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MELSEC-Q
APPENDICES
(3) List of link special relay (SB) areas
The following lists the link special relay (SB) areas (SB0000 to SB01FF).
POINT
(1) Do not turn ON the area which does not exist in the list.
Doing so may cause malfunction of the programmable controller system.
(2) For how to use the link special relay (SB), refer to Section 6.6.
Table 2 Link special relay (SB) list
No. Name Description
Availability
Control
station
Normal
station
Remote
master
station
Remote I/O
station
Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial
1 3
SB0000
(0)
Link startup (host)
Restarts the host's cyclic transmission.
Off: Start not instructed
On: Start instructed (valid at rise)
2
1 3
SB0001
(1)
Link stop (host)
Stops the host's cyclic transmission.
Off: Stop not instructed
On: Stop instructed (valid at rise)
2
1 3
SB0002
(2)
System link startup
Restarts the cyclic transmission according to the contents of
SW0000 to SW0004.
Off: Start not instructed
On: Start instructed (valid at rise)
2
1 3
SB0003
(3)
System link stop
Stops the cyclic transmission according to the contents of
SW0000 to SW0004.
Off: Stop not instructed
On: Stop instructed (valid at rise)
2
SB0005
(5)
Clear retry count
Clears the retry count (SW00C8 to SW00C9) to 0.
Off: Clear not instructed
On: Clear instructed (valid when on)
2
1
SB0006
(6)
Clear communication
error count
Clears the communication error (SW00B8 to SW00C7) to 0.
Off: Clear not instructed
On: Clear instructed (valid when on)
2
[Availability column] Optical: optical loop, Coaxial: coaxial bus
: Available, : Not available
1: Used in the network tests of peripheral devices.
2: SB0000 to SB0003 become valid when only one point turns on.
3: Valid only when SB0047 is off. When it turns on (error), the last data are retained.