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8 PROGRAMMING
MELSEC-QnA
Table 8.1 Link special relay list (continued)
Availability
( : available,
: not available )
: not available )
Online
Number Name
Description
Master
station
Local
station
Offline
SB0073
Operation specification
when CPU is down status
when CPU is down status
Indicates specification when CPU is down status by parameter.
OFF : Stop
ON :
ON :
Continue
SB0074
Reserved station specified
status
status
Indicates the reserved station specified status by parameters
(SW0074 to SW0077).
(SW0074 to SW0077).
OFF : No specification
ON :
ON :
Specification
exists
Depending on the refresh timing, this relay may be updated with the
difference of one sequence scan from the update of Reserved
station specified status (SW0074 to SW0077).
difference of one sequence scan from the update of Reserved
station specified status (SW0074 to SW0077).
SB0075
Error invalid station
specified status
specified status
Indicates the error invalid station specified status by parameters
(SW0078 to SW007B).
(SW0078 to SW007B).
OFF : No specification
ON :
ON :
Specification
exists
Depending on the refresh timing, this relay may be updated with the
difference of one sequence scan from the update of Error invalid
station specified status (SW0078 to SW007B).
difference of one sequence scan from the update of Error invalid
station specified status (SW0078 to SW007B).
SB0076 1
Temporary error invalid
station setting information
station setting information
Indicates the setting of yes/no for temporary error invalid station.
OFF : No
ON :
ON :
Yes
Depending on the refresh timing, this relay may be updated with the
difference of one sequence scan from the update of Temporary error
invalid station specified status (SW007C to SW007F).
difference of one sequence scan from the update of Temporary error
invalid station specified status (SW007C to SW007F).
SB0077 Parameter
receive
status
Indicates the parameter receive status from the master station.
OFF : Receive complete
ON : Receive not complete
ON : Receive not complete
SB0078 1
Host station switch
change
change
Detects the setting switch change of the host station during data link.
OFF : Not change
ON :
ON :
Change
SB0080
Other station's data link
status
status
Indicates the communication status of the other stations.
(SW0080 to SW0083).
(SW0080 to SW0083).
OFF : All stations normal
ON : Faulty station exists
ON : Faulty station exists
It takes maximum of six seconds for this relay to turn on after a slave
station connected to the master station or local station becomes
faulty.
station connected to the master station or local station becomes
faulty.
SB0081 1
Other station watchdog
timer error status
timer error status
Indicates the watch dog timer error occurrence status in the other
station (SW0084 to SW0087).
station (SW0084 to SW0087).
OFF : No error
ON :
ON :
Error
Depending on the refresh timing, this relay may be updated with the
difference of one sequence scan from the update of Other station
watchdog timer error occurrence status (SW0084 to SW0087).
difference of one sequence scan from the update of Other station
watchdog timer error occurrence status (SW0084 to SW0087).
SB0082 1
Other station fuse blown
status
status
Indicates the fuse blow occurrence status in the other station
(SW0088 to SW008B).
(SW0088 to SW008B).
OFF : Not blown
ON :
ON :
Blown
Depending on the refresh timing, this relay may be updated with the
difference of one sequence scan from the update of Other station
fuse blown status (SW0088 to SW008B).
difference of one sequence scan from the update of Other station
fuse blown status (SW0088 to SW008B).
SB0083 1
Other station switch
change status
change status
Detects the setting switch change of the other station during data link.
OFF : Not change
ON :
ON :
Change
Depending on the refresh timing, this relay may be updated with the
difference of one sequence scan from the update of Other station
switch change status (SW008C to SW008F).
difference of one sequence scan from the update of Other station
switch change status (SW008C to SW008F).
SB0090
Host line status
Indicates the hot station line status.
OFF : Normal
ON :
ON :
Error
(disconnection)
1: Link special relay added to the function version B or later