4. Function
48
DIO-3232T-PE, DI-64T-PE, DO-64T-PE
Digital Filter Function
Using this feature, the <DIO-3232T-PE>, <DI-64T-PE> can apply a digital filter to every input pin,
thereby preventing wrong recognition of input signals from being affected by noise or chattering.
Digital Filter Function Principle
The digital filter checks the input signal level during
the sampling time of the clock signal. When the
signal level remains the same for the digital filter set
time, the digital filter recognizes that signal as the
input signal and changes the signal level of the PC
If the signal level changes at a frequency shorter than
the set time, therefore, the level change is ignored.
Figure 4.1. Digital Filter Function Principle
Set Digital Filter Time
Set the digital filter time to 0 - 20 (14h).
Setting the digital filter time to 0 disables digital filtering. It is set to 0 when the power is turned on.
Figure 4.2 shows the relationships between digital filter time settings and the actual digital filter times.
Digital Filter Time[sec.] = 2
n
/ (8 x 10
6
)
n: = setting data(0 - 20)
Setting Data
(n)
Digital Filter
Time
Setting Data
(n)
Digital Filter Time
Setting Data
(n)
Digital Filter Time
0 (00h)
The filter function is
not used.
7 (07h)
16
μ
sec 14
(0Eh)
2.048msec
1 (01h)
0.25
μ
sec 8
(08h) 32
μ
sec 15
(0Fh)
4.096msec
2 (02h)
0.5
μ
sec 9
(09h) 64
μ
sec 16
(10h)
8.192msec
3 (03h)
1
μ
sec 10
(0Ah) 128
μ
sec 17
(11h)
16.384msec
4 (04h)
2
μ
sec 11
(0Bh) 256
μ
sec 18
(12h)
32.768msec
5 (05h)
4
μ
sec 12
(0Ch) 512
μ
sec 19
(13h)
65.536msec
6 (06h)
8
μ
sec
13 (0Dh)
1.024msec
20 (14h)
131.072msec
Figure 4.2. Digital Filter Time and Setting Data
CAUTION
-
If you set the digital filter time, the filter applies to all input pins. You cannot apply the filter only
to a specific filter.
-
Do not set Setting Data to a value outside the above range as doing so can cause the board to
malfunction.
Input Signal
Filter Setting Time
Invalid
Valid
Input to PC
Input Signal
Digital
Filter
Input to PC
Содержание DI-64T-PE
Страница 7: ...vi DIO 3232T PE DI 64T PE DO 64T PE ...
Страница 41: ...2 Setup 34 DIO 3232T PE DI 64T PE DO 64T PE ...
Страница 57: ...4 Function 50 DIO 3232T PE DI 64T PE DO 64T PE ...
