Measurement Computing Personal Daq/3000 Series - Manual (Page 56)

Criteria
Input Signal is Equal to X
Action
Driven by Condition
Compare
X To:
Setpoint Definition: Update Conditions:
Limit A or
Limit B
• Equal to A
• Below A
• Above B
(Choose 1)
X = A
X < A
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-
Hysterisis
Mode)
• Inside
• Outside
(Choose 1)
B < X < A
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*
(Hysterisis
Mode)
• Above A
• Below B
(Both conditions are
checked when in
Hysterisis Mode)
X > A
X < B
Hysterisis 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”,
then Output Value 2 until the signal goes outside the window “low”
and (b) if the signal is outside the window low, then Output Value 1
until the signal goes outside the window “high.” There is no
change to the detect signal while within the window.
* Value A defines the upper limit of the Window and Value B defines the low limit.
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.)
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 setpoints,
in total, applied to channels within a scan group.
Detection setpoints act on 16-bit data only. Since the Personal Daq/3000 Series modules have 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 1 detection setpoint for the
counter’s lower 16-bit value and 1 detection setpoint for the counter’s higher 16-bit value.
6-2 Setpoint Configuration for Output Control 887894 Personal Daq/3000 Series User’s Manual