Flintec PC6D User Manual
Page 31
Manual PC6D CANopen Page 31
5.4 Filter setting Commands – FM, FL, UR
Using the commands FM and FL, a digital filter type and strength can be set which will
eliminate most of the unwanted disturbances. The command UR is used for the average
building. Please note that these filters are positioned immediately after the A/D Converter and
therefore affect all aspects of the weighing operation.
[Please read the note TPDO1 regarding index 1006 on page 22]
FM
Filter Mode FIR / IIR
[ 2100sub09 ]
Choose filter mode, permitted values are “0” for IIR and “1” for FIR.
Master (PC / PLC) sends
Device responds
Result
FM M+00001
Request: FM = 1 (FIR)
FM_0 OK
Setting: FM = 0 (IIR)
WP OK
Setting saved
The digital IIR filter works as a low-pass filter of 2nd order with Gaussian characteristic,
damping is 40 dB/decade; see table mode 0.
The digital FIR filter works as a low-pass filter with quick response; damping see table
mode 1.
Factory default: 0
FL
Setup filters
[ 2100sub04 ]
Command for setup cut off frequency, permitted values are 0 … 8.
Master (PC / PLC) sends
Device responds
Result
FL F+00003
Request: FL = 3
FL_1 OK
Setting: FL = 1
WP OK
Setting saved
Filter values can be chosen between 0 and 8, see table below.
FL= 0 means no filter in mode 0 or 1 (command FM).
Factory default: 3
Mode 0 Characteristic (IIR-Filter)
FL
Settling time to 0.1%
(ms)
3dB Cut-off frequency
(Hz)
Damping @300Hz
(dB)
Output-rate*
(samples/s)
0 no
filtering
**
1200
1 55
18
57 1200
2 122
8
78 1200
3 242
4
96 1200
4 322
3
104 1200
5 482
2
114 1200
6 963
1
132 1200
7 1923
0.5
149 1200
8 3847 0.25
164 1200
* Output-rate = 1200/2
UR
samples/s
** Antialiasing filter 17 Hz @ 60 dB/dec