Measurement Computing PCI-2513 User Manual page 28

PCI-2513 User's Guide
A channel's detect signal shows a rising edge and is True (1) when the channel's data meets the setpoint criteria.
The detect signal shows a falling edge and is False (0) when the channel's data does not meet the setpoint
criteria. The True and False states for each setpoint criteria are explained in the
register" section on page 30.
Criteria – input signal is equal to X
Compare X to: Setpoint definition (choose one)
 Equal to A (X = A)
 Below A (X < A)
Limit A or Limit B
 Above B (X > B)
 Inside (B < X < A)
Window* (non-
 Outside: B > X; or, X > A
hysteresis mode)
 Above A (X > A)
 Below (B X < B) (Both
Window*
(hysteresis mode)
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 17. 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.
conditions are checked
when in hysteresis mode
Action - driven by condition
Update conditions:
True
only:
 If True, then output value 1
 If False, then perform no action
True False
and :
 If True, then output value 1
 If False, then output value 2
True
only
 If True, then output value 1

If False, then perform no action
True False
and
 If True, then output value 1
 If False, then output value 2
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
value 2 until the signal goes outside the window
(b) if the signal is outside the window
until the signal goes outside the window
to the detect signal while within the window.
28
Functional Details
"Using the setpoint status
high
, then output
low,
and
low
, then output value 1
high
. There is no change