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9.2.8 Link special relay (SB)
(1) Definition
The Link special relay (SB) is a relay that indicates various communication status and detected errors of
intelligent function modules such as CC-Link IE controller modules or MELSECNET/H network modules.
Each of this device area is turned on or off according to a factor occurred during data link.
The communication status and errors on the network can be confirmed by monitoring the link special relay (SB).
(2) Number of link special relay points
The points for the link special relay in the CPU module is 2048. (SB0 to SB7FF).
However, the points can be changed in the Device tab of the PLC parameter dialog box. ( Section 9.1)
To an intelligent function module that has a link special relay, such as a CC-Link IE controller module or
MELSECNET/H network module, 512 points are assigned.
Assigning the link special relay as shown in Figure 9.20 allows refresh of the CC-Link link special relay (SB) to the
link special relay (SB) of the CPU module.
Remark
For details of the link special relay, refer to the manual for an intelligent function module that has the link special relay.
Figure 9.20 Points of the link special relay
SB200
SB3FF
SB400
SB5FF
SB600
SB7FF
SB0
SB1FF
Link special relay
SB800
SB9FF
512
points
512
points
512
points
512
points
2560
points
512
points
For 1st network module
For 2nd network module
For 3rd network module
For 4th network module
For 1st CC-Link module