Allen-Bradley 1756-IG16 ControlLogix Digital Input Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1756-IG16 is a 16-point, 10–30V DC digital input module designed for the Rockwell Automation ControlLogix platform. It provides high-density, isolated DC input capability for demanding industrial automation environments. Whether you are sourcing an original unit, evaluating compatible replacements, or selecting the right module for a new system, this guide covers everything you need.
Technical Specifications
- Part Number: 1756-IG16
- Platform: Allen-Bradley ControlLogix (1756 chassis)
- Input Points: 16 points (isolated)
- Input Voltage Range: 10–30V DC
- Input Current (nominal): 8.0 mA @ 24V DC
- ON-State Voltage Min: 10V DC
- OFF-State Voltage Max: 5V DC
- Isolation: Group isolated (16 points / group)
- Backplane Current: 75 mA @ 5V DC; 2 mA @ 24V DC
- Power Dissipation: 4.5 W max
- Operating Temperature: 0–60°C (32–140°F)
- Dimensions (H × W × D): 94.0 × 94.0 × 58.0 mm
- Weight: ~0.23 kg
- Certifications: UL, CE, CSA, C-Tick
- Wiring: Removable terminal block (RTB), 20-pin
Compatible Replacement & Equivalent Models
The following modules are commonly evaluated as replacements or functional equivalents for the 1756-IG16. Always verify electrical and firmware compatibility before substitution.
- 1756-IB16 — 16-point, 10–31.2V DC, non-isolated; most common direct alternative for standard DC input applications
- 1756-IB16D — 16-point DC input with diagnostics; recommended when fault detection is required
- 1756-IB32 — 32-point, 10–31.2V DC; use when higher density is needed in the same chassis slot
- 1756-IC16 — 16-point, 48V DC input; select when field devices operate at 48V DC
- 1756-IM16I — 16-point, 100–240V AC isolated input; for AC field device environments
- 1756-IV16 — 16-point, 10–265V AC/DC TTL-compatible; versatile voltage range
- Third-party equivalents: Siemens ET 200SP DI 16×24VDC, Schneider Electric Modicon X80 DDI1602, Mitsubishi QX40 — functional equivalents for cross-brand migration projects (adapter/gateway required)
Why Choose the Original 1756-IG16
- True group isolation: All 16 inputs share a single isolated common, eliminating ground loop interference in multi-source field wiring
- Rockwell native integration: Full Studio 5000 / RSLogix 5000 tag-based programming with no additional configuration overhead
- Proven field reliability: Widely deployed in automotive, oil & gas, and food & beverage lines with documented MTBF performance
- Firmware continuity: Seamless firmware updates via ControlLogix chassis without module removal
- Warranty & OEM support: Eligible for Rockwell TechConnect support contracts
Typical Applications
- Discrete sensor feedback (proximity switches, limit switches, photoelectric sensors)
- Push-button and selector switch status monitoring
- Safety interlock signal acquisition (non-SIL; use 1756-IB16I for SIL-rated loops)
- Conveyor and material handling control systems
- Automotive body-in-white and paint shop automation
- Oil & gas wellhead and pipeline monitoring panels
- Pharmaceutical and food & beverage process lines requiring isolated inputs
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 all standard 1756 PSUs
- Not compatible with: CompactLogix (1769), MicroLogix, or SLC 500 chassis
Selection Guide
Use the decision matrix below to confirm the 1756-IG16 is the right choice, or identify the best alternative:
- Need 16-point isolated 24V DC input → 1756-IG16 (this module)
- Need 16-point non-isolated 24V DC input at lower cost → 1756-IB16
- Need diagnostics (open-wire, short detection) → 1756-IB16D
- Need 32 points in one slot → 1756-IB32
- Field devices run at 48V DC → 1756-IC16
- Field devices run at 120/240V AC → 1756-IM16I
- Mixed AC/DC field wiring → 1756-IV16
- SIL 2 safety loop required → 1756-IB16I (Safety module)
Quality Assurance & Sourcing
- Origin: Genuine Allen-Bradley / Rockwell Automation manufactured units
- Condition options: New-in-box (NIB), Surplus new, Tested & refurbished — specify at inquiry
- Inspection: Each unit undergoes functional power-on test and visual inspection before shipment
- Traceability: Serial number and date code recorded; COC available on request
- Packaging: Anti-static bag + foam-lined carton; ESD-safe handling throughout
- Lead time: In-stock units ship within 1–3 business days; contact us for bulk order scheduling
How to Order
- Confirm your chassis slot count and available backplane current budget
- Verify field device voltage (10–30V DC) and isolation requirement
- Select condition: New / Surplus / Refurbished
- Add to cart or contact [email protected] for a formal quotation
- Provide PO number, shipping address, and required delivery date
- For bulk orders (>5 units), request a volume discount quote
Replacement & Compatibility FAQ
Q: Can I replace a 1756-IG16 with a 1756-IB16 without changing my program?
A: Yes, in most cases. Both modules use the same tag structure in Studio 5000. However, the 1756-IB16 is non-isolated — verify that your field wiring commons are compatible before substitution.
Q: Is the 1756-IG16 compatible with the 1756-L85E controller?
A: Yes. The 1756-IG16 is compatible with all ControlLogix L8x series controllers running Studio 5000 v21 or later.
Q: What is the difference between 1756-IG16 and 1756-IB16I?
A: The 1756-IB16I is a safety-rated (SIL 2) isolated input module for use in GuardLogix safety systems. The 1756-IG16 is a standard (non-safety) isolated input module for ControlLogix.
Q: Can I use a third-party equivalent in a Rockwell system?
A: Third-party modules require an EtherNet/IP adapter or gateway and custom Add-On Instructions (AOI). This adds engineering effort and may affect warranty. We recommend original Rockwell modules for production-critical systems.
Q: Do you provide a certificate of conformance (COC)?
A: Yes. COC is available upon request for all new and surplus units. Please specify at time of order.
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