Mitsubishi Electric MELSEC-Q00U(J)CPU User Manual page 284

(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).
282
(1)
ON
SD910(bit5)
SD1928 0
OFF
SM1926
SD923
0
OFF
SM1925
10
ON
10
ON
END END END