PR electronics 2289, Руководство пользователя

Страница: 16 / 18

63 62
has 2 parameter settings, AtI - averaging time, and StS - number
of memories. The averaging time is the time that is averaged. The
number of memories to be selected is (1...14). The time between the
updates of the output is determined by the average time divided by
number of memories (AtI/StS). If AtI/StS is smaller than 20 ms, the
output will be updated every 20 ms.
Example:
With an average time of 10 s and 1 memory, the period between the
updates of the output will be (10/1) = 10 s. The output will typically
make a jump at the update.
If the number of memories is for instance 10, the period between the
updates of the output will be (10/10) = 1 s. Each memory (1…10) will
hold the average value for 1 s. The output is updated every second
by the average value of the 10 memories. This means that the jumps
on the output will be smaller. The 10 memories will be replaced
continously according to the FIFO method (first in, first out).
015 = Slope transmitter (dI / dt function):
The slope transmitter converts the slope (dI) of input A according to a
set period (dt) to an analogue output signal. Each time the set period
(dt) has expired, the input value is read. The latest readout is compared
to the previous, and the difference between these two values is the
slope of the input signal, which is converted to an analogue output
signal. The output is updated each time a period (dt) has expired. The
slope can be selected as either positive or negative. The input signal
can be averaged according to an exponential function so that it can be
applied to noisy signals.
Example:
Minimum slope (dIL) = 0%.
Maximum slope (dIH) = -1%.
Period = 5 seconds.
Analogue output = 4...20 mA.
Result:
Has the input value not been changed within 5 seconds, the output
will be 4 mA. Has the input value decreased by 0.5% after 5 seconds,
the output will be 12 mA. Has the input value decreased by 1% after 5
seconds, the output will be 20 mA.
016 = Analogue multiplexer:
Expression: (P1*A) and (P2*B).
The input (A or B) to be transferred to the output is selected by the
digital input. Input A has been selected when the digital input is
deactivated, and input B has been selected when the digital input
is activated. P1 and P2 are scale factors multiplied on input A or B
respec tively. When the scale factor is 1, the input value is scaled to
its full value. A scale factor of 0.5 will scale the input signal to half its
value.
5.2 FrQ - Frequency.
Common mode frequency suppression.
Possible selections are 50 or 60.
[Hz]
5.3 dSP - Default display.
The selected span is displayed in per cent. For modules with a Pt100
input, also °C can be displayed.
Possible selections are A or B
[Input] , OUt [Output], or °C
[Temperature] .
5.4 PAS - Password.
When the password is 040, changes can be made in all menu points.
When the password is <> 040, programming is blocked in all menu
points but open to a reading of settings.
Valid selections are 0...999.
[Password]