Chapter 31 Label Initialization Function; Initialization Of Labels After Rebuilt All (Reassignment) - Mitsubishi Electric MELSEC iQ-R Series User Manual

31
LABEL INITIALIZATION FUNCTION
The labels assigned to label areas will be initialized (Initial values are set if the values have been set, or the labels are cleared
to zero if not) when the CPU module is powered off and on or the operating status of the CPU module is switched from STOP
to RUN after data is rebuilt (reassigned) and then written to the programmable controller.
31.1
Initialization of Labels After Rebuilt All
(Reassignment)
All the labels assigned to the label area will be initialized (initial values are set if the values have been set, or the labels are
cleared to zero if not) when the CPU module is powered off and on or the operating status of the CPU module is switched
from STOP to RUN after data is rebuilt (reassigned) with the engineering tool and then written to the programmable controller.
Labels are initialized only when the data is written to the programmable controller for the first time after data is
rebuilt (reassigned). Thus, to write the same project to the other CPU module, rebuild (reassign) the data
again.
When using this function, check the versions of the CPU module and engineering tool used. ( Page 747
Added and Enhanced Functions)
Label initialization operation
The following table lists the label initialization operations.
Target label
Labels outside the latch range
Latch type labels
*1 The labels (whose attributes are other than CONSTANT) to be assigned to label areas are cleared to zero.
*2 This operation is also performed when the operating status of the CPU module is switched from PAUSE to RUN.
*3 Since the labels assigned to devices are assigned to device areas, the labels are not initialized by this function.
31 LABEL INITIALIZATION FUNCTION
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31.1 Initialization of Labels After Rebuilt All (Reassignment)

Label initial value Label initialization operation
setting
When the CPU module is
powered on
Set Initial values are set.
Not set Zero clear
Set Initial values are set.
Not set Zero clear
*3
When the operating status
of the CPU module is
switched from STOP to
*2
RUN
Initial values are set.
*1
Zero clear
Initial values are set.
*1
Zero clear
*1
*1