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MELSEC-Q
APPENDICES
Table 2 Link special relay (SB) list (Continued)
No. Name Description
Availability
Control
station
Normal
station
Remote
master
station
Remote I/O
station
Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial
SB0044
(68)
Station setting
(host)
When PLC to PLC network
Indicates the station type set with the parameter of the host's
network module.
Off: Normal station
On: Control station
When remote I/O network
Indicates the station type set with the parameter of the host's
network module.
Off: Remote I/O station or multiplexed remote sub-master
station
On: Remote master station or multiplexed remote master
station
SB0045
(69)
Setting information
(host)
Indicates the switch setting information (including parameter
settings) of the host's network module.
Off: Normal
On: Abnormal setting
SB0046
(70)
Data link operation
designation result
(host)
Indicates the switch setting information (including parameter
settings) of the host's network module.
Off: Normal data linking
On: Operating in debug mode
SB0047
(71)
Baton pass status
(host)
Indicates the host's baton pass status (transient transmission
enabled).
Off: Normal
On: Abnormal
When an error is identified, the cause of the error can be
checked in Baton pass status (host) (SW0047) and Cause of
baton pass interruption (SW0048).
3
SB0048
(72)
Control station status
(host)
When PLC to PLC network
Indicates the host's status.
Off: Normal station
On: Control station (SB0044 is on)
Sub-control station (SB0044 is off)
Remote master station
status (host)
When remote I/O network
Indicate the host status
Off: Remote I/O station
On: SB0044=On Remote master station or multiplexed
remote master station
SB0044=Off Remote I/O station or multiplexed remote
sub-master station
SB0049
(73)
Host data link status
Indicates the host's data link operation status.
Off: Normal
On: Abnormal
When an error is identified, the cause of the error can be
checked in Cause of data link stop (SW0049).
4
SB004A
(74)
Host CPU status (1)
Indicates the host's CPU status.
Off: Normal
On: Minor error occurred
5
SB004B
(75)
Host CPU status (2)
Indicates the host's CPU status.
Off: Normal
On: A serious or fatal error occurred
3
SB004C
(76)
Cyclic transmission start
acknowledgment status
(host)
Indicates the startup acknowledgment status of the cyclic
transmission.
Off: Not acknowledged (SB0000 is off)
On: Start acknowledged (SB0000 is on)
3
SB004D
(77)
Cyclic transmission start
completion status (host)
Indicates the completion status of the cyclic transmission.
Off: Not completed (SB0000 is off)
On: Start completed (SB0000 is on)
3
SB004E
(78)
Cyclic transmission stop
acknowledgment status
(host)
Indicates the stop acknowledgment status of the cyclic
transmission.
Off: Not acknowledged (SB0001 is off)
On: Stop acknowledged (SB0001 is on)
3
SB004F
(79)
Cyclic transmission stop
completion status (host)
Indicates the stop completion status of the cyclic transmission.
Off: Not completed (SB0001 is off)
On: Stop completed (SB0001 is on)
3: Valid only when SB0047 is off. When it turns on (error), the last data are retained.
4: Minor errors are the type of errors that do not affect the CPU operation. (Refer to Section 8.3.3)
5: Serious errors are the type of errors that stop the CPU operation.
Fatal errors are also the type of errors that stop the CPU operation. (Refer to Section 8.3.3)