Mitsubishi Electric MELSEC iQ-R Series User Manual page 36

Data changes occurred between the data sampling processes are not sampled because the high speed data
logger module samples the data only at the specified sampling interval from CPU module.
Therefore, even if the multiple count conditions are satisfied between the data sampling processes, the
satisfaction of a count condition is judged only at the time of data sampling.
When the count condition is not satisfied at the time of data sampling, the values of the number of times and
the time will not updated.
The maximum count value of the number of times and the time will be 4294967295. If the value exceeds
4294967295, the count value will be fixed to 4294967295.
• For number of times
When the count condition is satisfied at the time of data sampling, the count value is increased by adding '1'.
The actual bit data in the CPU
Data sampled by high speed
• For time
The count time depends on the sampling interval. Even if the count condition is not always satisfied between
the data sampling processes and when the count condition is satisfied at the time of data sampling, the time
for the sampling interval is added to the count time. Therefore, the actual time when the counting condition
has held true may differ from the time to be output to the file.
The condition holds true immediately after the previous sampling
The actual bit data in the CPU
Data sampled by high speed
The condition holds true immediately before the sampling
The actual bit data in the CPU
Data sampled by high speed
1 FUNCTION
34
1.1 Data Logging Function
module
Sampling
data logger module
0
Count value
module
Sampling
data logger module
0.0
Time
Count time 0
module
Sampling
data logger module
0.0
Time
0
Count time
4 times ON between sampling
processes.
The condition state is detected as 'true',
only at the time of data sampling. (Count
value is calculated by adding 1)
Sampling
The 'true' conditions between
2 samplings are not counted
1
Sampling
1.0
(seconds)
1
The time of 'true' conditions
between 2 samplings is not
considered. (The output of both
sampling processes is 1)
Sampling
1.0
(seconds)
1