National Instruments NI 9421

NI 9421/9423 14 ni.com
Specifications
The following specifications are typical for the range –40 to 70 °C
unless otherwise noted. The specifications are the same for the
NI 9421 and the NI 9423 unless otherwise noted. All voltages are
relative to COM unless otherwise noted.
Input Characteristics
Number of channels.......................... 8 digital input channels
Input type .......................................... Sinking
Digital logic levels
OFF state
Input voltage ........................ ≤5V
Input current (NI 9421)........ ≤300 μA
Input current (NI 9423)........ ≤150 μA
ON state
Input voltage ........................ 11–30 V
Input current......................... ≥3mA