APPENDIX
MANUAL TME400-VCF · EN08 · July, 01
st
2021
106
B3 Calculation of the storage size
The total available storage for archives is 506880 bytes.
Archive type
Bytes /
entry
Amount
entries
Sum in
bytes
Parameter archive (custody transfer)
34
300
10200
Parameter archive (non-custody transfer)
34
300
10200
Event archive
12
200
2400
Periodic archive
40
9000
360000
Daily archive
40
100
4000
Monthly archive
40
25
1000
Sum
387800
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
Data type Length in Bytes
Position number of the next archive
(largest value = 9999, then again = 0 )
UINT16
2
Index oldest entry
UINT16
2
Index newest entry
UINT16
2
CRC16 (Modbus)
UINT16
2
Total length: 8
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:
Summary of Contents for TME400
Page 1: ...Operating Manual Turbine Meter TME400 VC VCF Issued July 01st 2021 Version 08 Firmware 1 06 ...
Page 50: ...2 Installation MANUAL TME400 VCF EN08 July 01st 2021 44 Ex version ...
Page 51: ...2 Installation MANUAL TME400 VCF EN08 July 01st 2021 45 Ex version with current module ...
Page 52: ...2 Installation MANUAL TME400 VCF EN08 July 01st 2021 46 Non Ex version ...
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