3
SPECIFICATIONS
3.2 Function List
3.2.1 A/D conversion methods
3 - 16
1
OVERVIEW
2
SYSTEM
CONFIGURATION
3
SPECIFICATIONS
4
SETUP AND
PROCEDURES
BEFORE OPERATION
5
UTILITY PACKAGE
(GX CONFIGURATOR-
AD)
6
PROGRAMMING
7
ONLINE MODULE
CHANGE
8
TROUBLESHOOTING
Moving average processing at the preset count of 4 times
(3) Primary delay filter
A digital value whose transient noise has been smoothed is output according to the
preset time constant.
The degree of smoothing varies with the time constant setting.
The relational expression of the time constant and digital output value is indicated
below.
*1 The A/D conversion completed flag turns ON when n 2.
[If n = 1
*1
]
Yn = 0
[If n = 2]
[If n 3]
Yn : Current digital output value yn : Pre-smoothing digital output value
Yn-1 : Immediately preceding digital output
value
Yn-1 : Immediately preceding
pre-smoothing digital output value
n : Sampling count
t
:
A/D conversion time (0.01
number of conversion enabled chan-
nels)(s)
TA : Time constant (s)
1)
2)
3) 4)
5)
6)
7)
8) 9)
10) 11)
12)
Sampling time
Digital output value
Time [ms]
First storage
1)+2)+3)+4) 2)+3)+4)+5) 3)+4)+5)+6)
4
Second storage
4
Third storage
4
Data transition inside buffer memory
Buffer memory
First storage
Second storage
Third storage
A/D conversion completed flag ON
A/D conversion
value
12000
6000
0
Yn = yn-1 +
t
t + TA
(yn - yn-1)
Yn = Yn-1 +
t
t + TA
(yn - Yn-1)
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