Mitsubishi Electric QJ81DL96 User Manual page 350

11
FUNCTIONS OF CONFIGURATION TOOL (MODULE SETTINGS)
11
- 105 11.5 Data Logging Setting
11.5.10 Trigger (single condition)
POINT
Since the determination of the data condition is executed with the data sampled at
the specified data sampling interval, it is not detected if the condition is not
established at the data sampling.
Appendix 12 Sampling Processes of High Speed Data Logger Module
(a) Value changes
The following shows the timing of the trigger occurrences when value change is
specified as the condition.
For a bit device:
The trigger occurs when it changes from ON to OFF and from OFF to ON.
Trigger
Bit device
For a word device:
The trigger occurs with each change of the value.
Trigger
Word device
(b) Fixed cycle
The trigger occurs at the specified interval after power-ON or the settings are
updated. However, the trigger does not occur at the first sampling. When the
specified interval for the fixed cycle and the timing of sampling don't match, the
trigger occurs at the first sampling after the specified fixed cycle interval elapses.
Sampling interval
Specified interval
When the fixed cycle specified interval is shorter than the sampling interval, the
trigger operates at the sampling interval.
70
50
0
First sampling after
Trigger
specified interval
occurs
First sampling after
Trigger
specified interval
occurs