Mitsubishi Electric MELSEC iQ-R Series User Manual page 40

Recording buffer
A sampled device and label are accumulated in the internal buffer (recording buffer) of a recorder module.
The accumulated data is output to an SD memory card as a recording file when a file saving trigger is satisfied.
The recording buffer capacity can be set for each recording setting, and a period during which data can be saved differs
depending on the capacity. (Page 51 Recording buffer setting)
■When the capacity of accumulated data exceeds the buffer capacity
Data for a set saving period may not be saved.
In this case, perform any of the following operations:
• Reduce the number of devices and labels to be sampled.
• Increase the recording buffer capacity.
• Decrease the saving period.
• Increase the sampling interval.
An operation when the buffer capacity is exceeded differs depending on the recording method as follows:
• When selecting "File Saving Trigger Only" for the recording method
Data is overwritten in chronological order when the buffer capacity is exceeded.
In addition, if the data capacity for a set saving period exceeds the recording buffer capacity, old data in the saving period is
not saved.
(1)
(2)
(a)
(c)
(d)
(e)
(1) File saving trigger
(2) Accumulating data
(3) Time
(a) Saving period before trigger
(b) Saving period after trigger
(c) Period during which data is accumulated in the recording buffer
(d) Period during which data is not saved
(e) Period during which data is actually saved
• When selecting "Recording Startup Trigger + File Saving Trigger" for the recording method
Data accumulation stops when the buffer capacity is exceeded.
In addition, if the data capacity for a set saving period exceeds the recording buffer capacity, new data in the saving period is
not saved.
(1)
(2)
(a)
(b)
(c)
(1) Recording startup trigger
(2) Accumulating data
(3) Time
(a) Set saving period
(b) Period during which data is accumulated in the recording buffer
(c) Period during which data is actually saved
(d) Period during which data is not saved
1 FUNCTIONS
38
1.1 Recording Function
(b)
(3)
(3)
(d)