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MELSEC-Q

11 TROUBLESHOOTING

Special Relay List

(2) System information

Number

Name

Meaning

Explanation

Set by

(When Set)

Corresponding

ACPU

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