As technology advances, embedded software is becoming increasingly prevalent in complex, safety critical systems such as automobiles and aircraft. Hardware-in-the-loop (HIL) testing is a methodology adopted by many industries to test embedded software while simulating the real-world inputs to that system. This approach allows testers to test early and often without risking damage to costly hardware and without incurring safety risks associated with unvetted product.
Because successful HIL testing hinges on accurately simulating real-world signals, custom signal conditioning and in-house development of simulated loads to guarantee signal integrity has been the norm. While it’s true that no one is as knowledgeable about specific test requirements as the test engineer working on the system, NI has observed that much of this custom engineering is common across companies and industries. This observation lead to the development of SLSC, an add-on to NI’s powerful measurement and control platform that streamlines signal conditioning and test stimulus needs.
SLSC Extends the Functionality of Measurement and Control Hardware Such as PXI
SLSC extends PXI and CompactRIO and consists of a chassis with modules. Each module has a Rear Transition Interface (RTI) which provides flexible standardized connectivity from SLSC to PXI or CompactRIO. Additionally, an SLSC system has a standard pinout that allows for the use of standard cables and eliminates point to point wiring.
SLSC plug-in modules can operate in the chassis in three different modes: stand alone, pass through, or cascaded. Cascaded mode can be used to cascade the signal path through multiple SLSC modules and implement functionality like signal fault insertion. You can choose from a variety of third-party modules or create your own modules based on a detailed hardware and software module development kit (MDK) from NI.
SLSC hardware is designed to simplify overall system integration by reducing system point-to-point wiring through signal accumulation and standard cable use. Each SLSC chassis consists of an SLSC digital bus, which you can use to discover, configure, and set parameters on the individual modules. Signals pass through SLSC modules either from the front connector or the rear transition interface (RTI) connector. You have the flexibility to design your own secondary backplane RTIs to reduce system wiring.
SLSC sits between the DUT/UUT and the data acquisition device you’re using
An SLSC system is comprised of four different component types: chassis, modules, rear transition interfaces (RTIs), and cables. The chassis and architecture have been designed and are produced by National Instruments with both NI and partners producing components that complete the ecosystem.
An example system diagram of SLSC components and their interface with a PXI DAQ card
NI brings automated test and automated measurement expertise from an array of industries. This broad expertise allows us to create technology like SLSC from our observations of cross-industry needs. However, you need products that are targeted to your specific application. That’s why SLSC, designed to be an open platform, is enhanced by modules created by NI, our partners, and you through our module development kit (MDK).
Our partners, like Bloomy who has created a MIL-STD-1553 module for SLSC, bring domain expertise that yield products that are specific to your industry and unique test needs.
Below is a list of products currently available for SLSC from NI and NI partners. Due to the complex nature of HIL systems, please contact us for assistance when reviewing the technology listed below. NI and our Alliance Partners are dedicated to ensuring your test requirements are met.
NI offers prototyping, digital I/O, routing, fault insertion modules, and more. For a full list, visit our SLSC products category. In addition, many NI partners offer SLSC modules that you can incorporate into your system.
|Rear Transition Interfaces*||NI Part Number||Vendor||Description|
|RTI-12301B||786330-01||NI||RTI DIO 32 for SHC68-C68-RDIO2|
|RTI-12302||785377-01||NI||64 Ch for RDIO2|
|RTI-12303||785375-01||NI||DIO/AO/AI X 4 Bank Nanofit|
*See module user manuals for RTI recommendations.
|Cables*||NI Part Number||Vendor||Description|
|SH37F-37M-1||778621-01||NI||37-pin Female to Male Shielded I/O Cable, 1 meter|
|SH37F-37M-2||778621-02||NI||37-Pin Female to Male Shielded I/O Cable, 2 meter|
*See module user manuals for cable recommendations.
|Accessory||NI Part Number||Vendor||Description|
|Front Panel Filler Kit||785206-01||NI||4 count|
|Rear Panel Filler Kit||785207-01||NI||4 count|
|Filter Replacement Kit||785208-01||NI||N/A|
|Fan Replacement Kit||785218-01||NI||N/A|
|Power Connector||785219-01||NI||5 count|
|RTI Strain Relief||785999-01||NI||5 count|
While NI and our partners are developing and releasing modules we feel will be widely used, we know that there are specific requirements that are unique to your test system. To address these needs, our partners can design and deliver a test system based on NI’s platform that is tailored to your unique test demands.786924-01
An NI Partner is a business entity independent from NI and has no agency, partnership, or joint-venture relationship with NI.