Mitsubishi MELSEC Q series User Manual page 23

(2) Control data can be logged without missing a change (continuous logging).
Data logging is available every scan or on the millisecond time scale. Since changes in the specified control data
can be logged, the data logging function is effective to identify the cause of a problem. Also, logging is performed
at a high speed so that equipment can be analyzed with high accuracy.
When sampling data at intervals of 1ms
1ms
Slight changes in data
are caught.
Data logging is the best-effort type
processing time may vary depending on the configuration or the other connected devices. After configuring the system,
thoroughly examine the processing time before starting the system operation. ( Page 161, CHAPTER 10)
*1 The concept of obtaining the maximum performance from the condition at the time.
(3) Problem analysis can be speeded up. (Trigger logging)
The states and changes in data can be stored as the data before and after a trigger. Since only the data before
and after occurrence of each problem can be stored, the cause of the problem can be identified quickly, and file
space can be saved.
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*1
function. Logging may not be performed at a specified sampling interval because
18 356 39
150
200 18 330 39
250 19 280 39
300 18 310 42
350 18 300 43
285 46
400 19
290 47
450 18
500 15 310 48
550 12 312 49
600 11 333 50
650 5 340 50
51
700 3 352
750 12 360 51
800 14 362 50
850 17 363 50
900 18 363 50
950 19 365 49
0 18 370 49
CHAPTER 1 DATA LOGGING
Data before trigger
Trigger occurred
Data after trigger
1
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