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Appendix 4 Link Special Register (SW) List
The link special register (SW) stores the information during data link as a numerical value. Error locations and causes
can be checked by the using and monitoring the link special register (SW) in programs.
(1) Application of link special registers (SW)
By using link special registers (SW), the status of CC-Link IE Field Network can be checked from HMI (Human
Machine Interfaces) as well as GX Developer.
(2) Link special register (SW) refresh
The link special register (SW) uses "Transfer SW" of the refresh parameters to refresh the device of the safety
CPU module. ( Page 86, Section 7.5)
(3) Ranges to which data are stored by users and by the system
The following ranges correspond to when the link special registers (SW) are assigned from SW0000 to SW01FF.
• Stored by users: SW0000 to SW001F
• Stored by the system: SW0020 to SW01FF
(4) Link special register (SW) list
The following table shows the link special registers (SW) when they are assigned from SW0000 to SW01FF.
• Available link special registers are the same for all safety CPU operation modes.
• Do not write any data to an area whose number is not on the link special register (SW) list. Doing so may cause
malfunction of the programmable controller system.
• For the usage of the link special register (SW), refer to Page 221, Section 11.3.