Mitsubishi Electric MELSEC iQ-R Series User Manual page 272

No. Name
SB0064 Cyclic data receive
status
SB0065 Loopback status
SB006A PORT1 link-down
status of own station
SB006B PORT2 link-down
status of own station
SB0074 Reserved station
specification status
SB0075 Error invalid station
setting status
SB0077 Parameter reception
status
SB0078 Network topology
setting
SB007B Input data status of
data link faulty station
APPX
270
Appendix 4 List of Link Special Relay (SB)
Description
Shows the receive status in the communication cycle in which the cyclic data
from the slave station is set using "Disconnection Detection Setting" in the
master station.
Off: Cyclic data received
On: Cyclic data not received consecutively
(Conditions)
• Turns on when the cyclic data of one or more slave stations is not received
consecutively.
• Reserved stations and stations that surpass the maximum station number
are ignored.
(Also used in the CLPA conformance test.)
(Updated even if set as an error invalid station.)
(Updated even if set as a reserved station.)
Stores the loopback status. 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 'Data link status of own station' (SB0049) is off,
and 'Network topology setting' (SB0078) is on. When 'Data link status of own
station' (SB0049) is turned on (error), data prior to error is held.
Stores the link-down status of the own station P1 side.
Off: Link-up
On: Link-down
The time until 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, link-up processing is repeated and may increase the time.
(Also used in the CLPA conformance test.)
(Updated even if set as an error invalid station.)
(Updated even if set as a reserved station.)
Stores the link-down status of the own station P2 side.
Off: Link-up
On: Link-down
The time until 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, link-up processing is repeated and may increase the time.
(Also used in the CLPA conformance test.)
(Updated even if set as an error invalid station.)
(Updated even if set as a reserved station.)
Stores the status of reserved station specification by parameter. The station
number of the station set as a reserved station can be checked with
'Reserved station setting status' (SW00C0 to SW00C7).
Off: Not specified
On: Specified
Stores the status of error invalid station setting by parameter. The station
number of the station set as an error invalid station can be checked with 'Error
invalid station setting status' (SW00D0 to SW00D7).
Off: Not specified
On: Specified
Stores the status of parameter reception from the master station.
Off: Reception completed
On: Reception not completed
Stores the setting status of "Network Topology" for the own station (master
operating station).
Off: Line topology, star topology, or coexistence of star and line topologies
On: Ring topology
Stores the setting status of "Data Link Error Station Setting" under "I/O
Maintenance Settings" in "Supplementary Cyclic Settings" of "Application
Settings" for the own station.
Off: Clear
On: Hold
Availability
Master Local station
station
Unicast Multicast
mode mode
  
  
  
  
*1
  
*1
  
  
  
  