Appendix 4 Link Special Relay (Sb) List - Mitsubishi Electric MELSEC-L SSCNETIII/H User Manual

Appendix 4
The link special relay (SB) is turned on/off depending on various factors occurred in data link. Any error status of the
data link can be confirmed by monitoring it.
(1) Areas turned on/off by the system and a user
• Areas turned on/off by the system: SB0000 to SB0005, SB0007 to SB1FFF
• Area turned on/off by a user: SB0006
(2) Link special relay (SB) list
The following lists link special relays (SB).
Do not turn on/off an area whose number is not on the link special relay (SB) list. Doing so may cause malfunction of the
programmable controller system.
No. Name
Clear of number of
SB0006
communication errors
Mode switch information
SB0043
(own station)
SB0049 Data link status (own station)
SB004A Own station status (1)
SB004B Own station status (2)
SB004C RUN status (own station)
Error frame reception status
SB006C
on CNA (own station)
Error frame reception status
SB006D
on CNB (own station)
Error frame reception
SB006E detection status on CNA
(latch)
Error frame reception
SB006F detection status on CNB
(latch)
Link Special Relay (SB) List
Clears the number of communication errors.
OFF: No clear
ON: Clear (While it is on, new errors are not counted but cleared.)
Stores the mode switch information of own station.
OFF: Online
ON: Other than online
Stores the data link status of own station. (After the refresh is completed, the status is indicated.)
OFF: Data link in progress
ON: Data link stopped
Stores the self-diagnostics results of own station.
The result is used on the network when a request from other stations is accepted.
OFF: Normal
ON: Minor error occurred
Stores the self-diagnostics results of own station.
The result is used on the network when a request from other stations is accepted.
OFF: Normal
ON: Moderate or major error occurred
Stores the RUN status of own station.
OFF: RUN
ON: STOP, ERROR
Stores the current occurrence status of a frame receiving error on CNA of own station.
OFF: No frame receiving error
ON: Frame receiving error occurred
Stores the current occurrence status of a frame receiving error on CNB of own station.
OFF: No frame receiving error
ON: Frame receiving error occurred
Indicates whether or not a frame receiving error has ever occurred on CNA of own station since the power was
on.
OFF: No frame receiving error
ON: Frame receiving error occurred
Indicates whether or not a frame receiving error has ever occurred on CNB of own station since the power was
on.
OFF: No frame receiving error
ON: Frame receiving error occurred
Description
APPENDICES
A
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