Mitsubishi Electric QJ81DL96 User Manual page 14

Data logging, event logging, and report functions precautions
A
- 12
(1) Data logging, event logging, and report functions
(a) The data logging, event logging, and report functions of the high speed data
logger module are the best effort functions.
Since module processing time changes according to the settings and status of
other devices, it may not operate with the set data sampling interval. Run the
system by fully verifying the processing time of each function when constructing it.
For processing time, refer to the following chapter.
 CHAPTER 17 PROCESSING TIME
(b) If data logging, event logging, or report functions are used, they have an affect on
the sequence scan time of the access target CPU. Run the system by fully
verifying the affect to the sequence scan time when constructing it. For the affect
to the sequence scan time, refer to the following section.
 Section 17.3 Effect on Sequence Scanning Time
(c) If exponential format is selected for the data output format with the data logging,
event logging, or report setting, rounding errors will occur in the range of the
number of digits that exceed the number of digits set for the decimal part.
(d) If the result of the linear function transformation with the scaling function exceeds
the maximum or minimum range of the specified output format, the maximum or
minimum value is output in binary format. Therefore, when outputting in the binary
format, errors may occur in the output values.
(e) E-mail transmissions/file transfers via the saved file transfer function may take a
few seconds to tens of seconds depending on the network line/transmission size.
Target files may be deleted before e-mail transmission/file transfer completes
depending on the settings.
Review the file switching timing and the number of files saved setting and
lengthen the time until the file is deleted.
(f) When CSV files are opened with Excel, the date column's format is displayed in
Excel's default setting. Set the cell format as necessary.
(g) Since general data sampling specified data and report current value data are
sampled asynchronously with the sequence scan, data separation may occur. If
data separation must be prevented, set the number of device points sampled at
one time to less than the access units, or set the module to use high speed data
sampling.
(h) When CSV files are opened with Microsoft
displayed depending on the number of the data setting or number of file switching
lines.
In this case, open the CSV files with Microsoft
® ®
Excel 2003, all the data may not be
®
®
Excel 2007 or later, or text editor.