User`s manual

9
DEVICE EXPLANATION
9.2 Internal User Devices
9.2.7 Link special relay (SB)
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9
Device Explanation
10
CPU Module Processing Time
11
Procedure for Writing Program to CPU ModuleAppendicesIndex
9.2.7 Link special relay (SB)
(1) Definition
The link special relays show the communication status • error detection of the CC-Link
Safety master module and MELSECNET/H 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 Table9.3.
Remark
Refer to the following manual for the link special relay.
CC-Link Safety Master Module User
's Manual
Q Corresponding MELSECNET/H Network System Reference Manual
(PLC to PLC network)
Table9.3 Number of link special relay points of each CPU module
CPU module Number of link special relay points
Safety CPU
1536 points (SB0 to 5FF).
512 points are assigned to link special relays for the CC-Link
Safety master module and MELSECNET/H module.
The link special relays can be assigned as shown below.
S
B200
S
B3FF
S
B400
S
B5FF
S
B0
S
B1FF
512
points
512
points
512
points
1536
points
For 1st network module
For 2nd network module
For 3rd network module
Link special relay