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DL8 USERS
MANUAL EM-7691-B Rev.24
11.3 DATA LOGGING
11.3.1 SPECIFICATIONS
ITEM
DESCRIPTION
Recording medium
SD card (FAT16, FAT32)
File
CSV format (engineering unit value stored)
Character code
Shift JIS
File header (
*
1)
1st row: Blank
2nd row: User defined header 1
3rd row: User defined header 2
4th row: User defined header 3
User defined header: 1024 characters or less per row
Contents per row
(6th and following rows)
1st column: Date/time (year/month/date/hour/minute/second)
2nd and the following columns: Engineering unit data (for channel No.)
Logging cycle
(synchronized with RTC)
Seconds: 1, 2, 5, 10, 20, or 30 seconds
Minutes: 1, 2, 5, 10, 15, 20, or 30 minutes (on the second)
Hours: 0 to 23 hours (multiple selection with time delay (minutes, seconds))
Dateline (
*
3): 0 to 23 hours
Day of week: Sunday to Saturday, multiple selection
Channel
Max. 32 channels (AI, DI, DI (counter), PI, DO, and AO)
Sampling method
(*
2)
Momentary value, average value, peak value (max. or min.)
(Basic sampling rate: 1 second)
File storage
• Folders
Folders to store data files is created under the root directory, each named by year and
month.
e.g. \2013_05
• Files
Logging cycle: seconds
Data is saved at one-minute intervals and data for one day is saved in a file named by
date. e.g. \2013_05\D26.CSV (a file of May 26, 2013)
Logging cycle: minutes
Data is saved in the same cycle as the logging cycle and data for one day is saved in
a file named by date. e.g. \2013_05\D26.CSV (a file of May 26, 2013)
Logging cycle: hours
Data is saved in the same cycle as the logging cycle and data for one month is saved
in a file named by year and month. e.g. \2013_05\M05.CSV (a file of May, 2013)
Data logging can be enabled or disabled by setting.
Error handling
File access error: Logging stopped due to SD card access error
Abnormal disk: Abnormal SD card recognition
Disk-full: Logging stopped due to the SD card memory capacity shortage
Deficient logging: Data deficiency due to the internal buffer overflow
Logging error information in the system log (Refer to 15.2.6 SYSTEM LOG.)
*
1. The DL8 records file headers at the moment when the file is created and data logging is started.
If an identical file name is detected, the file header is added to the tail end of this file.
Data is handled in the similar way when the name is changed by adjusting the clock backwards.
Headers are ignored if there is no header setting.
