Mitsubishi Electric MELSEC iQ-R Series User Manual page 282

*1 The execution of another function includes:
 Execution of data logging with the same trigger conditions (trigger conditions = the specified conditions)
 Auto logging
 Online change
■Data logging states at system switching
The following table lists the data logging states that change at system switching.
• When the control system is switched to the standby system
Before system switching (old control system)
Start waiting (no collection)
Pause
Condition waiting (no collection)
Collecting
Trigger waiting (Collecting before trigger)
Collecting after trigger
• When the standby system is switched to the control system
Before system switching (old standby system)
Standby system start waiting
Standby system pause
Standby system no collection
Before using the data logging function, check if the SD memory card inserted in the CPU module of the
standby system has sufficient free space with a program. When the SD memory card inserted in the CPU
module of the standby system does not have sufficient free space and the systems are switched, an error
occurs at the data collection in the new control system and the data collection is finished.
To prevent occurrence of an error, use a program that turns on the annunciator when the free space of the SD
memory card of the standby system is smaller than the value of the criteria, such as the one shown below.
• For the above program, set "Both Systems Executions" for "Both Systems Program Executions Setting" of
the CPU parameter. ( Page 418 Program Execution in Both Systems)
• Set the value of the criteria in D0 in increments of K of the double word [unsigned].
20 DATA LOGGING FUNCTION
280
20.7 States of the Data Logging Function
After system switching (new standby system)
Standby system start waiting
Standby system pause
Standby system no collection
After system switching (new control system)
Start waiting (no collection)
Pause
Condition waiting (no collection)