Allen-Bradley 1746-NT4 Thermocouple Input Module – SLC 500 Series
Imagine a continuous casting line or a glass-tempering furnace running blind — no reliable temperature signal reaching the controller. Without a precision thermocouple input module, process temperatures drift unchecked, product quality collapses, and unplanned shutdowns cascade into costly downtime. The Allen-Bradley 1746-NT4 exists precisely to prevent that scenario, delivering four channels of isolated, high-accuracy thermocouple measurement directly into the SLC 500 backplane with zero compromise on signal integrity.
Within the SLC 500 family, the 1746-NT4 occupies the role of the workhorse temperature front-end: it supports all major thermocouple types (J, K, E, T, R, S, B), provides individual channel isolation to eliminate ground-loop interference, and integrates seamlessly with RSLogix 500 ladder logic. Globally, the SLC 500 platform remains one of the most widely deployed mid-range PLC architectures in food & beverage, metals, plastics, and HVAC — making the 1746-NT4 one of the most sought-after I/O modules in the industrial aftermarket.
Technical Specifications
- Module Type: Thermocouple / mV Analog Input
- Number of Input Channels: 4 (individually isolated)
- Thermocouple Types Supported: J, K, E, T, R, S, B
- Input Range (mV): ±100 mV (direct millivolt input mode)
- Resolution: 16-bit (including sign bit)
- Accuracy: ±0.1% of full scale (typical)
- Cold Junction Compensation: Automatic, internal sensor
- Channel Isolation: 250 V AC channel-to-channel and channel-to-backplane
- Backplane Current Draw: 150 mA @ 5 V DC; 0 mA @ 24 V DC
- 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
- Backplane Compatibility: SLC 500 fixed and modular chassis (1746 series)
- Slot Width: Single-slot module
- Certifications: UL, CSA, CE
- Catalog Number: 1746-NT4
Key Features & Benefits
- 4-Channel Isolated Inputs: Each channel is independently isolated at 250 V AC, eliminating ground loops that corrupt temperature readings in electrically noisy industrial environments.
- Universal Thermocouple Support: A single module handles J, K, E, T, R, S, and B type thermocouples plus direct mV input — reducing spare-parts inventory and simplifying BOM management.
- Automatic Cold Junction Compensation (CJC): The onboard CJC sensor continuously corrects for ambient temperature variation at the terminal block, ensuring measurement accuracy without external reference junctions.
- 16-Bit Resolution: Fine-grained temperature resolution supports tight process control loops in precision applications such as pharmaceutical autoclaves and semiconductor diffusion furnaces.
- Open-Wire Detection: The module flags broken thermocouple wires per channel, enabling the PLC program to trigger alarms or safe-state logic before a process fault escalates.
- Single-Slot Form Factor: Conserves valuable chassis slots in space-constrained panels while delivering four measurement points.
- RSLogix 500 Native Integration: Full configuration and diagnostics are accessible through standard RSLogix 500 / Studio 5000 Logix Designer (via SLC emulation), with no proprietary add-on instructions required.
