Instruction Manual

Page 22 Manual MSC-64: Modbus on Ethernet
Mode 1 Characteristic (FIR-Filter)
FL
Settling time
to 0.1%
(
ms
)
3 dB Cut-
off
(Hz)
20 dB
damping at
frequency
(Hz)
40 dB
damping at
frequency
(Hz)
Damping in
the
stopband
(dB)
Stopband
(Hz)
Output rate
max.
(
sam
p
les/s
)
0 no filtering
**
600
1 47 19.7 48 64 >90 >80 600
2 93 9.8 24 32 >90 >40 300
3 140 6.5 16 21 >90 >26 200
4 187 4.9 12 16 >90 >20 150
5 233 3.9 10 13 >90 >16 120
6 280 3.2 8 11 >90 >13 100
7 327 2.8 7 9 >90 >11 85.7
8 373 2.5 6 8 >90 >10 75
** Antialiasing filter 17 Hz @ 60 dB/decade
Attention: In mode 1 the output rate depends on the selected filter level (FL) and will be
automatically adjusted by the LDM88.x.
UR Set the update rate (average building) [ Register = 2120, Type = Int32 ]
This command will define over how many measurements, from the preceeding IIR or FIR filter,
an average will be calculated. The average will be calculated over 2
UR
samples. Permitted values
0...7 (see table below).
UR 0 1 2 3 4 5 6 7
No. of samples
1
2 4 8 16 32 64 128
Check / adjustment update rate:
Master (PC / PLC) sends Device responds Result
UR U+0001
Request: average over 2 samples
UR_4 OK
Setting: average over 16 samples
Factory default: 0 [no average, = 600 samples/s]
Remark to Mode 1
Dependency Output Rate - averaging UR - Filter FL
UR Output Rate samples/s
FL0
FL1
19.7 Hz
FL2
9.8 Hz
FL3
6.5 Hz
FL4
4.9 Hz
FL5
3.9 Hz
FL6
3.2 Hz
FL7
2.8 Hz
FL8
2.5 Hz
0 600 600 300 200 150 120 100 85.7 75
1 300 300 150 100 75 60 50 42.85 37.5
2 150 150 75 50 37,5 30 25 21.42 18.75
3 75 75 37.5 25 18.75 15 12.5 10.71 9.38
4 37.5 37.5 18.75 12.5 9.38 7.5 6.25 5.36 4.69
5 18.75 18.75 9.38 6.25 4.69 3.75 3.13 2.68 2.34
6 9.38 9.38 4.69 3.13 2.34 1.88 1.56 1.34 1.17
7 4.69 4.69 2.34 1.56 1.17 0.94 0.78 0.67 0.59