FOXBORO AD908AC module

FOXBORO AD908AC module

Technical data of product parameters

When set for STI mode, the PID AD908AC executes and updates the CV every time the
PID instruction is scanned in the control program. When you select STI,
program the PID instruction in the STI interrupt subroutine. The STI routine
should have a time interval equal to the setting of the PID “loop update”
parameter. Set the STI period in word S:30. For example, if the loop update
time contains the value 10 (for 100 ms), then the STI time interval must also
equal 100 (for 100 ms).The loop update (word 13) is the time interval between PID calculations. The AD908AC
entry is in 0.01 second intervals. Enter a loop update time five to ten times
faster than the natural period of the load. The natural period of the load is
determined by setting the reset and rate parameters to zero and then increasing AD908AC
the gain until the output begins to oscillate. When in STI mode, this value
must equal the STI time interval value loaded in S:30. The valid range is 0.01 to
10.24 seconds. See page 11-12 for help entering STI setpoint.Scale your analog input by calculating the slope (or rate) of the analog
input range to the PV range (0 to 16383.) For example, an analog input
with a range of 4 to 20mA has a decimal range of 3277 to 16384. The
decimal range must be scaled across the range of 0 to 16383 for use as
PV. AD908AC
2. Scale the CV to span evenly across your analog output range. For
example, an analog output which is scaled at 4 to 20mA has a decimal
range of 6242 to 31208. In this case, 0 to 16383 must be scaled across
the range of 6242 to 31208.
Once you have scaled your analog I/O ranges to/from the PID
instruction, you can enter the minimum and maximum engineering units
that apply to your application. For example, if the 4 to 20mA analog
input range represents 0 to 300 PSI, you can enter 0 and 300 as the
minimum (Smin) and maximum (Smax) parameters respectively. The
Process Variable, Error, Setpoint, and Deadband are displayed in
engineering units in the PID Data Monitor screen. Setpoint and
Deadband can be entered into the PID instruction using engineering
units.

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