Mitsubishi Electric MELSEC-Q series User Manual page 41

(3) Primary delay filter
Depending on the set time constant, digital output values with smoothed noise can be obtained. A smoothing
degree varies by setting the time constant.
The following are the relational expressions of time constants and digital output values.
*1
[n = 1]
Y = 0
n
[n = 2]
Y = y +
n n-1
[n  3]
Y = Y +
n n-1
Y
: Present digital output value
n
Y
: Last digital output value
n-1
Number of sampling
n :
processing
TA : Time constant
*1 When n is 2 or larger, Conversion completed (1) is stored in Conversion completed flag (Un\G10).
*2 Set a value which is equal to or larger than the sampling cycle. If the time constant is smaller than the sampling cycle,
the error (error code: 32) occurs, and the digital output value becomes 0.
t
(y - y )
n n-1
t + TA
t
(y - Y )
n n-1
t + TA
y
: Digital output value before smoothing
n
y
: Last digital output value before smoothing
n-1
t
: Sampling cycle
*2
(ms)
CHAPTER 4 FUNCTIONS
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