Mitsubishi Electric RD81DL96, User Manual

Page: 13 / 124

11
Considerations for data logging, event logging, and report functions
■
Data logging, event logging, and report functions
• The data logging, event logging, and report functions are best effort functions. Since the processing time of a module varies
depending on the setting and the status of other devices, these functions may not perform at the set sampling interval. Run
the system by fully verifying the processing time of each function when constructing it. For processing time, refer to the
following manual.
(
 MELSEC iQ-R High Speed Data Logger Module User's Manual(Application))
• If data logging function, event logging function, or report function are used, they affect the sequence scan time of the
access target CPU module. Run the system by verifying how the sequence scan time is affected when configuring the
system.
(

MELSEC iQ-R High Speed Data Logger Module User's Manual(Application))
• 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.
• 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 will be output in binary format. Therefore, when outputting in the
binary format, errors may occur in the output values.
• The file transfer/e-mail transmission via the file transfer function/e-mail function may take from a few seconds to tens of
seconds depending on the network line or transmission size. Target files may be deleted before file transfer/e-mail
transmission 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.
(
 MELSEC iQ-R High Speed Data Logger Module User's Manual(Application))
• When a CSV file is opened with Excel, the date column format is displayed in the default setting of Excel. Set the cell format
as necessary.
• Since general 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 sampling.
■ Data logging function
• Immediately after switching the programmable controller system ON, if a trigger occurs before sampling the number of lines
of data before the trigger, the data before the trigger may be a few lines less than the specified amount.
• When triggers continuously occur with the trigger logging function, triggers may not be detected or the number of lines of
data specified before the trigger may not be output. For operation when triggers continuously occur, refer to the following
manual.
(

MELSEC iQ-R High Speed Data Logger Module User's Manual(Application))
■
Report function
• Immediately after switching the programmable controller system ON, if a creation trigger occurs when data does not exist in
the data logging file, an error occurs in the high speed data logger module. Configure and construct the system so that the
creation trigger occurs after data is saved in the data logging file.
• Report output takes time. Therefore, according to the data logging save setting, the data logging file including the data
when the creation trigger occurs, may be deleted before the report output is completed. In this situation, the data for the
specified number of records are not output, and an error occurs in the high speed data logger module. Check the Point in
the following manual when configuring and constructing the system.
(

MELSEC iQ-R High Speed Data Logger Module User's Manual(Application))
• When the creation triggers continuously occurred, they may not be detected. For operation when the creation trigger
continuously occurred, refer to the following manual.
(

MELSEC iQ-R High Speed Data Logger Module User's Manual(Application))