Appendix A
Specifications
©
National Instruments Corporation
A-3
NI PCI-7342 Hardware User Manual
Stepper outputs
Maximum pulse rate ....................... 4 MHz (full, half, and microstep)
Minimum pulse width ..................... 120 ns at 4 MHz
Step output mode ............................ Step and direction or CW/CCW
Voltage range .................................. 0 to 5 V
Output low voltage .................. < 0.6 V at 64 mA sink
Output high voltage ................. Open collector with built-in
3.3 k
Ω
pull-up to +5 V
Polarity............................................ Programmable, active-high
or active-low
System Safety
Watchdog timer function ....................... Resets board to startup state
Watchdog timeout........................... 63 ms
Shutdown input
Voltage range .................................. 0 to 12 V
Input low voltage ..................... 0.8 V
Input high voltage .................... 2 V
Polarity..................................... Rising edge
Control ............................................ Disable all axes and
command outputs
Motion I/O
Encoder inputs........................................ Quadrature, incremental,
single-ended
Maximum count rate ....................... 20 MHz
Minimum pulse width ..................... Programmable; depends
on digital filter settings
Voltage range .................................. 0 to 12 V
Input low voltage ..................... 0.8 V
Input high voltage .................... 2 V
Minimum index pulse width ........... 60 ns
