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Product Description
The Allen-Bradley 1746-NT8 is an 8-channel SLC 500 thermocouple/mV analog input module that converts analog signals to digital values for SLC 500 processors. It features a 120mA/5V DC and 70mA/24V DC backplane rating (2.28W total), Delta-Sigma conversion, selectable digital filtering, high noise rejection, automatic calibration, and input overvoltage protection. It uses a 1746-RT34 removable terminal block with two +/-1.72C accuracy cold-junction compensation sensors. The module supports selectable input types with >10 M Ohm impedance (input devices <100 Ohms recommended), open-circuit detection, and a 400ms response time. It operates from 0-60C (5-95% humidity, non-condensing) and is UL/CUL approved. Status is indicated by 9 green LEDs. Compatible with SLC 5/01, 5/02, 5/03, 5/04, and 5/05 processors in fixed (1746-A2 chassis) or modular configurations (any slot except 0), it uses Sigma-Delta modulation to convert signals and store data in a CPU-accessible data table. Data formats include engineering units, scaled for PID, and proportional counts. It detects open circuits, under-range, over-range, and channel errors, providing status bits for monitoring systems like HMIs and SCADA.
Is Your Device Showing These Signs?
The Allen Bradley 1746-NT8 I/O module commonly experiences issues such as communication failures stemming from corrupted backplane connectivity or faulty network configuration. Resolve these by verifying the DH+ network settings, checking the integrity of the ribbon cable connecting the module to the chassis, and confirming proper termination resistance. Address module faults indicated by diagnostic LEDs through firmware upgrades or replacement of the unit. Power supply fluctuations and grounding problems can also cause intermittent operation; ensure stable voltage and proper grounding to mitigate these issues.
Technical specifications
The Allen-Bradley 1746-NT8 is an 8-channel analog input module for SLC 500 processors, designed to convert thermocouple/mV signals into digital data. Key features include high noise rejection, automatic calibration, selectable digital filtering, overvoltage protection, and open-circuit detection. It utilizes a removable terminal block with cold-junction compensation and supports various input types. The module is compatible with a range of SLC 5/0x processors, uses Sigma-Delta conversion, and provides data in multiple formats accessible to the CPU. It also offers comprehensive error detection and status indication for monitoring purposes.
Our Repair Process for the
1746-NT8
Our repair process for the Allen Bradley 1746-NT8 I/O module begins with verification of the DH+ network settings, followed by a thorough inspection of the ribbon cable connecting the module to the chassis to confirm its integrity. Proper termination resistance is confirmed. Diagnostic LEDs are analyzed to determine module faults, which are addressed through firmware upgrades or module replacement. Power supply voltage is stabilized, and proper grounding is established to eliminate intermittent operation caused by fluctuations or grounding problems.
Your Guarantee: Warranty & Lifetime Support
Your satisfaction is our top priority, and we confidently stand behind the quality of our repairs. That's why every repair service is covered by our comprehensive 24-month warranty. Furthermore, we offer lifetime phone support – if you have questions or need assistance related to our repair down the road, we're here to help. Our service commitment is straightforward: we guarantee our work, and if you're not satisfied, we will make it right. Learn More about our Repair process.
Comprehensive Repairs You Can Depend On
We take immense pride in the quality and reliability of our work. Our process goes beyond simply fixing the immediate problem. We perform a comprehensive inspection of your main board (or other equipment) and proactively replace components known to be failure-prone or showing signs of potential future failure. Before any item is returned, it undergoes rigorous functional testing to ensure it meets performance specifications and operates flawlessly. Visit our main Repair Services page to learn more.
Save Significantly
Our primary goal is to save you hundreds, or even thousands, of dollars compared to the cost of new equipment replacement. By repairing existing components, we provide an economical solution that is also eco-friendly. At Roc Industrial, our commitment to integrity and community drives our consistent growth and ensures you receive a reliable, cost-effective solution.
Please Note: Roc Industrial operates as an independent service provider and is not an authorized distributor for the manufacturers or brands mentioned. Consequently, the original manufacturer's warranty is not applicable to items repaired or sold by us. Roc Industrial provides its own 2-year warranty on all repair services performed.
Buying Options
To receive a quote within 2 hours, please provide us with the details of your requirements. Our team will promptly review your request and send you a custom offer.
Ships from Rochester, NY