Mitsubishi Electric MELSEC iQ-R Series - Label Initial Value Reflection Setting

524
31 LABEL INITIALIZATION FUNCTION
31.2 Label Initial Value Reflection Setting
31.2 Label Initial Value Reflection Setting
With the default settings, 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.
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.
*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". ( Page 525 Setting method)
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
*4
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
*3
When the CPU
module is powered
on
When the operating
status of the CPU
module is switched
from STOP to
RUN
*3
Labels outside the
latch range
Set Initial values are set.
*1
Initial values are not set.
(Values do not change.)
Initial values are set. Initial values are set.
Not set Zero clear
*2
Values do not change. Zero clear
*2
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.