Mitsubishi MELSEC-Q Series User Manual page 31

3
SPECIFICATIONS
(3) 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]
[When n=2]
[When n 3]
Setting range of time constant is 320 to 5000ms.
When setting a value out of the setting range, an error (error code 32 ) occurs.
Y = 0
n
t
Y = y +
n n-1
t + TA
t
Y = Y +
n n-1
t + TA
Y : Current measured
n
temperature
Y : Preceding measured
n-1
temperature value
n: Number of sampling times
TA: Time constant (s)
*: Conversion completion flag turns ON(1) when n 2.
(y - y )
n n-1
(y - Y )
n n-1
y : Measured temperature value before
n
smoothing
y : Preceding measured temperature
n-1
value before smoothing
Conversion time (320ms)
t:
3.2 Function List
3.2.1 Temperature conversion system
1
2
3
4
5
6
7
8
3
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