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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
SM322
SFC program
start status
OFF : Initial start
ON : Restart
• Initial value is set at ON or OFF depending on
parameters.
• When this relay is OFF, all execution status are cleared
from time SFC program was stopped; starts from the
initial step of block where the start request was made.
• When this relay is ON, starts from execution block and
execution step active at time SFC program was stopped.
(ON is enabled only when resumptive start has been
designated at parameters.)
• SM902 is not automatically designated for latch.
S (Initial)
U
M9102
format change
SM323
Presence/absenc
e of continuous
transition for
entire block
OFF : Continuous transition
not effective
ON : Continuous transition
effective
• When this relay is OFF, transition occurs at one scan/one
step, for all blocks.
• When this relay is ON, transition occurs continuously for
all blocks in one scan.
• In designation of individual blocks, priority is given to the
continuous transition bit of the block.
(Designation is checked when block starts.)
U M9103
SM324
Continuous
transition
prevention flag
OFF : When transition is
executed
ON : When no transition
• When continuous transition is effective, goes ON when
continuous transition is not being executed; goes OFF
when continuous transition is being executed.
• Normally ON when continuous transition is not effective.
S
(Instruction
execution)
M9104
SM325
Output mode at
block stop
OFF : OFF
ON : Preserves
When block stops, selects active step operation output.
• All coil outputs go OFF when this relay is OFF.
• Coil outputs are preserved when this relay is ON.
S (Initial)
U
M9196
SM326
SFC device clear
mode
OFF : Clear device
ON : Preserves device
Selects the device status when the stopped CPU is run
after the sequence program or SFC program has been
modified when the SFC program exists.
U New
SM327
Output during
end step
execution
OFF : OFF
ON : Preserves
Selects the output action of the step being held when a
block is ended by executing the end step.
• All coil outputs go OFF when this relay is OFF.
• Coil outputs are preserved when this relay is ON.
S (Initial)
U
New
SM330
Operation mode
for low speed
execution type
program
OFF : Asynchronous mode
ON : Synchronous mode
Low speed execution type program ON for 1 scan only
after RUN
U (END) New
SM390
Access execution
flag
When ON, access to the
intelligent function module is
completed
• Stores the status of the intelligent function module access
instruction executed immediately before.
(This information will be overwritten when the intelligent
function module access instruction is executed again.)
• This flag is used by the user in a program as the
completion bit.
S (Status
change)
New QCPU