Mitsubishi Q02CPU

9
DEVICE EXPLANATION
9
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9.2 Internal User Devices
9.2.8 Link special relay (SB)
9.2.8 Link special relay (SB)
(1) Definition
A link special relay indicates the communication status and error detection of an
intelligent function module, such as the MELSECNET/H Network Module.
ON/OFF of the link special relays are controlled by various causes that occur during
data link.
By monitoring the link special relays, the communication status, error status and
others of data link can be grasped.
(2) Number of link special relay points
The number of link special relay points is as described in Table9.5.
Remark
For details of the link special relays, refer to the manual of the intelligent function
module having link special relays.
Table9.5 Number of link special relay points of each CPU module
CPU module Number of link special relay points
Basic model QCPU
1024 points (SB0 to 3FF).
512 points assigned for the intelligent function module having
link special relays, such as the MELSECNET/H network
module.
High Performance model
QCPU
Process CPU
Redundant CPU
2048 points (SB0 to 7FF).
512 points assigned to the intelligent function module having
link special relays, such as the MELSECNET/H network
module.
The link special relays can be assigned as shown below.
SB200
SB3FF
SB400
SB5FF
SB600
SB7FF
SB0
SB1FF
512
points
512
points
512
points
512
points
2048
points
For 1st network module
For 2nd network module
For 3rd network module
For 4th network module
Link special relay