Mitsubishi Electric MELSEC-Q Structured Programming Manual page 228

FXCPU Structured Programming Manual
[Device & Common]
5. FX PLCs
0N
Inputs X000 to X007 have a digital filter circuit of 0 to 15 ms respectively. The digital filter constant is
determined by the value in the range from 0 to 15 stored in the special data register D8020.
D8020 is automatically set to "10 (ms)" when the PLC is powered ON from OFF.
Input terminal Filter
X000
X007
1) Program example for adjusting the input filter
When the program shown below is executed, the filter constant is changed to "0 ms".
Because the C-R filter is provided in the hardware, however, the filter constant actually becomes the
value shown in the table below when "0" is specified.
M8000
RUN monitor
Input number
X000 to X003
X004 to X017
• The input filter value can be changed as many times as needed in the middle of a program.
• The input filter adjustment described here is not necessary when high speed counters, input interrupts or
pulse catch relays (M8056 to M8059) are used.
226
0ms
0
1ms
1
Determined by the value stored in D8020 (Initial value: 10).
10
Input refresh
10ms
Image
15ms
15
memory
MOV
EN ENO
s d
K0 D8020
Input filter value when "0" is set
4 Operations of Special Devices (M8000 and later, D8000 and later)
4.2 Supplement of Special Devices (M8000 and later and D8000 and later)
50μs
200μs