Mitsubishi Electric MELSEC FX3U Programming Manual page 361

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
Cautions
1. Setting the filter time "n"
Set "n" within the range from K0 (H0) to K60 (H3C) [0 to 60 ms].
2. Function of the input filter
A digital filter is built into the inputs X000 to X017
range from 0 to 60 ms using applied instructions. When the filter time is set to "0", the input filter value is as
follows.
Input number
X000 to X005
X006, X007
*3
X010 to X017
*1. X000 to X007 in the FX
When setting the input filter time to "5 µs", perform the following actions:
*2.
- Make sure that the wiring length is 5 m or less.
- Connect a bleeder resistor of 1.5 kΩ (1 W or more) to the input terminal, and make sure that the
load current in the open collector transistor output of the external equipment is 20 mA or more
including the input current of the main unit.
*3. The filter time is fixed to 10 ms in X010 to X017 when the FX
Program example
1. Relationship between the program and the filter time
X010
FNC 51
REFF
X000
X001
M8000
FNC 51
REFF
X000
*4. X000 to X007 in the FX
Input filter value when set to "0"
2
5 µs*
50 µs
*3
200 µs
-16M , FX
3U 3UC
n
When X010 is ON
The image memory of X000 to
K 1
*4
X017 is refreshed with an input
filter of 1 ms.
The image memory of X000 to X017
K 20
refreshed with an input filter of 20 ms.
The image memory is refreshed with
END
the input filter value set in D8020.
-16M , FX
3U 3UC
13 High Speed Processing – FNC 50 to FNC 59
13.2 FNC 51 – REFF / Refresh and Filter Adjust
*1
. The filter time can be changed in 1 ms units within the
-16M .
-16M , FX
3U
processing
Sequence
REFF instruction
*4 is
REFF instruction
processing
-16M .
-16M is used.
3UC
Input
Set value of D8020
(Initial value: 10 ms)
program
1 ms
20ms
END
Output
11
12
13
14
15
16
17
18
19
20
359