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Home > Electrical & Electronics > Electrical Control System > Allen-Bradley 1746-NT8 Thermocouple/mV Analog Input Module

Allen-Bradley 1746-NT8 Thermocouple/mV Analog Input Module

Guizhou Yuanmiao Automation Equipment Co., Ltd.

1Yr

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Negotiable MOQ: 1 Unit (Price negotiable depending on order volume and customization)

Key Specifications

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Material:

Other, Global universal model

Condition:

Other, Global universal model

Task:

Other, Global universal model

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Port of Shipment:

China

Delivery Detail:

Delivery time depends on order quantity.

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Material Other, Global universal model

Condition Other, Global universal model

Task Other, Global universal model

Mathematical Model Other, Global universal model

Signal Other, Global universal model

Customized Non-Customized

Structure Other, Global universal model

Operating temperature 0°C - 60°C

Humidity 5% - 95% (non - condensing)

Output voltage 24V DC

Dimensions 160mm×100mm×150mm

I. Product Overview

1746-NT8 is an 8-channel thermocouple input module in Rockwell Automation's SLC 500 series, specially designed for accurate temperature measurement in high-temperature environments within the industrial automation field. It can directly connect to various types of thermocouple sensors, converting the weak thermoelectric potential signals output by thermocouples into digital signals recognizable by PLC. It is widely used in industries that require high-temperature environment monitoring, such as metallurgy, heat treatment, glass manufacturing, and ceramic firing. By real-time collecting temperatures in key process links, it provides reliable data for the system's temperature control, quality traceability, and safety early warning, and is a core component ensuring the stable operation of high-temperature production processes.

II. Functional Features

Compatibility with multiple types of thermocouples: It supports various commonly used thermocouple types such as J, K, T, E, R, S, and B, and can adapt to scenarios with different temperature measurement ranges and accuracy requirements. For example, K-type thermocouples are commonly used in the metallurgical industry to measure furnace temperatures (-200℃-1372℃), and T-type thermocouples can be used in food processing to monitor refrigerated environments (-200℃-400℃), which greatly expands the application range of the module.

8-channel independent acquisition: Equipped with 8 independent input channels, it can monitor 8 temperature points at different locations simultaneously, meeting the need for synchronous temperature monitoring in multiple regions, such as different heating zones of large heat treatment furnaces and multiple temperature measurement points of glass kilns. It eliminates the need for splicing multiple single-channel modules, simplifying the system structure.

High-precision temperature measurement: Adopting high-precision signal conditioning circuits and 16-bit A/D conversion technology, combined with cold junction compensation function, it can effectively reduce measurement errors and ensure temperature measurement accuracy. Usually, within the effective temperature measurement range, the error can be controlled within ±0.1% of the full scale, meeting the strict requirements of high-precision processes for temperature monitoring.

Cold junction compensation function: Built-in cold junction compensation circuit, which can automatically compensate for measurement errors caused by temperature changes at the cold junction of the thermocouple. In traditional thermocouple measurement, fluctuations in cold junction temperature will lead to measurement deviations. This module ensures measurement accuracy when the ambient temperature changes by real-time monitoring the cold junction temperature and performing calculation corrections.

Strong anti-interference ability: There is a lot of electromagnetic interference in industrial sites. The module can effectively suppress common-mode interference and series-mode interference through differential input design, filtering circuits, and electrical isolation measures, ensuring stable temperature signal acquisition in complex electromagnetic environments (such as near high-power equipment and around high-frequency heating equipment).

Open circuit detection and fault diagnosis: It has the function of thermocouple open circuit detection. When the thermocouple is broken or has poor contact, the module can quickly identify it and feed back to the PLC through status indicators or communication signals, facilitating operators to troubleshoot in time and avoiding production accidents caused by the failure of temperature monitoring.

Convenient system integration: As a standard module of the SLC 500 series, it has excellent compatibility with the series' racks, power supplies, and CPU modules. It can be directly installed on a standard rack, realizing high-speed data interaction with the system through the backplane bus, and supporting programming software such as RSLogix 500 for configuration and programming, simplifying the system construction process.

III. Technical Parameters

Input parameters:
Number of channels: 8 differential input channels.
Supported thermocouple types: J, K, T, E, R, S, B, etc.
Temperature measurement range: Varies with thermocouple types, for example, K-type is -200℃-1372℃, J-type is -210℃-1200℃.
Resolution: 16-bit A/D conversion, temperature resolution up to 0.1℃ (within the typical measurement range).
Input impedance: ≥10MΩ, reducing the load impact on thermocouple signals.

Accuracy parameters:
Measurement accuracy: ±0.1% of full scale (typical value, including cold junction compensation error).
Cold junction compensation accuracy: ±1℃ (when the ambient temperature is 0℃-60℃).

Electrical parameters:
Backplane current: Approximately 120mA at 5V DC, approximately 30mA at 24V DC.
Isolation voltage: Isolation between channels and between channels and the backplane, with an isolation voltage of 250V AC.

Physical parameters:
Dimensions: Approximately 160mm in length, 100mm in width, 150mm in height (compatible with other modules in the SLC 500 series).
Weight: Approximately 0.6kg.

Environmental parameters:
Operating temperature: 0℃-60℃.
Storage temperature: -40℃-85℃.
Relative humidity: 5%-95% (non-condensing).
Anti-vibration performance: 10-55Hz, amplitude 0.38mm.
Impact resistance: Peak acceleration 15g (duration 11ms).

IV. Working Principle

Signal acquisition: The thermocouple sensor converts the temperature signal into a weak thermoelectric potential signal (usually at the millivolt level) and transmits it to the corresponding channel of 1746-NT8 through wires. Each channel of the module receives the signal in a differential input mode, effectively suppressing common-mode interference.

Cold junction compensation: The module's built-in temperature sensor real-time monitors the ambient temperature of the cold junction (the connection end of the thermocouple and the module). According to the characteristic curve of the thermocouple, the internal circuit calculates the thermoelectric potential compensation value corresponding to the cold junction temperature, corrects the thermoelectric potential output by the thermocouple, and eliminates the measurement error caused by the change of the cold junction temperature.

Signal conditioning and amplification: The millivolt-level signal output by the thermocouple is filtered and amplified by the internal signal conditioning circuit of the module to remove noise interference and amplify the signal to a level range suitable for A/D conversion.

A/D conversion: The conditioned analog signal enters the 16-bit A/D conversion circuit and is converted into a digital signal. This digital signal has a corresponding relationship with the temperature value. The module converts the digital signal into the corresponding temperature value according to the preset thermocouple type parameters.

Data transmission: The converted temperature data is transmitted to the CPU module of the PLC through the backplane bus of the SLC 500 series. The CPU module can further process the temperature data, such as comparing with the set value, participating in control logic operations, and storing historical data.

Status monitoring and feedback: The module real-time monitors the working status of each channel. When a thermocouple open circuit, over-range, or module failure is detected, the status indicator of the corresponding channel will light up, and the fault information will be sent to the CPU through the communication bus. The CPU can trigger protection measures such as alarms or shutdowns. For example, during heat treatment, if a channel detects that the temperature exceeds the safe range, the module will feed back in time, and the CPU can control the heating device to stop working to avoid workpiece damage or safety accidents.

Product Tags: 1746-NT8 , 1746-NT4