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3.2 Function List
3.2.1 Temperature conversion system
3
SPECIFICATIONS
(4) Primary delay filter
By a preset time constant, measured temperature value of which excessive noise is
smoothed is output.
Depending on the time constant, the degree of smoothness changes.
Time constant is the time until the measured temperature value reaches to 63.2% of
the steady-state value.
The relational expression between the time constant and measured temperature
value is shown below.
[When n=1
*1
]
Y
n = 0
[When n=2]
[When n 3]
*1: Conversion completion flag turns ON(1) when n 2.
Setting range of time constant is 320 to 5000ms.
Set the time constant value which is twice as much as the sampling period (320ms).
If the time constant value is not twice as much as the sampling period (320ms), the
value in which the remainder is rounded down is set.
If a value outside the setting range is set, an error (error code: 32 ) occurs.
Y
n: Current measured
temperature
yn: Measured temperature value before
smoothing
Y
n-1: Preceding measured
temperature value
yn-1: Preceding measured temperature
value before smoothing
n: Number of sampling times
t:
Conversion time (320ms)
TA: Time constant (320 to
5000ms)
Yn = yn-1 +
t
t + TA
(yn - yn-
1)
Yn = Yn-1 +
t
t + TA
(yn - Yn-
1
)