Mitsubishi Electric FX3G SERIES Programming Manual page 346

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
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
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
344
Input filter value when set to "0"
*3
-16M , FX
3U
n
When X010 is ON
The image memory of X000 to
K 1
X017 *4 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
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 range from
2
5 μs*
50 μs
*3
200 μs
-16M .
3UC
-16M , FX
3U
*4 is
-16M .
3UC
-16M is used.
3UC
Input
processing
Set value of D8020
(Initial value: 10 ms)
Sequence
program
REFF instruction
1 ms
REFF instruction
20ms
END
Output
processing