Mitsubishi Electric MELSEC-Q00U(J)CPU

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(a) Status of special relay and special register
The following figure shows the status of the special relay and special register when the upper limit value of the
number of backup data is set.
The CPU module checks the following at the timing when bit5 (Upper limit status setting for the number of
backup data) of SD910 is turned on, and enables the upper limit value of the number of bakup data.
• A backup function has not been executed yet. (No backup data folder (Backup_CPU) exists in the SD
memory card used.)
• The value set to SD1928 (Upper limit value setting for the number of backup data) is within the specified
range (1 to 100).
(1) The upper limit value of the number of backup data is set (0 to 10).
ON
SM1926
OFF
END
SM1925
SD910(bit5)
010
ON
(1)
SD1928
SD923
END
ON
10
0
END
OFF