IOtech DaqBoard/3000USB Series, User Manual

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In the example [upper portion of the preceding figure], the setpoint placed on analog Channel 5 updated
DAC1 with 0.0V. The update occurred when Channel 5’s input was less than the setpoint (Limit A).
When the value of Channel 5’s input was above setpoint Limit A, the condition of <A was false and DAC1
was then updated with
minus 1.0V.
Control outputs can be programmed on each setpoint. Detection for Channel 4 could be used to update the
P2C digital output port with one value (70h in the example) when the analog input voltage is within the
shaded region and a different value when the analog input voltage is outside the shaded region (30h in the
example).
Detection on an Analog Input, Timer Output Updates
Update Mode: Update on True and False
Criteria Used: Inside Window
The figure below shows how a setpoint can be used to update a timer output. Channel 23 is an analog
input channel. It could be any analog input channel but in this example it happens to be on a PDQ30
expansion module. A setpoint is applied using
Update on True and False , with a criteria of inside-the-
window, where the signal value is inside the window when simultaneously less than Limit A but greater
than Limit B.
Whenever the Channel 23 analog input voltage is inside the setpoint window (condition True), timer0 will
be updated with one value; and whenever the Channel 23 analog input voltage is outside the setpoint
window (condition False) timer0 will be updated with a second output value. An output value of 65535
will stop the timer.
Limit A
(for Channel 23)
Limit B
(for Channel 23)
Detection Signal
Timer0
Updating a Timer Output
Update on True and False
6-8 Setpoint Configuration for Output Control
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DaqBoard/3000 Series User’s Manual