Siemens SICAM P 7KG7755 - Counters; Asdu

Data Mapping
36
Power Meter, IEC 60870-5-103, Manual
E50417-B1076-C375-A4, Release 11.2012
3.3 Counters
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.
3.3.1 ASDU
The structure of the Application Service Data Unit 205 (ASDU 205) is defined as fol-
lows:
Counter definition (4 Byte):
Table 3-5 Application Service Data Unit (ASDU)
Structure element Comment Bytes
Type identification 205 1
Variable structure qualifier 0x81 1
Cause of transmission 0x01 1
Device address ADDR 1
Function type FUN 1
Information number INF 1
Counter see definition below 4
Time
ms 2
min 1
hours 1
Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
Byte 1 2
7
> Metered value < 2
0
Byte 2 2
15
> Metered value < 2
8
Byte 3 2
23
> Metered value < 2
16
Byte 4
2
31
Irrelevant 2
29
2
28
: Sign
2
27
Metered value 2
24