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USB-1616HS-2 User's Guide Functional Details
36
Criteria – input signal is equal to X Action - driven by condition
Compare
X to:
Setpoint definition
(choose one)
Update conditions:
Limit A or
Limit B
Equal to A (X = A)
Below A (X < A)
Above B (X > B)
True only:
If True, then output value 1
If False, then perform no action
True and False:
If True, then output value 1
If False, then output value 2
Window*
(non-hyste
resis
mode)
Inside (B < X < A)
Outside ( B > X; or, X > A)
True only
If True, then output value 1
If False, then perform no action
True and False
If True, then output value 1
If False, then output value 2
Window*
(hysteresis
mode)
Above A (X > A)
Below (A < X < B) (Both
conditions are checked when
in hysteresis mode
Hysteresis mode (forced update)
If X > A is True, then output value 2 until X < B is True, then
output value 1.
If X < B is True, then output value 1 until X > A is True, then
output value 2.
This is saying:
(a) If the input signal is outside the window high, output value 2 until
the signal goes outside the window low, and
(b) if the signal is outside the window low, output value 1 until the
signal goes outside the window high. There is no change to the detect
signal while within the window.
The detect signal has the timing resolution of the scan period as seen in the diagram below. The detect signal
can change no faster than the scan frequency (1/scan period.)
Figure 25. Example diagram of detection signals for channels 1, 2, and 3
Each channel in the scan group can have one detection setpoint. There can be no more than 16 total setpoints
total applied to channels within a scan group.
Detection setpoints act on 16-bit data only. Since the USB-1616HS-2 has 32-bit counters, data is returned
16-bits at a time. The lower word, the higher word, or both lower and higher words can be part of the scan
group. Each counter input channel can have one detection setpoint for the counter's lower 16-bit value and one
detection setpoint for the counter's higher 16-bit value.