Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 65

■Checking logging data without stopping the logging operation
Logging data can be checked during the logging operation with 'CH1 Head pointer' (Un\G434), 'CH1 Latest pointer'
(Un\G435), and 'CH1 Number of logging data' (Un\G436).
To check logging data during logging operation, follow the precautions below because logging data may be refreshed while
data is being read out.
• Set the cycle to 'CH1 Logging cycle setting value' (Un\G537) so that data checking and reading surely complete before
logging data is refreshed. If the logging cycle is short, logging data may be refreshed during data checking and reading.
• After obtaining the logging data which needs to be checked, monitor the variation of the head pointer and the number of
logging data, and obtain logging data just after the stored value has changed.
• If the data refreshed and the data being checked do not synchronize due to the relationship between the logging cycle and
the scan time of the CPU module, adjust the logging cycle.
Stop the logging operation when the logging data needs to be checked without paying attention to the logging cycle. (
Page 64 Stopping the Logging Operation)
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1 FX5-4AD
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1.4 Functions