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3.31.1 Data backup for the CPU module change function
This function backs up all the data (only the file register files and latch-target device data) in a CPU module to a
memory card or SD memory card. If a memory card or SD memory card is used in a running system, users can stop its
operation, change the card, and back up data to another card.
(1) Data backup using contacts
(a) Setting method
To back up data using contacts, turn on the devices set in the PLC Module Change Setting window, opened by
clicking the button on the PLC system tab of the PLC parameter dialog box.
*1 The CPU module enters the STOP status at the rise of the backup start setup contact, the backup start contact cannot
be turned on in the sequence program.
*2 Set different devices for the backup start setup contact and backup start contact.
*3 These are the setting range for the default number of points. The setting range will be M (0 to 61439) and B (0 to 0EFFF)
when the number of internal user device points is set to the maximum, 60K points.
*4 If no backup target data is selected, only device data and system data are backed up.
*5 A title is used to identify backup data. The title of the backup data stored in a memory card or SD memory card can be
checked on the window opened by selecting [Delete PLC Data] from the menu using a programming tool.
Item Description Setting range Default
Backup Start Setup
Contact
*1
At the rise of the selected device among the items shown
in the right column, backup is ready to start.
Available devices
*2
• X (0 to 1FFF)
• M (0 to 8191)
*3
• B (0 to 1FFF)
*3
-
Backup Start Contact
At the rise of the selected device among the items shown
in the right column, backup enters execution status.
Backup Target Data
Select data to be backed up stored in any of memories
shown in right column.
*4
• Program memory (drive 0)
• Standard RAM (drive 3)
• Standard ROM (drive 4)
All drives are backed up.
Format memory card
before backup
Select whether to format a memory card before backup.
Formatted
Selected/deselected
Deselected
Title Setting
*5
Set a title for a backup data file stored in a memory card
or SD memory card.
32 characters (16 in two-byte
characters)
A title based on the time of backup
is set.
(Example) If data are backed up at
12 p.m. on October 1, 2008,
"200810011200" is set.
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