The NI 9940 is a backshell accessory designed for 36-position spring terminal connector blocks in C Series modules. It provides integrated strain relief for signal wiring and protects operators from high-voltage exposure in industrial automation environments. Constructed from industrial-grade plastic with strong insulation properties, the backshell meets electromagnetic compatibility requirements for certain modules and ensures secure, organized wire management.
Technical Specifications
• Connector Type: 36-position spring terminal connector block
• Material: Industrial-grade plastic with high-voltage insulation
• Dimensions: Approximately 1.8 in × 2.6 in × 0.76 in
• Installation Torque: 4 lb-in
• Regulatory Compliance: RoHS-compliant; RoHS Phthalates-compliant; no SVHC content (as of July 8, 2021); US ECCN EAR99
– Key Features
• Integrated strain relief for organized wire routing and mechanical stability
• High-voltage operator protection through insulated design
• Electromagnetic compatibility support for C Series modules including NI-9226
• Prevents use with incompatible D-SUB connectors through mechanical design
• Torque-controlled fastening ensures repeatable installation
– Typical Applications
• Industrial automation systems with high-voltage signal handling
• C Series modular chassis installations requiring EMC compliance
• Spring terminal–based measurement and control modules
• Environments where operator safety and wire management are critical
– Compatibility & Integration
The NI 9940 is designed for 36-position C Series modules with spring terminals. Compatible modules include the NI-9207 C Series Voltage and Current Input Module (Spring Terminal), NI-9264 with spring terminal, and NI-9375 C Series Digital Modules. The NI cRIO-9974 Terminal Block Plug functions as a recommended companion product. The backshell also supports other devices and modules featuring spring terminal connectivity.
