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MELSEC-Q
11 TROUBLESHOOTING
Special Relay List (Continued)
ACPU
Special
Relay
Special
Relay after
Conversion
Special
Relay for
Modification
Name
Meaning
Details
Applicable
CPU
M9233 SM1233
Local station
error detect
status
OFF : No errors
ON : Error detection
Depends on whether or not a local station has detected an
error in another station.
M9235 SM1235
Local station,
remote I/O
station parameter
error detect
status
OFF : No errors
ON : Error detection
Depends on whether or not a local or a remote I/O station
has detected any link parameter error in the master station
M9236 SM1236
Local station,
remote I/O
station initial
communications
status
OFF : No communications
ON : Communications
underway
Depends on the results of initial communication between a
local or remote I/O station and the master station.
M9237 SM1237
Local station,
remote I/O
station error
OFF : Normal
ON : Abnormal
Depends on the error condition of a local or remote I/O
station.
M9238 SM1238
Local station,
remote I/O
station forward or
reverse loop error
OFF : Normal
ON : Abnormal
Depends on the error condition of the forward and reverse
loop lines of a local or a remote I/O station.
M9240 SM1240
Link status
OFF : Online
ON : Offline, station-to-
stationtest, 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 SM1241
Forward loop line
error
OFF : Normal
ON : Abnormal
Depends on the error condition of the forward loop line.
M9242 SM1242
Reverse loop line
error
OFF : Normal
ON : Abnormal
Depends on the error condition of the reverse loop line.
M9243 SM1243
Loopback
implementation
OFF : Loopback not being
conducted
ON : Loopback implementation
Depends on whether or not loopback is occurring at the
local station.
M9246 SM1246
Data not received
OFF : Reception
ON : No reception
Depends on whether or not data has been received from
the master station.
M9247 SM1247
Data not received
OFF : Reception
ON : No reception
Depends on whether or not a tier three station has
received data from its master station in a three-tier system.
M9250 SM1250
Parameters not
received
OFF : Reception
ON : No reception
Depends on whether or not link parameters have been
received from the master station.
M9251 SM1251
Link relay
OFF : Normal
ON : Abnormal
Depands on the data link condition at the local station.
M9252 SM1252
Loop test status
OFF : Not being executed
ON : Forward or reverse loop
test execution underway
Depends on whether or not the local station is executing a
forward or a reverse loop test.
M9253 SM1253
Master station
operation status
OFF : RUN or STEP RUN
status
ON : STOP or PAUSE status
Depends on whether or not the master station is in STOP
or PAUSE mode.
M9254 SM1254
Local station
other than host
station operation
status
OFF : RUN or STEP RUN
status
ON : STOP or PAUSE status
Depends on whether or not a local station other than the
host is in STOP or PAUSE mode.
M9255 SM1255
Local station
other than host
station error
OFF : Normal
ON : Abnormal
Depends on whether or not a local station other than the
host is in error.
QnA