Appendices; Appendix 1 Module Label - Mitsubishi Electric MELSEC iQ-R Series User Manual

APPENDICES

Appendix 1
The link special relay (SB) and link special register (SW) of the RJ71LP21-25 can be set using module label.
Structure of the module label
The module label name is defined with the following structure.
"Instance name"_"Module number"."Label name"
"Instance name"_"Module number"."Label name"_D
Ex.
LP21_1.bDetect_DataLinkError
■Instance name
The following is the instance name of the RJ71LP21-25.
Module model name
RJ71LP21-25
■Module number
A sequential number starting with "1" for identifying a module from the one with the same instance name.
■Label name
A label name unique to the module.
■_D
This symbol indicates that the module label is for direct access. The label without "_D" is for link refresh. The following are the
differences between link refresh and direct access.
Type
Link refresh
Direct access
When multiple RJ71LP21-25 modules of the same network number are mounted and the module labels of link
special relay (SB) and link special register (SW) is used for direct access, the access target is the module
which has the smallest slot number in the base unit.
APPX
142

Appendix 1 Module Label

Module Label
Description
The values read/written from/to the module labels are reflected to the module at link
refresh. The execution time of the program can be shortened.
The values read/written from/to the module labels are reflected to the module
immediately. Although the execution time of the program is longer than the one at the
link refresh, the responsiveness is improved.
Instance name
LP21
Access timing
At link refresh
At writing to or reading from the module label