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MELSEC-Q
11 TROUBLESHOOTING
Special Relay List
(2) System information
Number
Name
Meaning
Explanation
Set by
(When Set)
Corresponding
ACPU
M9
Applicable
CPU
SM202
LED OFF
command
OFF
ON : LED OFF
• When this relay goes from OFF to ON, the LEDs
corresponding to the individual bits at SD202 go off
U New
SM203 STOP contact STOP status • Goes ON at STOP status
S (Status
change)
M9042
SM204 PAUSE contact PAUSE status • Goes ON at PAUSE status
S (Status
change)
M9041
SM205
STEP-RUN
contact
STEP-RUN status • Goes ON at STEP-RUN status
S (Status
change)
M9054
PAUSE enable
coil
OFF : PAUSE disabled
ON : PAUSE enabled
• PAUSE status is entered if this relay is ON when the
remote PAUSE contact goes ON
U M9040
SM206
Device test
request
acceptance
status
OFF : Device test not yet
executed
ON : Device test executed
• Comes ON when the device test mode is executed on
GX Developer.
S (Request) New Remote
SM210
Clock data set
request
OFF : Ignored
ON : Set request
• When this relay goes from OFF to ON, clock data being
stored from SD210 to SD213 after execution of END
instruction for changed scan is written to the clock device.
U M9025
SM211 Clock data error
OFF : No error
ON : Error
• ON when error is generated in clock data (SD210 to
SD213) value, and OFF if no error is detected.
S (Request) M9026
SM212
Clock data
display
OFF : Ignored
ON : Display
• Displays clock data as month, day, hour, minute, and
second at the LED display at front of CPU module.
U M9027
Q3A
Q4A
Q4AR
SM213
Clock data read
request
OFF : Ignored
ON : Read request
• When this relay is ON, clock data is read to SD210 to
SD213 as BCD values.
U M9028
+Rem
SM240
No. 1 CPU reset
flag
OFF : PLC No. 1 reset cancel
ON : PLC No. 1 resetting
• Goes OFF when reset of the PLC No. 1 is canceled.
• Comes ON when the PLC No. 1 is resetting (including
the case where the PLC is removed from the base unit).
The other PLCs are also put in reset status.
SM241
No. 2 CPU reset
flag
OFF : PLC No. 2 reset cancel
ON : PLC No. 2 resetting
• Goes OFF when reset of the PLC No. 2 is canceled.
• Comes ON when the PLC No. 2 is resetting (including
the case where the PLC is removed from the base unit).
The other PLCs result in "MULTI CPU DOWN" (error
code: 7000).
SM242
No. 3 CPU reset
flag
OFF : PLC No. 3 reset cancel
ON : PLC No. 3 resetting
• Goes OFF when reset of the PLC No. 3 is canceled.
• Comes ON when the PLC No. 3 is resetting (including
the case where the PLC is removed from the base unit).
The other PLCs result in "MULTI CPU DOWN" (error
code: 7000).
SM243
No. 4 CPU reset
flag
OFF : PLC No. 4 reset cancel
ON : PLC No. 4 resetting
• Goes OFF when reset of the PLC No. 4 is canceled.
• Comes ON when the PLC No. 4 is resetting (including
the case where the PLC is removed from the base unit).
The other PLCs result in "MULTI CPU DOWN" (error
code: 7000).
SM244
No. 1 CPU error
flag
OFF : PLC No. 1 normal
ON : PLC No. 1 during stop
error
• Goes OFF when the PLC No. 1 is normal (including a
continuation error).
• Comes ON when the PLC No. 1 is during a stop error.
SM245
No. 2 CPU error
flag
OFF : PLC No. 2 normal
ON : PLC No. 2 during stop
error
• Goes OFF when the PLC No. 2 is normal (including a
continuation error).
• Comes ON when the PLC No. 2 is during a stop error.
SM246
No. 3 CPU error
flag
OFF : PLC No. 3 normal
ON : PLC No. 3 during stop
error
• Goes OFF when the PLC No. 3 is normal (including a
continuation error).
• Comes ON when the PLC No. 3 is during a stop error.
SM247
No. 4 CPU error
flag
OFF : PLC No. 4 normal
ON : PLC No. 4 during stop
error
• Goes OFF when the PLC No. 4 is normal (including a
continuation error).
• Comes ON when the PLC No. 4 is during a stop error.
S (Status
change)
New
QCPU
function
Ver. B