Mitsubishi MELSEC-Q Series Programming Manual page 57

3 SPECIFICATIONS
(2) Number of steps required for expressing the SFC diagram as SFC dedicated instructions
The following table shows the number of steps required for expressing the SFC diagram as
SFC dedicated instructions.
Name
SFCP START
[SFCP]
instruction
SFCP END instruction [SFCPEND]
Block START
[BLOCK BLm]
instruction
Block END instruction [BEND]
Step START
[STEP
instruction
Transition START
[TRAN
instruction
Coupling check
[TAND Si]
instruction
Transition designation
[TSET Si]
instruction
Step END instruction [SEND]
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Ladder Number of
Expression Steps
1
1
1
1
Si] 2
TRj] 2
2
2
1
Description
Indicates the SFC program
START
Indicates the SFC program
END
Indicates the block START
Indicates the block END
Indicates the step START
(" " varies according to
the step attribute)
Indicates the transition
START (" " varies
according to the step
attribute)
"Coupling completed" check
occurs at parallel coupling
Designates the transition
destination step
Indicates the step / transition
END
Required Number of Steps
1 per program
1 per program
1 per block
1 per block
1 per step
1 per transition condition
"[Number of parallel couplings] - [1]"
per parallel coupling
For serial transitions and selection
transitions, 1 per transition condition;
for parallel branching transitions, the
number of steps is the same as the
number of parallel couplings
1 per step
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