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19 LABEL INITIALIZATION FUNCTION
19.1 Initialization of Labels After Rebuilt All (Reassignment)
19 LABEL INITIALIZATION FUNCTION
In the Process CPU and SIL2 Process CPU, 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.
19.1 Initialization of Labels After Rebuilt All
(Reassignment)
In the Process CPU and SIL2 Process CPU, 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) 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.
This function is supported by the Process CPU and SIL2 Process CPU. Before using this function with the
Process CPU, check the versions of the CPU module and engineering tool used. ( Page 1008 Added and
Enhanced Functions)
Label initialization operation
The following table lists the label initialization operations.
*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.
• When using a SIL2 Process CPU, refer to the following as well.
Page 605 FUNCTIONS
Target label Label initial value
setting
Label initialization operation
*3
When the CPU module is
powered on
When the operating status
of the CPU module is
switched from STOP to
RUN
*2
Standard label Labels outside the latch
range
Set Initial values are set. Initial values are set.
Not set Zero clear
*1
Zero clear
*1
Latch type labels Set Initial values are set. Initial values are set.
Not set Zero clear
*1
Zero clear
*1
Safety label and standard/safety shared label Set
(No setting)
(No setting)
Not set Zero clear
*1
Zero clear
*1
RnCPU
RnENCPU
RnPSFCPU RnPSFCPU
RnSFCPU RnSFCPURnPCPURnPCPU
(Standard) (Safety) (Standard) (Safety)
(Redundant)
(Process)
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