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MELSEC-Q
APPENDICES
(1) Diagnostic information
Special Relay List
Number 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.
S (Error) New
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.
S (Error) 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.
S (Error) 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.
S (Error) New
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.
S (Error) New
SM50 Error reset
OFF
ON : Error reset
• Conducts error reset operation. U New
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
Rem
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.
S (Error) M9002
(2) System information
Special Relay List
Number Name Meaning Explanation
Set by
(When Set)
Corresponding
ACPU
M9
Corresponding
CPU
SM206
PAUSE enable
coil
OFF : PAUSE disabled
ON : PAUSE enabled
• The status changes to PAUSE if this relay is on when the
PAUSE contact turns on.
U M9040
Device test
request
acceptance
status
OFF : Test not executed
ON : Test executed
• This relay turns on when inputs/outputs are forcibly
registered by GX Developer.
S (Request) New Remote
SM213
Clock data read
request
OFF : Ignored
ON : Read request
• This relay is turned on to read clock data and store them
as BCD values into SD210 to SD213.
U M9028
Rem
SM250
Max. loaded I/O
read
OFF : Ignored
ON : Read
• When this relay turns on, the largest I/O number among
those of the mounted modules is read into SD250.
U New
QnA
Qn(H)
QnPH
QnPRH
Rem
SM280 CC-Link error
OFF : Normal
ON : Error
• Turns on if a CC-Link error is detected in any of the CC-
Link modules mounted. Turns off when the condition
returns to normal.
S (Status
change)
New
Qn(H)
QnPH
QnPRH
Rem
• Turns on if a CC-Link error is detected in any of the CC-
Link modules mounted. Remains on even after the
condition returns to normal.
S (Error) New QnA