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Data Mapping
3.3
Counters
3.3.1
ASDU
36
Metering values (e.g. kWh) are not defined in the IEC standard and there are no com-
patible data units available which are suitable for the transmission of metered values.
The private data unit 205 has been defined for the transmission of metered values
using Class 1 data format.
Only one metering value per data unit is transmitted. There exists a cyclic interval for
transmitting the counters which is set fixed to 1 min in SICAM P50.
The structure of the Application Service Data Unit 205 (ASDU 205) is defined as fol-
lows:
Structure element
Type identification
Variable structure qualifier
Cause of transmission
Device address
Function type
Information number
Counter
Time
Counter definition (4 Byte):
Bit 8
Bit 7
7
Byte 1
2
15
Byte 2
2
23
Byte 3
2
31
Byte 4
2
Irrelevant
Table 3-5
Application Service Data Unit (ASDU)
Comment
205
0x81
0x01
ADDR
FUN
INF
see definition below
ms
min
hours
Bit 6
Bit 5
Bit 4
> Metered value <
> Metered value <
> Metered value <
27
29
28
2
2
2
: Sign
Power Meter, IEC 60870-5-103, Manual
E50417-B1076-C375-A4, Release 11.2012
Bytes
1
1
1
1
1
1
4
2
1
1
Bit 3
Bit 2
Bit 1
0
2
8
2
16
2
24
Metered value
2
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