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Home > Electrical & Electronics > Electrical Control System > NI SCXI-1324 Terminal Block

NI SCXI-1324 Terminal Block

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

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Other, Global universal model

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Guizhou Yuanmiao Automation Equipment Co., Ltd.

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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

NI SCXI-1324

The NI SCXI-1324 is a high-performance signal conditioning module for industrial automation and control systems, primarily used with the SCXI-1160 relay module to enable high-voltage general-purpose switching applications.

Functional Features

High-Voltage Signal Processing
Suitable for high-voltage general-purpose switching applications, it handles high-voltage signals to meet special control requirements for high-voltage signals in industrial environments.
Shielded Terminal Design
As a shielded terminal block, it enables fast and convenient signal connection while reducing external interference, ensuring stable and accurate signal transmission.
Multi-Terminal Connectivity
Equipped with 48 screw terminals, it connects to the 16 relays inside the SCXI-1160 relay module, providing rich connection options for constructing complex signal control circuits.

Technical Specifications

Channel Characteristics

Common-mode isolation between channels and to ground: 250V rms.
Maximum load or signal current per channel: 2A, capable of withstanding certain voltage and current to adapt to various signal types and intensities.

Operating Environment

Operating temperature: 0°C to 50°C.
Storage temperature: -20°C to 70°C.
Non-condensing relative humidity: 5% to 90%, suitable for wide temperature and humidity ranges to ensure stable operation in different industrial environments.

Wiring Specifications
Maximum field wire gauge: 26-16AWG, defining the range of connectable wire gauges to help users select appropriate cables for signal connection.

Typical Application Scenarios

Industrial Automation Control
Used on production lines to control switches of high-voltage equipment such as large motors and heaters, enabling precise control and monitoring of automated production processes.
Power System Monitoring and Control
Applied in power facilities like substations and switchgear to monitor and control the operation status of high-voltage power equipment, such as on-off control of high-voltage switches and acquisition/transmission of power signals, ensuring stable power system operation.
High-Voltage Testing Equipment
Connects testing instruments and DUTs (devices under test) during high-voltage electrical equipment testing, enabling high-voltage signal switching and transmission to ensure safe and accurate testing.

Working Principle of NI SCXI-1324I. Fundamental Principle of Thermocouple Measurement

Thermocouples operate based on the Seebeck effect—when two different metal conductors form a closed loop, a thermoelectric potential (mV-level signal) proportional to the temperature difference is generated if the two ends (hot and cold junctions) are at different temperatures.
The core function of SCXI-1324 is to process this weak signal to ensure measurement accuracy, and its working principle can be broken down into the following key aspects:

II. Cold Junction Compensation Principle

Cold Junction Temperature Measurement
The thermoelectric potential output by a thermocouple only reflects the temperature difference between the hot and cold junctions. If the cold junction temperature (i.e., the ambient temperature where the terminal block is located) fluctuates, it will cause measurement errors.
SCXI-1324 integrates a high-precision thermistor sensor to monitor the cold junction temperature in real time (typically installed on an isothermal copper plane). Its resistance changes linearly with temperature and is converted into a voltage signal via a circuit (e.g., 1.91-0.58V output at 0-55°C).
Compensation Signal Generation
Based on real-time data from the cold junction temperature sensor, the terminal block generates a compensation voltage corresponding to the cold junction temperature through internal circuits. This voltage is superimposed on the thermoelectric potential output by the thermocouple, enabling the measurement system to obtain an equivalent thermoelectric potential with 0°C as the cold junction reference, thus eliminating the impact of cold junction temperature fluctuations.

III. Signal Conditioning and Electrical Connection Design

Isothermal Structure Design
An isothermal copper plane integrates all thermocouple connection terminals on the same heat-conducting plane, reducing temperature gradients between terminals (uniform heat conduction), avoiding measurement errors caused by local temperature differences, and ensuring consistency of cold junction temperatures across channels.
Differential Input and Noise Suppression
All 32 channels are differential inputs. The positive (CH+) and negative (CH-) terminals of each channel connect to the two poles of the thermocouple, effectively suppressing common-mode noise (e.g., electromagnetic interference, ground loop noise).
Thermocouple cables are connected via screw terminals, and the cable shield can be connected to the chassis ground terminal to further reduce external interference.
Open Circuit Detection Mechanism
Each channel is equipped with a pull-up resistor (CH+ to +5V) and a bias resistor (CH- to chassis ground). When the thermocouple is open, the differential input signal saturates (exceeds the normal range), and the SCXI module can determine whether the thermocouple is disconnected by detecting this anomaly, enabling fault early warning.

IV. Collaborative Workflow with SCXI Modules

Signal Transmission
The mV-level signal output by the thermocouple is connected via the SCXI-1324 terminal block, differentially amplified, and transmitted to the supporting SCXI analog input module (e.g., SCXI-1125).
Analog-to-Digital Conversion and Processing
The SCXI module filters, amplifies the signal, converts it to a digital quantity via an ADC, and calculates the actual temperature value in combination with cold junction compensation data (requiring the invocation of temperature calculation algorithms in NI software such as LabVIEW).
System Integration
The terminal block connects to the chassis via the SCXI bus, supporting power supply, data communication, and inter-module synchronization to form a complete temperature measurement system.

V. Summary of Key Technical Points

Functional Module	Core Working Principle	Objective
Cold Junction Compensation	Thermistor monitors cold junction temperature in real time, generates compensation voltage to superimpose on thermocouple signals.	Eliminate the impact of cold junction temperature fluctuations on measurement.
Isothermal Copper Plane Design	Utilize copper's high thermal conductivity to keep all terminals in the same temperature field, reducing thermal gradients.	Ensure consistency of cold junction temperatures across channels.
Differential Input and Noise Suppression	Differential circuits extract signal differences, and shielded grounding design suppresses common-mode interference.	Improve signal-to-noise ratio and measurement accuracy.
Open Circuit Detection	Detect channel signal saturation via pull-up/bias resistors to determine if the thermocouple is disconnected.	Achieve fault diagnosis and ensure system reliability.