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MELSEC-Q
APPENDICES
Appendix 3 Link Special Register (SW)
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) When multiple network modules are mounted
Data in the link special register (SW) of each network module are refreshed to
the following link special register (SW) areas of the CPU module when the
refresh parameters of each network module are set to their default.
Module mounting
position
Module 1 Module 2 Module 3 Module 4
Device number SW0000 to 01FF SW0200 to 03FF SW0400 to 05FF SW0600 to 07FF
(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). (The device
numbers are the example when the network module is mounted in the position of
Module 1.)