Contec CNT-3208M-PE, Руководство пользователя, Страница: 51 / 81

4. Functions
44
CNT-3208M-PE
Asynchronous Clear
When incremental counting in the CW (clockwise) direction is set with phase-Z positive logic, this
product clears the counter when the phase-Z input goes high while phases A and B are in the input state.
this product starts counting at the rising edge of the phase-A signal while phase-Z in the input state.
Figure 4.6. Example counting during asynchronous clear
Phase-Z/CLR Input
Phase-Z is the signal to clear the counter to zero. The number of phase-Z inputs can be specified by
software.
Figure 4.7. Phase-Z enable frequency (Positive logic)
- The initial setting is “only the next phase-Z input is enabled once”.
- Phase-Z (negative logic) is enabled while the phase-Z input goes low.
- When the phase-Z/CLR input is not used, be sure to disable the phase-Z input.
Phase-A
(Phase-A/UP)
Phase-B
(Phase-B/DOWN)
Phase-Z
(Phase-Z/CLR)
Count value
2 3 1
* When incremental counting in the CW direction is set with phase-Z positive logic,
the board performs decremental counting at the rising edge of the phase-A signal
while the phase-B input remains low. When phase-Z negative logic is used,
the signal is enabled while the phase-Z input remains low.
1 0
Phase-Z input
Disable phase-Z input
Counter 0 Ignored
Phase-Z input
Enable the next phase-Z input only once
Counter 0 0
Start
Phase-Z input
Enable every phase-Z input
Counter 0 0
Start
0 0 0
Ignored Ignored Ignored
Ignored Ignored Ignored
CAUTION