Panasonic GM1 User Manual page 494

12.6 High-speed Counter Function
Behavior example of linear counter
Behavior example of ring counter
● If the count is decremented from the lower limit, the counter will roll over the count and
continue a decremental count from the upper limit.
● If the count is incremented from the upper limit, the counter will roll over the count and
continue an incremental count from the lower limit.
■
Enable / Displable overflow/underflow (for linear counters only)
Set the counter behavior to be performed when the count value reaches the specified upper
limit or lower limit.
Disable: Continues counting within the countable range for the system (-2,147,483,648 to
2,147,483,647) even if the specified upper limit or lower limit is reached.
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Select count input
● To import input signals from external devices, select "Count input".
● To measure the frequencies of external input signals or time based on the internal clock,
select "Internal clock".
● For internal clocks, you can select from 0.25 µs (4 MHz), 1.00 µs (1 MHz), 10 µs (100 kHz),
and 100 µs (10 kHz).
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