Allen Bradley SLC 500 8-Channel Temperature Card 1746-NR8

Availability: 20 left in stock

Product Overview The Allen Bradley 1746-NR8 operates as a high-density, 8-channel RTD and resistance analog input module designed explicitly for...

SKU: 1746-NR8

Manufacturer: Allen Bradley
Product No.: 1746-NR8
Product Type: Analog Input Modules
Product Origin: USA
Payment:T/T, Western Union
Weight: 480g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Product Overview

The Allen Bradley 1746-NR8 operates as a high-density, 8-channel RTD and resistance analog input module designed explicitly for the legacy SLC 500 programmable logic controller platform. This open-style chassis card translates low-voltage resistance variations from field temperature sensors into precise digital values for the central SLC processor. Although the original manufacturer designated this model as a legacy item, we supply this product exclusively as a 100% brand new, original unit in its authentic factory box to guarantee immediate replacement compatibility and long-term asset lifecycle expansion.

Technical Specifications

Parameter	Specification Details
Manufacturer	Allen Bradley (Rockwell Automation)
Model Number	1746-NR8
Core Platform Series	SLC 500 Systems
Input Channel Density	8 Isolated Channels
Supported Signal Types	Pt100, Ni100, Cu100 RTDs, and Pure Resistance Inputs
Selectable Input Ranges	0 to 500 Ohms, 0 to 1000 Ohms, 0 to 3000 Ohms
Measurement Resolution	0.05 Ohms (500 Ohm range), 0.1 Ohms (1000 Ohm range), 0.3 Ohms (3000 Ohm range)
Module Base Accuracy	Plus or minus 0.3 Percent of Full Scale
Channel Conversion Speed	Approx. 100 ms per channel
Continuous Isolation Rating	50 V continuous (Channel-to-backplane circuit)
Backplane Current Draw (5 VDC)	150 mA
Physical Wiring Interface	Removable 1746-HT Terminal Block
Operating Temperature Limits	0 to 60 Degrees Celsius
Storage Temperature Limits	-40 to 85 Degrees Celsius
Permissible Humidity Range	Up to 95 Percent Non-Condensing Relative Humidity
Net Weight	0.48 kg (0.75 lbs)
Hardware Package Footprint	127 x 51 x 152 mm

Engineering Advantages

Food processing facilities, chemical plants, and heavy thermal energy networks require exceptionally stable temperature monitoring to maintain process safety and batch consistency. The 1746-NR8 addresses these processing demands by providing 8 high-accuracy input channels within a single slot footprint, allowing engineers to maximize slot utilization inside standard SLC 500 chassis. The module supports multiple selectable resistance ranges (0 to 500, 1000, and 3000 Ohms) to match Pt100, Ni100, and Cu100 RTD physical characteristics without needing external signal conditioning transducers.

The hardware utilizes an advanced channel filtering design that rejects common high-frequency electromagnetic interference (EMI) originating from large induction motors and nearby variable frequency drives (VFDs). A robust continuous isolation barrier rated for 50 V defends the internal backplane bus against stray field ground loops, preventing field electrical noise from corrupting data on the primary processor.

To accelerate field installation and maintenance cycles, the module features a removable 1746-HT wiring terminal block. Field technicians can swap a compromised input card out of the rack without loosening individual sensor signal wires, entirely eliminating rewiring errors and cutting downtime.

FAQs

Can technicians mix different types of RTD sensors across the 8 channels of a single 1746-NR8 module?

Yes. The software configuration tools within RSLogix 500 allow independent channel definition. Maintenance teams can configure Channel 0 for a Pt100 sensor while assigning Channel 1 to a direct Ohm resistance sensor or a different RTD element type, maximizing local flexibility.
What specific diagnostic steps help isolate a sensor wiring issue from an internal card hardware fault?

The 1746-NR8 communicates granular diagnostic bits directly to the SLC 500 controller data table. An open-circuit or short-circuit condition on the field wiring triggers a specific under-range or over-range bit for that exact channel, enabling operators to identify broken wires on the factory floor without pulling the module from the chassis.
Does this module draw power directly from an external 24 VDC power supply terminal line?

No. The 1746-NR8 derives all required operational voltages directly from the standard SLC 500 backplane power supply bus, consuming 150 mA at 5 VDC. This self-contained layout eliminates the need to route extra external power loops to the card, reducing cabinet wiring clutter.

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