Chapter 19 Label Initialization Function; Initialization Of Labels After Rebuilt All (Reassignment) - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

19
LABEL INITIALIZATION FUNCTION
RnPCPU
RnCPU RnENCPU
(Process)
• When using a SIL2 Process CPU, refer to the following as well.
Page 605 FUNCTIONS
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.
Target label
Standard label Labels outside the latch
range
Latch type labels
Safety label and standard/safety shared label
*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.
19 LABEL INITIALIZATION FUNCTION
322

19.1 Initialization of Labels After Rebuilt All (Reassignment)

RnPCPU RnPSFCPU RnPSFCPU RnSFCPU RnSFCPU
(Redundant) (Standard) (Safety) (Standard)
Label initial value
setting
Set
Not set
Set
Not set
Set
Not set
(Safety)
Label initialization operation
When the CPU module is
powered on
Initial values are set.
*1
Zero clear
Initial values are set.
*1
Zero clear

(No setting)
*1
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

(No setting)
*1
Zero clear