Mitsubishi Electric MELSEC iQ-R Series User Manual page 114

■Label name
The label name unique to the module
■_D
Describes that the module label is for the direct access. When _D is not described, the module label is for the auto refresh.
The following table shows the differences between the auto refresh and direct access.
Type
Auto refresh
Direct access
APPENDICES
112
Appendix 1 Module Label
Description
Reading/writing from/to the module label is reflected to the D/A
converter module at the auto refresh in a batch. The run time of
the program can be reduced. To use the auto refresh, set
"Target" to the module label in "Refresh setting" of "Module
parameter".
Reading/writing from/to the module label is immediately reflected
to the D/A converter module. Compared with the auto refresh, the
run time of the program becomes longer. However, the
responsiveness is high.
Access timing Example
At auto refresh R60DA_1.stnControl[0].wDigit
alValue
At reading/writing from/to the R60DA_1.stnControl_D[0].wD
module label igitalValue_D