Program Comparisons; Comparison Of Special Relays M (Sb) And Special Registers D (Sw) - Mitsubishi Electric MELSEC-A Series Manual

2
REPLACEMENT OF MELSECNET (II) AND /B (PLC TO PLC NETWORK)

2.6 Program Comparisons

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.
Special relay in the case of MELSECNET (II)
master station
Number Name
LRDP instruction
M9200
received
LRDP instruction
M9201
complete
LWTP instruction
M9202
received
LWTP instruction
M9203
complete
Link parameter
M9206
error in the host
Link parameter
M9207
check results
Master station B,W
transmission range
M9208
setting (only master
station of lower link)
Check instructions
of link parameters
M9209
(only master station
of lower link)
Link card error (for
M9210
master station)
M9224 Link status
M9225 Forward loop error
2
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Description Number
OFF : Not accepted
None
ON : Accepted
OFF : Not completed
None
ON : Completed
OFF : Not accepted
None
ON : Accepted
OFF : Not completed
None
ON : Completed
OFF : Normal
SB0055
ON : Abnormal
OFF : Match
None
ON : Mismatch
OFF : Transmits to
tier2 and tier3
None
ON : Transmits to
tier2 only
OFF : Executing the
check function
None
ON : Check non-
execution
OFF : Normal
SB0020
ON : Abnormal
OFF : Online
ON : Offline, station-
to-station test, SB0043
or self-loopback
test
SB0090
OFF : Normal
ON : Abnormal
SB0092
(when host
station is
remote
master
station)
: Compatible,
Corresponding MELSECNET/H special relay
Name Description
- -
- -
- -
- -
OFF : Parameter
Receive parameter normal
error ON : Parameter
abnormal
- -
- -
- -
OFF : Normal
Module status
ON : Abnormal
OFF : Online
Online switch ON : Other than
online
OFF : Normal
Host loop status
ON : Abnormal
Forward loop status
OFF : Normal
of the remote
ON : Abnormal
master station
: Partial change required, × : Incompatible
Compat- Precautions for
ibility replacement
Delete when used in a
sequence program.
(Refer to Section 2.6.2
Transient instructions.)
Delete when used in a
sequence program.
(Refer to Section 2.6.2
Transient instructions.)
Delete when used in a
sequence program.
(Refer to Section 2.6.2
Transient instructions.)
Delete when used in a
sequence program.
(Refer to Section 2.6.2
Transient instructions.)
Delete when used in a
sequence program as a
3-tier system cannot be
configured.
Delete when used in a
sequence program as a
3-tier system cannot be
configured.
Delete when used in a
sequence program as a
3-tier system cannot be
configured.
When ON, confirm the
loop status by SW0090.
The loop status can
also be judged by the
host station bits of
SW0091 to SW0094.
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