App-30
IM DL850E-01EN
Appendix
The data types are shown below.
Module/Data Type
Bit Count
Value Type
VDataType
2ch module, SCAN, temperature SCAN, Math, RMath
−
IS2
LOGIC
−
B16
CAN, CAN/LIN
2 to16
Unsign
IU2
2 to16
Sign
IS2
17 to 32
Unsign
IU4
17 to 32
Sign
IS4
−
Float
IS2
1 to 8
Logic
B16
Bit data is stored in 16 bits. The bits are arranged in order from the least significant bit (bit 1 to bit 8), and the
highest 8 bits are not used.
Waveform Data
Waveform data begins DataOffset bytes into the file
1
.
Data is arranged in order by trace. The number of data points is indicated by BlockSize of each trace in the
waveform analysis information. The data size of each point is indicated by VDataType.
Due to different sampling rates on the measurement module, the number of data points may vary for each trace.
For waveform data saved using the “history all” feature, the data of all history entries is stored for each trace.
The history entries are arranged in order from the oldest to the most recent. The number of stored history
entries can be verified by BlockNumber in the waveform analysis information.
:
:
Trace -1
Trace -2
Trace -3
Trace -4
Trace -1
Trace -1
Trace -1
Trace -2
Trace -2
Trace -2
History –n
History –1
History –0
History –n
History –1
History –0
Data example saved
using “history all”
Data example saved for
one history entry
1 “DrAW” chunks hold waveform data (“dsRW” chunks hold dual capture waveforms).
A “DrAW” chunk contains “the data size in chunk” followed by the file data size (4 bytes) and file number (4
bytes). DataOffset points to the head of the raw data, which comes after these pieces of data.
In the case of a “dsRW” chunk (used in dual capturing), the head of the raw data comes immediately after “the
data size in chunk,” and thus DataOffset (DHDR) also points to this position.
StartOffset
Sub channel data may not begin from the first point of the main channel data.
In such a case, it begins after the “start offset” of the main channel data.
Normally, this information does not need to be considered.