NI PCI-7390, Руководство пользователя

Страница: 46 / 82

Appendix A Specifications
NI PCI-7390 User Manual A-2 ni.com
Output type ......................................RS-422, line-driver outputs
Voltage range...................................0 to 5 V optically isolated
Output high voltage ..................> 2.4 V at 20 mA
Output low voltage ...................< 0.4 V at 20 mA
Active state ......................................Programmable, active high
or active low
Power-on state ........................................Open/floating
System Reset
Watchdog timer function ........................Resets board to startup state
Watchdog timeout ...........................63 ms
Motion I/O
Quadrature encoder inputs
Maximum count rate........................4 MHz quadrature
Minimum pulse width......................250 ns
Input type.........................................Differential (RS-422 compatible)
Voltage range...................................0 to 30 V
1
, optically isolated
Input on voltage........................> 3 V at 5 V
1
Input off voltage .......................< 1 V at 5 V
1
Turn-on current................................14 mA maximum
Forward, reverse, and home inputs
Number of inputs.............................12 (3 per axis)
Minimum pulse width......................50
µ
s (digital filter disabled)
Input type.........................................Sinking or sourcing
Voltage range...................................0 to 30 V, optically isolated
Input on voltage........................11 to 30 V
Input off voltage .......................0 to 4 V
Turn-on current
11 V inputs ...............................4.5 mA maximum
30 V inputs ...............................12.5 mA maximum
Active state ......................................Programmable, active open
or active closed
1
Refer to the Connections for Input Voltages Higher Than 5 V section of Chapter 4, Signal Connections , for information about
connections to higher input voltages.