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Appendix 3
The link special relay (SB) is turned on/off depending on various factors during 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 Interfaces) as well as GX Works2.
(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 CPU module.
(
Page 103, Section 7.5)
(3) Ranges turned on/off by users and by the system
The following ranges correspond to when the link special relays (SBs) 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 table in the following pages lists the link special relays (SBs) when they are assigned from SB0000 to
SB01FF.
• 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.
Link Special Relay (SB) List
Page 400, Section 11.3
APPENDICES
A
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Troubleshooting
