I have got a simple question about the specification of NI 9401. What does the "100ns" of NI 9401 means? I know 100ns refers to 100 nanosecond but what is it about? Is it a sample rate? Or rise time? Or something else?
This specification refers to the maxim speed at what you can actually read or write to a digital line of the module. That means that It would take you at least 100 ns to turn a digital output of the module ON or to turn it OFF.
Your program, the hardware you use ( FPGA, cDAQ, etc..), OS, etc... affect the final execution time but you should consider the hardware/module limitations as well before deciding what module is appropriate for your application.