Allen-Bradley 1756-IB32 ControlLogix 32-Point 12/24V DC Digital Input Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1756-IB32 is a 32-point, 12/24V DC digital input module designed for the Rockwell Automation ControlLogix platform. It provides high-density discrete input capability for demanding industrial automation applications. This page serves as a comprehensive selection, replacement, and compatibility reference for engineers and procurement teams sourcing the 1756-IB32 or its functional equivalents.
Technical Specifications
- Part Number: 1756-IB32
- Brand: Allen-Bradley / Rockwell Automation
- Platform: ControlLogix
- Module Type: Digital Input (D/I)
- Number of Points: 32
- Input Voltage: 12/24V DC
- Input Current: 2 mA @ 12V DC; 2 mA @ 24V DC (nominal)
- ON-State Voltage Range: 10–30V DC
- OFF-State Voltage Range: 0–5V DC
- Backplane Current: 120 mA @ 5V DC; 3 mA @ 24V DC
- Power Dissipation: 5.5 W (max)
- Isolation: 100V DC continuous (channel-to-backplane)
- Operating Temperature: 0–60°C (32–140°F)
- Dimensions (H × W × D): 94.0 × 94.0 × 58.0 mm (3.70 × 3.70 × 2.28 in)
- Weight: ~300 g
- Certifications: UL, CE, CSA, C-Tick
- RoHS Compliant: Yes
Compatible Replacement & Equivalent Models
When the 1756-IB32 is unavailable or discontinued, the following models may serve as direct or functional replacements depending on your system configuration:
- 1756-IB32 Series B / C — Direct series upgrade; fully backward compatible within ControlLogix chassis
- 1756-IB16 — 16-point variant; use two modules to replicate 32-point capacity
- 1756-IB16D — 16-point with diagnostics; suitable where fault detection is required
- 1756-IB32/A — Earlier revision; functionally equivalent in most applications
- 1769-IQ32 (CompactLogix) — Functional equivalent for CompactLogix platforms; not chassis-interchangeable
- Third-party equivalents — Some OEM-compatible modules exist; verify firmware and backplane compatibility before deployment
Note: Always verify firmware revision, chassis slot compatibility, and I/O tree configuration before substituting modules in a live system.
Why Choose the Original Model
- Native ControlLogix Integration: Plug-and-play with Studio 5000 / RSLogix 5000; no additional configuration drivers required
- Proven Reliability: Widely deployed in automotive, oil & gas, food & beverage, and utilities sectors globally
- Full Rockwell Support: Access to firmware updates, TechConnect support, and lifecycle management
- Diagnostic Transparency: Real-time module status via RSLinx and Studio 5000 diagnostics
- Long-term Availability: Stocked by authorized distributors worldwide; Konmask.com maintains verified surplus inventory
Typical Applications
- Discrete sensor signal aggregation (proximity, limit switches, photoelectric sensors)
- Machine safety interlocks and status monitoring
- Conveyor and material handling control systems
- Automotive assembly line automation
- Oil & gas wellhead and pipeline monitoring
- Water/wastewater treatment plant SCADA integration
- Pharmaceutical batch process control
System Compatibility
- Compatible Chassis: 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17 (all ControlLogix chassis)
- Compatible Controllers: 1756-L6x, 1756-L7x, 1756-L8x series ControlLogix CPUs
- Software: RSLogix 5000 v13+, Studio 5000 Logix Designer v21+
- Communication: Via ControlBus backplane; compatible with EtherNet/IP, ControlNet, and DeviceNet bridge configurations
- Not Compatible With: SLC 500, MicroLogix, or CompactLogix chassis (different backplane architecture)
Selection Guide
Use the following criteria to confirm the 1756-IB32 is the right module for your application:
- Point Count: Requires exactly 32 discrete inputs in a single slot → 1756-IB32 ✓
- Voltage Level: Field devices operate at 12V or 24V DC → 1756-IB32 ✓
- Platform: System uses ControlLogix chassis → 1756-IB32 ✓
- Diagnostics Required: If per-channel fault detection is needed → consider 1756-IB16D instead
- Budget Constraint: If cost is primary driver and 16 points suffice → consider 1756-IB16
- Hazardous Location: If ATEX/IECEx rating is required → consult Rockwell for certified variants
Quality Assurance & Sourcing
- Source: Konmask.com sources 1756-IB32 modules from verified surplus, authorized distributors, and OEM-returned stock
- Inspection: Each unit undergoes visual inspection, label verification, and functional bench testing prior to shipment
- Warranty: 90-day replacement warranty on all stocked modules
- Traceability: Lot documentation and country-of-origin records available upon request
- Anti-Counterfeit: We do not source from unverified grey-market channels; all modules include original Rockwell labeling
How to Order
- Part Number: 1756-IB32
- Add to Cart directly on this page, or contact us for bulk/project pricing
- Lead Time: In-stock units ship within 1–3 business days; ex-stock orders confirmed within 24 hours
- Payment: T/T (wire transfer), PayPal, and major credit cards accepted
- Export: International shipping available; export documentation (CO, packing list, commercial invoice) provided
- RFQ: Email support@konmask.com with quantity, required delivery date, and destination
Replacement & Compatibility FAQ
Q: Can I replace a 1756-IB32 Series A with a Series B?
A: Yes. Series B is a direct drop-in replacement with no configuration changes required in Studio 5000.
Q: Is the 1756-IB32 compatible with a 1756-L84E controller?
A: Yes, all 1756-L8x series controllers are fully compatible with the 1756-IB32 in any ControlLogix chassis slot.
Q: Can I use a 1769-IQ32 as a replacement?
A: No. The 1769-IQ32 is a CompactLogix module and uses a different backplane. It is not physically or electrically interchangeable with the 1756-IB32.
Q: What wiring connector does the 1756-IB32 use?
A: The 1756-IB32 uses a 40-pin RTB (Removable Terminal Block), catalog number 1756-TBNH or 1756-TBNF (not included).
Q: Do you provide a test report or functional verification?
A: Yes. Functional test reports are available upon request for orders of 3+ units.
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