Mitsubishi Electric MELSEC-Q00U(J)CPU User Manual page 297

(p) Operations and functions which cannot be performed
Operations and functions which cannot be performed are the same as the ones at backup. (
Section 3.32.1 (5) (i))
(q) Operation behavior of data logging function and sampling trace function
If the data is backed up while the data logging function or sampling trace function is executed and each
function is set as it is started automatically, when the CPU module is shift to RUN after restoration, the data
logging function or sampling trace function is automatically started.
If the restart of each function after restoration is required without the above setting, each operation to start the
data logging function or sampling trace function is required.
(r) Request source of the sampling trace function
If the data is backed up while the sampling trace function is executed and then start/suspend the trace or
execute the trigger, the request is identified as the one from different request source. At that time, an alert
window is displayed, this has no effect on the operation of the sampling trace function.
(s) Sampling trace function
If data are backed up while the sampling trace function is being executed, the restoration destination CPU
module may misunderstand that a request is from a different request source when trace start/suspension or
trigger execution is requested. An alarm message is displayed at this time. However, there is no impact on the
operation of sampling trace function.
(t) Data protected by security functions
Data protected by the following security functions cannot be restored.
• File password 32
If the name of a file in the restoration destination CPU module and the name of a file in backup data are
identical, and a file password has been set to the file, the restoration cannot be performed.
• File access control by security key
If the CPU module is locked, the backup cannot be performed.
(u) Continuation start of the SFC program after restoration
• Restored SFC program will not be executed with a continuation start, but with an initial start.
(v) When data is restored with the setting to restore the special relay and special
register
The CPU module is operated with the values of the backup function setting such as time/day of the week,
day/time setting for the automatic backup, or the upper limit value of the number of backup data set before the
restoration. (The special register except for the values of the backup function setting is overwritten.) To back up
data with the values of the backup function setting set at the backup, set the values again.
(w) Restoration execution during restoration processing
During a restoration processing, the restoration by turning on SM1929 cannot be executed. (The execution will
be ignored.)
CHAPTER 3 FUNCTIONS
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