Allen-Bradley 1746-NR8 Analog Input Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1746-NR8 is an 8-channel analog input module designed for the SLC 500 programmable controller platform. It accepts RTD and thermocouple inputs, making it a critical component in temperature-sensing and process-control applications across manufacturing, HVAC, and industrial automation environments. This page provides full technical specifications, compatible replacement options, and a structured selection guide to help engineers and procurement teams make confident sourcing decisions.
Technical Specifications
- Part Number: 1746-NR8
- Manufacturer: Allen-Bradley (Rockwell Automation)
- Platform: SLC 500
- Input Channels: 8 (individually configurable)
- Input Types: RTD (Pt100, Pt1000, Ni120) and Thermocouple (J, K, E, T, R, S, B types)
- Resolution: 16-bit
- Backplane Current Draw: 150 mA @ 5 VDC; 0 mA @ 24 VDC
- Operating Temperature: 0 °C to 60 °C (32 °F to 140 °F)
- Storage Temperature: -40 °C to 85 °C
- Relative Humidity: 5% to 95% (non-condensing)
- Dimensions (H × W × D): 111.8 mm × 40.6 mm × 87.4 mm
- Weight: Approx. 200 g
- Certifications: UL, CE, CSA
- Catalog Series: SLC 500 I/O family
Compatible Replacement & Equivalent Models
When the original 1746-NR8 is unavailable, end-of-life, or cost-prohibitive, the following alternatives are commonly evaluated. Always verify firmware compatibility and I/O addressing before substitution.
- 1746-NR4 — 4-channel RTD/thermocouple input; half the channel count, same SLC 500 backplane. Suitable when fewer inputs are required.
- 1746-NT4 — 4-channel thermocouple-only input module; lower cost if RTD inputs are not needed.
- 1746-NT8 — 8-channel thermocouple input; direct channel-count equivalent when RTD capability is not required.
- 1746-NI8 — 8-channel analog voltage/current input; suitable for 4–20 mA or 0–10 V sensors as a functional alternative in non-temperature applications.
- PROSOFT MVI46 series — Protocol gateway modules that can bridge legacy SLC 500 racks to modern sensor networks when full platform migration is planned.
- Third-party equivalents — Modules from Spectrum Controls (1746-NR8S) and other SLC 500-compatible vendors may offer drop-in compatibility; confirm with the supplier’s compatibility matrix.
Note: Konmask.com supplies both genuine Allen-Bradley modules and verified compatible alternatives. Contact us for availability and lead time.
Why Choose the Original Model
- Guaranteed firmware compatibility with all SLC 500 processor families (5/01 through 5/05).
- Native RSLogix 500 integration — no additional configuration files or EDS imports required.
- Proven field reliability in continuous-process environments with 16-bit resolution and hardware-level open-circuit detection.
- Full Rockwell Automation technical support and documented revision history.
- Regulatory compliance — UL, CE, and CSA listings maintained across all production revisions.
Typical Applications
- Temperature monitoring in furnace, oven, and kiln control systems
- HVAC process control with RTD-based zone sensing
- Pharmaceutical and food-grade batch processing (temperature validation)
- Boiler and steam system monitoring
- Plastics extrusion and injection molding temperature loops
- Water treatment plant instrumentation
- Oil & gas upstream and midstream process monitoring
System Compatibility
- Backplane: SLC 500 fixed and modular chassis (1746-A4, 1746-A7, 1746-A10, 1746-A13)
- Processors: SLC 5/01, 5/02, 5/03, 5/04, 5/05
- Programming Software: RSLogix 500 (all versions); ACD import supported via RSLogix 5000 legacy conversion
- Communication: Backplane data table access via I/O image; no dedicated network port
- Power Supply: 1746-P series power supplies (1746-P1, P2, P3, P4, P7)
- Not compatible with: ControlLogix (1756), CompactLogix (1769), or MicroLogix platforms without an adapter module
Selection Guide
Use the decision matrix below to identify the right module for your application:
- Need 8 channels + RTD + thermocouple? → 1746-NR8 (this module) ✓
- Need 8 channels + thermocouple only? → Consider 1746-NT8
- Need 4 channels + RTD + thermocouple? → Consider 1746-NR4
- Need 8 channels + 4–20 mA / 0–10 V? → Consider 1746-NI8
- Migrating to ControlLogix? → Consider 1756-IR6I (ControlLogix RTD/thermocouple) with chassis migration
- Budget-constrained, same SLC 500 rack? → Request Konmask compatible-alternative quote
If your application requirements fall outside these categories, contact our technical team for a custom selection recommendation.
Quality Assurance & Sourcing
- All modules sourced through authorized distribution channels or verified surplus with full traceability documentation.
- Pre-shipment inspection includes visual check, label verification, and where applicable, functional power-on test.
- Counterfeit-risk mitigation: serial number verification against Rockwell Automation databases upon request.
- Packaging: original OEM packaging preferred; anti-static ESD bags used for all open-box or surplus units.
- Warranty: 90-day replacement warranty on all stocked units; extended warranty available on request.
How to Order
- Step 1: Confirm your SLC 500 chassis model and available slot count.
- Step 2: Verify processor series (5/01–5/05) for firmware compatibility.
- Step 3: Select quantity and specify new, refurbished, or compatible-alternative preference.
- Step 4: Add to cart or contact support@konmask.com for bulk pricing, lead time, and export documentation.
- Step 5: Receive order confirmation with tracking and certificate of conformance (CoC) if required.
We accept purchase orders (PO), bank transfer (T/T), and major credit cards. Export packing lists and commercial invoices provided for international shipments.
Replacement & Compatibility FAQ
Q: Can the 1746-NR8 be used in a ControlLogix chassis?
A: No. The 1746-NR8 is designed exclusively for the SLC 500 backplane. For ControlLogix, use the 1756-IR6I or equivalent 1756-series analog input module.
Q: Is the 1746-NR8 still in production?
A: Rockwell Automation has moved this product to a limited-availability or end-of-life status in some regions. Konmask.com maintains stock of new and surplus units — contact us for current availability.
Q: Can I mix RTD and thermocouple inputs on the same module?
A: Yes. Each of the 8 channels is individually configurable for RTD or thermocouple input type via RSLogix 500 software.
Q: What is the difference between 1746-NR8 and 1746-NR4?
A: The primary difference is channel count — 8 vs. 4. Both support the same input types and share the same SLC 500 backplane interface.
Q: Do you provide a certificate of conformance (CoC)?
A: Yes, CoC documentation is available upon request for all orders. Please specify at time of order.
Q: What is the lead time for the 1746-NR8?
A: In-stock units ship within 1–3 business days. For out-of-stock situations, typical lead time is 2–6 weeks depending on sourcing channel. Contact us for real-time availability.
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