Mitsubishi Electric IQSS-R-E Reference Manual page 291

■Communication load
When data is backed up or restored, the load of the service processing in the CPU module is temporarily increased.
Consequently, a communication response will be slow and a timeout error may occur in other communications.
To avoid a timeout error, review the value set for "Device/Label Access Service Processing Setting".
[CPU Parameter]  [Service Processing Setting]  [Device/Label Access Service Processing Setting]
■Change of backup folders/data
Do not change a backup folder name, configuration, or saved file.
Otherwise, the data may not be restored properly.
For the backup file capacity, refer to the following section.
Page 368 Backup File Capacity
■When backing up/restoring data in the state where access load to the SD memory card is high
due to the access from another function of the CPU module
Data backup/restoration may fail if it is performed in the state where access load to the SD memory card is high due to the
access from another function of the CPU module. This is because the processing time of the backup/restoration is extended,
and a system error or a timeout error occurs in the device supporting iQSS in the process of data backup/restoration.
In that case, reduce the access load from another function of the CPU module to the SD memory card, then backup/restore
the data again.
■The IP address of devices supporting iQSS is duplicated
When the IP addresses of devices supporting iQSS on the same network with the CPU module are duplicated, the data
backup/restoration cannot be performed properly.
Set the IP addresses of devices supporting iQSS, so as not to duplicate their IP addresses.
■IP address setting when performing data backup in units of module
When performing data backup in units of module, the devices supporting iQSS which have the same IP address as the CPU
module can be backed up.
Set the IP address of the CPU module for the target device supporting iQSS in advance.
The setting procedures are as follows.
1.
Enter the same IP address as the communication target CPU module to the column of "IP Address" in "PLC" in the
"Ethernet Configuration" window.
2.
Perform a reflection of communication setting to Ethernet devices
For some devices supporting iQSS, the IP address of a communication target module cannot be set.
For the devices supporting iQSS to which the IP address of a communication target module cannot be set, the
IP address of the CPU module is set as the IP address of a target module.
■When backing up/restoring data in module unit to/from the device supporting iQSS which is
not supported by data backup/restoration
The device supporting iQSS which does not support data backup/restoration is counted as the number of devices completed
with an error, and an error (C059H) occurs.
• The backup file of the device supporting iQSS whose data backup processing has been completed normally can be used
for data restoration.
• The device supporting iQSS whose data restoration has been completed successfully operates normally.
Results of the data backup and restoration functions can be checked in the event history of an engineering
tool. (Page 366 Event List)
10.5 Backing up/Restoring Data of Devices Supporting iQSS
10
10 Ethernet
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