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19 LABEL INITIALIZATION FUNCTION
19.2 Label Initial Value Reflection Setting
19.2
Label Initial Value Reflection Setting
With the default settings of the Process CPU and SIL2 Process CPU, initial label values are not set in labels when the
operating status of CPU module is switched from STOP to RUN even though the label initial values have been set for the
labels.
This function can set whether or not to set label initial values when the operating status of the CPU module is switched from
STOP to RUN.
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. (
Label initialization operation
The following table lists the label initialization operations.
*1 Since values in labels outside the latch range are cleared when the CPU module is powered off, initial values are set in the labels when
the CPU module is powered on even though "Label Initial Value Reflection Setting" has been set to "Disable".
*2 The labels (whose attributes are other than CONSTANT) to be assigned to label areas are cleared to zero.
*3 This operation is also performed when the operating status of the CPU module is switched from PAUSE to RUN.
*4 Since the labels assigned to devices are assigned to device areas, the labels are not initialized by this function.
Setting procedure
The following describes the procedure of disabling label initial values to be set when the operating status of the CPU module
is switched from STOP to RUN.
1.
Check that "Label Initial Value Reflection Setting" has been set to "Disable". (
2.
Write data to the programmable controller.
3.
Set the CPU module to the RUN state. (Label initial values are not set.
*1
)
*1 Initial values are set when the CPU module is powered on or the operating status of the CPU module is switched from STOP to RUN for
the first time after all data is rebuilt (reassigned) and written to the programmable controller.
Target label
Label initial
value setting
Label initialization operation
When "Label Initial Value Reflection
Setting" has been set to "Disable"
When "Label Initial Value Reflection
Setting" has been set to "Enable"
When the CPU
module is powered
on
When the operating
status of the CPU
module is switched
from STOP to RUN
When the CPU
module is
powered on
When the
operating status
of the CPU
module is
switched from
STOP to RUN
Standard
label
Labels outside
the latch range
Set
Initial values are set.
Initial values are not set.
(Values do not change.)
Initial values are set.
Initial values are set.
Not set
Zero clear
Values do not change.
Zero clear
Values do not change.
Latch type
labels
Set
Initial values are not set.
(Values do not change.)
Initial values are not set.
(Values do not change.)
Initial values are set.
Initial values are set.
Not set
Values do not change.
Values do not change.
Values do not change.
Values do not change.
Safety label and standard/
safety shared label
Set
(No setting)
(No setting)
(No setting)
(No setting)
Not set
Zero clear
Values do not change.
Zero clear
Values do not change.
Summary of Contents for MELSEC iQ-R-R00CPU
Page 2: ......
Page 151: ...9 MONITOR FUNCTION 9 1 Real Time Monitor Function 149 9 MEMO ...
Page 323: ...18 SEQUENCE SCAN SYNCHRONIZATION SAMPLING FUNCTION 321 18 MEMO ...
Page 330: ...328 20 ROUTING SETTING 20 3 Precautions MEMO ...
Page 423: ...26 BASIC CONCEPT 26 8 State Transition of the Redundant System 421 26 MEMO ...
Page 1014: ...1012 APPX Appendix 15 Added and Enhanced Functions MEMO ...
Page 1027: ......