Industry & Equipment Applications
- Food & Beverage: Pasteurization tunnels, retort sterilizers, baking ovens, and CIP temperature monitoring
- Metals & Foundry: Continuous casting temperature control, heat-treatment furnaces, annealing lines
- Plastics & Rubber: Injection molding barrel temperature zones, extrusion die temperature profiling
- HVAC & Building Automation: Boiler stack temperature monitoring, chiller process control
- Pharmaceutical: Autoclave validation, lyophilizer shelf temperature mapping
- Glass & Ceramics: Kiln temperature profiling, tempering oven control
- Oil & Gas: Pipeline heat-trace monitoring, separator temperature control
System Integration & Compatible Parts
The 1746-NT4 installs in any SLC 500 modular chassis and is fully compatible with the following Allen-Bradley components:
- Chassis: 1746-A4, 1746-A7, 1746-A10, 1746-A13
- Power Supplies: 1746-P1, 1746-P2, 1746-P3, 1746-P4
- Processors: SLC 5/03 (1747-L532), SLC 5/04 (1747-L541/L542/L543), SLC 5/05 (1747-L551/L552/L553)
- Programming Software: RSLogix 500 v8.x and above; RSLinx Classic for communications
- Communication Modules: 1747-SDN (DeviceNet), 1747-KE (DH-485 to RS-232), 1747-AENTR (EtherNet/IP adapter)
- Related I/O: 1746-NR4 (RTD Input), 1746-NO4I (Analog Output), 1746-NI4 (Analog Input)
Our Quality Assurance Process
Every 1746-NT4 unit shipped from Konmask.com undergoes a structured inspection protocol before dispatch:
- Visual Inspection: PCB, connector pins, and housing checked for physical damage, corrosion, or counterfeit indicators
- Label & Firmware Verification: Catalog number, series letter, and firmware revision confirmed against Rockwell Automation documentation
- Functional Power-On Test: Module powered in a live SLC 500 chassis; backplane communication and channel status LEDs verified
- Traceability: Each unit is logged with inspection date, technician ID, and serial number for full after-sale traceability
- Packaging: Anti-static bag + foam-lined carton with desiccant for safe international transit
How to Order
- Step 1 — Submit an Inquiry: Use the Contact Us form or email support@konmask.com with your required quantity and delivery timeline.
- Step 2 — Receive a Quotation: Our team responds within 1 business day with pricing, lead time, and availability confirmation.
- Step 3 — Order Confirmation: Approve the proforma invoice; we accept T/T bank transfer, PayPal, and major credit cards.
- Step 4 — Shipment & Tracking: Orders are dispatched via DHL / FedEx / UPS with full tracking. Express delivery to most destinations in 3–7 business days.
Why Choose Konmask.com?
- ✅ Specialized in Industrial Automation: We focus exclusively on PLC, DCS, and automation hardware — not a general electronics marketplace.
- ✅ Global Stock Network: Access to surplus, refurbished, and new-surplus Allen-Bradley inventory across multiple warehouses.
- ✅ Technical Pre-Sales Support: Our engineers can verify compatibility with your existing SLC 500 system before you commit to an order.
- ✅ Fast Inquiry Response: Guaranteed reply within 1 business day; urgent RFQs handled same day.
- ✅ Secure Packaging & Export Documentation: Full commercial invoice, packing list, and COO certificate provided for customs clearance.
- ✅ After-Sale Support: 90-day warranty on all tested units; DOA replacement policy.
Frequently Asked Questions
Q: What thermocouple types does the 1746-NT4 support?
A: The module supports J, K, E, T, R, S, and B type thermocouples, as well as direct millivolt (±100 mV) input for custom sensors.
Q: Can the 1746-NT4 be used in a fixed SLC 500 controller?
A: No. The 1746-NT4 is designed for modular SLC 500 chassis (1746-Axx series). It is not compatible with fixed SLC 500 controllers such as the 1747-L20x or 1747-L30x.
Q: How do I configure the module in RSLogix 500?
A: Add the 1746-NT4 to the I/O configuration tree in RSLogix 500, select the module from the catalog, and configure each channel’s thermocouple type, filter frequency, and data format via the module’s configuration file (M0/M1 files).
Q: Is the unit you ship new, refurbished, or surplus?
A: We stock a mix of factory-new surplus and professionally tested/refurbished units. The condition is clearly stated in your quotation. All units pass our QA protocol before shipment.
Q: What is the lead time for the 1746-NT4?
A: In-stock units ship within 1–3 business days of order confirmation. For larger quantities, lead time is confirmed at the quotation stage.
Q: Do you provide a warranty?
A: Yes. All tested units carry a 90-day warranty against defects in materials and workmanship. DOA units are replaced at no charge.
Q: Can you supply multiple units for a plant-wide upgrade project?
A: Yes. We handle both single-unit spot buys and bulk orders. Contact us with your project BOM for a consolidated quotation.
© 2026 Konmask.com. All rights reserved.
Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
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