Appendix 2 Link Special Relay (Sb) List - Mitsubishi Electric MELSEC-Q Series User Manual

Appendix 2 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)
(2) Refresh of the link special relay (SB)
(3) Ranges that is turned on/off by users and by the system
(4) Link special relay (SB) list
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.
The link special relay (SB) uses "Transfer SB" of the refresh parameters to refresh the
device of the CPU module. (Refer to Section 7.6.)
The following ranges correspond to when the link special relays (SB) are assigned from
SB0002 to SB01FF.
• Turned on/off by users: SB0002 to SB001F
• Turned on/off by the system: SB0020 to SB01FF
The following table shows the link special relays (SB) when they are assigned from
SB0002 to SB01FF.
POINT
• 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.
Refer to Section 11.3.
Appendix - 8
Appendices