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Appendix 3 Link Special Relay (SB) List
Appendix 3 Link Special Relay (SB) List
The link special relay (SB) is turned on/off depending on various factors at data link. Any error status of the data link
can be confirmed by using and monitoring it in the program.
(1) Application of the link special relay (SB)
By using link special relays (SB), the status of CC-Link IE Field Network can be checked from HMI (Human
Machine Interface) as well as GX Developer.
(2) Refresh of the link special relay (SB)
The link special relay (SB) uses "Transfer SB" of the refresh parameters to refresh the device of the safety CPU
module. ( Page 86, Section 7.5)
(3) Ranges that is turned on/off by users and by the system
The following ranges correspond to when the link special relays (SB) are assigned from SB0000 to SB01FF.
• Turned on/off by users: SB0000 to SB001F
• Turned on/off by the system: SB0020 to SB01FF
(4) Link special relay (SB) list
The following table shows the link special relays (SB) when they are assigned from SB0000 to SB01FF.
• Available link special relays are the same for all safety CPU operation modes.
• Do not turn on or off areas whose numbers are not on the link special relay (SB) list.
Doing so may cause malfunction of the programmable controller system.
• For the usage of the link special relay (SB), refer to the following.
Page 221, Section 11.3