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APPENDICES
A
Appendix 3 Special Relay (SM) for MELSECNET/H (MELSECNET/10 Mode) Remote I/O Station
Do not change the values of special relay set by system using a program or by test operation. Doing so may result in system
down or communication failure.
(1) Diagnostic information
No. Name Meaning Explanation
Set by
(When Set)
Corresponding
ACPU
M9
Corresponding
CPU
SM0
Diagnostic
errors
OFF: No error
ON: Error
• This relay turns on if an error is detected by
diagnostics. (Also turns on if an error is
detected by an annunciator or the CHK
instruction.)
• This relay remains on even after the system
returns to normal.
S
(Error)
New
QnA
Qn(H)
QnPH
QnPRH
Rem
• This relay turns on if an error is detected by
diagnostics. (Also turns on if an error is
detected by an annunciator.)
• This relay remains on even after the system
returns to normal.
Q00J/
Q00/Q01
QnU
SM1
Self-
diagnostic
error
OFF: No error
ON: Error
• This relay turns on if an error is detected by
self-diagnostics. (Remains off if an error is
detected by an annunciator or the CHK
instruction.)
• This relay remains on even after the system
returns to normal.
M9008
QnA
Qn(H)
QnPH
QnPRH
Rem
• This relay turns on if an error is detected by
self-diagnostics. (Remains off if an error is
detected by an annunciator.)
• This relay remains on even after the system
returns to normal.
New
Q00J/
Q00/Q01
QnU
SM5
Error common
information
OFF: No error
common
information
ON: Error common
information
This relay turns on if error common information
data exists when SM0 turns on.
Rem
SM16
Error
individual
information
OFF: No error
individual
information
ON: Error
individual
information
This relay turns on if error individual
information data exists when SM0 turns on.
SM50 Error reset
OFFON:
Error reset
Conducts error reset operation. U
SM60
Blown fuse
detection
OFF: Normal
ON: Module with
blown fuse
• This relay turns on if there is at least one
output module whose fuse has blown.
• This relay remains on even after the system
returns to normal. Output modules on
remote I/O stations are also checked.
S
(Error)
M9000
SM61
I/O module
verify error
OFF: Normal
ON: Error
• This relay turns on if the status of the I/O
module differs from that registered at power-
on.
• This relay remains on even after the system
returns to normal.
• I/O modules on remote I/O stations are also
checked.
M90
02
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