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MELSEC-Q
11 TROUBLESHOOTING
Special Relay List
(1) Diagnostic Information
Number
Name
Meaning
Explanation
Set by
(When Set)
Corresponding
ACPU
M9
Applicable
CPU
SM0 Diagnostic errors
OFF : No error
ON : Error
• ON if diagnosis results show error occurrence
(Includes when an annunciator is ON, and when an error
is detected with CHK instruction)
• Stays ON subsequently even if normal operations
restored
S (Error) New
SM1
Self-diagnosis
error
OFF : No self-diagnosis
errors
ON : Self-diagnosis
• Comes ON when an error occurs as a result of self-
diagnosis. (Does not include when annunciator is ON or
when error is detected by CHK instruction.)
• Stays ON subsequently even if normal operations
restored
S (Error) M9008
SM5
Error common
information
OFF : No error common
information
ON : Error common
information
• When SM0 is ON, ON if there is error common
information
S (Error) New
SM16
Error individual
information
OFF : No error common
information
ON : Error common
information
• When SM0 is ON, ON if there is error individual
information
S (Error) New
SM50 Error reset
OFF
ON : Error reset
• Conducts error reset operation U New
+Rem
SM51 Battery low latch
OFF : Normal
ON : Battery low
• ON if battery voltage at CPU module or memory card
drops below rated value. Stays ON subsequently even
after normal operation is restored
• Synchronous with BAT. ALA/BAT. LED
S (Error) M9007
SM52 Battery low
OFF : Normal
ON : Battery low
• Same as SM51, but goes OFF subsequently when
battery voltage returns to normal.
S (Error) M9006
• Comes ON it a momentary power interruption of less
than 20ms occurred during use of the AC power supply
module, and reset by turning the power OFF, then ON.
• Comes ON if a momentary power interruption of less
than 10ms occurred during use of the DC power supply
module, and reset by turning power OFF, then ON.
QCPU
SM53
AC/DC DOWN
detection
OFF : AC/DC DOWN not
detected
ON : AC/DC DOWN
detected
• Comes ON if a momentary power interruption of less
than 1ms occurred during use of the DC power supply
module, and reset by turning power OFF, then ON.
S (Error) M9005
QnA
SM54 MINI link errors
OFF : Normal
ON : Error
• Goes ON if MINI (S3) link error is detected at even one of
the installed MELSECNET/MINI master modules.
Stays ON subsequently even after normal operation is
restored.
S (Error) M9004 QnA
SM56 Operation Errors
OFF : Normal
ON : Operation error
• ON when operation error is generated
• Stays ON subsequently even if normal operations
restored
S (Error) M9011
SM60
Blown fuse
detection
OFF : Normal
ON : Module with blown fuse
• Comes ON even if there is only one output module with a
blown fuse, and remains ON even after return to normal
• Blown fuse status is checked even for remote I/O station
output modules.
S (Error) M9000
SM61
I/O module
verification error
OFF : Normal
ON : Error
• Comes ON if there is a discrepancy between the actual
I/O modules and the registered information when the
power is turned on
• I/O module verification is also conducted for remote I/O
station modules.
S (Error) M9002
+Rem
SM62
Annunciator
detection
OFF : Not detected
ON : Detected
• Goes ON if even one annunciator F goes ON.
S
(Instruction
execution)
M9009
SM80 CHK detection
OFF : Not detected
ON : Detected
• Goes ON if error is detected by CHK instruction.
• Stays ON subsequently even after normal operation is
restored.
S
(Instruction
execution)
New
SM90 Corresponds to SD90 M9108
SM91 Corresponds to SD91 M9109
SM92 Corresponds to SD92 M9110
SM93 Corresponds to SD93 M9111
SM94 Corresponds to SD94 M9112
SM95 Corresponds to SD95 M9113
SM96 Corresponds to SD96 M9114
SM97 Corresponds to SD97 New
SM98 Corresponds to SD98 New
SM99
Startup of
watchdog timer
for step transition
(Enabled only
when SFC
program exists)
OFF : Not started
(watchdog timer reset)
ON : Started
(watchdog timer
started)
Corresponds to SD99
• Goes ON when measurement of
step transition watchdog timer is
commenced.
• Resets watchdog timer when it
goes OFF.
U
New