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APPX
Appendix 4 List of Link Special Relay (SB)
SB005F Reserved station setting enable
completion status
Stores the temporary cancellation processing status for reserved
station specification, which is requested with 'Reserved station
specification enable request' (SB0013).
Off: Not completed (SB0013, SB005E are off.)
On: Completed successfully or ended with an error (SB0013,
SB005E are on.)
(Master
operating station
only)
SB0060 Constant link scan status Stores the operation status of link scan mode.
Off: Link scan mode is not set to constant link scan
On: Link scan mode is set to constant link scan
(Conditions)
• This relay is enabled when 'Baton pass status of own station'
(SB0047) is off.
• When 'Baton pass status of own station' (SB0047) is turned on,
data prior to error is held.
SB0065 Loopback status Stores the loopback status for the loopback function. The station
number of the loopback station can be checked with 'Loopback
station number 1' (SW0070) and 'Loopback station number 2'
(SW0071).
Off: Normal (no loopback stations)
On: Loopback being performed
(Conditions)
• This relay is enabled when 'Baton pass status of own station'
(SB0047) is off, or 'Network topology setting' (SB0078) is on.
• When 'Baton pass status of own station' (SB0047) is turned on,
data prior to error is held.
(Master
operating station
only)
SB0066 Forced master switching enable
status
Stores whether SB0019 is executable.
Off: Not executable
On: Executable
(Submaster
station only)
SB0067 Forced master switching
acceptance status
Stores the acceptance status of SB0019.
Off: Not accepted (SB0019 is off.)
On: Accepted (SB0019 is on.)
(Submaster
station only)
SB0068 Forced master switching operation
status
Stores the status of forced master switch processing requested with
'Forced master switching command' (SB0019).
Off: Not completed (SB0019, SB0067 are off.)
On: Completed successfully or ended with an error (SB0019,
SB0067 are on.)
(Submaster
station only)
SB006A PORT1 link-down status of own
station
Stores the link down status of the own station P1 side.
Off: Link-up
On: Link-down
The time that link-up starts after power-on or Ethernet cable
connection may vary. Normally link-up takes several seconds.
Depending on device status on the line, a link-up processing is
repeated, resulting in the increase in the time.
SB006B PORT2 link-down status of own
station
Stores the link down status of the own station P2 side.
Off: Link-up
On: Link-down
The time that link-up starts after power-on or Ethernet cable
connection may vary. Normally link-up takes several seconds.
Depending on device status on the line, a link-up processing is
repeated, resulting in the increase in the time.
SB006C PORT1 current error frame
reception status of own station (1)
Stores if a receive frame error line status caution level is currently
occurring in the P1 side of the own station.
Off: A receive frame error line status caution level is not occurring.
On: A receive frame error line status caution level is occurring.
SB006D PORT2 current error frame
reception status of own station (1)
Stores if a receive frame error line status caution level is currently
occurring in the P2 side of the own station.
Off: A receive frame error line status caution level is not occurring.
On: A receive frame error line status caution level is occurring.
SB006E PORT1 error frame reception
detection status of own station
(latch) (1)
Stores if a receive frame error line status caution level has occurred
in the P1 side of the own station from power-on until the present.
Off: A receive frame error line status caution level has not yet
occurred.
On: A receive frame error line status caution level has occurred.
No. Name Description Availability
Master station
(submaster
station)
Local station
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