Sample-and-hold amplifier. The control input holds the input value.
TRST block input
TRST block output
Integrator with time
constant
t
adjustable in minutes, and adjustable energy offset
P1
. The
control input sets the integrator to 0.
Formula :
(
)
y t
y t T
T
t
x P
r
r
( )
( \ )
=
+
⋅
+
1
y(t)
= integrator output
y(t-T
r
) = integrator output at last calculating cycle
T
r
= calculating cycle time = 80ms
t = time constant
x = integrator input
P1
= input offset (zero correction)
With a constant input value, the integrator output reaches this
value after elapse of the adjusted time constant
t
!
Example: A flow is measured in m
3
/h. The integrator shall measure the flow
total. As the measured flow is referred to time unit hours, the time constant
must also be 1 hour = 60 minutes. Parameter P1 can be used for zero
correction.
In the manual scanner mode, using the integrator is little purposeful, since a
channel is only used for calculation, if it happened to be selected. In the
automatic scanner mode, the scanning interval during which other channels
are measured is taken into account in the calculation.
However, input changes during this time are not measured, since the
channel is not measured!
As with function1.
Can be
switched off additionally
via control input
Ct-F2
!
9499-040-24701
11
trSt
IntE
LAG1
