19 DATA LOGGING FUNCTION
19.5 Details of Specifications
167
19
Special relay and special register used by the data logging function
For details on the special relays and special registers used by the data logging function, refer to the following:
• Special relay: Special relay related to the data logging function (Page 690 Data logging function)
• Special register: Special register related with the data logging function (Page 729 Data logging function)
19.5 Details of Specifications
Logging type
The following table describes available methods of data collection.
Continuous logging
In continuous logging, the CPU module stores specified data in its internal buffer at a specified collection interval or timing
and, at the time of a file save operation, it saves the data in a data logging file residing in the storage memory. The timing of a
file save operation and the number of saved files can be specified using "File switching timing" and "Number of files to be
saved" in the CPU Module Logging Configuration Tool.
To save a data logging file by specifying "File switching timing", even if a data logging file after file switching is not saved, the
previously saved data logging file can be read.
If the "Stop" has been set for "Operation when exceeds the number of files" on the setting screen of the CPU Module Logging
Configuration Tool, the collection will be finished when the number of saved files reaches the set "number of files to be saved".
■To start continuous logging
Start data logging by start operation from the CPU Module Logging Configuration Tool or the special relay
*1
.
■To stop continuous logging
The user can clear the data logging setting registration stored in the CPU module and completely stop the data logging by
stopping the data logging from CPU Module Logging Configuration Tool or special relay
*1
. (The special relay (data logging
start) turns off.)
*1 This setting is valid only when the data logging setting file is written in the SD memory card. (Page 166 Data Logging Execution by
Special Relay)
■To suspend/resume continuous logging
The user can suspend data logging with the data logging settings remaining intact by doing either of the following:
• Instruct the CPU Module Logging Configuration Tool or special relay
*1
to suspend data logging (the special relay (data
logging start) turns off).
• Turn off to on the special relay (Data logging suspend/resume flag).
To resume continuous logging from suspension, do either of the following:
• Instruct the CPU Module Logging Configuration Tool or special relay
*1
to resume data logging (the special relay (data
logging start) turns on).
• Turn on to off the special relay (Data logging suspend/resume flag).
*1 This setting is valid only when the data logging setting file is written in the SD memory card. (Page 166 Data Logging Execution by
Special Relay)
Logging type Data collection method Application
Continuous logging Continuously collects specified data at specified interval or timing. Allows the user to continuously record specified data for a certain
period of time and check such data in any timing.
Trigger logging Collects specified data at specified interval or timing and extracts a
specified number of data records before and after the satisfaction
of a trigger condition.
Allows the user to monitor the content of specified data before and
after the satisfaction of a trigger condition. For example, by setting
the device for error occurrence as a trigger, logging data before
and after error occurrence can be checked.
To Next Page
Loading...
