Mitsubishi Electric Melsec A Series - 2.6.1 Comparison of special relays M (SB) and special registers D (SW)

REPLACEMENT OF MELSECNET (II) AND /B (PLC TO PLC NETWORK)
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2.6.1 Comparison of special relays M (SB) and special registers D (SW)
(1) Master station special relays
Special relays enabled when host station is the master station.
: Compatible, : Partial change required, × : Incompatible
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2.6 Program Comparisons
Special relay in the case of MELSECNET (II)
master station
Corresponding MELSECNET/H special relay
Number Name Description Number Name Description
Compat-
ibility
Precautions for
replacement
M9200
LRDP instruction
received
OFF : Not accepted
ON : Accepted
None - -
Delete when used in a
sequence program.
(Refer to Section 2.6.2
Transient instructions.)
M9201
LRDP instruction
complete
OFF : Not completed
ON : Completed
None - -
Delete when used in a
sequence program.
(Refer to Section 2.6.2
Transient instructions.)
M9202
LWTP instruction
received
OFF : Not accepted
ON : Accepted
None - -
Delete when used in a
sequence program.
(Refer to Section 2.6.2
Transient instructions.)
M9203
LWTP instruction
complete
OFF : Not completed
ON : Completed
None - -
Delete when used in a
sequence program.
(Refer to Section 2.6.2
Transient instructions.)
M9206
Link parameter
error in the host
OFF : Normal
ON : Abnormal
SB0055
Receive parameter
error
OFF : Parameter
normal
ON : Parameter
abnormal
M9207
Link parameter
check results
OFF : Match
ON : Mismatch
None - -
Delete when used in a
sequence program as a
3-tier system cannot be
configured.
M9208
Master station B,W
transmission range
setting (only master
station of lower link)
OFF : Transmits to
tier2 and tier3
ON : Transmits to
tier2 only
None - -
Delete when used in a
sequence program as a
3-tier system cannot be
configured.
M9209
Check instructions
of link parameters
(only master station
of lower link)
OFF : Executing the
check function
ON : Check non-
execution
None - -
Delete when used in a
sequence program as a
3-tier system cannot be
configured.
M9210
Link card error (for
master station)
OFF : Normal
ON : Abnormal
SB0020 Module status
OFF : Normal
ON : Abnormal
M9224 Link status
OFF : Online
ON : Offline, station-
to-station test,
or self-loopback
test
SB0043 Online switch
OFF : Online
ON : Other than
online
M9225 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.
SB0092
(when host
station is
remote
master
station)
Forward loop status
of the remote
master station
OFF : Normal
ON : Abnormal