Mitsubishi Electric MELSEC L Series User Manual page 92

(2) Precautions
(a) When the time and date of the error is not correctly displayed
(b) When the error code is not correctly displayed
If errors occur frequently, "*HST.LOSS*" may be displayed in the "Error Code" column, instead of an error code.
(c) When no error history is displayed
Check if the "Module Error History Collection (Intelligent Function Module)" is selected in the "PLC RAS"
setting of PLC parameter. This setting is enabled by executing the write to PLC function using GX Works2 and
resetting the head module or powering off and on the system.
If the "Module Error History Collection (Intelligent Function Module)" checkbox is not selected, error history data of intelligent
function modules are not collected.
Clear the checkbox if a higher operation speed is desired for the head module.
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• Check if the master station is connected to the head module. The head module periodically collects time
information from the CPU module on the master station. If the master station is not connected to the head
module, the time and date of errors will not be displayed correctly. (Initial value: 2000/01/01 00:00:00)
• After acquisition of clock information from the master station, if the head module is powered off and on, the
clock will restart from the time of the power off. (The clock pauses during power off.)
Because of this, the displayed time and date of the error occurred during initial processing may be different
from the actual time and date.
Select the
checkbox.
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