NI SCXI-1327

Description

Detailed parameter table

NI SCXI-1327

Product introduction

The National Instruments SCXI-1327 is a rugged terminal block designed to simplify wiring and protect 16-channel SCXI analog input modules, including the NI SCXI-1141, NI SCXI-1121, and NI SCXI-1122. As an essential accessory in NI’s SCXI ecosystem, it serves as the critical interface between field sensors/transducers and SCXI modules, converting the module’s high-density VHDCI connector into accessible screw terminals for easy installation and maintenance.

Engineered for durability and functionality, the NI SCXI-1327 provides a secure termination point for analog signals, supporting wire gauges from 28 AWG (fine sensor leads) to 14 AWG (heavy-duty industrial wiring). When paired with the NI SCXI-1141 isolated module, the NI SCXI-1327 maintains the module’s 2,500 Vrms isolation rating, ensuring safety in high-voltage environments. Its compact design (6.5 in × 3.2 in × 2.8 in) fits easily in control cabinets, while DIN rail or panel mounting options adapt to diverse installation scenarios—from lab benches to factory floors. By organizing wiring and protecting module connectors from wear, the NI SCXI-1327 extends the lifespan of SCXI systems and reduces downtime from wiring errors.

Core advantages and technical highlights

Simplified Wiring for 16-Channel Modules:
The NI SCXI-1327 transforms the dense 68-pin VHDCI connector of SCXI analog modules into 37 clearly labeled screw terminals, making it easy to connect sensors, transducers, and signal wires. Each terminal is marked with corresponding channel numbers and signal types (e.g., “CH 0+,” “CH 0-,” “AGND”), eliminating confusion during installation. Unlike direct module wiring (which requires specialized crimp tools for VHDCI connectors), the NI SCXI-1327 accepts standard screwdrivers, allowing technicians to make or modify connections in minutes. For example, in a factory setup using the NI SCXI-1141 to monitor 16 pressure sensors, the NI SCXI-1327 lets technicians quickly swap a faulty sensor without disrupting the entire module.

Broad Wire Compatibility and Secure Connections:
With support for 28-14 AWG wires—including both solid and stranded types—the NI SCXI-1327 adapts to diverse signal sources: from fine-gauge thermocouple wires (28 AWG) to heavy-duty industrial cables (14 AWG). The screw terminals feature captive screws (preventing loss) and a clamping design that ensures gas-tight connections, minimizing resistance and signal loss. For stranded wires, the terminals work with or without ferrules, providing flexibility in field wiring. This versatility makes the NI SCXI-1327 ideal for mixed environments, such as a test lab using 24 AWG strain gage wires with a NI SCXI-1122 module alongside a factory floor using 16 AWG sensor cables with a NI SCXI-1141.

Protection for Modules and Signals:
The NI SCXI-1327 shields SCXI modules from physical damage and environmental stress. Its rugged plastic housing (UL 94 V-0 flame rating) protects the module’s VHDCI connector from dust, moisture, and accidental impacts—common causes of connector wear in industrial settings. By serving as an intermediary, the NI SCXI-1327 also prevents repeated plugging/unplugging from damaging the module’s connector pins, extending module lifespan. Additionally, the terminal block provides strain relief for connected wires, reducing tension on solder joints inside the module. When paired with the NI SCXI-1141, it maintains the module’s 2,500 Vrms isolation, ensuring safety in high-voltage applications like power distribution monitoring.

Flexible Mounting for Diverse Environments:
The NI SCXI-1327 supports both DIN rail (35 mm) and panel mounting, adapting to the installation requirements of lab, industrial, and mobile systems. DIN rail mounting allows quick integration into standard control cabinets—common in factory automation—while panel mounting suits custom enclosures or benchtop setups. The terminal block’s compact size (6.5 in × 3.2 in × 2.8 in) ensures it fits in space-constrained environments, such as mobile test carts or offshore oil rig control boxes. This flexibility makes the NI SCXI-1327 a universal solution for mounting NI SCXI-1141 and other modules in nearly any scenario.

Typical application scenarios

In industrial automation, the NI SCXI-1327 simplifies wiring for a NI SCXI-1141 module monitoring 16 hydraulic pressure sensors in a manufacturing press. Mounted on a DIN rail in the press’s control cabinet, the NI SCXI-1327 connects 18 AWG shielded cables from the sensors to the NI SCXI-1141. Its labeled terminals allow maintenance technicians to quickly identify which sensor corresponds to “CH 7” in the system software, reducing troubleshooting time when a pressure reading is abnormal. The terminal block’s strain relief prevents cable damage from vibration in the press, ensuring reliable connections during 24/7 operation.

In a structural testing lab, the NI SCXI-1327 pairs with a NI SCXI-1122 module to terminate 24 AWG strain gage wires from a bridge structure. Panel-mounted to the lab’s test rack, the terminal block organizes 16 differential strain signals, with clear labels matching the gages’ physical locations on the bridge. Researchers can easily reconfigure wiring via the NI SCXI-1327’s screw terminals when adjusting the test setup—adding or removing gages without specialized tools. The terminal block’s compact size keeps the test rack organized, even with multiple SCXI modules and cables.

