Allen-Bradley 1756-IA16I ControlLogix 16-Point 120V AC Digital Input Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1756-IA16I is a 16-point, 120V AC isolated digital input module designed for the Rockwell Automation ControlLogix platform. Each input point is individually isolated, making it ideal for high-noise industrial environments where signal integrity is critical. This guide covers technical specifications, compatible replacements, application scenarios, and selection criteria to help engineers and procurement teams make confident sourcing decisions.
Technical Specifications
- Part Number: 1756-IA16I
- Series: Allen-Bradley ControlLogix (1756 Series)
- Module Type: Digital Input (D/I)
- Number of Points: 16
- Input Voltage: 120V AC (74–132V AC operating range)
- Isolation: Point-to-point isolated (each channel individually isolated)
- Input Current: 10 mA at 120V AC (nominal)
- ON-State Voltage: 74–132V AC
- OFF-State Voltage: 0–20V AC
- Input Delay: Configurable (software selectable)
- Backplane Current: 120 mA at 5V DC; 3 mA at 24V DC
- Power Dissipation: 5.75W (max)
- 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): 94.0 × 94.0 × 58.4 mm (3.70 × 3.70 × 2.30 in)
- Weight: Approx. 350 g
- Certifications: UL, CE, CSA, C-Tick
- Catalog Number: 1756-IA16I
Compatible Replacement & Equivalent Models
When the 1756-IA16I is unavailable or end-of-life, the following models offer functional equivalence or direct drop-in replacement capability. Always verify firmware compatibility and chassis slot requirements before substitution.
- 1756-IA16 (Allen-Bradley) — Non-isolated 16-point 120V AC input; suitable when point-to-point isolation is not required. Lower cost alternative for benign electrical environments.
- 1756-IA8D (Allen-Bradley) — 8-point 120V AC input with diagnostics; use when fewer points with fault detection are preferred over 16-point density.
- 1756-IA32 (Allen-Bradley) — 32-point 120V AC input; higher density option when expanding I/O count within the same chassis slot budget.
- 1756-IM16I (Allen-Bradley) — 16-point 220V AC isolated input; direct functional equivalent for 220V AC field wiring environments.
- IC694MDL660 (GE Fanuc / Emerson) — 16-point 120V AC input module for PACSystems RX3i; cross-platform alternative requiring gateway or migration project.
- F3XD32-0N (Yokogawa) — DCS-side equivalent for mixed-platform installations; requires engineering adapter for ControlLogix backplane.
Note: Cross-brand replacements require system integration validation. Contact Konmask technical support for migration assistance.
Why Choose the Original 1756-IA16I
- Point-to-Point Isolation: Each of the 16 channels is independently isolated, preventing ground loops and cross-channel interference — critical in motor-drive and high-voltage switching environments.
- Native ControlLogix Integration: Plug-and-play with Studio 5000 Logix Designer; no additional configuration drivers required.
- Proven Field Reliability: Widely deployed in automotive, oil & gas, and water treatment industries with documented MTBF exceeding 500,000 hours.
- Diagnostic Visibility: Real-time channel-level diagnostics accessible via RSLogix 5000 / Studio 5000 for predictive maintenance workflows.
- Scalable Architecture: Supports ControlLogix redundancy configurations and hot-swap capability without process interruption.
Typical Applications
- Motor starter feedback and status monitoring (120V AC coil circuits)
- Limit switch and proximity sensor inputs in press and stamping lines
- Valve position feedback in oil & gas pipeline control systems
- Conveyor system interlocks and safety gate monitoring
- Water/wastewater pump station level switch inputs
- HVAC damper and fan status monitoring in building automation
- Power distribution panel status inputs in utility substations
System Compatibility
- Compatible Chassis: All 1756 ControlLogix chassis (1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17)
- Compatible Controllers: 1756-L6x, 1756-L7x, 1756-L8x series ControlLogix controllers
- Software: RSLogix 5000 v13.0+, Studio 5000 Logix Designer v21.0+
- Communication: Backplane communication via ControlBus; compatible with EtherNet/IP, ControlNet, and DeviceNet network configurations
- Redundancy: Supported in ControlLogix redundancy systems with 1756-RM2/A redundancy module
- Not Compatible With: CompactLogix (1769 series), MicroLogix, SLC 500, or PLC-5 platforms without migration hardware
Selection Guide
Use the decision matrix below to confirm the 1756-IA16I is the right module for your application:
- Field Voltage = 120V AC? → Yes: proceed. No: consider 1756-IM16I (220V AC) or 1756-IB16I (24V DC).
- Point-to-Point Isolation Required? → Yes: 1756-IA16I is correct. No: 1756-IA16 (lower cost).
- Point Count = 16? → Yes: 1756-IA16I. Need 8 with diagnostics: 1756-IA8D. Need 32: 1756-IA32.
- Redundancy System? → Confirm 1756-RM2/A is present; 1756-IA16I is fully supported.
- Hot-Swap Required? → Yes: 1756-IA16I supports removal/insertion under power (RIUP).
- Budget-Constrained? → Evaluate 1756-IA16 (non-isolated) if electrical environment permits.
Quality Assurance & Sourcing
- Authenticity: All units sourced through authorized distribution channels or verified surplus with full traceability documentation.
- Inspection: Each module undergoes visual inspection, label verification, and functional power-on testing prior to shipment.
- Condition Options: New (factory sealed), Refurbished (tested to OEM spec), and Surplus (used, tested) — specify at time of inquiry.
- Warranty: 12-month replacement warranty on all stocked units; extended warranty available on request.
- Lead Time: In-stock units ship within 1–3 business days; special orders 7–21 business days depending on origin.
- Export Compliance: ECCN classification and export documentation available for international orders.
How to Order
- Step 1: Confirm part number: 1756-IA16I (specify Series A, B, or C if known).
- Step 2: Specify quantity and required condition (New / Refurbished / Surplus).
- Step 3: Submit your RFQ via the product page, or contact us directly:
📧 support@konmask.com
📞 +0086 19859288691
🌐 https://Konmask.com
- Step 4: Receive quotation within 24 business hours with availability, pricing, and lead time confirmation.
- Step 5: Approve PO and confirm shipping address; tracking provided upon dispatch.
Replacement & Compatibility FAQ
Q: Can I replace a 1756-IA16I with a 1756-IA16 without reprogramming?
A: In most cases yes — the tag structure and I/O tree remain identical. However, the 1756-IA16 lacks point-to-point isolation, so verify your field wiring does not share common grounds across channels.
Q: Is the 1756-IA16I compatible with ControlLogix 5580 (L8x) controllers?
A: Yes. The 1756-IA16I is fully compatible with all ControlLogix generations including L6x, L7x, and L8x controllers running Studio 5000 v21+.
Q: What is the difference between 1756-IA16I and 1756-IM16I?
A: The 1756-IA16I accepts 120V AC inputs; the 1756-IM16I accepts 220V AC inputs. Both are 16-point isolated modules with identical form factor and backplane interface.
Q: Can this module be used in a redundant ControlLogix system?
A: Yes. The 1756-IA16I supports ControlLogix redundancy configurations when paired with the 1756-RM2/A redundancy module and appropriate chassis layout.
Q: Do you supply modules with firmware pre-loaded?
A: Firmware is managed by the ControlLogix controller, not the I/O module. No firmware pre-loading is required for the 1756-IA16I.
Q: What certifications does the 1756-IA16I carry?
A: UL Listed, CE Marked, CSA Certified, and C-Tick (RCM) compliant for global deployment.
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