Troubleshooting By Symptom; Troubleshooting On Csv File Output; Troubleshooting On Sd Memory Cards - Mitsubishi Electric MELSEC-L Series User Manual

13.2

Troubleshooting by Symptom

13.2.1

Troubleshooting on CSV file output

The following are examples of incorrect display of CSV file outputs and how to troubleshoot the problems.
Symptom
Time data in the Date column are
incorrect.
The number in the Index column is
reset to 1.
13.2.2

Troubleshooting on SD memory cards

The following are examples of SD memory card problems and corrective actions.
Symptom
When the SD memory card is
installed with the power on and the
SD memory card lock switch is slid
down, the SD memory card LED
does not turn on.
When the SD memory card is
accessed from a peripheral device
such as a personal computer, the
size of the accessed file is 0 byte. Or,
the file is corrupt and not accessible.
152
Cause
Clock data setting was changed
after start of the data logging.
Data missing has occurred.
Cause
The file system on the SD memory
card is corrupt.
Do not change clock data of the CPU module during execution of the data
logging function. ( Page 73, Section 6.8 (12))
To prevent data missing, take any of the following actions.
• Increase the sampling interval. (
• Decrease the number of sampled data. (
• Increase the buffer capacity. (
• Decrease frequency of file switching. (
Power off and then on or reset the module, and diagnose the condition of the SD
memory card. ( Page 138, Section 9.1 (1))
If the problem is not solved by the above action, format the SD memory card.
Action
Page 99, Section 8.4.4)
Page 101, Section 8.4.5)
Page 115, Section 8.5.2)
Page 109, Section 8.4.10)
Action