In energy distribution, the NI SCXI-1327 enables safe wiring for a NI SCXI-1141 module measuring 16 current transformer outputs in a substation. Mounted in an IP65-rated enclosure, the terminal block accepts 16 AWG wires from the transformers, with its isolation-compatible design maintaining the NI SCXI-1141’s 2,500 Vrms protection. Technicians use the NI SCXI-1327’s labeled terminals to verify correct phase wiring (e.g., “CH 0+ = Phase A,” “CH 1+ = Phase B”), critical for accurate power quality analysis. The terminal block’s rugged housing withstands dust and temperature fluctuations in the substation, ensuring long-term reliability.

NI SCXI-1327

Related model recommendations

NI SCXI-1322: A terminal block for 8-channel SCXI modules (e.g., NI SCXI-1102B thermocouple module), serving as a smaller counterpart to the NI SCXI-1327. It shares the same screw terminal design but supports fewer channels, ideal for systems using 8-channel modules instead of 16-channel models like the NI SCXI-1141.

NI SCXI-1349: A DAQ interface module that works with the NI SCXI-1327 and NI SCXI-1141 to connect to DAQ devices (e.g., NI PCI-6221). While the NI SCXI-1327 handles sensor wiring, the NI SCXI-1349 routes conditioned signals from the NI SCXI-1141 to the DAQ device.

NI SCXI-1000: The 4-slot SCXI chassis that houses the NI SCXI-1141 and pairs with the NI SCXI-1327. The terminal block mounts near the chassis, creating a compact, organized system for 16-channel measurements.

NI SCXI-1141: The 16-channel isolated analog input module that the NI SCXI-1327 is specifically designed to support. The terminal block provides secure, labeled wiring for the module’s analog inputs, enhancing its usability in industrial settings.

NI SCXI-1121: A non-isolated 16-channel analog input module compatible with the NI SCXI-1327. The terminal block simplifies wiring for this module in low-noise environments, such as lab testing, where isolation isn’t required.

NI 1978: A shielded cable set (2 m) designed to connect the NI SCXI-1327 to sensors. It includes 16 twisted-pair cables with color coding matching the terminal block’s labels, reducing wiring errors.

NI SCXI-1303: A terminal block for SCXI digital modules (e.g., NI SCXI-1200), complementing the NI SCXI-1327 in mixed-signal systems. While the NI SCXI-1327 handles analog signals, the NI SCXI-1303 manages digital I/O wiring.

NI 9945: A DIN rail mounting kit for securing the NI SCXI-1327 in industrial cabinets. It includes brackets and hardware for sturdy installation, ensuring the terminal block remains stable in vibrating environments.

Installation, commissioning and maintenance instructions

Installation preparation

Before installing the NI SCXI-1327, verify compatibility with the target SCXI module (e.g., NI SCXI-1141) and gather required tools: a Phillips-head screwdriver (for terminal screws), wire strippers (adjusted for 28-14 AWG), and ferrules (optional, for stranded wire). Ensure the mounting location (DIN rail or panel) is clean, dry, and within the 0 °C to 55 °C operating range. For industrial environments, mount the NI SCXI-1327 at least 2 in away from heat sources (e.g., motors) to avoid temperature-related issues. When connecting to a NI SCXI-1141, use the module’s alignment pins to mate the terminal block’s VHDCI connector—apply even pressure to avoid bending pins. Secure the terminal block to the mounting surface before wiring to prevent movement during connection.

Maintenance suggestions

For daily maintenance of the NI SCXI-1327, inspect terminal screws monthly to ensure they’re tight—loose connections cause signal noise or intermittent readings. Use a torque screwdriver set to 0.5 N·m (4.4 in·lb) to avoid over-tightening, which can damage terminals. Clean the terminal block’s housing and terminals with a dry, lint-free cloth; avoid liquids or abrasive cleaners that may degrade the plastic or insulation. Check for wire fraying at the terminal entries—trim and re-strip wires if needed, or use ferrules to prevent strand breakage. When replacing the NI SCXI-1327 (e.g., due to terminal damage), label wires before disconnecting to simplify reconnection to the new terminal block. Store spare NI SCXI-1327 units in a dry, temperature-controlled environment (-40 °C to 85 °C) to prevent moisture damage.

Service and guarantee commitment

National Instruments (NI) backs the NI SCXI-1327 with a 1-year standard warranty, covering defects in materials and workmanship—including terminal integrity and connector durability. If the NI SCXI-1327 fails during the warranty period (e.g., due to broken terminals or connector damage), NI provides free replacement to minimize system downtime. NI’s global technical support team is available 24/7 via email, phone, and chat, offering guidance on proper installation (e.g., torque specifications, wire preparation) and compatibility with SCXI modules like the NI SCXI-1141. Additionally, NI provides detailed wiring diagrams and user manuals for the NI SCXI-1327, ensuring users can maximize its functionality in their specific setup. This commitment reflects NI’s confidence in the NI SCXI-1327’s quality and its role as a critical accessory for reliable SCXI system operation.