Appendix A
Specifications
©
National Instruments Corporation
A-3
Inhibit-in (alarm) and in-position inputs
Number of inputs ............................ 8 (2 per axis)
Minimum pulse width ..................... 50
µ
s
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
Trigger (position capture) inputs
Number of inputs ............................ 4 (Encoders 1 through 4)
Input type ........................................ Sinking
Voltage range .................................. 0 to 5 V, optically isolated
Input on voltage ....................... > 3 V
Input off voltage ...................... < 1 V
Turn-on current ............................... 14 mA maximum
Active state ..................................... Programmable, active high
or active low
Minimum pulse width ..................... 200 ns
Capture latency ............................... < 250 ns
Capture accuracy............................. 1 count
Maximum repetitive capture rate .... 100 Hz
Breakpoint (position compare) outputs
Number of outputs .......................... 4 (encoders 1 through 4)
Output type ..................................... TTL
Voltage range .................................. 0 to 5 V, optically isolated
Output high voltage ................. > 2.5 V at 16 mA
Output low voltage .................. < 0.5 V at 10 mA
Active state ..................................... Programmable, active high
or active low
Pulse width...................................... 200 ns
Power-on state................................. 22 k
Ω
pullup to is5 V
