13-slot)
- Programming Software: RSLogix 500 (v1.0 and above), RSLogix Micro
- Communication: Via SLC backplane; no dedicated network port
- Power Supply Compatibility: 1746-P1, P2, P3, P4 series SLC power supplies
Selection Guide
Use the following criteria to confirm the 1746-IA16 is the correct module for your application, or to identify the best alternative:
- Field Voltage = 100–120V AC? → 1746-IA16 is the correct choice.
- Field Voltage = 200–240V AC? → Select 1746-IM16 instead.
- Field Voltage = 24V DC? → Select 1746-IB16 (sinking) or 1746-IB16X (sourcing).
- Need only 8 inputs? → Consider 1746-IA8 to reduce cost and slot usage.
- Migrating to ControlLogix/CompactLogix? → Evaluate 1756-IA16 or 1769-IA16 as platform-upgrade equivalents.
- Budget-constrained maintenance? → Tested-surplus 1746-IA16 units from Konmask.com offer a cost-effective solution with functional verification.
Quality Assurance & Sourcing
- Source: Authorized distributors, OEM surplus, and verified secondary market channels.
- Inspection: Each unit undergoes visual inspection, label verification, and functional bench testing prior to shipment.
- Condition Options: New-in-box (NIB), factory-refurbished, and tested-surplus available — clearly labeled on each listing.
- Traceability: Batch records and supplier documentation available upon request for critical applications.
- Warranty: 12-month warranty on all units shipped from Konmask.com.
- Counterfeit Prevention: All modules inspected against known OEM markings, firmware revision labels, and PCB characteristics.
How to Order
- Part Number: 1746-IA16
- Add to cart directly from this page, or contact us for bulk/project pricing.
- Lead Time: In-stock units ship within 1–3 business days; special orders quoted within 24 hours.
- Payment: T/T (bank transfer), PayPal, credit card, and trade account terms available.
- Export: International shipping available; export documentation (CO, packing list, commercial invoice) provided.
- Contact: support@konmask.com | +0086 19859288691
Replacement & Compatibility FAQ
Q: Can I use a 1746-IB16 as a direct replacement for the 1746-IA16?
A: Not directly. The IB16 accepts 24V DC signals, while the IA16 accepts 100–120V AC. Field wiring and power supply changes are required. Logic-side behavior is identical once configured.
Q: Is the 1746-IA16 still in production?
A: Rockwell Automation has placed the SLC 500 platform on end-of-life status. New production has ceased, but Konmask.com maintains stock of new and surplus units to support ongoing maintenance needs.
Q: Will the 1746-IA16 work in a fixed SLC 500 controller (e.g., 1747-L20)?
A: No. The 1746-IA16 is designed for the SLC 500 modular chassis system. Fixed (micro) SLC controllers use integrated I/O and do not accept expansion modules of this type.
Q: What is the difference between 1746-IA16 and 1746-IA16-CC?
A: The “-CC” suffix denotes a conformal-coated version for use in humid or corrosive environments. Electrically and functionally identical; select -CC for harsh-environment installations.
Q: Can I mix 1746-IA16 and 1746-IM16 modules in the same chassis?
A: Yes. SLC 500 modular chassis support mixed I/O modules in any slot. Ensure your power supply budget accommodates the combined backplane current draw.
Q: How do I verify a 1746-IA16 is genuine?
A: Check the Rockwell Automation catalog label, date code, and PCB revision markings. Konmask.com provides inspection documentation and sourcing records upon request.
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Contact: support@konmask.com | +0086 19859288691
