Technical description Chapter 8
APCI-/CPCI-1500
35
Input frequencies
The input frequency for the timer is selected through the software function
i_APCI1500_InitTimerInputClock (...)
Available frequencies:
111.86 kHz
±
100 ppm,
3.49 kHz
±
100 ppm,
1.747 kHz
±
100 ppm.
IMPORTANT!
The timer component internally operates with half of the input frequency.
Data
Approximate watchdog times:
Input frequency
17.9 µs
Æ
1175 ms
111.86 kHz
574 µs
Æ
37.65 s
3.49 kHz
1.14 ms
Æ
74.9 s
1.747 kHz
Option (only implemented for the APCI-1500)
The counter input channels 1, 2 and 3 can be equipped with fast optical couplers.
The maximum input frequency is then 140 kHz. (Standard frequency: 10 kHz)