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To use the link device in the network module exceeding link relay points of the CPU module (default: 8192 points), change
the link relay points in the Device tab of the PLC Parameter dialog box.
4.2.8
Link special relay (SB)
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 module or MELSECNET/H module.
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).
(1) 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. (
Appendix 1.2.8) To an intelligent function module that has a link special relay, such as a CC-Link IE module or
MELSECNET/H module, 512 points are assigned. Assigning the link special relay as shown in below allows
refresh of the CC-Link link special relay (SB) to the link special relay (SB) of the CPU module.
For details of the link special relay, refer to the manual for an intelligent function module that has the link special
relay.
Link special relay
SB0
For 1st network module
SB1FF
SB200
For 2nd network module
SB3FF
SB400
For 3rd network module
SB5FF
SB600
For 4th network module
SB7FF
SB800
For 1st CC-Link module
SB9FF
512
points
512
points
512
2560
points
points
512
points
512
points
CHAPTER 4 DEVICES
4
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357
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