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Appendix A Specifications
© National Instruments Corporation A-3 7344/7334 Hardware User Manual
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 kΩ 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
Max count rate ................................20 MHz
Min 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
Min index pulse width .................... 60 ns
Forward, reverse, and home inputs
Number of inputs ............................12 (3 per axis)
Voltage range..................................0 to 12 V
Input low voltage.....................0.8 V
Input high voltage....................2 V
Polarity............................................Programmable, active-high
or active-low