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12
FILTERS
Name
Modbus
address
CANopen®
Index/sub-
index
Profibus cyclic
IN/OUT
Acyclic DPV1
slot/index
Type Access
A/D conversion rate
0x0036
0x4000 / 0x00
R : 0x0240
W: 0x0241
0x04 / 0x00
Uint RW
filters activation
0x0037 LSB
0x4001 / 0x01
(byte)
R : 0x0242
W: 0x0243
0x04 / 0x01
Byte
RW
Low-pass order
0x0037 MSB
0x4001 / 0x02
(byte)
Byte
Low-pass cut-off frequency
0x0038
0x4001 / 0x03
R : 0x0244
W: 0x0245
0x04 / 0x02
Uint RW
Depth of moving average filter
on weight
0x0039
0x4001 / 0x04
R : 0x0246
W: 0x0247
0x04 / 0x03
Uint RW
Tolerance of clipping filter on
instant flow rates
0x003A
0x4001 / 0x05
R : 0x0248
W: 0x0249
0x04 / 0x04
Uint RW
Average flow rate determination
depth
0x0059
0x4700 / 0x03
R : 0x0278
W: 0x0279
0x07 / 0x02
Uint RW
12.1
Principles
eNod4
contains 4 filtering layers that are user-configurable :
•
filtering related to the A/D conversion rate (with rejection of the mains frequency)
•
a low-pass Bessel-type filter
•
a moving average weight filter
•
a self-adaptive filter
Except for the A/D conversion rate that is always enabled, none of these filters is mandatory. However, to perform
accurate measurements we recommend setting a combination of filters.
eNodView
software may be helpful in
designing the best filter configuration for the application.