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APPENDIX
B3
Calculation of the storage size
The total available storage for archives is 506880 bytes.
Archive type
Parameter archive (custody transfer)
96
Parameter archive (non-custody transfer)
Event archive
Periodic archive
Daily archive
Monthly archive
Sum
B4
Archive header
Each archive type contains an administration header that gives information about
how to access the archive.
The header is arranged as follows:
Content
Position number of the next archive
(largest value = 9999, then again = 0 )
Index oldest entry
Index newest entry
CRC16 (Modbus)
There are four headers for each archive type, which are organized in memory as
ring buffers. This is to ensure that the information is stored safely in case of cell
defects in the EEprom. Each time a new archive entry is written, the corresponding
archive header is updated and stored as the next entry in the ring buffer:
Manual TME400-VMF · EN11 · January 22nd, 2024
Bytes /
Amount
entry
entries
34
300
34
300
12
200
40
9000
40
100
40
25
Data type
Length in Bytes
UINT16
2
UINT16
2
UINT16
2
UINT16
2
Total length: 8
Sum in
bytes
10200
10200
2400
360000
4000
1000
387800
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