Checking Method For The Processing Time - Mitsubishi Electric MELSEC iQ-R Series User Manual

Checking method for the processing time

The data logging, event logging, and report functions of a high speed data logger module are best effort functions.
Since processing time of the high speed data logger module changes according to the settings and status of other devices, it
may not operate with the set data sampling interval. Run the system by fully verifying the processing time of each function
when constructing it.
The following figure shows the relationship of the processing from when the high speed data logger module samples the data
from the CPU module up to when it outputs them to a file.
This section shows the check points for processing time related to the processing below.
CPU module
Device
Ò
Processing Description
Sampling process
In the sampling process, data is sampled from the CPU module, and the
sampled data is temporarily stored in the unprocessed buffer (internal memory
of the module).
The sampling process is performed in the specified data sampling interval or by
synchronizing with the sequence scan, but it may not be able to operate in the
specified data sampling interval depending on the amount of data, network
speed, or sequence scan time conditions. (Data will be missed.)
*1
Data logging process Save the data stored in the unprocessed buffer to the data logging file. (If a
trigger and period are set, determine if the conditions have been satisfied in
advance.)
When the data logging process is not in time compared to the data sampling
process speed, a processing overload occurs and data are missed. (The
conditions satisfaction may not be detected during the settings for Trigger and
Period of time.)
*1
Event logging process
Determine if event conditions are satisfied by using the data stored in the
unprocessed buffer. Save the events in the event logging file when the
conditions are satisfied.
When the event logging process is not in time compared with the data sampling
process speed, a processing overload occurs and the event conditions
satisfaction may not be detected.
*1
Report process
Determine the creation trigger establishment by using the data stored in the
unprocessed buffer. Data is output in the data logging file and the data (current
value data) in the unprocessed buffer to an Excel file.
When the report process is not in time compared to the data sampling process
speed, a processing overload occurs and the creation trigger execution may
not be detected.
*1 The data logging process, event logging process, and report process are performed in order. Therefore, if the load is high for any of the
functions, it will affect the other function.
High speed data logger module
Unprocessed buffer
Data
Unprocessed data
Ó
Data logging
Ô
Event logging
Õ
Report
Check point
Check if the
processing to
sample data from
the CPU module is
operating in the
specified data
sampling interval.
Check if the
sampled data are all
being processed.
Reference
Page 350 Checking
sampling process
time
Page 351 Checking
data logging process
time
Page 351 Checking
event logging process
time
Page 351 Checking
report process time
APPX
Appendix 7 Processing Time
A
349