As an SD card is used for the logging function, there are risks of loss of data or data damage depending on usage conditions. Consider possible risks, design a system and make an evaluation of the system before using the function.
Precautions when powering off the PLC
If the PLC is powered off during logging or accessing an SD card, the following problems may occur:
Data accumulated in the buffer memory are lost.
Files are damaged.
The SD card is damaged.
To prevent data loss, take the necessary measures such as using an uninterruptible power supply (UPS).
Logging speed and writing speed into an SD card
When data accumulation is faster than writing the data to the SD card, data cannot be saved. Check the duration of each process thoroughly before use.