Mitsubishi MELSEC-A Series Reference Manual page 266

9. PROGRAMMING
Device
Name
Number
LRDP execution
D9200
result
LWTP execution
D9201
result
D9202
Local station link
type
D9203
D9204 Link status
Table 9.6 List of MELSECNET/B special link registers
Data
0 : Normal
2 : LRDP instruction setting
fault
3 : Corresponding station
error
4 : LRDP can be executed in
the corresponding station
0 : Normal
2 : LWTP instruction setting
fault
3 : Corresponding station
error
4 : LWTP cannot be
executed in the
corresponding station
Stores the status of
No.1 to No.16
Stores the status of
No.17 to No.31
0 : Data link
5 : Data link impossible
9 - 20
Description
Stores the execution result of an LRDP (word device read)
instruction (M9201 ON).
• LRDP instruction setting
fault: ...................................... Faulty setting of the LRDP
• Corresponding station error: . The designated station is not
• LRDP cannot be executed in
the corresponding station:..... As the station designated with the
Stores the execution result of an LWTP (word device write)
instruction (M9203 ON).
• LWTP instruction setting
fault: ...................................... Faulty setting of the LWTP
• Corresponding station error: . The designated station is not
• LWTP cannot be executed in
the corresponding station:..... As the station designated with the
Stores whether a slave station is compatible with the MELSECNET
mode or MELSECNET mode.
• MELSECNET -compatible station : "1"
• MELSECNET-compatible station : "0"
Stores the current path of the data link.
(1) Forward loop
• "5" is stored because the watchdog timer setting is too small.
• The data in D9204 is updated each time the link status changes.
instruction constant, source, and/or
target
executing data link processing
LRDP instruction, a remote I/O
station is connected. Or the local
station for the QCPU specified by
the LRDP instruction is in STOP
status.
instruction constant, source, and/or
target
executing data link processing
LWTP instruction, a remote I/O
station is connected. Or the local
station for the QCPU specified by
the LWTP instruction is in STOP
status.