Logging Function - Mitsubishi Electric MELSEC iQ-R Series User Manual

1.10

Logging Function

This function stores 1000 points of measured temperature values or scaling values per channel in the buffer memory area. In
addition, the data collection can be stopped by using the status change of the data as a trigger. This function also helps the
error analysis since the data before and after the occurrence of an error is held.
Using module function blocks enables saving the data stored in the buffer memory as a CSV file.
Logging function
■Collecting logging data
Logging data is collected as follows.
• For each channel, 1000 points of the latest measured temperature values or scaling values can be always collected.
• For the thermocouple input module, the data can be collected at intervals of 30ms at minimum and of 3600s at maximum.
For the RTD input module, the data can be collected at intervals of 10ms at minimum and of 3600s at maximum.
Measured temperature
value or
scaling value
Logging data are stored in the buffer memory area. When the number of stored data points is 1001 or greater, data is
sequentially overwritten from address 0 with new data.
■Stopping the logging operation
The logging data is refreshed at high speed during logging. Stop logging when the logging data needs to be referred without
paying attention to the refreshing cycle.
Logging can be stopped by the hold trigger.
• A hold trigger allows two options: Logging hold request or Level trigger.
• The number of data points to be collected after a hold trigger occurs can be set.
Logging data are stored
in buffer memory areas.
Address 0
Address 1
Address 2
Address 3
Address 4
Address 5
Address 998
Address 999
■Saving logging data into a CSV file
The data in CH1 Logging data (Un\G10000 to Un\G10999) disappears when the module is powered off. However, the data
can be saved in a CSV file by using module function blocks.
1 FUNCTIONS
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1.10 Logging Function
Address 0
Address 1
Address 2
Address 3
Logging Address 4
Address 5
cycle
Address 998
Address 999
(1)
(2)
(1)
Hold trigger
(2)
(3)
(3)
(1) Head pointer
The address of the oldest data in logging data can be checked.
(2) Latest pointer
The address of the latest data in logging data can be checked.
(1)
(2)
Logging hold request
A hold trigger is generated from a program at any timing.
Level trigger
A hold trigger is generated when a stored value in a buffer memory area is monitored and the
set condition is satisfied as follows.
Example: When the stored value exceeds or falls below the set value, a hold trigger is
generated.
Stored value of a buffer
memory area to be monitored
A trigger is
generated.
Trigger setting
value
Post-trigger logging points
When the set points of data is collected after a hold trigger is generated, the logging operation
is stopped.
A trigger is
generated.
Time