Manufacturer Specific Profile Area
CAN-CBX-AI814
Manual • Doc.-No.: C.3020.21 / Rev. 1.5
Page 99 of 108
8.11.5 Accu N (2402
h
)
Index
Sub-
index
Description
Value range
Default
Data type
Access
mode
2402
h
0
Number of entries
8
8
unsigned 8
ro
1
Accu_Count_1
0...8
3
unsigned 8
rw
2
Accu_Count_2
0...8
3
unsigned 8
rw
3
Accu_Count_3
0...8
3
unsigned 8
rw
4
Accu_Count_4
0...8
3
unsigned 8
rw
5
Accu_Count_5
0...8
3
unsigned 8
rw
6
Accu_Count_6
0...8
3
unsigned 8
rw
7
Accu_Count_7
0...8
3
unsigned 8
rw
8
Accu_Count_8
0...8
3
unsigned 8
rw
This object defines, how many analog values are to be added up for the averaging.
By the appropriate pre-processing of the output value of the A/D-converter the result of this addition
is always a 16-bit value in the two’s complement representation.
The number of additions is calculated as:
number of additions = 2
(Accu_Count_x)
Up to 256 values can be added up (default setting: 8 values are added up).
Advantage:
Filter with decimation, improvement of the resolution, limitation of the data rate.
The data rate is calculated as follows:
Data rate =
=
Sample Rate
Number of
additions
_
_
_
1
2
/
_
(
_
_ )
Sample Time
Accu Count x
In default (Accu_Count = 03, Sample_Time = 312,5
Í
s) the data rate is 400 SPS.
Disadvantage: The measured value is not updated until the addition is finished.