Mitsubishi MELSEC-A series, Programming Manual

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APP - 15
APPENDICES
(2) Link special relays only valid when the host is a local station
Table 1.3 Link Special Relay List
Number Name Description Details
M9204
LRDP instruction
complete OFF:Incomplete
ON: Complete On indicates that the LRDP instruction is complete at the
local station.
M9205
LWTP instruction
complete OFF:Incomplete
ON: Complete On indicates that the LWTP instruction is complete at the
local station.
M9211
Link card error
(local station) OFF:Normal
ON: Error Depends on presence or absence of the link card error.
Judged by the CPU.
M9240 Link status
OFF:Online
ON: Offline, station-to-station
test, or self-loopback test
Depends on whether the local station is online or offline, or is
in station-to-station test or self-loopback test mode.
M9241 Forward loop error
OFF:Normal
ON: Error
Depends on the error condition of the forward loop line.
M9242 Reverse loop error
OFF:Normal
ON: Error
Depends on the error condition of the reverse loop line.
M9243 Loopback execution
OFF:Non-executed
ON: Executed Depends on whether or not loopback is occurring at the local
station.
M9246 Data unreceived
OFF:Received
ON: Unreceived Depends on whether or not data has been received from the
master station.
M9247 Data unreceived
OFF:Received
ON: Unreceived Depends on whether or not a tier three station has received
data from its master station in a three-tier system.
M9250 Parameter unreceived
OFF:Received
ON: Unreceived Depends on whether or not link parameters have been
received from the master station.
M9251 Link break
OFF:Normal
ON: Break
Depands on the data link condition at the local station.
M9252 Loop test status
OFF:Unexecuted
ON: Forward or reverse loop
test is being executed
Depends on whether or not the local station is executing a
forward or a reverse loop test.
M9253
Master station
operating status OFF:RUN or STEP RUN mode
ON: STOP or PAUSE mode Depends on whether or not the master station is in STOP or
PAUSE mode.
M9254
Operating status of
other local stations OFF:RUN or STEP RUN mode
ON: STOP or PAUSE mode Depends on whether or not a local station other than the
host is in STOP or PAUSE mode.
M9255
Error status of other
local stations OFF:Normal
ON: Error Depends on whether or not a local station other than the
host is in error.