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Replacement of SD card, and operation procedure at time of failure
Various procedures
● Definition of terms
Two SD devices are built-in to the Intelligent Controller.
Since SD cards of different types (SLC/MLC) are inserted into each device, we will explain based on the following
definition of terms.
Term
Description
Main SD card
A high durability SLC SD card
In normal operation, it is used as the storage location for main data.
Sub SD card
A standard durability MLC SD card
In normal operation, it is used as the backup storage location.
* If the main SD card fails, as an emergency measure you can temporarily
operate the unit by switching the database mode so that the sub SD card is
used as the main SD card (master database). (*1)
SD device 1
It is used as the main SD card device.
SD device 2
It is used as the sub SD card device.
Master database
This is the database mode to set the SD card inserted in SD device 1.
When used as the main SD card, it is a mandatory settings mode.
Replication database
This is the database mode to set the SD card inserted in SD device 2.
When used as the sub SD card, it is a mandatory settings mode.
*1: In temporary operation, insert the sub SD card that was being used in SD device 2 into SD device 1, and
switch to master database mode to operate the unit. In this case, backups will not be made because there is
no SD card inserted in SD device 2, and the unit is operated with one SD card (SD device 1 only). If the SD
card fails under temporary operation, the data cannot be restored. Temporary operation is for temporary use.
Promptly replace the service parts of the main SD card of SD device 1.
*2: The sub SD card is allowed to be used only for temporary operation. Insert the sub SD card in SD device 1
and switch the mode to master database in accordance with the operation procedure.
LAN port
SD device 2: Sub SD card
Replication database (* 2)
USB port (cannot be used)
SD device 1: Main SD card
Master database
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2017/04/06 10:42:47