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App - 2
Appendix 1 List of Special Relays (for Link)
APPENDICES
* 1 Used for the MELSECNET data link system only.
103H
(b11)
259
(b11)
M9251 Link halt
OFF: Normal
ON: Halt
•Controlled according to the data link halt status of the host
station.
•Turns ON when data link is not performed on both the forward
and reverse loop lines.
•Automatically turns OFF when data link returns to normal.
•Valid when the data-linking loop line is online.
103H
(b12)
259
(b12)
M9252
*1
Loop test
status
OFF: Not in execution
ON: In execution
•Turns ON while the host station is executing the forward/reverse
loop test.
103H
(b13)
259
(b13)
M9253
Master station
operating
status
OFF: RUN, STEP RUN
ON: STOP, PAUSE
•Controlled according to the system operation status of the
master station.
•Turns ON when the master station is in STOP or PAUSE status.
•Turns OFF when the master station is in RUN or STEP RUN
status.
103H
(b14)
259
(b14)
M9254
Operating
status of local
stations except
host
OFF: RUN, STEP RUN
ON: STOP, PAUSE
•Controlled according to the system operation status of the local
stations except for the host station.
•Turns ON when any local station except for the host station in
the loop is placed in STOP or PAUSE status.
•Does not turn ON even if the host station enters STOP or
PAUSE status.
•Automatically turns OFF when the local stations except for the
host station are placed in RUN or STEP RUN status.(When all
bits in D9248 to D9251 turn OFF, M9254 turns OFF.)
103H
(b15)
259
(b15)
M9255
Errors of local
stations except
host
OFF: Normal
ON: Error
•Controlled according to the error detection status of the local
stations except for the host station.
•Turns ON when any one of the local stations except for the host
station goes down in the loop.
•Automatically turns OFF when the faulty station returns to
normal, or when data link returns to normal by loop line
switching. (When all bits in D9252 to D9255 turn OFF, M9255
turns OFF.)
Table App.1 List of special relays (for link) (Continued)
Buffer
memory
address
(Bit No.)
No. Name Description Details
Hexad
ecimal
Decim
al