Link Special Relays And Registers (Sb/Sw); Link Special Relays (Sb) - Mitsubishi MELSEC-Q Series User Manual

8 PROGRAMMING

8.4 Link Special Relays and Registers (SB/SW)

8.4.1 Link special relays (SB)

Number Name
SB0000
Data link restart
(5E0 , b0)
H
Refresh instruction at
SB0001
standby master
(5E0 , b1)
H
switching
SB0002
Data link stop
(5E0 , b2)
H
Refresh instruction
SB0003 when changing
(5E0 , b3) parameters by the
H
dedicated instruction
SB0004 Temporary error
(5E0 , b4) invalid request
H
Temporary error
SB0005
invalid canceling
(5E0 , b5)
H
request
SB0008
Line test request
(5E0 , b8)
H
SB0009 Parameter information
(5E0 , b9) read request
H
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The data link status can be checked with bit data (link special relays: SB) and word
data (link special registers: SW).
The SB and SW represent the information in the buffer memory of the master/local
module, which is used by reading to the device specified in an automatic refresh
parameter.
• Link special relays (SB)
• Link special registers (SW): Buffer memory addresses 600
Link special relays SB0000 to SB003F are turned ON/OFF by the sequence program,
and SB0040 to SB01FF are automatically turned ON/OFF.
The values in parentheses in the number column indicate the buffer memory address.
When the standby master station is controlling the data link, the availability of the link's
special relays is basically identical to that of the master station.
When the standby master station is operating as a local station, the availability of the
link's special relays is identical to that of a local station.
For the correspondence with the buffer memory, see Section 8.3.2 (3).
Table 8.3 Link special relay list (1/5)
Restarts the data link that had been stopped by SB0002.
OFF: Restart not instructed
ON : Restart instructed
Instructs to perform cyclic data refresh after the data link control is
transferred to the standby master station.
OFF: Not instructed
ON : Instructed
Stops the host data link.
However, when the master station executes this, the entire system
will stop.
OFF: No stop instruction
ON : Stop instructed
Instructs to refresh cyclic data after changing parameters by the
RLPASET instruction.
OFF: Not instructed (stop refreshing)
ON : Instructed (start/continue refreshing)
Establishes the stations specified by SW0003 to SW0007 as
temporary error invalid stations.
OFF: Not requested
ON : Requested
Cancels the temporary error invalid status of stations specified by
SW0003 to SW0007.
OFF: Not requested
ON : Requested
Executes line tests for the stations specified by SW0008.
OFF: Not requested
ON : Requested
Reads the parameter setting information for the actual system
configuration.
OFF: Normal
ON : Abnormal
: Buffer memory addresses 5E0
Description
MELSEC-Q
to 5FF
H H
to 7FF
H H
Availability
( : Available, : Not available)
Online
Master station Local station
Offline
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