Mitsubishi Electric MELSEC iQ-R Series Configuration Manual page 94

Precautions
If the system is powered off, the CPU module is reset, or the SD memory card is removed while the SD memory card is being
accessed as below, data in the SD memory card may corrupt.
• Data in the buffer memory is being saved to the SD memory card. (Data logging function is being executed.)
• During the folder delete by "User Data Operation" in the engineering tool
In the above case, the SD memory card diagnostics such as the file system check and restoration) is performed at powering
off the system or the reset clear.
Note that the data may be not restored because of the file system status.
The following time is required to diagnose the SD memory card (assuming that 10000 files (100K bytes) are stored in the SD
memory card and file system fragmentation has not occurred).
• NZ1MEM-2GBSD: approximately 7 seconds, NZ1MEM-4GBSD: approximately 8 seconds, NZ1MEM-8GBSD:
approximately 9 seconds, NZ1MEM-16GBSD: approximately 10 seconds
*1 The more number of files are or the more files are fragmented in the SD memory card, the more time is required for diagnostics, and it
may take several minutes in some cases.
*2 When the CPU module is in connection with an external device, running the CPU module and the external device simultaneously can
cause communication time-out on the external device side.
4 SPECIFICATIONS
92
4.4 Performance Specifications of SD Memory Card
*1*2