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MELSEC-Q
11 TROUBLESHOOTING
Special Relay List (Continued)
Number
Name
Meaning
Explanation
Set by
(When Set)
Corresponding
ACPU
M9
Applicable
CPU
SM806
Status latch
preparation
OFF : Not ready
ON : Ready
• Goes ON when status latch is ready
S (Status
change)
New
SM807
Status latch
command
OFF
ON: Latch
• Runs status latch command U New
SM808
Status latch
completion
OFF : Latch not completed
ON : Latch completed
• Comes ON when status latch is completed.
S (Status
change)
9055
SM809 Status latch clear
OFF
ON: Clear
• Enable next status latch U New
QnA
SM810
Program trace
preparation
OFF : Not ready
ON : Ready
• Goes ON when program trace is ready
S (Status
change)
New
SM811
Start program
trace
OFF : Suspend
ON : Start
• Program trace started when this goes ON
• Suspended when OFF (Related special M all OFF)
S (Status
change)
New
SM812
Program trace
execution under
way
OFF : Suspend
ON : Start
• ON when program trace execution is underway U New
SM813
Program trace
trigger
OFF
ON: Start
• Program trace trigger goes ON when this goes from OFF
to ON (Identical to PTRA instruction execution status)
S (Status
change)
New
SM814
After program
trace trigger
OFF : Not after trigger
ON : After trigger
• Goes ON after program trace trigger
S (Status
change)
New
SM815
Program trace
completion
OFF : Not completed
ON : End
• Goes ON at completion of program trace
S (Status
change)
New
QnA
SM820
Step trace
preparation
OFF : Not ready
ON : Ready
• Goes ON after program trace registration, at ready.
U New
SM821 Step trace starts
OFF : Suspend
ON : Start
• When this goes ON, step trace is started
• Suspended when OFF (Related special M all OFF)
S (Status
change)
M9182 format
change
SM822
Step trace
execution
underway
OFF : Suspend
ON : Start
• Goes ON when step trace execution is underway
• Goes OFF at completion or suspension
S (Status
change)
M9181
SM823
After step trace
trigger
OFF : Not after trigger
ON : Is after first trigger
• Goes ON if even 1 block within the step trace being
executed is triggered.
• Goes OFF when step trace is commenced.
S (Status
change)
New
SM824
After Step trace
trigger
OFF : Is not after all triggers
ON : Is after all triggers
• Goes ON if all blocks within the step trace being
executed are triggered.
• Goes OFF when step trace is commenced.
S (Status
change)
New
SM825
Step
tracecompleted
OFF : Not completed
ON : End
• Goes ON at step trace completion.
• Goes OFF when step trace is commenced.
S (Status
change)
M9180
Trace error • Switches ON if error occurs during execution of trace.
S (Status
change)
New QCPU
SM826
Sampling trace
error
OFF : Normal
ON : Errors
• Goes ON if error occurs during execution of sampling
trace.
S (Status
change)
New
SM827 Status latch error
OFF : Normal
ON : Errors
• Goes ON if error occurs during execution of status latch.
S (Status
change)
New
SM828
Program trace
error
OFF : Normal
ON : Errors
• Goes ON if error occurs during execution of program
trace.
S (Status
change)
New
QnA
(8) Latch area
Number
Name
Meaning
Explanation
Set by
(When Set)
Corresponding
ACPU
M9
Applicable
CPU
SM900 Power cut file
OFF : No power cut file
ON : Power cut file present
• Goes ON if a file is present during access when power is
interrupted.
S/U (Status
change)
New QnA
SM910
RKEY
registration flag
OFF : Keyboard input
notregistered
ON : Keyboard input
registered
• Goes ON at registration of keyboard input.
OFF if keyboard input is not registered.
S
(Instruction
execution)
New