Considerations When The Log Output Function Is Used - Mitsubishi Electric MELSEC iQ-R Series User Manual

Precautions
Log_Area (log display area) does not support the new line character in text display objects.
Set only single line text in each text display object.
Ex.
Ex.) Display text is 100 characters, 40 lines and start is from D0 device.
Text display objects that can display 100 characters are arranged as 40 units.
The text display objects that can display 100 characters will be arranged into 40 items. Each register will be assigned
consecutively as D0, D50, D100, D150...D1800, D1850, D1900, and D1950.

Considerations when the log output function is used

• If a large volume of logs are collected in a short interval, the control function performance of the SECS/GEM
communication software may be affected. Fully take this precaution into account when collecting log data during normal
operation.
• If logs are referenced, the control function performance of the SECS/GEM communication software may be affected. It is
recommended to terminate log data collection (turn OFF the output trigger relay) before referencing log data.
• If logs are collected during operation of the SECS/GEM communication software, log collection may fail. In such cases,
collect the logs again.
• Log data is stored on the memory card. See the log on the memory card.
• Log writing occurs at an interval of 10 seconds. Logs are not output just after operation.
• When changing a module time while collecting logs, a log file is newly created. Changing a module time frequently may
cause many log files to be created, and therefore the SECS/GEM communication software may not be able to refer to logs
properly.
Considerations when switching the power ON or OFF
Never switch the power supply of the SECS/GEM communication software pre-installed model module OFF during log output.
Perform one of the following actions before switching OFF the power supply.
• Make sure that the log output bit is OFF.
• Unmount the SD card of the MELSEC iQ-R series SECS/GEM communication software pre-installed model module (by
moving the Mode switch of the MELSEC iQ-R series SECS/GEM communication software pre-installed model module from
the center to SELECT for 3 seconds or more)
• Move the Mode switch of the MELSEC-Q series SECS/GEM communication software pre-installed model module from
RUN to STOP, and then wait 3 seconds or more
To prevent corruption of logs and spooling files, all file writing is stopped.
Furthermore, perform the following actions before switching ON the power supply.
• Return the Mode switch of the MELSEC iQ-R series SECS/GEM communication software pre-installed model module to
the center.
• Return the Mode switch of the MELSEC-Q series SECS/GEM communication software pre-installed model module to RUN.
Operation may be affected because there are limits on file access during start-up.
7 BASIC FUNCTIONS
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7.17 Log Output