19 DATA LOGGING FUNCTION
19.14 Precautions to Take When Using the Data Logging Function
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19.14 Precautions to Take When Using the Data Logging
Function
This section describes precautions to take when using the data logging function.
Mutual exclusion of the data logging function
This section describes the mutual exclusion of the data logging function.
■When another function is executed during the execution of the data logging function
The following table lists the cases when another function is executed during the execution of the data logging function.
■When the data logging function is executed during the execution of another function
The following table lists the cases when the data logging function is executed during the execution of another function.
Locations from which data logging can be performed
Data logging cannot be performed from multiple locations to the same setting number. The CPU module supports data
logging performed concurrently at a maximum of 4 locations assigned to setting numbers 1 to 4.
Retention and clearance of data logging settings
The data logging settings registered in the CPU module are latched and thus survive across a power cycle (power off and on)
or reset of the CPU module in normal cases. In the following cases, however, the data logging status is cleared to the
unregistered state and therefore the setting data must be written again:
• The CPU module is turned off and on or reset without an SD memory card that contains the data logging setting file.
• The replaced SD memory card does not contain the data logging setting file and the CPU module is turned off and on or
reset.
*1
*1 If the data logging setting file contained in the replacement (new) SD memory card is different from that contained in the replaced (old)
SD memory card, the data logging setting file contained in the replacement SD memory card becomes registered.
Operation that occurs when trigger logging is resumed
If data logging is stopped or collection is suspended before the completion of trigger logging and subsequently data logging is
run again, data collection begins from the initial state before trigger logging, rather than continuing from the last time.
Function that has been
already executed
Function to be
executed later
Operation
Data logging function Data logging function When the data logging is started using the CPU Module Logging Configuration Tool to the
same data logging setting number, the data logging to be executed later cannot be executed.
However, the data logging to be executed later can be executed to a data logging setting
number different from the data logging setting number currently being executed.
For the execution of multiple data loggings, the data logging settings stored in different target
memory areas cannot be executed at the same time.
Memory dump function The data logging function and memory dump function cannot be used simultaneously.
Data backup function The data backup function cannot be executed while a logging setting file is being written/
deleted or a logging setting is being registered/cleared.
Data restoration function The data restoration function cannot be executed while a logging setting file is being written/
read/deleted or a logging setting is being registered/cleared.
Function that has been
already executed
Function to be
executed later
Operation
Memory dump function Data logging function The data logging function and memory dump function cannot be used simultaneously.
Data backup function While the data backup function is being executed, a logging setting file cannot be written/
deleted and a logging setting cannot be registered/cleared.
Data restoration function While the data restoration function is being executed, a logging setting file cannot be written/
read/deleted and a logging setting cannot be registered/cleared.
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