Advantech WISE-4470 Series, Руководство пользователя

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25 WISE-4471 Series User Manual
Chapter 4
S
ystem
Configuration
will return to the startup value, which is zero by default.
If
Keep Last Value
is enabled, the last counter value will be kept in the register
when the module is powered off. When the module is powered on, the counter
will continue to count from that value. When this function is disabled, powering
off the module will cause the counter to be reset and the count value in the reg-
ister to be reset to zero.

Frequency:
For pure digital input channels, WISE modules support frequency
mode, which calculates the frequency of the digital input signal of the selected
channel. The frequency value will be displayed in the
Frequency value
box on
the DI Status page.
Precision
can be configured here to decide the unit of fre-
quency for different kind of input range.
Value Reset Time
function is design for
deciding when will the frequency value been reset to zero if pulse bandwidth
longer than expect.

Low-to-High Latch:
Under low-to-high latch mode, once a digital input channel
detects that the logic level has changed from low to high, the logic status will
remain as "logic high" until the latch is cleared manually, which will return the
logic status to "logic low." The logic status is viewable on the latch status LED
display on the
DI Status
page. Clear the latch by clicking
Clear
on this page.

High-to-Low Latch:
Under high-to-low latch mode, once a digital input channel
detects that the logic level has changed from high to low, the logic status will
remain as "logic low" the latch is cleared manually, which will return the logic
status to "logic high." The logic status is viewable on the latch status LED dis-
play on the
DI Status
page. Clear the latch by clicking
Clear
on this page.