Allen-Bradley 1756-IA16 ControlLogix 16-Point 120V AC Digital Input Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1756-IA16 is a 16-point, 120V AC digital input module designed for the Rockwell Automation ControlLogix platform. It provides reliable field-device signal acquisition for industrial automation systems. This page serves as a comprehensive selection guide to help engineers identify direct replacements, compatible equivalents, and alternative sourcing options.
Technical Specifications
| Part Number | 1756-IA16 |
| Brand / Manufacturer | Allen-Bradley (Rockwell Automation) |
| Module Type | Digital Input (D/I) |
| Number of Points | 16 |
| Input Voltage | 120V AC (74–132V AC operating range) |
| Input Current | ≤ 10 mA per point (at 120V AC) |
| Signal Delay (ON) | ≤ 10 ms |
| Signal Delay (OFF) | ≤ 16.7 ms |
| Backplane Current (5V DC) | 120 mA |
| Isolation | Group isolated (8 points per group) |
| Connector Type | Removable Terminal Block (RTB) |
| Platform | ControlLogix 1756 chassis |
| Weight | ~350 g |
| Operating Temperature | 0°C to 60°C |
| Certifications | UL, CE, CSA |
Compatible Replacement & Equivalent Models
The following modules are direct or functional replacements for the 1756-IA16. Always verify firmware compatibility and chassis slot requirements before substitution.
- 1756-IA16I — Individually isolated 16-point 120V AC input; drop-in functional equivalent with enhanced isolation per point. Preferred upgrade for noise-sensitive environments.
- 1756-IA8D — 8-point 120V AC input with diagnostics; use when point count can be reduced and fault detection is required.
- 1756-IA32 — 32-point 120V AC input; suitable when consolidating two 1756-IA16 slots into one for higher-density applications.
- 1756-IB16 — 16-point 24V DC input; select when field devices are rewired to DC supply (requires power supply change).
- 1756-IB16I — 16-point 24V DC individually isolated input; modern DC equivalent with superior noise immunity.
- 1756-IA16 (Series B / C) — Later series revisions are backward compatible; confirm series letter when ordering for legacy systems.
Why Choose the Original Model
- Proven field reliability — Widely deployed in power generation, water treatment, and heavy manufacturing since the early ControlLogix era.
- 120V AC native compatibility — Directly interfaces with standard industrial AC field devices (pushbuttons, limit switches, proximity sensors) without signal conditioning.
- Group isolation architecture — Reduces wiring complexity while providing adequate isolation for most industrial environments.
- Broad spare-parts availability — Extensive installed base ensures long-term availability of new, refurbished, and surplus units.
- Seamless Studio 5000 integration — Native Add-On Profile (AOP) support for rapid commissioning and diagnostics in Logix Designer.
Typical Applications
- Motor control center (MCC) status monitoring via 120V AC auxiliary contacts
- Limit switch and position sensor feedback in conveyor and material handling systems
- Pushbutton and selector switch inputs on operator control panels
- Valve position feedback (open/closed) in process piping systems
- Level switch and flow switch monitoring in water/wastewater treatment
- Safety interlock signal acquisition (non-SIL rated; use 1756-IB16I for SIL applications)
System Compatibility
- Chassis: All 1756 ControlLogix chassis (4, 7, 10, 13, 17-slot)
- Controllers: 1756-L6x, 1756-L7x, 1756-L8x series (all ControlLogix generations)
- Software: RSLogix 5000 v13+, Studio 5000 Logix Designer v21+
- Power Supplies: 1756-PA72, 1756-PB72, 1756-PA75, 1756-PB75 and compatible variants
- Not compatible with: CompactLogix (1769), SLC 500 (1746), or MicroLogix platforms
Selection Guide
Use the decision matrix below to confirm the correct module for your application:
- Field voltage is 120V AC + 16 points needed + standard isolation? → 1756-IA16 ✓ (this module)
- Field voltage is 120V AC + 16 points + per-point isolation required? → 1756-IA16I
- Field voltage is 120V AC + 32 points in one slot? → 1756-IA32
- Field voltage is 120V AC + diagnostics needed? → 1756-IA8D (8-pt) or 1756-IA16I
- Field voltage is 24V DC + 16 points? → 1756-IB16 or 1756-IB16I
- Replacing a failed unit in an existing system? → Match series letter; 1756-IA16 Series B/C are interchangeable in most configurations
Quality Assurance & Sourcing
- New surplus & factory-sealed units available with original Rockwell Automation packaging
- All modules undergo functional power-on testing prior to shipment
- Traceability documentation (date codes, series letters) provided on request
- Refurbished units available with 12-month warranty; new units carry manufacturer warranty
- Export compliance: ECCN EAR99 — no export license required for most destinations
- Konmask.com sources from authorized distributors and verified industrial surplus channels
How to Order
- Part Number: 1756-IA16
- Specify: Quantity, required series (if known), new or refurbished condition preference
- Lead Time: In-stock units ship within 1–3 business days; contact us for volume orders
- Payment: T/T (wire transfer), PayPal, credit card via secure checkout
- RFQ / Bulk Inquiry: Email support@konmask.com or call +0086 19859288691
- Online Order: Add to cart directly on this page for standard quantities
Replacement & Compatibility FAQ
Q: Can I replace a 1756-IA16 with a 1756-IA16I without changing wiring?
A: Yes. The 1756-IA16I uses the same RTB connector and slot footprint. No wiring changes are required; only the module configuration in Studio 5000 needs to be updated to reflect the new catalog number.
Q: Is the 1756-IA16 compatible with GuardLogix controllers?
A: Yes for standard (non-safety) I/O tasks. It cannot be used as a safety-rated input module. Use 1756-IB16I or dedicated safety modules for SIL-rated loops.
Q: What is the difference between Series A, B, and C?
A: Series revisions reflect hardware improvements by Rockwell Automation. Series B and C are functionally interchangeable with Series A in most applications. Always verify with your system integrator for critical installations.
Q: Can this module be used in a redundant ControlLogix system?
A: Yes. The 1756-IA16 is supported in ControlLogix redundancy configurations when paired with compatible 1756-RM2 redundancy modules and appropriate firmware.
Q: Do you provide a certificate of conformance or test report?
A: Yes. Functional test reports and certificates of conformance are available upon request for all units shipped from Konmask.com.
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