Mitsubishi Electric MELSEC-A Series Manual page 136

3
REPLACEMENT OF MELSECNET (II) AND /B (REMOTE I/O NETWORK)
Special relay in the case of MELSECNET (II)
master station
Number Name
M9226 Reverse loop error
M9227 Loop test status
Local station
M9232
operation status
Local station error
M9233
detection status
Local station,
remote I/O station
M9235
parameter error
detection status
Local station,
remote I/O station
M9236 initial
communications
status
Local station,
M9237 remote I/O station
error
Local station,
remote I/O station
M9238
forward/reverse
loop error
3
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Description Number
SB0090
OFF : Normal
ON : Abnormal
SB0096
(when host
station is
remote
master
station)
OFF : Not being
executed
ON : Forward loop
test/reverse SB00AC
loop test
execution
underway
OFF : RUN or STEP
RUN status
SB0084
ON : STOP or PAUSE
status
OFF : No error
None
ON : Error detection
OFF : No error
SB007C
ON : Error detection
OFF : No
communication
SB0078
ON : Communication
in progress
OFF : Normal
SB0074
ON : Abnormal
SB0091
OFF : Normal
ON : Abnormal
SB0095
: Compatible,
Corresponding MELSECNET/H special relay
Name Description
OFF : Normal
Host loop status
ON : Abnormal
Reverse loop
OFF : Normal
status of the remote
ON : Abnormal
master station
Offline test OFF : Not instructed
instruction status ON : Instructed
OFF : All stations
RUN or STEP
RUN status
Each station CPU
ON : Stations in the
RUN status
STOP or
PAUSE status
exist
- -
OFF : No station
detected
parameter
Parameter status of errors
each station ON : A station
detected
parameter
errors
OFF : Parameter
communication
Parameter status of not in progress
each station ON : Parameter
communication
in progress
OFF : All stations
normal
Cyclic transmission ON : Station where
status of each cyclic
station transmission is
not executing
exist
OFF : All stations
normal
Forward loop status
ON : Faulty station
present
OFF : All stations
Reverse loop normal
status ON : Faulty station
present
: Partial change required, × : Incompatible
Compat- Precautions for
ibility replacement
When ON, confirm the
loop status by SW0090.
The loop status can
also be judged by the
host station bits of
SW0095 to SW0098.
Can be substituted by
SB0074.