Appendix 4 Link Special Register (Sw) List - Mitsubishi Electric Melsec QJ71LP21 Reference Manual

APPENDICES

Appendix 4 Link Special Register (SW) List

App - 19
In the link special register (SW), the data linking information is stored as numeric
values. Thus, faulty areas and causes of errors can be checked using or monitoring
the link special registers in the sequence programs.
Moreover, the link special register (SW) that stores the link status is used for the
detailed information of the network diagnostics of GX Developer. For a list of the device
numbers for each display item, refer to Section 8.1, "Network Diagnostics (Network
Monitor)" and Section 8.3.1, "How to check error codes".
(1) Mounting multiple network modules
The link special register (SW) of each network module is refreshed by the link
special register (SW) of the CPU module shown below when the refresh
parameters of each network module remain default.
Module installing position
Device number
(2) Range turned ON/OFF by user and range turned ON/OFF by
system
The link special register (SW) has the user setting area range (SW0000 to
SW001F) and the system setting area range (SW0020 to SW01FF). (When the
module is installed in the position of Module 1)
(3) Link special register (SW) list
Assignments of SW0000 to SW01FF are shown in the special register (SW) list.
POINT
(1) Do not write data to the area of the No. which does not exist in the link special
register (SW) list.
Writing data to the area of the No. which does not exist in the list may cause
malfunction of the programmable controller system.
(2) For how to use link special register (SW), refer to Section 6.4.
Module 1 Module 2
SW0000 to 01FF SW0200 to 03FF SW0400 to 05FF SW0600 to 07FF
MELSEC-Q
Module 3 Module 4
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