ABB A43 User Manual

Communication with M-Bus
A43/A44 256 2CMC48001M0201
User Manual Revision: C
About the
data sent out
The meter will send out harmonic data for one phase in each telegram, which
means 4 telegrams in a 3-element meter (for the 3 phase currents and the
neutral), 2 telegrams in a 2-element meter (for the phase 1 and 3 currents) and 1
telegram in a single phase meter.
Data sent out will be the total harmonic distortion and the harmonics with num-
bers 2-16. Note that the total harmonic distortion is calculated from the
harmonics measured and is thus not the true total harmonic distortion, which
would require all harmonics (up to infinite frequency) to be measured.
Note – Data may temporarily be marked "not available" if there are disturbances on
the net (for example due to short voltage dips) making the frequency measurement
invalid. Also directly after startup all harmonics will be marked "not available" as
they haven't been measured yet. As the harmonics are measured sequentially one
at a time they will be available one by one.
10.4.5.1 Examples of Readouts of Current Harmonics Data
Comments
In the following are 2 examples of readouts of current harmonics data. The second
example, which is in telegram format, is commented. The comments are preceded
by semicolon. The data in both telegrams is hexadecimal.
Example 1
The readout telegram for a phase contains the following data:
Byte No.
Size
Value
Description
1
1
68
Start character
2
1
C0
L-field, calculated from C field to last user data
3
1
C0
L-field, repeated
4
1
68
Start character
5
1
08
C-field, RSP_UD
6
1
xx
A-field, address
7
1
72
CI-field, data send, LSB first
8-11
4
xxxxxxxx
Meter serial number, 8 BCD digits
12-13
2
4204
Manufacturer: ABB
14
1
xx
Protocol version
15
1
02
Medium, 02=electricity
16
1
xx
Access number
17
1
xx
Status
18-19
1
0000
Signature (0000=no encryption)
20
1
02
DIF size, 2 byte integer
21
1
FF
VIF next byte is manufacturer specific
22
1
ED
VIFE current harmonics
23
1
FF
VIFE next byte is manufacturer specific

ABB A43 Specifications

General

Brand	ABB
Model	A43
Category	Measuring Instruments
Language	English