Sd Memory Card Life When The Data Logging Function Is Used - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

Operations after SD memory card replacement
If the SD memory card was replaced while data logging was running based on the data logging setting file contained in the SD
memory card, the data logging setting file contained in the new SD memory card is used when data logging is started by one
of the following operations. If the new SD memory card does not contain the data logging setting file, data logging is not
started.
• STOP to RUN state
• Power-on to RUN state
• RESET to RUN state
• Data logging start
Stack file remaining in the replaced SD memory card
Replacing an SD memory card that contains a stack file may result in the storage file remaining in the replaced SD memory
card along with storage files. If the stack file is remaining in the replaced SD memory card, recover the latest data contained in
the stack file by doing the following:
• Retrieve the data from the stack file and combine the data with a storage file.
• Save the stack file as a storage file.
11.13
SD Memory Card Life When the Data Logging
Function Is Used
An SD memory card has a life (restriction on writing data). The following shows the calculation method of an SD memory card
life when the data logging function is used. Note that the actual life of the card varies depending on the use conditions and
environment. Therefore, use the calculated life as a rough standard for the replacement of the card.
Calculation formula of SD memory card life
SD memory card life (year) = Total size of data that can be written (G bytes)  Size of data to be written per year (G bytes/
year)
Total size of data that can be written
Capacity  Number of writes
*1 For the capacity of applicable SD memory cards and the number of writes, refer to the following.
 MELSEC iQ-R Module Configuration Manual
Size of data to be written per year
The size of data to be written per year is obtained by the following formula.
Size of data to be written per year (G bytes/year) = ((DS1
*1
DCN1 +  + (DCSn + 6144)  DCNn)  1073741824
*1 Round up DSn and DCSn to a multiple of 512.
DSn, DNn, DCSn, and DCNn are obtained as follows.
■Data logging data size per record (DSn)
Binary file output format: Refer to the data. ( Page 955 Binary file output format)
Unicode text file format: Refer to the data row. ( Page 950 Unicode text file output type)
■Number of records for data logging per year (DNn)
Continuous logging: DNn = 60  60  24  365  Collection interval and timing (seconds)
Trigger logging: DNn = Total number of records
*1 The value that is determined depending on the condition set in "Sampling" when "Continuous logging" is selected for the logging type.
(When the value is determined in milliseconds, convert the value into seconds.)
*2 Calculate the ratio using the operating time per year of the CPU module. For example, if the operating time per year is 5000 hours, the
operating rate is calculated as follows: 5000  (24  365) = 0.57.
*3 The value set in "Number of logging lines" when "Trigger logging" is selected for the logging type.
*1
*3

11.13 SD Memory Card Life When the Data Logging Function Is Used

*1
+ 6144)  DN1 +  + (DSn
*1 *1
+ 6144)  DNn + (DCS1
*1 *2
 Operating rate
11 DATA LOGGING FUNCTION
11
+ 6144) 
207