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19 DATA LOGGING FUNCTION
19.5 Details of Specifications
Trigger logging
In trigger logging, the CPU module stores specified data in its internal buffer at a specified collection interval or timing; it
extracts a specified number of data records before and after the satisfaction of a trigger condition and saves the extracted
data in a data logging file residing in the storage memory. Note that data collection is performed not only at the specified
collection interval or timing but also when a trigger condition is met. In addition, once a trigger condition is met, any
subsequent trigger conditions are ignored.
When the data for the number of records specified by the CPU Module Logging Configuration Tool is collected and written to
the storage memory, the collection will be finished.
■To start trigger logging
Start data logging by start operation from the CPU Module Logging Configuration Tool or the special relay
*1
.
■To stop trigger 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 trigger 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 trigger 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)
If data logging is stopped or data collection is suspended before completion of trigger logging and then data logging is
resumed, data collection will be started not from the last logging, but from the initial state before the trigger logging.
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