Mitsubishi Electric Melsec A Series - Transient Instructions

REPLACEMENT OF MELSECNET (II) AND /B (PLC TO PLC NETWORK)
2 - 65
2
(2) Local station special relay
Special relays enabled when host station is the local station.
: Compatible, : Partial change required, × : Incompatible
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Special relay in the case of MELSECNET (II) local
station
MELSECNET/H special relay
Number Name Description Number Name Description
Compat-
ibility
Precautions for
replacement
M9204
LRDP instruction
complete
OFF : Not completed
ON : Completed
None - -
Delete when used in a
sequence program.
(Refer to Section 2.6.2
Transient instructions.)
M9205
LWTP instruction
complete
OFF : Not completed
ON : Completed
None - -
Delete when used in a
sequence program.
(Refer to Section 2.6.2
Transient instructions.)
M9211
Link card error (for
local station)
OFF : Normal
ON : Abnormal
SB0020 Module status
OFF : Normal
ON : Abnormal
M9240 Link status
OFF : Online
ON : Offline, station-
to-station test,
or self-loopback
test
SB0043 Online switch
OFF : Online
ON : Other than
online
M9241 Forward loop error
OFF : Normal
ON : Abnormal
SB0090 Host loop status
OFF : Normal
ON : Abnormal
When ON, confirm the
loop status by SW0090.
The loop status can
also be judged by the
host station bits of
SW0091 to SW0094.
M9242 Reverse loop error
OFF : Normal
ON : Abnormal
SB0090 Host loop status
OFF : Normal
ON : Abnormal
When ON, confirm the
loop status by SW0090.
The loop status can
also be judged by the
host station bits of
SW0095 to SW0098.
M9243
Loopback
execution
OFF : Loopback not
executed
ON : Loopback
execution
SB0090 Host loop status
OFF : Normal
ON : Abnormal
When ON, confirm the
loop status by SW0090.
The loop status can
also be judged by
whether SW0099 and
SW009A are the host
station No.
M9246
Data not received
from master station
OFF : Received
ON : Not received
None - -
Delete when used in a
sequence program as a
3-tier system cannot be
configured.
M9247
Data not received
from the upper loop
in 3-tier system
OFF : Received
ON : Not received
None - -
Delete when used in a
sequence program as a
3-tier system cannot be
configured.
M9250
Parameter
unreceived
OFF : Received
ON : Not received
SB0054
Parameter receive
status
OFF : Receive
completed
ON : Not received
M9251 Link break
OFF : Normal
ON : Cancel
SB0049
Host station data
link status
OFF : Normal
ON : Abnormal
M9252 Loop test status
OFF : Not being
executed
ON : Forward loop
test/reverse
loop test
execution
underway
SB00AE
Offline testing
response
designation
OFF : No response
ON : Response