Counters; Asdu - Siemens SIMEAS P 7KG7750 Manual

Data Mapping
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 SIMEAS 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
38
Structure element
Type identification
Variable structure qualifier
Cause of transmission
Device address
Function type
Information number
Counter
Time
Bit 8 Bit 7
7
Byte 1 2
15
Byte 2 2
23
Byte 3 2
31
Byte 4
2 Irrelevant
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, SIMEAS P 7KG7750/55, Manual
E50417-B1076-C375-A3, Release 01.2009
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