Mitsubishi Electric MELSEC Q Series User Manual page 13

Precautions for logging function
Precautions for user screen creating function
A - 11
(1) Logging setting (Refer to Section 6.4.4)
(a) When the logging file storage has been set to the standard ROM, pay
attention to the free user area of the standard ROM or the number of writes
to standard ROM.
(b) E-mail transmission/File transfer requires several to several tens of seconds
depending on the network line and data size.
Depending on the logging setting, the target file may be deleted before e-mail
transmission or file transfer is completed.
Examine the settings, such as the timing, file capacity and number of saved
files to increase the time to file deletion.
(2) High-speed logging
(a) Be sure to create a user-set system area in the program memory of the
control CPU. (Refer to Section 6.3.3 REMARKS.)
(b) A delay may occur in the logging interval depending on the scan time of the
control CPU and the time of access from a peripheral device/intelligent
function module to the programmable controller CPU.
(1) User parts
(a) Be sure to set the must-be-set parameters of the user parts.
Failure to do so will result in an error.
(b) The file names and parameters of the user parts are not case sensitive.
(c) When the contents of a user screen have been changed, delete the
temporary Internet files (cache), and then read the user screen on the Web
browser.
(Refer to Section 6.2.7 (1) for how to delete the temporary Internet files.)
(d) The device value corresponding to the tag component specified in the user
parts parameter must be retained for a time longer than the tag collection
interval and communication time in the sequence program.
(Especially, be careful when accessing the user screen via the Internet.)
When the retention time of the device value is too short, value change may
not be displayed in user parts accurately.
(2) Sample screens
Sample screens for the user parts are available in the /ROM/WWW/USER/
directory of the Web server module.
Delete all sample screen files before starting actual operation. (To prevent write
to the devices using the sample screens)
The sample screens can be restored by initializing the module. (Refer to Section
4.13.)
A - 11